Re: Simple things should be simple
On Fri, 10 Sep 2010 01:08:06 -0400 John Newman john...@gmail.com wrote: (use '[clojure.contrib.server-socket :only (create-server)] '[clojure.contrib.duck-streams :only (read-lines)]) (create-server 8080 (fn [in out] (when-not (empty? (read-lines in)) (spit out Hello, World!\n 4/0/0 Nah, 4/0/1 - I count the implementation language as a tool in every case. Unless you forgot the clj script and the #!/usr/bin/env clj line, so it's 5/0/2. Believe it or not, on at least one occasion I've put things on that level into production on the public internet. It met the requirements, including scalability for any foreseeable growth. I think that Java's strength is enterprise-level, highly scalable web servers make people assume that every problem must be a nail for that hammer. The thing is, out here in the real world, the vast majority of web-based applications have no need to be highly scalable. Sure, if you put an app on the public internet, you ought to be prepared for it to go viral and have a plan for serious scalability. But most web applications aren't on the public internet. Look around your own office - or even your own house. How many lan-only web serves do you have? They're never going to scale beyond the size of your company. I've got about six such running here (two for real services, two for development, and two for doing test builds on the deployment platform). And calibre, which runs a web server to transfer ebooks from my library to ebook readers. If you count the not-http-apache modules I'm working on, and the servers that speak that protocol, that adds another half dozen. Apps running on those don't need to be highly scalable, so why should someone deploying to them have to deal with such cruft? Now look for any kind of network appliance: routers, printers, NAS boxes, who knows what else. Chances are they have a web server embedded in them somewhere. There's no good reason for them to need to deal with two simultaneous connection, but most use an open source server that's a bit better than that. I've got at least five of those on my LAN, and I'd be surprised if the cable modem doesn't run one. They only way they'll get the kind of traffic that would require scalability is if someone DDoS's them. Further, they tend to run on boxes with very limited resources, so not only do they not need the overhead for scalability, but providing it is liable to make a noticeable impact on system performance elsewhere. Finally, for a real kicker, up through iPhone OS 3, Apple failed to provide a standard method to move data between the iPhone and desktop applications. So applications that wanted to do that tended to run a web server for the purpose (except for one oddball app that ran an ftp server). I had three or four of those before I switched to Android. Since Android lets apps write to disk that can be mounted via USB on your desktop, most do that - but I wouldn't be surprised if there was at least one web server lurking in the system somewhere. Even more limited resources, and slower CPUs thanks to the battery issues. And before you complain that Java's not appropriate for that environment, consider Java ME and Dalvik. Nah, web servers that simply don't need to be scalable far out number those that do. The only question is whether the curve is a bell curve or an inverse logarithm, but in either case things that need to be highly scalable web servers are out under the tail of the curve. The fast majority of web servers don't need that, they just need a simple way to get the code running. Which is why simple things should be simple is important - there are a lot more of them than there are of the others. mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail - www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Macro problems with delay
On 10 Sep 2010, at 03:11, joshua-choi wrote: And here is a full macro-expansion of the call at which the error happens: http://gist.github.com/572879 If I understand the comment (the following form is the culprit...) correctly, it's not the macroexpansion that fails, but the evaluation of the resulting expression. Is that correct? In that case, it's not really a macro problem, but a problem with a complex use case of alter- var-root. Konrad. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Standalone 1.2 contrib
On Fri, Sep 10, 2010 at 12:09 AM, Stuart Sierra the.stuart.sie...@gmail.com wrote: Do we need a direct link to the JAR on the download page? That's easy enough. I think the easier the better for its adoption. If a single user has asked for it, I'd add it (even though others might consider what's available already as easy enough). Since it gonna be just a single link... :-) Jacek -- Jacek Laskowski Notatnik Projektanta Java EE - http://jaceklaskowski.pl -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: drop-while and (pred item) returns nil?
On Fri, Sep 10, 2010 at 1:08 AM, Alan a...@malloys.org wrote: I'm not 100% sure what you're asking, but I think I understand you, and in that case you can refer to http://groups.google.com/group/clojure/browse_thread/thread/9c7f726709e24c12/b2e2696b70d924f2?show_docid=b2e2696b70d924f2, in which I ask this very question and get the answers I am looking for. Hi Alan, That was my point exactly - the reference to nil in the docstring for drop-while. It's a bit confusing to me and I'd expect a boolean reference instead. Jacek -- Jacek Laskowski Notatnik Projektanta Java EE - http://jaceklaskowski.pl -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
Hi, On 9 Sep., 20:46, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: The first problem with that is that this stuff seems show up *everywhere* in Javaland. It's not just web apps, it's pretty much anything. You just lost me completely with your argumentation. I wrote a small desktop utility (simple problem, simple solution, simple program) which is distributed to different locations in the company. It works on Windows and Unix w/o adaption to the system. Download jar and double-click / execute via java -jar. It works without library version hell, complicated Makefiles, system differences and other shenanigans. I'm quite willing to pay more complexity upfront to have it easier in the end. It is obvious that Clojure doesn't fit your needs. Then simply don't use it. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Knowing in advance the complexity of count
Hi, On 9 Sep., 21:01, Randy Hudson randy_hud...@mac.com wrote: Inexplicably (counted? abcd) returns false. Why should it? String does not implement Counted. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: matching with wild-cards in clojure multi-methods
Hi, On 9 Sep., 21:47, Daniel Werner daniel.d.wer...@googlemail.com wrote: Could this be a bug? No. Clojure does not enforce contracts in several places. Feed wrong things in and get undefined behaviour back. Only the contract is guaranteed. Everything else is an implementation detail and might change at any moment. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
2010/9/10 Meikel Brandmeyer m...@kotka.de: Hi, On 9 Sep., 20:46, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: The first problem with that is that this stuff seems show up *everywhere* in Javaland. It's not just web apps, it's pretty much anything. You just lost me completely with your argumentation. I wrote a small desktop utility (simple problem, simple solution, simple program) which is distributed to different locations in the company. It works on Windows and Unix w/o adaption to the system. Download jar and double-click / execute via java -jar. It works without library version hell, complicated Makefiles, system differences and other shenanigans. I'm quite willing to pay more complexity upfront to have it easier in the end. It is obvious that Clojure doesn't fit your needs. Then simply don't use it. Meikel, while I admit I haven't read *all* the answers to Meikel's question in their entirety, what I've understood is that : * he's not talking about clojure the language, but its ecosystem (the JVM host and the J2EE stuff -de facto standard for webapps) = so I disagree with you, clojure *may* fit its needs * AFAIK the state of the art for clojure hosted on the JVM is not fixed, so I don't see why your advice to him is to not use it. All, Beware trying too hard to defend a position which is not defendable. Lee said it with probably less provocative terms than Mike, but Mike being a bit provocative doesn't mean Mike's point is wrong. And Mike's examples being a bit (ok maybe a lot) caricatural (is this the idiomatic english word for what I mean?) doesn't mean his point is invalid. These last few months, working on ccw has been particularly interesting because I've had feedback from users, especially Lee. Lee has challenged a lot of what I had considered to be simple things in ccw. I can say that when you're in a position of expert, it's hard to change your mind, because at first, you reject the new user's points as invalid. I think that I finally got some points, and have implemented them in ccw. I've learned something from this : the It's harder to do/design simple things than complex ones maxim is soo true. But what I also learned is that one point that makes it hard to follow the maxim is when you consider that you've reached the nirvana of simplicity for your system (either public interface or internals) and there's nothing more to do. Probably Apple with its iPhone is a popular example of great minds having been able to be the first in the market to offer interfaces simpler that what everybody else, used to classic user interface ergonomics, would have imagined possible. I guess a lot of people switch to clojure because they recognize in it that the simpler paradigm to start with with your program (functional programming), the better the program. By doing so they are recognizing that Java is not a good example of Simple things made simple. And the same problem Java the language has, the same problem all its ecosystem has (to some level, those are gross approximations, of course). What Matt told several posts above about conjure seem to be an interesting step towards simplicity, without affecting incremental addition of features/essential complexity to the growing program. Peace my friends, cheers, -- Laurent -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Knowing in advance the complexity of count
2010/9/10 Meikel Brandmeyer m...@kotka.de: Hi, On 9 Sep., 21:01, Randy Hudson randy_hud...@mac.com wrote: Inexplicably (counted? abcd) returns false. Why should it? String does not implement Counted. Maybe when Counted becomes a protocol and is then extended to java.lang.String ? (Does this make sense ?) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
Hi, On 10 Sep., 10:27, Laurent PETIT laurent.pe...@gmail.com wrote: while I admit I haven't read *all* the answers to Meikel's question in their entirety, what I've understood is that : * he's not talking about clojure the language, but its ecosystem (the JVM host and the J2EE stuff -de facto standard for webapps) = so I disagree with you, clojure *may* fit its needs I'm also not talking about clojure the language, but about the ecosystem. To deploy my simply (a detail, but since we are talking about Hello, World...) clojure (a detail, could written in groovy, scala, java, ...) program I used gradle (written in Groovy, useful for other JVM stuff), several maven repos and the JRE (part of the JVM environment). I just packed everything in jar distributed it around the world and it worked in a heterogeneous environment without further support. How much simpler can it get? What I actually wanted to point out: there is no simple. simple is highly subjective and talking about simple in absolute terms is a mistake. * AFAIK the state of the art for clojure hosted on the JVM is not fixed, so I don't see why your advice to him is to not use it. Because it obviously doesn't fit his needs. Mike wants a simple solution for simple problems. It seems that at the moment there is no JVM solution that is simple enough for Mike's context. So he shouldn't use Clojure. Or Groovy. Or Scala. Clojure being just a detail of his problem (Mike states several times, that he talks about the JVM environment not the language.) When things change and complexity is reduced for his context, Mike can re-evaluate the use of Clojure. And if the whole system fits the bill, he might even choose to use Clojure for future projects. Isn't that a reasonable approach? Beware trying too hard to defend a position which is not defendable. I'm not defending a lost position. There are other tools which fit Mike's needs better than clojure *at the moment*. So there is no point trying to convince him. That doesn't mean that we shouldn't change the situation and make things simpler (for some definition of simple). Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
2010/9/10 Meikel Brandmeyer m...@kotka.de: Hi, On 10 Sep., 10:27, Laurent PETIT laurent.pe...@gmail.com wrote: while I admit I haven't read *all* the answers to Meikel's question in their entirety, what I've understood is that : * he's not talking about clojure the language, but its ecosystem (the JVM host and the J2EE stuff -de facto standard for webapps) = so I disagree with you, clojure *may* fit its needs I'm also not talking about clojure the language, but about the ecosystem. To deploy my simply (a detail, but since we are talking about Hello, World...) clojure (a detail, could written in groovy, scala, java, ...) program I used gradle (written in Groovy, useful for other JVM stuff), several maven repos and the JRE (part of the JVM environment). I just packed everything in jar distributed it around the world and it worked in a heterogeneous environment without further support. How much simpler can it get? What I actually wanted to point out: there is no simple. simple is highly subjective and talking about simple in absolute terms is a mistake. * AFAIK the state of the art for clojure hosted on the JVM is not fixed, so I don't see why your advice to him is to not use it. Because it obviously doesn't fit his needs. Mike wants a simple solution for simple problems. It seems that at the moment there is no JVM solution that is simple enough for Mike's context. So he shouldn't use Clojure. Or Groovy. Or Scala. Clojure being just a detail of his problem (Mike states several times, that he talks about the JVM environment not the language.) When things change and complexity is reduced for his context, Mike can re-evaluate the use of Clojure. And if the whole system fits the bill, he might even choose to use Clojure for future projects. Isn't that a reasonable approach? Beware trying too hard to defend a position which is not defendable. I'm not defending a lost position. There are other tools which fit Mike's needs better than clojure *at the moment*. So there is no point trying to convince him. That doesn't mean that we shouldn't change the situation and make things simpler (for some definition of simple). That's what I wanted to read, 'cause the state of your previous answer seemed so negative ! :-) Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
[ANN] http.async.client v0.2.0
I'm happy to announce release of http.async.client v0.2.0 an Asynchronous HTTP Client for Clojure. This is wrapper/adapter on top of http://github.com/AsyncHttpClient/async-http-client Project: http://github.com/neotyk/http.async.client/ Documentation: http://neotyk.github.com/http.async.client/ API autodoc: http://neotyk.github.com/http.async.client/autodoc/ Changelog: http://github.com/neotyk/http.async.client/blob/master/changelog.org Simple usage: (ns sample (:require [http.async.client :as c])) (let [response (c/GET http://github.com/neotyk/http.async.client/;)] (c/await response) (c/string response)) Allows you to consume Twitter Streaming API with an ease: http://codemeself.blogspot.com/2010/09/asynchronous-http-client-for-clojure.html http://github.com/neotyk/http.async.client/raw/master/twitter-sample.clj Changes in this release: * HTTP Streams as clojure.core/seq * Cookies support * Authentication support (BASIC and DIGEST) * Proxy per request * Allowed branding User-Agent * Keyworded arguments in API I would love to hear from you what you think of this library, Hubert. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Some Problem with Recursion
@ Nicolas and ajuc Thank you very much for showing me where I went wrong! With so many parentheses it sometimes happens that I misplace one Now the output of the function is as expected: (defn prefix-postfix [expr] (if (coll? expr) (let [ [op arg1 arg2] expr] [ (prefix-postfix arg1) (prefix-postfix arg2) op]) ;; -- removed on parenthesis here expr)) (prefix-postfix '(+ 2 (* 3 2))) ;; -- [2 [3 2 *] +] There is just one point I still don't quite understand. That is, during one of the recursive calls, the expression (* 3 2) is passed as an argument to prefix-postfix: (prefix-postfix (* 3 2)) As prefix-postfix is a normal function and not a macro, (* 3 2) should get evaluated BEFORE being passed to the function. However, this is not the case here. Could it be that because (* 3 2) is quoted, because the initial argument to the function, '(+ 2 (* 3 2)), was quoted? Could it be that because the initial argument to prefix-postfix, '(+ 2 (* 3 2)), is quoted, (* 3 2) is also quoted and therefore does not get evaluated? Stefan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Some Problem with Recursion
2010/9/10 Stefan Rohlfing stefan.rohlf...@gmail.com:
@ Nicolas and ajuc
Thank you very much for showing me where I went wrong! With so many
parentheses it sometimes happens that I misplace one
Now the output of the function is as expected:
(defn prefix-postfix [expr]
(if (coll? expr)
(let [ [op arg1 arg2] expr]
[ (prefix-postfix arg1) (prefix-postfix arg2) op]) ;; --
removed on parenthesis here
expr))
(prefix-postfix '(+ 2 (* 3 2)))
;; -- [2 [3 2 *] +]
There is just one point I still don't quite understand. That is,
during one of the recursive calls, the expression (* 3 2) is passed as
an argument to prefix-postfix:
(prefix-postfix (* 3 2))
As prefix-postfix is a normal function and not a macro, (* 3 2)
should get evaluated BEFORE being passed to the function. However,
this is not the case here.
Could it be that because (* 3 2) is quoted, because the initial
argument to the function, '(+ 2 (* 3 2)), was quoted?
Could it be that because the initial argument to prefix-postfix, '(+
2 (* 3 2)), is quoted, (* 3 2) is also quoted and therefore does not
get evaluated?
Yes. '(+ 2 (* 3 2)) being quoted means that the function receives a
datastructure : a list composed of the symbol +, the number 2, and
finally a list composed of the symbol *, the number 3 and the number
2.
' is a syntactic sugar for the special form named quote , whose
purpose is to not evaluate everything which is quoted, and just keep
as a datastructure what the reader has read.
And now, food for thought :-) :
user= (quote (defn x))
(defn x)
;; = See, no macroexpansion, just what the reader read
user= (read-string (defn x))
(defn x)
;; = I prove the point of above: just what the reader read
user= (quote (defn ^{:foo :bar} x))
(defn x)
;; = but in the above ^^^, where's :foo :bar ?
user= (meta (second (quote (defn ^{:foo :bar} x
{:foo :bar}
;; = it's there, but the reader has already interpreted the ^
(because it is a reader macro) and placed {:foo :bar} as the metadata
map for the symbol x
HTH,
--
Laurent
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Re: Some Problem with Recursion
Hi Laurent,
Thanks for your detailed explanation! It greatly helped me understand
the usage of quoting.
Stefan
On Sep 10, 5:27 pm, Laurent PETIT laurent.pe...@gmail.com wrote:
2010/9/10 Stefan Rohlfing stefan.rohlf...@gmail.com:
@ Nicolas and ajuc
Thank you very much for showing me where I went wrong! With so many
parentheses it sometimes happens that I misplace one
Now the output of the function is as expected:
(defn prefix-postfix [expr]
(if (coll? expr)
(let [ [op arg1 arg2] expr]
[ (prefix-postfix arg1) (prefix-postfix arg2) op]) ;; --
removed on parenthesis here
expr))
(prefix-postfix '(+ 2 (* 3 2)))
;; -- [2 [3 2 *] +]
There is just one point I still don't quite understand. That is,
during one of the recursive calls, the expression (* 3 2) is passed as
an argument to prefix-postfix:
(prefix-postfix (* 3 2))
As prefix-postfix is a normal function and not a macro, (* 3 2)
should get evaluated BEFORE being passed to the function. However,
this is not the case here.
Could it be that because (* 3 2) is quoted, because the initial
argument to the function, '(+ 2 (* 3 2)), was quoted?
Could it be that because the initial argument to prefix-postfix, '(+
2 (* 3 2)), is quoted, (* 3 2) is also quoted and therefore does not
get evaluated?
Yes. '(+ 2 (* 3 2)) being quoted means that the function receives a
datastructure : a list composed of the symbol +, the number 2, and
finally a list composed of the symbol *, the number 3 and the number
2.
' is a syntactic sugar for the special form named quote , whose
purpose is to not evaluate everything which is quoted, and just keep
as a datastructure what the reader has read.
And now, food for thought :-) :
user= (quote (defn x))
(defn x)
;; = See, no macroexpansion, just what the reader read
user= (read-string (defn x))
(defn x)
;; = I prove the point of above: just what the reader read
user= (quote (defn ^{:foo :bar} x))
(defn x)
;; = but in the above ^^^, where's :foo :bar ?
user= (meta (second (quote (defn ^{:foo :bar} x
{:foo :bar}
;; = it's there, but the reader has already interpreted the ^
(because it is a reader macro) and placed {:foo :bar} as the metadata
map for the symbol x
HTH,
--
Laurent
--
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Re: A difficult Metaphor for Macros (especially for Java people)
On Sep 9, 5:06 pm, alux alu...@googlemail.com wrote: But, @Luc pushing the advantage of Lisp macros to the forefront is not obvious if the audience cannot compare with another (good/simple) implementation they understand well. Thats why I want to use a nifty metaphor ;-) Even your dumbest Java developer knows that javac (or ant, or maven, or Eclipse, or *something*) converts their source to JVM byte code. Finding a familiar example is not hard. Compilers might not be a perfect example perhaps because maybe people think of compilers as big, complicated, high magic. But, clearly, they don't have to be. Any rewriting system should be a suitable analogy. As I said before, the macro concept should be as plain as the nose on your face. As other people have said, the cool part is that lisp macros are written in lisp and integrate with the compiler/interpreter in a cool way. That can only be internalized (grokked) by writing your own macros and reading good examples. How do you force someone to do that? You make it part of some other goal they are trying to achieve. Right? Why did you study semi- conductor physics? Because you had to before they'd let you do transistors, before they'd let you do logic gates, before they'd let you do microprocessors, before they'd let you do assembly, before they'd let you do C, before they'd let you do algorithms, before they'd let you do AI. Which is all you ever *really* wanted to do in the first place! Adam -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Problem importing JOptionPane from a string evaluated by load-string
I'm just trying out Clojure a bit, so this may be an obvious simple thing I'm misunderstanding. This code in the test file below allows editing a Clojure function that is updated when an Update Code button is pressed, with the new value connected to a GUI button Click Me! as a proxy ActionListener. It starts with a default function that has not been dynamically loaded from a string that pops up a JOptionPane that displays the text in the text pane. Evaluating simple code like (fn [] (println \Hello World\)) with no import dependencies works. What am I doing wrong to not have the evaluated code have access to JOptionPane? I get: user= Exception in thread AWT-EventQueue-0 java.lang.Exception: No such namespace: JOptionPane (NO_SOURCE_FILE:6) when I try the Update Code button. The initial text includes an import statement. What do I misunderstand that the import does not seem to work? Anyway, I'm new to Clojure, so I don't really get the import or ns command that well yet. Any suggestions would be appreciated. Feel free to treat this code example as if it were in the public domain. === guitest2.clj (ns org.pointrel.guitest2 ;(:require ) ;(:use ) ;(:import ) ) (import '(javax.swing JFrame JPanel JButton JOptionPane JTextPane) '(java.awt.event ActionListener)) (defn hookupActionPerformed [receiver function] (println updating hook receiver function) (let [act (proxy [ActionListener] [] (actionPerformed [event] (function)))] (.addActionListener receiver act) ) ) (def initial-text (fn [] (println \Hello World\) (println (+ 2 2)) ;(ns org.pointrel.guitest2) (import '(javax.swing JOptionPane)) (JOptionPane/showMessageDialog nil \Hello from the text panel\ \Greeting\ JOptionPane/INFORMATION_MESSAGE) ) ) (defn window [] (def frame (JFrame. Hello Frame)) (def panel (JPanel.)) (.setContentPane frame panel) (def test-button (JButton. Click Me!)) (.add panel test-button) (def update-button (JButton. Update code)) (.add panel update-button) (def text (JTextPane.)) (.setText text initial-text) (.add panel text) (defn say-hello [] (let [text-contents (.getText text)] (JOptionPane/showMessageDialog nil text-contents Greeting JOptionPane/INFORMATION_MESSAGE))) (hookupActionPerformed test-button say-hello) (defn update-code [] (let [text-contents (.getText text) discard (printf text-contents) user-function (load-string text-contents)] (println update-code) (.removeActionListener test-button (aget (.getListeners test-button ActionListener) 0)) (hookupActionPerformed test-button user-function) )) (hookupActionPerformed update-button update-code) (.setSize frame 200 200) (.setVisible frame true) ) (window) ; (eval (read-string (println \Hello World\))) ; (load-string (fn [] (println \Hello World\))) ; (eval ((fn [] (println Hello World2 === There's probably stylistic issue, too. :-) By the way, the println calls don't seem to show up in NetBeans 6.9.1 with Enclojure after the window opens, and when I try to use code that generates an error I get Repl is disconnected that I don't know how to recover from without restarting NetBeans, so I am testing this with: $ java -cp jline-0.9.94.jar:clojure.jar jline.ConsoleRunner clojure.main Clojure 1.2.0 user= (load-file guitest2.clj) --Paul Fernhout http://www.pdfernhout.net/ The biggest challenge of the 21st century is the irony of technologies of abundance in the hands of those thinking in terms of scarcity. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
On Sep 9, 6:06 pm, Phil Hagelberg p...@hagelb.org wrote:
On Thu, Sep 9, 2010 at 8:38 AM, Mike Meyer
mwm-keyword-googlegroups.620...@mired.org wrote:
And two tools - lein and clojure itself.
I'm not sure Clojure should be counted separately since you're not
installing it yourself.
So we go from 3, 0, 1 to 6, 4, 2. I'm not sure that qualifies as
simple, but at least there's less boilerplate for the tools than there
is actual source code.
Really I think your complaint boils down to not being able to modify
the classpath at runtime. If the JVM had a real load-path like other
lisps offer then this would be enough:
(use 'ring.adapter.jetty 'ring.util.response)
(run-jetty (constantly (response hello world))
{:port 8080 :join? false})
...and we're back to three lines.
Now I'm not defending the fact that the classpath is fixed at
JVM-launch time--it's an awful hack that is an embarrassment to the
awesome engineering prowess that has gone in to other parts of the
JVM. But we do have tools to work around that flaw, and it's good to
recognize the root of the problem rather than its symptoms.
Except the classpath is *not* fixed at all! The concept of classpath
does not exist inside the JVM. Classloaders do. Classloaders are
objects like any other - you can create new instances of them, and
alter their state. Classpath is just an environment variable / command-
line argument to java, used to conveniently initialize the system
classloader from the outside world. In fact, many JVM-based dynamic
languages allow the classpath to be changed at runtime. I know for
sure BeanShell does, and ABCL does too - I contributed the patch to
it.
As for the OP's quest for simplicity - I agree that often things are
overly complicated in the Java world. However, I think that comparing
Apache's cgi-bin with .war packaged applications is unfair, since they
do have different goals. If you want the same drop file in
diredirectoryctory and be done with it experience, follow these
steps:
1) download Tomcat and unzip it in $tomcat
2) put clojure.jar is $tomcat/webapps/ROOT/WEB-INF/lib
this installs the server. Then, for each application, put a .jsp
file in $tomcat/webapps/ROOT containing:
% out.print(clojure.lang.RT.eval((foo bar baz))); %
(or whatever the right incantation is to eval from Java). done. Browse
http://localhost:8080/scriptName.jsp to run it. Of course, I'd NOT
recommend this, but you seem to know what you want.
Cheers,
Alessio
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Re: testing local functions?
On 10 September 2010 12:24, alux alu...@googlemail.com wrote: I always thought it to be good style to make helper functions only as visible as needed, e.g. by using letfn. But when I want to test my code, I just dont see a way to access these local functions for tests. I don't believe you can. You could make them private functions, and then test them by referring directly to their vars, e.g. (#'your.namespace/private-function ...) But in general, your tests should be testing your public interface, not a specific implementation. Your tests shouldn't care what your code does behind the scenes, so long as the publicly accessible functions return the correct result. - James -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: testing local functions?
Hi James, thanks for your answer. your tests should be testing your public interface Hhmmm. Well, I tend to disagree here. I sometimes like to have tests in place for things I want to refactor. To not inadvertently do something foolish. But I agree that this is not easily accomplishable. Greetings, alux On 10 Sep., 13:39, James Reeves jree...@weavejester.com wrote: On 10 September 2010 12:24, alux alu...@googlemail.com wrote: I always thought it to be good style to make helper functions only as visible as needed, e.g. by using letfn. But when I want to test my code, I just dont see a way to access these local functions for tests. I don't believe you can. You could make them private functions, and then test them by referring directly to their vars, e.g. (#'your.namespace/private-function ...) But in general, your tests should be testing your public interface, not a specific implementation. Your tests shouldn't care what your code does behind the scenes, so long as the publicly accessible functions return the correct result. - James -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: testing local functions?
From someone who's window to your code is your public API, a refactoring should make no observable change. So if you only test on the public API, but you test it thoroughly, then your tests will ensure that this property holds. Tests that delve into implementation details and private things, are more brittle because they are affected by changes in implementation details. On Fri, Sep 10, 2010 at 14:16, alux alu...@googlemail.com wrote: Hi James, thanks for your answer. your tests should be testing your public interface Hhmmm. Well, I tend to disagree here. I sometimes like to have tests in place for things I want to refactor. To not inadvertently do something foolish. But I agree that this is not easily accomplishable. Greetings, alux On 10 Sep., 13:39, James Reeves jree...@weavejester.com wrote: On 10 September 2010 12:24, alux alu...@googlemail.com wrote: I always thought it to be good style to make helper functions only as visible as needed, e.g. by using letfn. But when I want to test my code, I just dont see a way to access these local functions for tests. I don't believe you can. You could make them private functions, and then test them by referring directly to their vars, e.g. (#'your.namespace/private-function ...) But in general, your tests should be testing your public interface, not a specific implementation. Your tests shouldn't care what your code does behind the scenes, so long as the publicly accessible functions return the correct result. - James -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- Venlig hilsen / Kind regards, Christian Vest Hansen. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
On Sep 9, 11:47 am, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: On Thu, 9 Sep 2010 16:28:48 +0100 Edmund Jackson edmundsjack...@gmail.com wrote: Hi Mike, Could you perhaps present a counter-example of greater simplicity ? $ cat - /usr/local/www/apache22/cgi-bin/hello-world.sh #!/bin/sh echo 'Content-type: text/plain\n' echo Hello World ^D $ chomd 755 /usr/local/www/apache22/cgi-bin/hello-world.sh Done. Three lines of source code. 0 lines of framework setup. 1 tool (sh). Pretty much the same thing works for python, perl, etc. It's about as robust as can be asked for - that's the nature of apache. Performance is going to be mediocre at best. That's the trade-off for simplicity. mike cat - /usr/local/www/apache22/cgi-bin/hello-world #!/usr/local/bin/clj (println Content-type: text/plain\n) (println Hello, World!) ^D Is that simple enough? For better startup performance, you can use Nailgun. -John -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Problem importing JOptionPane from a string evaluated by load-string
Try printing out the *ns* variable in the fn. Chances are your code is being created in a different *ns* than it is being run. You can also try using the fully qualified path to get to JOptionPane, that may help too. On Sep 9, 9:43 pm, Paul D. Fernhout pdfernh...@kurtz-fernhout.com wrote: I'm just trying out Clojure a bit, so this may be an obvious simple thing I'm misunderstanding. This code in the test file below allows editing a Clojure function that is updated when an Update Code button is pressed, with the new value connected to a GUI button Click Me! as a proxy ActionListener. It starts with a default function that has not been dynamically loaded from a string that pops up a JOptionPane that displays the text in the text pane. Evaluating simple code like (fn [] (println \Hello World\)) with no import dependencies works. What am I doing wrong to not have the evaluated code have access to JOptionPane? I get: user= Exception in thread AWT-EventQueue-0 java.lang.Exception: No such namespace: JOptionPane (NO_SOURCE_FILE:6) when I try the Update Code button. The initial text includes an import statement. What do I misunderstand that the import does not seem to work? Anyway, I'm new to Clojure, so I don't really get the import or ns command that well yet. Any suggestions would be appreciated. Feel free to treat this code example as if it were in the public domain. === guitest2.clj (ns org.pointrel.guitest2 ;(:require ) ;(:use ) ;(:import ) ) (import '(javax.swing JFrame JPanel JButton JOptionPane JTextPane) '(java.awt.event ActionListener)) (defn hookupActionPerformed [receiver function] (println updating hook receiver function) (let [act (proxy [ActionListener] [] (actionPerformed [event] (function)))] (.addActionListener receiver act) ) ) (def initial-text (fn [] (println \Hello World\) (println (+ 2 2)) ;(ns org.pointrel.guitest2) (import '(javax.swing JOptionPane)) (JOptionPane/showMessageDialog nil \Hello from the text panel\ \Greeting\ JOptionPane/INFORMATION_MESSAGE) ) ) (defn window [] (def frame (JFrame. Hello Frame)) (def panel (JPanel.)) (.setContentPane frame panel) (def test-button (JButton. Click Me!)) (.add panel test-button) (def update-button (JButton. Update code)) (.add panel update-button) (def text (JTextPane.)) (.setText text initial-text) (.add panel text) (defn say-hello [] (let [text-contents (.getText text)] (JOptionPane/showMessageDialog nil text-contents Greeting JOptionPane/INFORMATION_MESSAGE))) (hookupActionPerformed test-button say-hello) (defn update-code [] (let [text-contents (.getText text) discard (printf text-contents) user-function (load-string text-contents)] (println update-code) (.removeActionListener test-button (aget (.getListeners test-button ActionListener) 0)) (hookupActionPerformed test-button user-function) )) (hookupActionPerformed update-button update-code) (.setSize frame 200 200) (.setVisible frame true) ) (window) ; (eval (read-string (println \Hello World\))) ; (load-string (fn [] (println \Hello World\))) ; (eval ((fn [] (println Hello World2 === There's probably stylistic issue, too. :-) By the way, the println calls don't seem to show up in NetBeans 6.9.1 with Enclojure after the window opens, and when I try to use code that generates an error I get Repl is disconnected that I don't know how to recover from without restarting NetBeans, so I am testing this with: $ java -cp jline-0.9.94.jar:clojure.jar jline.ConsoleRunner clojure.main Clojure 1.2.0 user= (load-file guitest2.clj) --Paul Fernhouthttp://www.pdfernhout.net/ The biggest challenge of the 21st century is the irony of technologies of abundance in the hands of those thinking in terms of scarcity. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Problem importing JOptionPane from a string evaluated by load-string
Got it. You cannot invoke (import) (or (ns)) from within the function definition. The function is already being evaluated, and it's too late. This works fine for me: (do (import '(javax.swing JOptionPane)) ((fn [] (println Hello World) (println (+ 2 2)) (JOptionPane/showMessageDialog nil Hello from the text panel Greeting JOptionPane/INFORMATION_MESSAGE So be aware that then some namespace will be changed by the call to import (side effect on *ns*). I would suggest either you create a temporary namespace for the code to execute, either as Sean suggested, you write the call to JOptionPane static methods and fields fully qualified: (javax.swing.JOptionPane/showMessageDialog ...) HTH, -- Laurent 2010/9/10 Paul D. Fernhout pdfernh...@kurtz-fernhout.com: I'm just trying out Clojure a bit, so this may be an obvious simple thing I'm misunderstanding. This code in the test file below allows editing a Clojure function that is updated when an Update Code button is pressed, with the new value connected to a GUI button Click Me! as a proxy ActionListener. It starts with a default function that has not been dynamically loaded from a string that pops up a JOptionPane that displays the text in the text pane. Evaluating simple code like (fn [] (println \Hello World\)) with no import dependencies works. What am I doing wrong to not have the evaluated code have access to JOptionPane? I get: user= Exception in thread AWT-EventQueue-0 java.lang.Exception: No such namespace: JOptionPane (NO_SOURCE_FILE:6) when I try the Update Code button. The initial text includes an import statement. What do I misunderstand that the import does not seem to work? Anyway, I'm new to Clojure, so I don't really get the import or ns command that well yet. Any suggestions would be appreciated. Feel free to treat this code example as if it were in the public domain. === guitest2.clj (ns org.pointrel.guitest2 ;(:require ) ;(:use ) ;(:import ) ) (import '(javax.swing JFrame JPanel JButton JOptionPane JTextPane) '(java.awt.event ActionListener)) (defn hookupActionPerformed [receiver function] (println updating hook receiver function) (let [act (proxy [ActionListener] [] (actionPerformed [event] (function)))] (.addActionListener receiver act) ) ) (def initial-text (fn [] (println \Hello World\) (println (+ 2 2)) ;(ns org.pointrel.guitest2) (import '(javax.swing JOptionPane)) (JOptionPane/showMessageDialog nil \Hello from the text panel\ \Greeting\ JOptionPane/INFORMATION_MESSAGE) ) ) (defn window [] (def frame (JFrame. Hello Frame)) (def panel (JPanel.)) (.setContentPane frame panel) (def test-button (JButton. Click Me!)) (.add panel test-button) (def update-button (JButton. Update code)) (.add panel update-button) (def text (JTextPane.)) (.setText text initial-text) (.add panel text) (defn say-hello [] (let [text-contents (.getText text)] (JOptionPane/showMessageDialog nil text-contents Greeting JOptionPane/INFORMATION_MESSAGE))) (hookupActionPerformed test-button say-hello) (defn update-code [] (let [text-contents (.getText text) discard (printf text-contents) user-function (load-string text-contents)] (println update-code) (.removeActionListener test-button (aget (.getListeners test-button ActionListener) 0)) (hookupActionPerformed test-button user-function) )) (hookupActionPerformed update-button update-code) (.setSize frame 200 200) (.setVisible frame true) ) (window) ; (eval (read-string (println \Hello World\))) ; (load-string (fn [] (println \Hello World\))) ; (eval ((fn [] (println Hello World2 === There's probably stylistic issue, too. :-) By the way, the println calls don't seem to show up in NetBeans 6.9.1 with Enclojure after the window opens, and when I try to use code that generates an error I get Repl is disconnected that I don't know how to recover from without restarting NetBeans, so I am testing this with: $ java -cp jline-0.9.94.jar:clojure.jar jline.ConsoleRunner clojure.main Clojure 1.2.0 user= (load-file guitest2.clj) --Paul Fernhout http://www.pdfernhout.net/ The biggest challenge of the 21st century is the irony of technologies of abundance in the hands of those thinking in terms of scarcity. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to
Re: Problem importing JOptionPane from a string evaluated by load-string
I've also used the with-ns package in contrib to fix this. On Sep 10, 9:03 am, Laurent PETIT laurent.pe...@gmail.com wrote: Got it. You cannot invoke (import) (or (ns)) from within the function definition. The function is already being evaluated, and it's too late. This works fine for me: (do (import '(javax.swing JOptionPane)) ((fn [] (println Hello World) (println (+ 2 2)) (JOptionPane/showMessageDialog nil Hello from the text panel Greeting JOptionPane/INFORMATION_MESSAGE So be aware that then some namespace will be changed by the call to import (side effect on *ns*). I would suggest either you create a temporary namespace for the code to execute, either as Sean suggested, you write the call to JOptionPane static methods and fields fully qualified: (javax.swing.JOptionPane/showMessageDialog ...) HTH, -- Laurent 2010/9/10 Paul D. Fernhout pdfernh...@kurtz-fernhout.com: I'm just trying out Clojure a bit, so this may be an obvious simple thing I'm misunderstanding. This code in the test file below allows editing a Clojure function that is updated when an Update Code button is pressed, with the new value connected to a GUI button Click Me! as a proxy ActionListener. It starts with a default function that has not been dynamically loaded from a string that pops up a JOptionPane that displays the text in the text pane. Evaluating simple code like (fn [] (println \Hello World\)) with no import dependencies works. What am I doing wrong to not have the evaluated code have access to JOptionPane? I get: user= Exception in thread AWT-EventQueue-0 java.lang.Exception: No such namespace: JOptionPane (NO_SOURCE_FILE:6) when I try the Update Code button. The initial text includes an import statement. What do I misunderstand that the import does not seem to work? Anyway, I'm new to Clojure, so I don't really get the import or ns command that well yet. Any suggestions would be appreciated. Feel free to treat this code example as if it were in the public domain. === guitest2.clj (ns org.pointrel.guitest2 ;(:require ) ;(:use ) ;(:import ) ) (import '(javax.swing JFrame JPanel JButton JOptionPane JTextPane) '(java.awt.event ActionListener)) (defn hookupActionPerformed [receiver function] (println updating hook receiver function) (let [act (proxy [ActionListener] [] (actionPerformed [event] (function)))] (.addActionListener receiver act) ) ) (def initial-text (fn [] (println \Hello World\) (println (+ 2 2)) ;(ns org.pointrel.guitest2) (import '(javax.swing JOptionPane)) (JOptionPane/showMessageDialog nil \Hello from the text panel\ \Greeting\ JOptionPane/INFORMATION_MESSAGE) ) ) (defn window [] (def frame (JFrame. Hello Frame)) (def panel (JPanel.)) (.setContentPane frame panel) (def test-button (JButton. Click Me!)) (.add panel test-button) (def update-button (JButton. Update code)) (.add panel update-button) (def text (JTextPane.)) (.setText text initial-text) (.add panel text) (defn say-hello [] (let [text-contents (.getText text)] (JOptionPane/showMessageDialog nil text-contents Greeting JOptionPane/INFORMATION_MESSAGE))) (hookupActionPerformed test-button say-hello) (defn update-code [] (let [text-contents (.getText text) discard (printf text-contents) user-function (load-string text-contents)] (println update-code) (.removeActionListener test-button (aget (.getListeners test-button ActionListener) 0)) (hookupActionPerformed test-button user-function) )) (hookupActionPerformed update-button update-code) (.setSize frame 200 200) (.setVisible frame true) ) (window) ; (eval (read-string (println \Hello World\))) ; (load-string (fn [] (println \Hello World\))) ; (eval ((fn [] (println Hello World2 === There's probably stylistic issue, too. :-) By the way, the println calls don't seem to show up in NetBeans 6.9.1 with Enclojure after the window opens, and when I try to use code that generates an error I get Repl is disconnected that I don't know how to recover from without restarting NetBeans, so I am testing this with: $ java -cp jline-0.9.94.jar:clojure.jar jline.ConsoleRunner clojure.main Clojure 1.2.0 user= (load-file guitest2.clj) --Paul Fernhout http://www.pdfernhout.net/ The biggest challenge of the 21st century is the irony of technologies of abundance in the hands of those thinking in terms of scarcity. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to
Re: Simple things should be simple
Just to be contrary ;) A one time investment of 2 minutes (I did have to scrounge in contrib to locate these after all): (defn make-stupid-simple-script [f content] (spit f content) (sh chmod 755 (.getName f))) for the eternal pleasure of using: user= (make-stupid-simple-script (File. /usr/local/www/apache22/cgi- bin/hello-world.sh) #!/bin/sh\n echo 'Content-type: text/plain\\n' echo Hello World) Feel free to take this and run with it :) On Sep 9, 9:47 am, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: On Thu, 9 Sep 2010 16:28:48 +0100 Edmund Jackson edmundsjack...@gmail.com wrote: Hi Mike, Could you perhaps present a counter-example of greater simplicity ? $ cat - /usr/local/www/apache22/cgi-bin/hello-world.sh #!/bin/sh echo 'Content-type: text/plain\n' echo Hello World ^D $ chomd 755 /usr/local/www/apache22/cgi-bin/hello-world.sh Done. Three lines of source code. 0 lines of framework setup. 1 tool (sh). Pretty much the same thing works for python, perl, etc. It's about as robust as can be asked for - that's the nature of apache. Performance is going to be mediocre at best. That's the trade-off for simplicity. mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail -www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
On Fri, Sep 10, 2010 at 4:47 AM, John Cromartie jcromar...@gmail.com wrote: #!/usr/local/bin/clj (println Content-type: text/plain\n) (println Hello, World!) ^D Is that simple enough? That was my thought too, java/clojure console app should not be more complex than python etc. The issue is the startup time For better startup performance, you can use Nailgun. How can nailjun help here ? I am not too familiar with it. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: [ANN] Leiningen 1.3.1
I solved my maven corruption problem. On if the m2 index folder was not cleaned properly. Luc P, lprefonta...@softaddicts.ca wrote .. Hi Phil, I upgraded to 1.3.1 but started to experience some problems with my our-classe-only hook. I made it return 0 since 1.3.1 expects a numeric return code from the compile task but then ended up with other problems in the jar task. I want to revert to 1.3.0 for a few days. Any idea about the recipe I should follow ? I downloaded the 1.3.0 script, cleared my local maven cache but it lein deps always install 1.3.1. I am missing a file to clear but did not figured it out yet. Any clues ? I'll investigate my problems with 1.3.1 and the compile hook later next week. Thank you, Luc P. Phil Hagelberg p...@hagelb.org wrote .. I'm pleased to announce the release of Leiningen 1.3.1. This release fixes a few key bugs and introduces a handful of minor features. Here are the highlights. Bug Fixes: * Performing a standalone install (a new feature of Leiningen 1.3.0) now pulls in all transitive dependencies. * Unreadable input won't cause issues in the repl. * Huge classpaths no longer cause slowdown on boot. * Namespaces for test and help tasks are no longer skipped if their first form is not a call to the ns macro. * Uberjar task will not proceed if compilation fails. New Features: * The shell-wrapper scripts may be customized. * repl task may be used outside the context of a project. * If :min-lein-version is set, users of an older Leiningen version will see a warning. * Dependency jar types may be specified. (test, javadoc, etc.) * Regexes may be used to specify namespaces in :aot list. We also have improved Windows support with a zip file that should get you everything you need: http://github.com/downloads/technomancy/leiningen/lein-win32.zip More details about the changes are at http://bit.ly/lein-news I'm particularly interested in the shell-wrapper functionality since right now it's quite awkward to create Clojure projects that are first-class citizens when it comes to the command-line. I think shell-wrappers have the potential to significantly improve the situation. I'm hoping to write up some more documentation on this, but you can see the basics under Shell Wrappers near the bottom of the tutorial: http://github.com/technomancy/leiningen/blob/master/TUTORIAL.md As always, thanks to the contributors who submitted patches for this release: Shantanu Kumar, Colin Jones, Isaac Hodes, Alan Dipert, John Sanda, and Alex Ott, as well as all 47 of you who have contributed in the past: http://www.ohloh.net/p/leiningen/contributors If you'd like to be involved in the next release, I've started a thread with a roadmap for 1.4.0 on the Leiningen mailing list: http://groups.google.com/group/leiningen/browse_thread/thread/8352bbb974034bff Enjoy! -Phil -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Leiningen-1.4.0-SNAPSHOT missing
Hi List, Today, trying to setup Clojure I downloaded 'leiningen.bat' from (http://github.com/technomancy/leiningen/raw/master/bin/lein.bat) and 'self-install' fails: C:\Users\Bahmanlein self-install SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc syswgetrc = C:\Program Files\GnuWin32/etc/wgetrc --2010-09-10 18:56:58-- http://github.com/downloads/technomancy/leiningen/leiningen-1.4.0-SNAPSHOT-standalone.jar Resolving github.com... 207.97.227.239 Connecting to github.com|207.97.227.239|:80... connected. HTTP request sent, awaiting response... 404 Not Found 2010-09-10 18:56:59 ERROR 404: Not Found. *** DOWNLOAD FAILED! Check URL/Version. *** Also another strange thing is that when I open a command prompt and enter 'lein self-install' it fails; I figured out I have to issue a dummy 'lein new' first for 'self-install' to start. C:\Users\Bahmanlein self-install The syntax of the command is incorrect. C:\Users\Bahmanlein new t C:\Applications\Leiningen\leiningen-1.4.0-SNAPSHOT-standalone.jar can not be found. You can try running lein self-install or change LEIN_JAR environment variable or edit lein.bat to set appropriate LEIN_JAR path. C:\Users\Bahmanlein self-install SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc syswgetrc = C:\Program Files\GnuWin32/etc/wgetrc ... -- Bahman Movaqar (http://BahmanM.com) ERP Evaluation, Implementation Deployment Consultant PGP Key ID: 0x3750102D (keyserver2.pgp.com) signature.asc Description: OpenPGP digital signature
Re: Simple things should be simple
Finally, cat - /usr/local/www/apache22/cgi-bin/hello-world #!/usr/local/bin/clj (println Content-type: text/plain\n) (println Hello, World!) ^D I can start using Clojure again :) John -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A difficult Metaphor for Macros (especially for Java people)
Adam Burry abu...@gmail.com wrote .. On Sep 9, 5:06 pm, alux alu...@googlemail.com wrote: But, @Luc pushing the advantage of Lisp macros to the forefront is not obvious if the audience cannot compare with another (good/simple) implementation they understand well. Thats why I want to use a nifty metaphor ;-) Even your dumbest Java developer knows that javac (or ant, or maven, or Eclipse, or *something*) converts their source to JVM byte code. Finding a familiar example is not hard. ??? converting to byte code (machine instructions) has nothing to do with macro processing... Macros can stand by themselves without being embedded in a compiler (m4, ...) Or perhaps I miss understood your statement ? Luc P. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
On Sep 10, 1:32 am, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: I think that Java's strength is enterprise-level, highly scalable web servers make people assume that every problem must be a nail for that hammer. I think that Unix's strength is small independent programs communicating over standard I/O makes you assume that every environment must be a hammer for that nail. The JVM environment is philosophically quite different from Unix. Don't use a JVM language to write one-liners that have to be loaded every time they're run. There's not much point in people continuing to defend Clojure and/or the java ecosystem; unix has its place and so does java. You've noticed a symptom of something fundamental in java, you're not particularly happy about it, so choose a different tool. Hashbang script hacks, nailgun, or other workarounds aren't going to change your mind. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
What is ring/jetty doing with my *out*?
It seems that when using ring/jetty, *out* is getting eaten or thrown away. I'm a n00b to clojure and the java world in general, but it seems odd that (prn something) should silently fail? I'm guessing that I'm missing some configuration somewhere? Help? :) --Colin -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Leiningen-1.4.0-SNAPSHOT missing
On 2010/9/10 19:07, Bahman Movaqar wrote: Hi List, Today, trying to setup Clojure I downloaded 'leiningen.bat' from (http://github.com/technomancy/leiningen/raw/master/bin/lein.bat) and 'self-install' fails: C:\Users\Bahmanlein self-install SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc syswgetrc = C:\Program Files\GnuWin32/etc/wgetrc --2010-09-10 18:56:58-- http://github.com/downloads/technomancy/leiningen/leiningen-1.4.0-SNAPSHOT-standalone.jar Resolving github.com... 207.97.227.239 Connecting to github.com|207.97.227.239|:80... connected. HTTP request sent, awaiting response... 404 Not Found 2010-09-10 18:56:59 ERROR 404: Not Found. *** DOWNLOAD FAILED! Check URL/Version. *** Also another strange thing is that when I open a command prompt and enter 'lein self-install' it fails; I figured out I have to issue a dummy 'lein new' first for 'self-install' to start. C:\Users\Bahmanlein self-install The syntax of the command is incorrect. C:\Users\Bahmanlein new t C:\Applications\Leiningen\leiningen-1.4.0-SNAPSHOT-standalone.jar can not be found. You can try running lein self-install or change LEIN_JAR environment variable or edit lein.bat to set appropriate LEIN_JAR path. C:\Users\Bahmanlein self-install SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc syswgetrc = C:\Program Files\GnuWin32/etc/wgetrc ... Forgot to add that with some help on IRC I changed LEIN_VERSION to 1.3.1 and it worked. -- Bahman Movaqar (http://BahmanM.com) ERP Evaluation, Implementation Deployment Consultant PGP Key ID: 0x3750102D (keyserver2.pgp.com) signature.asc Description: OpenPGP digital signature
Re: What is ring/jetty doing with my *out*?
On 10 September 2010 15:39, Colin Steele cvillecste...@gmail.com wrote: It seems that when using ring/jetty, *out* is getting eaten or thrown away. I'm a n00b to clojure and the java world in general, but it seems odd that (prn something) should silently fail? I'm guessing that I'm missing some configuration somewhere? Help? :) *out* should be untouched. I regularly use prn from within the Jetty adapter with no issue. Can your reproduce the issue? Perhaps provide some cut-down example that should print to *out* but doesn't? - James -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure 1.2 and the Computer Language Benchmarks Game
On Sep 9, 10:15 pm, gary ng garyng2...@gmail.com wrote: On Thu, Sep 9, 2010 at 10:04 PM, Isaac Gouy igo...@yahoo.com wrote: Is there any point speculating about this as outsiders? It was available - Data.HashTable seems to be copyright 2003. http://ogi.altocumulus.org/~hallgren/Programatica/tools/pfe.cgi?Data Huh ? point ? it was just a casual comment, no point was intended. And I have read some comments by Don that what is in the shoutout is way faster than Data.HashTable If you knew there was another option why write I doubt there is any choice for Haskell ? And Data.HashTable also use some mutable array thing so it is still not the idiomatic Haskell of everything is immutable. afaict idiomatic is everything referentially transparent not everything immutable, as in - I needed a halfway decent mutable collection type – having a properly tested mutable collection that actually performs well would be a godsend. how can you assure that(let's put aside the under the hood things where it is done in C) if you break the assumption that value can be changed. Reading the first paragraph Introduction to Uniqueness Typing of this paper should help you with that question - http://www.st.cs.ru.nl/papers/2008/vrie08-IFL07-UniquenessTypingSimplified.pdf BTW, it seems that to verteran Haskellers, the speed of Data.HashTable is not a concern to them as they said they don't see the need of that(mutable hasktable) in their usage. There seems to be a bug(as in it is slow) filed for this package for quite a while but no one even bother to attempt to improve it. I'm not going to speculate about what unnamed verteran Haskellers have or have not said. Read the bug report and you'll see that the root problem was GC - do you think changing GC is a quick fix? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Macro problems with delay
That ought to be correct, but I can't reconcile that with the error message. Doesn't the Can't embed object in code, maybe print-dup not defined error only appear in macros, when some object being spliced into a macro's expansion is not a basic Clojure form? Yet, you are correct, commenting out that function call in the macro does prevent the error. I don't understand it. Konrad Hinsen wrote: On 10 Sep 2010, at 03:11, joshua-choi wrote: And here is a full macro-expansion of the call at which the error happens: http://gist.github.com/572879 If I understand the comment (the following form is the culprit...) correctly, it's not the macroexpansion that fails, but the evaluation of the resulting expression. Is that correct? In that case, it's not really a macro problem, but a problem with a complex use case of alter- var-root. Konrad. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A difficult Metaphor for Macros (especially for Java people)
On Sep 10, 1:10 pm, lprefonta...@softaddicts.ca wrote: Adam Burry abu...@gmail.com wrote .. On Sep 9, 5:06 pm, alux alu...@googlemail.com wrote: But, @Luc pushing the advantage of Lisp macros to the forefront is not obvious if the audience cannot compare with another (good/simple) implementation they understand well. Thats why I want to use a nifty metaphor ;-) Even your dumbest Java developer knows that javac (or ant, or maven, or Eclipse, or *something*) converts their source to JVM byte code. Finding a familiar example is not hard. ??? converting to byte code (machine instructions) has nothing to do with macro processing... Macros can stand by themselves without being embedded in a compiler (m4, ...) Or perhaps I miss understood your statement ? It has everything to do with macro processing. Macros convert one expression into another. For example, depending on how your lisp is set up: (cond (case1 action1) (case2 action2) (case3 action3)) can map to: (if case1 action1 (if case2 action2 (if case3 action3 'nil))) What do you think the compiler does? Recall, the OP said: How do I describe what it is all about in this Code is Data, and Macros let you grow your own language towards the problem stuff? Well, Java is data to javac. Adam -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Clojure User Group around Geneva ?
Hi everyone, As a beginner in Clojure, I'm wondering if there is any kind of Clojure User Group around Geneva ? (If not, some friends of mine and I are willing to create one.) Thanks in advance, __ s t -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Macro problems with delay
You're right about the namespace-qualification: I accidentally macroexpanded with syntax-quote rather than quote. My mistake; the actual expansion is the same, but without namespace-qualification. Using (var ~fn-name) results in the same error, unfortunately. I think now the attempted embedding of a delay into macro code is somewhere else, but I don't know. Meikel Brandmeyer wrote: Hi, On 10 Sep., 03:11, joshua-choi rbysam...@gmail.com wrote: I am running into a problem sometimes when I call a certain macro I defined. This problem macro (and an associated problem function) is: http://gist.github.com/572875 I run into this error (which is at a call to the macro, but *not* at the *first* time it's called for some reason!): http://gist.github.com/572824 And here is a full macro-expansion of the call at which the error happens: http://gist.github.com/572879 I *cannot* figure this out. The error seems to be that there's a delay directly being embedded in some macro's form, but the delay call in the function that's causing the problem…is in a function! How can the delay show up at hound.clj's compile time? I must confess, I'm not sure, what's going on. However the expansion looks suspicious. Everything is namespace qualified. One thing core does differently to your approach is using the var special form. You might try: (defmacro general-defmaker [def-form description rule-type-kw fn-name forms] `(do (~def-form ~fn-name ~...@forms) (alter-var-root (var ~fn-name) named-rule-maker ~rule-type-kw) (var ~fn-name))) But this is just guessing. As I said above: everything is qualified. So maybe the problem is at some surrounding macro or so. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Leiningen-1.4.0-SNAPSHOT missing
On Fri, Sep 10, 2010 at 7:37 AM, Bahman Movaqar b.mova...@gmail.com wrote: Also another strange thing is that when I open a command prompt and enter 'lein self-install' it fails; I figured out I have to issue a dummy 'lein new' first for 'self-install' to start. C:\Users\Bahmanlein self-install The syntax of the command is incorrect. I don't have Windows to test on, but the documentation for the Windows installation was out of date; I just got a patch to fix it. Do the current instructions work for you? -Phil -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
clojure-test-mode elpa version still out of date?
I'm using emacs starter kit and clojure-test-mode 1.4 installed using elpa. Running clojure-tests-run-tests seems to work fine, but clojure- test-run-test seems flakey. This blog post from May says the elpa version is out of date. http://otfrom.wordpress.com/2010/05/16/leiningen-clojure-1-2-and-emacs/ However, now clojure-test-mode won’t work. The version is elpa isn’t new enough (you are using elpa and emacs-starter-kit aren’t you?) so we need to get it from technomancy’s github. Does anybody know if the elpa version is still out of date? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
On Fri, Sep 10, 2010 at 1:27 AM, Laurent PETIT laurent.pe...@gmail.com wrote: These last few months, working on ccw has been particularly interesting because I've had feedback from users, especially Lee. Lee has challenged a lot of what I had considered to be simple things in ccw. I can say that when you're in a position of expert, it's hard to change your mind, because at first, you reject the new user's points as invalid. dang. well said, and needs to be said more! somebody buy this man a thank you drink :) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Macro problems with delay
I've solved the problem. I found that it only occurred when general- defmaker was called with its forms argument containing another general- defmaker call with def-form being defmacro. Thus, in the inner general- defmaker call, the *result* of (NamedRule. (delay …)) was embedded into a defmacro call, resulting in the error. The solution was to change (alter-var-root maker-var# named-rule-maker ~rule-type-kw) to (when (= '~def-form `defmacro) (alter-var-root maker-var# named-rule-maker ~rule-type-kw)) Thanks, everyone for your help. joshua-choi wrote: That ought to be correct, but I can't reconcile that with the error message. Doesn't the Can't embed object in code, maybe print-dup not defined error only appear in macros, when some object being spliced into a macro's expansion is not a basic Clojure form? Yet, you are correct, commenting out that function call in the macro does prevent the error. I don't understand it. Konrad Hinsen wrote: On 10 Sep 2010, at 03:11, joshua-choi wrote: And here is a full macro-expansion of the call at which the error happens: http://gist.github.com/572879 If I understand the comment (the following form is the culprit...) correctly, it's not the macroexpansion that fails, but the evaluation of the resulting expression. Is that correct? In that case, it's not really a macro problem, but a problem with a complex use case of alter- var-root. Konrad. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure 1.2 and the Computer Language Benchmarks Game
On Fri, Sep 10, 2010 at 8:49 AM, Isaac Gouy igo...@yahoo.com wrote: Huh ? point ? it was just a casual comment, no point was intended. And I have read some comments by Don that what is in the shoutout is way faster than Data.HashTable If you knew there was another option why write I doubt there is any choice for Haskell ? That was referring to the original comment about 'making a mutable implementation' meaning the program itself ASKED for that particular functionality. The one in the shoutout is one implementation of it, the one in Data.HashTable is another. When I said no choice, I was saying no choice but to implement a mutable hash table, in respond to the underlying message of 'why did they implement a mutable hashtable' as if making it mutable is only for performance purpose. And Data.HashTable also use some mutable array thing so it is still not the idiomatic Haskell of everything is immutable. afaict idiomatic is everything referentially transparent not everything immutable, as in - I needed a halfway decent mutable collection type – having a properly tested mutable collection that actually performs well would be a godsend. how can you assure that(let's put aside the under the hood things where it is done in C) if you break the assumption that value can be changed. Reading the first paragraph Introduction to Uniqueness Typing of this paper should help you with that question - http://www.st.cs.ru.nl/papers/2008/vrie08-IFL07-UniquenessTypingSimplified.pdf Would try to digest that. I'm not going to speculate about what unnamed verteran Haskellers have or have not said. Read the bug report and you'll see that the root problem was GC - do you think changing GC is a quick fix? Don suggested on reddit for some fixes that tackle the GC issue(not changing the GC, but the way to get around the performance caused by GC), using similar approach as in the shoutout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
A Clojure Scholarship: Let's send Raynes to the Conj!
With a huge helping hand from Relevance, the host of the Conj in October, I'm hoping we can make it possible for Anthony Simpson (you may know him as Raynes in #clojure irc) to attend the conference. The blog post tells the story: http://bit.ly/9dmeDe I hope you'll check it out, and help in whatever small way you can. Many thanks, - Chas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: What is ring/jetty doing with my *out*?
Ahhh... I found it. I was actually using print not prn. Switching to prn works! :) (flushing?) On Sep 10, 11:30 am, James Reeves jree...@weavejester.com wrote: On 10 September 2010 15:39, Colin Steele cvillecste...@gmail.com wrote: It seems that when using ring/jetty, *out* is getting eaten or thrown away. I'm a n00b to clojure and the java world in general, but it seems odd that (prn something) should silently fail? I'm guessing that I'm missing some configuration somewhere? Help? :) *out* should be untouched. I regularly use prn from within the Jetty adapter with no issue. Can your reproduce the issue? Perhaps provide some cut-down example that should print to *out* but doesn't? - James -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure 1.2 and the Computer Language Benchmarks Game
On Sep 10, 10:35 am, gary ng garyng2...@gmail.com wrote: On Fri, Sep 10, 2010 at 8:49 AM, Isaac Gouy igo...@yahoo.com wrote: Huh ? point ? it was just a casual comment, no point was intended. And I have read some comments by Don that what is in the shoutout is way faster than Data.HashTable If you knew there was another option why write I doubt there is any choice for Haskell ? That was referring to the original comment about 'making a mutable implementation' meaning the program itself ASKED for that particular functionality. The one in the shoutout is one implementation of it, the one in Data.HashTable is another. When I said no choice, I was saying no choice but to implement a mutable hash table, in respond to the underlying message of 'why did they implement a mutable hashtable' as if making it mutable is only for performance purpose. Clearly, they did choose to write all that code in order to get a much faster program - I can't tell you if Andy had noticed the benchmark was about Hashtable update and k-nucleotide strings or whether he knew about Data.HashTable. And Data.HashTable also use some mutable array thing so it is still not the idiomatic Haskell of everything is immutable. afaict idiomatic is everything referentially transparent not everything immutable, as in - I needed a halfway decent mutable collection type – having a properly tested mutable collection that actually performs well would be a godsend. how can you assure that(let's put aside the under the hood things where it is done in C) if you break the assumption that value can be changed. Reading the first paragraph Introduction to Uniqueness Typing of this paper should help you with that question - http://www.st.cs.ru.nl/papers/2008/vrie08-IFL07-UniquenessTypingSimpl... Would try to digest that. Bite-sized: An important property of pure functional programming languages is referential transparency: the same expression used twice must have the same value twice. A side effect on a variable (file) is okay as long as that variable is never used again: it is okay for a function to modify its input if the input is not shared. Referential transparency then trivially holds because the same expression never occurs more than once. Rather than just returning the read character, fgetc returns a pair consisting of the read character and a new file, file1. Although file0 and file1 point to the same file on disk, they are conceptually and syntactically different, and thus it is clear that a and b may have different values. I'm not going to speculate about what unnamed verteran Haskellers have or have not said. Read the bug report and you'll see that the root problem was GC - do you think changing GC is a quick fix? Don suggested on reddit for some fixes that tackle the GC issue(not changing the GC, but the way to get around the performance caused by GC), using similar approach as in the shoutout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Leiningen-1.4.0-SNAPSHOT missing
On 2010/9/10 21:42, Phil Hagelberg wrote: On Fri, Sep 10, 2010 at 7:37 AM, Bahman Movaqar b.mova...@gmail.com wrote: Also another strange thing is that when I open a command prompt and enter 'lein self-install' it fails; I figured out I have to issue a dummy 'lein new' first for 'self-install' to start. C:\Users\Bahmanlein self-install The syntax of the command is incorrect. I don't have Windows to test on, but the documentation for the Windows installation was out of date; I just got a patch to fix it. Do the current instructions work for you? No. I changed the file a bit to make it work and also remove the trivial bug I earlier mentioned and it works for me. I attach the file. Thanks, -- Bahman Movaqar (http://BahmanM.com) ERP Evaluation, Implementation Deployment Consultant PGP Key ID: 0x3750102D (keyserver2.pgp.com) @echo off set LEIN_VERSION=1.3.1 rem it is possible to set LEIN_JAR variable manually rem so we don't overwrite them if x%LEIN_JAR% neq x goto LEIN_JAR_SET set LEIN_DIR=%~dp0 set LEIN_JAR=%LEIN_DIR%leiningen-%LEIN_VERSION%-standalone.jar :LEIN_JAR_SET if x%1 == xself-install goto SELF_INSTALL if x%1 == xupgrade goto NO_UPGRADE rem If the command is not 'self-install' or 'upgrade' then check for LEIN_JAR first. if not exist %LEIN_JAR% goto NO_LEIN_JAR rem ## rem count number of command line arguments rem set ARGCOUNT=0 for %%a in (%*) do set /a ARGCOUNT+=1 rem ## rem ## rem add jars found under lib directory to CLASSPATH rem call :FIND_DIR_CONTAINING_UPWARDS project.clj if %DIR_CONTAINING% neq cd %DIR_CONTAINING% setLocal EnableDelayedExpansion set CP= for /R ./lib %%a in (*.jar) do ( set CP=!CP!;%%a ) set CP=!CP! set CLASSPATH=%LEIN_JAR%;%CP%;%CLASSPATH% if x%DEBUG% == x goto RUN echo CLASSPATH=%CLASSPATH% rem ## :RUN if x%1 == xrepl goto RUN_REPL if %ARGCOUNT% == 2 goto RUN_ARG2 if %ARGCOUNT% == 3 goto RUN_ARG3 java -client -cp %CLASSPATH% clojure.main -e (use 'leiningen.core) (-main \%1\) goto EOF :RUN_ARG2 java -client -cp %CLASSPATH% clojure.main -e (use 'leiningen.core) (-main \%1\ \%2\) goto EOF :RUN_ARG3 java -client -cp %CLASSPATH% clojure.main -e (use 'leiningen.core) (-main \%1\ \%2\ \%3\) goto EOF :RUN_REPL %RLWRAP% java -client %JAVA_OPTS% -cp src;classes;%CLASSPATH% clojure.main %2 %3 %4 goto EOF :NO_LEIN_JAR echo. echo %LEIN_JAR% can not be found. echo You can try running lein self-install echo or change LEIN_JAR environment variable echo or edit lein.bat to set appropriate LEIN_JAR path. echo. goto EOF :SELF_INSTALL if exist %LEIN_JAR% ( echo 15 echo %LEIN_JAR% already exists. Delete and retry. echo 17 goto EOF ) set HTTP_CLIENT=wget -O wgetnul 21 if ERRORLEVEL 9009 ( curlnul 21 if ERRORLEVEL 9009 goto NO_HTTP_CLIENT set HTTP_CLIENT=curl -f -L -o ) set LEIN_DIR=%~dp0 set LEIN_JAR=%LEIN_DIR%leiningen-%LEIN_VERSION%-standalone.jar set LEIN_JAR_URL=http://github.com/downloads/technomancy/leiningen/leiningen-%LEIN_VERSION%-standalone.jar %HTTP_CLIENT% %LEIN_JAR% %LEIN_JAR_URL% if ERRORLEVEL 1 ( del %LEIN_JAR%nul 21 goto DOWNLOAD_FAILED ) goto EOF :DOWNLOAD_FAILED echo. echo *** DOWNLOAD FAILED! Check URL/Version. *** echo. goto EOF :NO_HTTP_CLIENT echo. echo ERROR: Wget/Curl not found. Make sure at least either of Wget and Curl is echoinstalled and is in PATH. You can get them from URLs below: echo. echo Wget: http://users.ugent.be/~bpuype/wget/; echo Curl: http://curl.haxx.se/dlwiz/?type=binos=Win32flav=-ver=2000/XP; echo. goto EOF :NO_UPGRADE echo. echo Upgrade feature is not available on Windows. Please edit the value of echo variable LEIN_VERSION in file %~f0 echo then run lein self-install. echo. goto EOF rem Find directory containing filename supplied in first argument rem looking in current directory, and looking up the parent rem chain until we find it, or run out rem returns result in %DIR_CONTAINING% rem empty string if we don't find it :FIND_DIR_CONTAINING_UPWARDS set DIR_CONTAINING=%CD% set LAST_DIR= :LOOK_AGAIN if %DIR_CONTAINING% == %LAST_DIR% ( rem didn't find it set DIR_CONTAINING= goto :EOF ) if EXIST %DIR_CONTAINING%\%1 ( rem found it - use result in DIR_CONTAINING goto :EOF ) set LAST_DIR=%DIR_CONTAINING% call :GET_PARENT_PATH %DIR_CONTAINING%\.. set DIR_CONTAINING=%PARENT_PATH% goto :LOOK_AGAIN :GET_PARENT_PATH set PARENT_PATH=%~f1 goto :EOF :EOF signature.asc Description: OpenPGP digital signature
Re: Leiningen-1.4.0-SNAPSHOT missing
On 2010/9/10 21:42, Phil Hagelberg wrote: On Fri, Sep 10, 2010 at 7:37 AM, Bahman Movaqar b.mova...@gmail.com wrote: Also another strange thing is that when I open a command prompt and enter 'lein self-install' it fails; I figured out I have to issue a dummy 'lein new' first for 'self-install' to start. C:\Users\Bahmanlein self-install The syntax of the command is incorrect. I don't have Windows to test on, but the documentation for the Windows installation was out of date; I just got a patch to fix it. Do the current instructions work for you? Once again I forgot to add that: Yes, the download section is working as expected. Thank you. -- Bahman Movaqar (http://BahmanM.com) ERP Evaluation, Implementation Deployment Consultant PGP Key ID: 0x3750102D (keyserver2.pgp.com) signature.asc Description: OpenPGP digital signature
Re: clojure-test-mode elpa version still out of date?
I downloaded clojure-mode from http://github.com/technomancy/clojure-mode and installed both clojure-mode.el and clojure-test-mode.el using M-x package-install-from-buffer. On the following set of tests, M-x clojure-test-run-tests seems to work, but M-x clojure-test-run-test on just the pass function seems to run against the entire file and (is false No tests have been written. gets highlighted red in the buffer). (ns test-test.test.core (:use [clojure.test])) (deftest pass (is true This test should pass.)) (deftest replace-me ;; FIXME: write (is false No tests have been written.)) The History section in clojure-test-mode.el contains ;; 1.4: 2010-05-13 ;; * Fix jump-to-test ;; * Update to work with Clojure 1.2. ;; * Added next/prev problem. ;; * Depend upon slime, not swank-clojure. ;; * Don't move the mark when activating. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure 1.2 and the Computer Language Benchmarks Game
On Fri, Sep 10, 2010 at 11:13 AM, Isaac Gouy igo...@yahoo.com wrote: Clearly, they did choose to write all that code in order to get a much faster program - I can't tell you if Andy had noticed the benchmark was about Hashtable update and k-nucleotide strings or whether he knew about Data.HashTable. I know they did it to get a faster program, but under the requirement of : IT MUST BE MUTABLE HASHTABLE If you change the requirement to something else that acheives the end result without this specific requirement, they may not use hashtable at all. Which is also the message I get from various place like reddit or stackoverlow about this same issue. That is 'use your language's strength to solve the problem, not to mimic other language, i.e. the what not the how'. And this sentiment is not unique to Haskell. I recently saw similar questions on J language of 'how can I write a Haskell style filter(HOF)', the overall answers there are 'you don't need haskell style filter and can achieve the same result in a J way'. Similarly for Haskell which is 'you don't need to use mutable hash table and can very likely get the same result using other immutable data structure' But in this case the problem is 'implement a mutable hashtable' which is what my 'no choice' was referring to. Unlike language say Python or F# where hash table is in general considered to be part of the language, Data.HashTable is not. It is just one 'sample' of implementation of mutable hash table which happens to be slow. And Data.HashTable also use some mutable array thing so it is still not the idiomatic Haskell of everything is immutable. afaict idiomatic is everything referentially transparent not everything immutable, as in - I needed a halfway decent mutable collection type – having a properly tested mutable collection that actually performs well would be a godsend. how can you assure that(let's put aside the under the hood things where it is done in C) if you break the assumption that value can be changed. Reading the first paragraph Introduction to Uniqueness Typing of this paper should help you with that question - http://www.st.cs.ru.nl/papers/2008/vrie08-IFL07-UniquenessTypingSimpl... Would try to digest that. Bite-sized: An important property of pure functional programming languages is referential transparency: the same expression used twice must have the same value twice. A side effect on a variable (file) is okay as long as that variable is never used again: it is okay for a function to modify its input if the input is not shared. Referential transparency then trivially holds because the same expression never occurs more than once. Rather than just returning the read character, fgetc returns a pair consisting of the read character and a new file, file1. Although file0 and file1 point to the same file on disk, they are conceptually and syntactically different, and thus it is clear that a and b may have different values. I read this part, trying to fit that into this mutable hashtable context. Below this paragraph, it mentioned some requirement/assumption that file0, file1 ... cannot be 're-used' which I don't know how to apply to hashtable. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Clojure Scholarship: Let's send Raynes to the Conj!
Did we really get this done in an hour? I haven't been part of the community for long, but Rayne has been helpful to me already on #clojure so I was going to donate a bit. Did I already miss my chance? On Sep 10, 10:39 am, Chas Emerick cemer...@snowtide.com wrote: With a huge helping hand from Relevance, the host of the Conj in October, I'm hoping we can make it possible for Anthony Simpson (you may know him as Raynes in #clojure irc) to attend the conference. The blog post tells the story: http://bit.ly/9dmeDe I hope you'll check it out, and help in whatever small way you can. Many thanks, - Chas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Clojure Scholarship: Let's send Raynes to the Conj!
Welcome to Clojure On Sep 10, 2:55 pm, Alan a...@malloys.org wrote: Did we really get this done in an hour? I haven't been part of the community for long, but Rayne has been helpful to me already on #clojure so I was going to donate a bit. Did I already miss my chance? On Sep 10, 10:39 am, Chas Emerick cemer...@snowtide.com wrote: With a huge helping hand from Relevance, the host of the Conj in October, I'm hoping we can make it possible for Anthony Simpson (you may know him as Raynes in #clojure irc) to attend the conference. The blog post tells the story: http://bit.ly/9dmeDe I hope you'll check it out, and help in whatever small way you can. Many thanks, - Chas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: testing local functions?
I've worked out a way to test local functions. When I tried it out by hand, it felt good. See here: http://bit.ly/b1AoG7 Implementing it is on my wishlist for Midje, my test framework. http://github.com/marick/Midje On Sep 10, 2010, at 6:24 AM, alux wrote: Hello, I always thought it to be good style to make helper functions only as visible as needed, e.g. by using letfn. But when I want to test my code, I just dont see a way to access these local functions for tests. - Brian Marick, independent consultant Mostly on agile methods with a testing slant Author of /Programming Cocoa with Ruby/ www.exampler.com, www.exampler.com/blog, www.twitter.com/marick -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Clojure Scholarship: Let's send Raynes to the Conj!
Just a little over an hour, yes! Raynes is going to the Conj. Thanks to all who donated. More info, numbers, and more thank-yous here: http://bit.ly/aj0XPr And, if you *wanted* to donate, but ended up coming in after we hit our goal, please read the above post anyway. :-) Thanks again to all! - Chas On Sep 10, 2010, at 2:55 PM, Alan wrote: Did we really get this done in an hour? I haven't been part of the community for long, but Rayne has been helpful to me already on #clojure so I was going to donate a bit. Did I already miss my chance? On Sep 10, 10:39 am, Chas Emerick cemer...@snowtide.com wrote: With a huge helping hand from Relevance, the host of the Conj in October, I'm hoping we can make it possible for Anthony Simpson (you may know him as Raynes in #clojure irc) to attend the conference. The blog post tells the story: http://bit.ly/9dmeDe I hope you'll check it out, and help in whatever small way you can. Many thanks, - Chas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
On Fri, 10 Sep 2010 00:03:22 -0700 (PDT) Meikel Brandmeyer m...@kotka.de wrote: Hi, On 9 Sep., 20:46, Mike Meyer mwm-keyword-googlegroups. 620...@mired.org wrote: The first problem with that is that this stuff seems show up *everywhere* in Javaland. It's not just web apps, it's pretty much anything. You just lost me completely with your argumentation. I wrote a small desktop utility (simple problem, simple solution, simple program) which is distributed to different locations in the company. It works on Windows and Unix w/o adaption to the system. Download jar and double-click / execute via java -jar. It works without library version hell, complicated Makefiles, system differences and other shenanigans. I'm quite willing to pay more complexity upfront to have it easier in the end. Ok, let's see how this goes: With simple things are simple tools, for a simple problem with a simple solution and a simple program, the solution goes like this: 1) Write program in chosen unix-friendly interpreted language. 2) Distribute program text file. Users can then run it via double-clicking (mac windows), running it directly on the command line (mac unix) or - under extreme duress - running it via the interpreter on the command line. As far as I can tell, to do the same thing with Java tools, the steps are: 1) Write program in chosen language that runs on the JVM. 2) Compile program to class file(s). 3) Use some tool to create a manifest file. 4) Run jar to create jar file. 5) Distribute jar file. Users can then run it via double-clicking (mac windows) or via the interpreter on the command line (mac unix). There is no option to run it directly on the command line. Possibly some tool will do steps 3 and 4 in single step for you. So the Javaland tools take at least twice as many steps, and deliver a solution that's harder to use in some cases. Of course, I'm not as familiar with Javaland tools as I am Unix tools, so maybe I got it wrong. If so, *please* tell me the better way! It is obvious that Clojure doesn't fit your needs. Then simply don't use it. Wrong. It may be that the Java infrastructure that Clojure runs in is baroque enough that I won't be willing to use it. Then the same would be true of any language running on the JVM. On the other hand, a Clojure that ran on, oh, Parrot just for instance, wouldn't have any of these problems. mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail - www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Clojure Scholarship: Let's send Raynes to the Conj!
I wrote a brief thank you post on my blog (actually the first post on this new blog. :) http://blog.acidrayne.net/thank-you-for-sending-me-to-the-conj I'm unbelievably excited. I love you guys. On Sep 10, 2:09 pm, Chas Emerick cemer...@snowtide.com wrote: Just a little over an hour, yes! Raynes is going to the Conj. Thanks to all who donated. More info, numbers, and more thank-yous here: http://bit.ly/aj0XPr And, if you *wanted* to donate, but ended up coming in after we hit our goal, please read the above post anyway. :-) Thanks again to all! - Chas On Sep 10, 2010, at 2:55 PM, Alan wrote: Did we really get this done in an hour? I haven't been part of the community for long, but Rayne has been helpful to me already on #clojure so I was going to donate a bit. Did I already miss my chance? On Sep 10, 10:39 am, Chas Emerick cemer...@snowtide.com wrote: With a huge helping hand from Relevance, the host of the Conj in October, I'm hoping we can make it possible for Anthony Simpson (you may know him as Raynes in #clojure irc) to attend the conference. The blog post tells the story: http://bit.ly/9dmeDe I hope you'll check it out, and help in whatever small way you can. Many thanks, - Chas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
On Fri, 10 Sep 2010 07:11:18 -0700 gary ng garyng2...@gmail.com wrote: On Fri, Sep 10, 2010 at 4:47 AM, John Cromartie jcromar...@gmail.com wrote: #!/usr/local/bin/clj (println Content-type: text/plain\n) (println Hello, World!) ^D Is that simple enough? That was my thought too, java/clojure console app should not be more complex than python etc. The issue is the startup time For better startup performance, you can use Nailgun. How can nailjun help here ? I am not too familiar with it. Nailgun is a java server, for want of a better term. You start it with the classpath you want. You then run a front end that you pass the classname arguments you'd normally hand to java, and it runs them. Instead of exiting when they end, it hangs around so the next time you run it, you don't have to reload the classes. mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail - www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Generating functions programmatically
Hi, I'm developing a small DSL with Clojure and I need to define many similar functions. I'd like to do that programmatically, of course. My solution (involving a simple macro) doesn't work, so I won't bother you with it. I'll post it if anyone asks. Basically what I need is: given a list of keywords, for each keyword x i need to define a function whose name is (str prefix- (name x)). The function has a very short body which uses x in one place (something like (fn [n] (= n x))). Can you help me please? I've been banging my head against this for over four hours and I'm getting a little frustrated. Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Macro problems with delay
This still doesn't quite add up to me. What's the consequence of not alter-var-root'ing maker-var# if def-form is a defmacro? Why would def-form be a defmacro in the first place? Also, I don't think you've given the example of the actual call that gave the error, only the macroexpansion of it. Can you provide that as well? thanks, Cyrus On Sep 10, 2010, at 10:30 AM, joshua-choi wrote: I've solved the problem. I found that it only occurred when general- defmaker was called with its forms argument containing another general- defmaker call with def-form being defmacro. Thus, in the inner general- defmaker call, the *result* of (NamedRule. (delay …)) was embedded into a defmacro call, resulting in the error. The solution was to change (alter-var-root maker-var# named-rule-maker ~rule-type-kw) to (when (= '~def-form `defmacro) (alter-var-root maker-var# named-rule-maker ~rule-type-kw)) Thanks, everyone for your help. joshua-choi wrote: That ought to be correct, but I can't reconcile that with the error message. Doesn't the Can't embed object in code, maybe print-dup not defined error only appear in macros, when some object being spliced into a macro's expansion is not a basic Clojure form? Yet, you are correct, commenting out that function call in the macro does prevent the error. I don't understand it. Konrad Hinsen wrote: On 10 Sep 2010, at 03:11, joshua-choi wrote: And here is a full macro-expansion of the call at which the error happens: http://gist.github.com/572879 If I understand the comment (the following form is the culprit...) correctly, it's not the macroexpansion that fails, but the evaluation of the resulting expression. Is that correct? In that case, it's not really a macro problem, but a problem with a complex use case of alter- var-root. Konrad. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Clojure Scholarship: Let's send Raynes to the Conj!
Just told that the site went down: not sure why, but I'll work on it later. Sorry. 3 On Sep 10, 2:21 pm, Rayne disciplera...@gmail.com wrote: I wrote a brief thank you post on my blog (actually the first post on this new blog. :)http://blog.acidrayne.net/thank-you-for-sending-me-to-the-conj I'm unbelievably excited. I love you guys. On Sep 10, 2:09 pm, Chas Emerick cemer...@snowtide.com wrote: Just a little over an hour, yes! Raynes is going to the Conj. Thanks to all who donated. More info, numbers, and more thank-yous here: http://bit.ly/aj0XPr And, if you *wanted* to donate, but ended up coming in after we hit our goal, please read the above post anyway. :-) Thanks again to all! - Chas On Sep 10, 2010, at 2:55 PM, Alan wrote: Did we really get this done in an hour? I haven't been part of the community for long, but Rayne has been helpful to me already on #clojure so I was going to donate a bit. Did I already miss my chance? On Sep 10, 10:39 am, Chas Emerick cemer...@snowtide.com wrote: With a huge helping hand from Relevance, the host of the Conj in October, I'm hoping we can make it possible for Anthony Simpson (you may know him as Raynes in #clojure irc) to attend the conference. The blog post tells the story: http://bit.ly/9dmeDe I hope you'll check it out, and help in whatever small way you can. Many thanks, - Chas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
I actually did this just the other day, to create a simple C-style enum macro (I assume someone has a better version; this was a learning exercise). You can see my project at www.github.com/amalloy/enum. It sounds like your problem might be constructing the symbol to define; the solution will look something like: (let [fn-sym (- name (str prefix-) symbol)] `(defn ~fn-sym [args] body)) On Sep 10, 12:39 pm, icemaze icem...@gmail.com wrote: Hi, I'm developing a small DSL with Clojure and I need to define many similar functions. I'd like to do that programmatically, of course. My solution (involving a simple macro) doesn't work, so I won't bother you with it. I'll post it if anyone asks. Basically what I need is: given a list of keywords, for each keyword x i need to define a function whose name is (str prefix- (name x)). The function has a very short body which uses x in one place (something like (fn [n] (= n x))). Can you help me please? I've been banging my head against this for over four hours and I'm getting a little frustrated. Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
SPOILER BELOW. I'm not sure how much help you want, so I went ahead and wrote your macro. Whitespace padding so that you won't see it if you don't want the whole solution: user= (defmacro make-fn [key] (let [sym (- key name (str synthetic-) symbol)] `(defn ~sym [n#] (= n# ~key #'user/make-fn user= (make-fn :a) #'user/synthetic-a user= (synthetic-a :q) false user= (synthetic-a :a) true user= (macroexpand '(make-fn :a)) (def synthetic-a (.withMeta (clojure.core/fn synthetic-a ([n__1041__auto__] (clojure.core/= n__1041__auto__ :a))) (.meta (var synthetic-a On Sep 10, 1:02 pm, Alan a...@malloys.org wrote: I actually did this just the other day, to create a simple C-style enum macro (I assume someone has a better version; this was a learning exercise). You can see my project atwww.github.com/amalloy/enum. It sounds like your problem might be constructing the symbol to define; the solution will look something like: (let [fn-sym (- name (str prefix-) symbol)] `(defn ~fn-sym [args] body)) On Sep 10, 12:39 pm, icemaze icem...@gmail.com wrote: Hi, I'm developing a small DSL with Clojure and I need to define many similar functions. I'd like to do that programmatically, of course. My solution (involving a simple macro) doesn't work, so I won't bother you with it. I'll post it if anyone asks. Basically what I need is: given a list of keywords, for each keyword x i need to define a function whose name is (str prefix- (name x)). The function has a very short body which uses x in one place (something like (fn [n] (= n x))). Can you help me please? I've been banging my head against this for over four hours and I'm getting a little frustrated. Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Clojure Scholarship: Let's send Raynes to the Conj!
It's working for me now (but wasn't earlier, so this is probably a sign that it's fixed). On Sep 10, 12:57 pm, Rayne disciplera...@gmail.com wrote: Just told that the site went down: not sure why, but I'll work on it later. Sorry. 3 On Sep 10, 2:21 pm, Rayne disciplera...@gmail.com wrote: I wrote a brief thank you post on my blog (actually the first post on this new blog. :)http://blog.acidrayne.net/thank-you-for-sending-me-to-the-conj I'm unbelievably excited. I love you guys. On Sep 10, 2:09 pm, Chas Emerick cemer...@snowtide.com wrote: Just a little over an hour, yes! Raynes is going to the Conj. Thanks to all who donated. More info, numbers, and more thank-yous here: http://bit.ly/aj0XPr And, if you *wanted* to donate, but ended up coming in after we hit our goal, please read the above post anyway. :-) Thanks again to all! - Chas On Sep 10, 2010, at 2:55 PM, Alan wrote: Did we really get this done in an hour? I haven't been part of the community for long, but Rayne has been helpful to me already on #clojure so I was going to donate a bit. Did I already miss my chance? On Sep 10, 10:39 am, Chas Emerick cemer...@snowtide.com wrote: With a huge helping hand from Relevance, the host of the Conj in October, I'm hoping we can make it possible for Anthony Simpson (you may know him as Raynes in #clojure irc) to attend the conference. The blog post tells the story: http://bit.ly/9dmeDe I hope you'll check it out, and help in whatever small way you can. Many thanks, - Chas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: testing local functions?
Brian, thats way cool! (I still have to think this through, thats high magic!) Thank you for sharing this, and kind regards, alux On 10 Sep., 21:04, Brian Marick mar...@exampler.com wrote: I've worked out a way to test local functions. When I tried it out by hand, it felt good. See here:http://bit.ly/b1AoG7 Implementing it is on my wishlist for Midje, my test framework.http://github.com/marick/Midje On Sep 10, 2010, at 6:24 AM, alux wrote: Hello, I always thought it to be good style to make helper functions only as visible as needed, e.g. by using letfn. But when I want to test my code, I just dont see a way to access these local functions for tests. - Brian Marick, independent consultant Mostly on agile methods with a testing slant Author of /Programming Cocoa with Ruby/www.exampler.com,www.exampler.com/blog,www.twitter.com/marick -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
Alan, thank you for your reply. Unfortunately your solution is very similar to mine and it suffers from the same problem (maybe I'm using it incorrectly, I don't know). If I write: (doseq [x '(:a :b)] (make-fn x)) it defines a single function synthetic-x. Is there a way to make this work? I tried everything but both eval and var-get don't work for local bindings. Thanks again. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
On Fri, Sep 10, 2010 at 12:17 PM, Mike Meyer mwm-keyword-googlegroups.620...@mired.org wrote: 1) Write program in chosen language that runs on the JVM. 2) Compile program to class file(s). 3) Use some tool to create a manifest file. 4) Run jar to create jar file. 5) Distribute jar file. Users can then run it via double-clicking (mac windows) or via the interpreter on the command line (mac unix). There is no option to run it directly on the command line. It's true that the command-line situation with java is awful. Here's one solution that does a pretty good job of promoting the JVM to a first-class CLI citizen: http://hashdot.sourceforge.net/ Of course, it would also help a lot if Clojure shipped with its own shell script. -Phil -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure 1.2 and the Computer Language Benchmarks Game
On Sep 10, 11:54 am, gary ng garyng2...@gmail.com wrote: On Fri, Sep 10, 2010 at 11:13 AM, Isaac Gouy igo...@yahoo.com wrote: Clearly, they did choose to write all that code in order to get a much faster program - I can't tell you if Andy had noticed the benchmark was about Hashtable update and k-nucleotide strings or whether he knew about Data.HashTable. I know they did it to get a faster program, but under the requirement of : IT MUST BE MUTABLE HASHTABLE If you change the requirement to something else that acheives the end result without this specific requirement, they may not use hashtable at all. Which is also the message I get from various place like reddit or stackoverlow about this same issue. That is 'use your language's strength to solve the problem, not to mimic other language, i.e. the what not the how'. It's starting to look like actually there was a point you wanted to make ;-) If you change the requirement to something else you'd simply be missing the point - which was to look at hashtable updates and strings. Does it actually say that the hashtable updates have to be destructive? And this sentiment is not unique to Haskell. I recently saw similar questions on J language of 'how can I write a Haskell style filter(HOF)', the overall answers there are 'you don't need haskell style filter and can achieve the same result in a J way'. Similarly for Haskell which is 'you don't need to use mutable hash table and can very likely get the same result using other immutable data structure' But in this case the problem is 'implement a mutable hashtable' which is what my 'no choice' was referring to. Unlike language say Python or F# where hash table is in general considered to be part of the language, Data.HashTable is not. It is just one 'sample' of implementation of mutable hash table which happens to be slow. There's no choice in binary-trees either - you must use binary-trees and you must allocate all the memory. There's no choice in pi-digits either - you must use that particular step-by-step spigot algorithm taken from that Haskell paper. There's no choice in fannkuch-redux either - you must use that particular ordering of permutations taken from that Lisp paper. etc etc Forgive me but you do seem to be belabouring the obvious. -snip- Bite-sized: An important property of pure functional programming languages is referential transparency: the same expression used twice must have the same value twice. A side effect on a variable (file) is okay as long as that variable is never used again: it is okay for a function to modify its input if the input is not shared. Referential transparency then trivially holds because the same expression never occurs more than once. Rather than just returning the read character, fgetc returns a pair consisting of the read character and a new file, file1. Although file0 and file1 point to the same file on disk, they are conceptually and syntactically different, and thus it is clear that a and b may have different values. I read this part, trying to fit that into this mutable hashtable context. Below this paragraph, it mentioned some requirement/assumption that file0, file1 ... cannot be 're-used' which I don't know how to apply to hashtable. Do you know if we re-write that as - Rather than just returning the updated value, htAddOrUpdate returns a pair consisting of the updated value and a new hashtable, hashtable1. Although hashtable0 and hashtable1 point to the same structures in memory, they are conceptually and syntactically different, and thus it is clear that a and b may have different values. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: A Clojure Scholarship: Let's send Raynes to the Conj!
http://blog.acidrayne.net/?p=4 I threw up a wordpress site and posted this there. Maybe it'll last through a couple requests. :p On Sep 10, 2:57 pm, Rayne disciplera...@gmail.com wrote: Just told that the site went down: not sure why, but I'll work on it later. Sorry. 3 On Sep 10, 2:21 pm, Rayne disciplera...@gmail.com wrote: I wrote a brief thank you post on my blog (actually the first post on this new blog. :)http://blog.acidrayne.net/thank-you-for-sending-me-to-the-conj I'm unbelievably excited. I love you guys. On Sep 10, 2:09 pm, Chas Emerick cemer...@snowtide.com wrote: Just a little over an hour, yes! Raynes is going to the Conj. Thanks to all who donated. More info, numbers, and more thank-yous here: http://bit.ly/aj0XPr And, if you *wanted* to donate, but ended up coming in after we hit our goal, please read the above post anyway. :-) Thanks again to all! - Chas On Sep 10, 2010, at 2:55 PM, Alan wrote: Did we really get this done in an hour? I haven't been part of the community for long, but Rayne has been helpful to me already on #clojure so I was going to donate a bit. Did I already miss my chance? On Sep 10, 10:39 am, Chas Emerick cemer...@snowtide.com wrote: With a huge helping hand from Relevance, the host of the Conj in October, I'm hoping we can make it possible for Anthony Simpson (you may know him as Raynes in #clojure irc) to attend the conference. The blog post tells the story: http://bit.ly/9dmeDe I hope you'll check it out, and help in whatever small way you can. Many thanks, - Chas -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
Hi, Am 10.09.2010 um 21:17 schrieb Mike Meyer: 1) Write program in chosen unix-friendly interpreted language. You lost exactly here. unix-friendly. Since you keep putting your context over everything, I will also keep on putting mine over everything. Ruby, Python, Perl, Tcl, ... are all not installed on the machine I have to target. So writing things in them requires me to have two month dance with corporate IT only to get no support in the end. I'm sorry, but unix friendly interpreted language is *not* simple. Sincerely Meikel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure 1.2 and the Computer Language Benchmarks Game
On Fri, Sep 10, 2010 at 2:04 PM, Isaac Gouy igo...@yahoo.com wrote: It's starting to look like actually there was a point you wanted to make ;-) You mean the 'no chice' part ? yes. You mean the why not Data.Hashtable comment ? I don't think so. If you change the requirement to something else you'd simply be missing the point - which was to look at hashtable updates and strings. I know perfectly well what you want to measure and I was not implying if those measure is valid or not, I am totally neutral to the whole thing. My initial comment was all about 'it seems that Haskell submission is not the typical elegant form' and to me because of the specific you want to measure, there is no acceptable elegant Haskell form. Does it actually say that the hashtable updates have to be destructive? If want to go that route, be my guest. There's no choice in binary-trees either - you must use binary-trees and you must allocate all the memory. There's no choice in pi-digits either - you must use that particular step-by-step spigot algorithm taken from that Haskell paper. There's no choice in fannkuch-redux either - you must use that particular ordering of permutations taken from that Lisp paper. etc etc Indeed. Your benchmark suite are very specific about how certain things must be done in order to measure a specific aspect you want to measure. Forgive me but you do seem to be belabouring the obvious. I think you are too sensitive -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: clojure-test-mode elpa version still out of date?
Hi, On Fri, Sep 10, 2010 at 18:15, User7 userseven...@gmail.com wrote: I'm using emacs starter kit and clojure-test-mode 1.4 installed using elpa. Running clojure-tests-run-tests seems to work fine, but clojure- test-run-test seems flakey. This blog post from May says the elpa version is out of date. http://otfrom.wordpress.com/2010/05/16/leiningen-clojure-1-2-and-emacs/ However, now clojure-test-mode won’t work. The version is elpa isn’t new enough (you are using elpa and emacs-starter-kit aren’t you?) so we need to get it from technomancy’s github. Does anybody know if the elpa version is still out of date? I'm the author of that post and now use clojure-test-mode happily from elpa. cheers, Bruce -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
partition-starting-every : yet another partition function
problem: convert a collection [1 2 0 1 2 3 0 1 2 3 0 0 1 2] into partitions like: ((1 2) (0 1 2 3) (0 1 2 3) (0) (0 1 2)) In this case, start each partition on a 0. I looked at the various partition functions but none of them would do the trick without adding unnecessary complexity. Instead I wrote a new function based on partition-by: Solution: (defn partition-starting-every Partition the sequence starting each partition when the f is true. [f coll] (if-let [coll (seq coll)] (let [p (cons (first coll) (take-while (complement f) (rest coll)))] (lazy-seq (cons p (partition-starting-every f (drop (count p) coll))) user=(partition-starting-every zero? [1 2 0 1 2 3 0 1 2 3 0 0 1 2]) ((1 2) (0 1 2 3) (0 1 2 3) (0) (0 1 2)) Questions: 1 - Is there a simpler way to do this using existing partition functions? 2 - If not, is this something people are interested in having contributed? In looking at the partition functions they are very similar. Maybe there is a why to combine them in to a single function. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
Hi icemaze, Please look at how fns are generated in http.async.client http://github.com/neotyk/http.async.client/blob/master/src/http/async/client/util.clj#L54 this macro is later used here: http://github.com/neotyk/http.async.client/blob/master/src/http/async/client.clj#L43 HTH, Hubert. On Sep 10, 2010, at 9:39 PM, icemaze wrote: Hi, I'm developing a small DSL with Clojure and I need to define many similar functions. I'd like to do that programmatically, of course. My solution (involving a simple macro) doesn't work, so I won't bother you with it. I'll post it if anyone asks. Basically what I need is: given a list of keywords, for each keyword x i need to define a function whose name is (str prefix- (name x)). The function has a very short body which uses x in one place (something like (fn [n] (= n x))). Can you help me please? I've been banging my head against this for over four hours and I'm getting a little frustrated. Thanks. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure 1.2 and the Computer Language Benchmarks Game
On Sep 10, 2:22 pm, gary ng garyng2...@gmail.com wrote: -snip- My initial comment was all about 'it seems that Haskell submission is not the typical elegant form' and to me because of the specific you want to measure, there is no acceptable elegant Haskell form. So what are we to do when there's a problem that has no acceptable elegant Haskell form? Does it actually say that the hashtable updates have to be destructive? If want to go that route, be my guest. I don't understand what you mean, didn't you say - it must be a mutable hashtable? Why couldn't it be a hashtable that copied values? Indeed. Your benchmark suite are very specific about how certain things must be done in order to measure a specific aspect you want to measure. The other complaint is that it's not specific enough and allows too much play, with programs in one language being too different to programs in other languages. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
I see. It's hard to imagine how this could work, since macros don't have access to runtime data like the value of x in your example. Perhaps you're better off writing a function that returns a closure, and iteratively def'ing those? user= (defn make-kw-fn [kw] #(= kw %)) #'user/make-kw-fn user= (def kws [:a :b]) #'user/kws user= (eval (cons 'do (map #(list 'def (symbol (str test- (name %))) (make- kw-fn %)) kws))) #'user/test-b user= (test-b :a) false user= (test-b :b) true On Sep 10, 1:37 pm, icemaze icem...@gmail.com wrote: Alan, thank you for your reply. Unfortunately your solution is very similar to mine and it suffers from the same problem (maybe I'm using it incorrectly, I don't know). If I write: (doseq [x '(:a :b)] (make-fn x)) it defines a single function synthetic-x. Is there a way to make this work? I tried everything but both eval and var-get don't work for local bindings. Thanks again. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
PS this is super-ugly and I'm always embarrassed when I find myself using eval in a lisp. While this works, I'd love it if someone could tell me how to do it with macros. On Sep 10, 3:07 pm, Alan a...@malloys.org wrote: I see. It's hard to imagine how this could work, since macros don't have access to runtime data like the value of x in your example. Perhaps you're better off writing a function that returns a closure, and iteratively def'ing those? user= (defn make-kw-fn [kw] #(= kw %)) #'user/make-kw-fn user= (def kws [:a :b]) #'user/kws user= (eval (cons 'do (map #(list 'def (symbol (str test- (name %))) (make- kw-fn %)) kws))) #'user/test-b user= (test-b :a) false user= (test-b :b) true On Sep 10, 1:37 pm, icemaze icem...@gmail.com wrote: Alan, thank you for your reply. Unfortunately your solution is very similar to mine and it suffers from the same problem (maybe I'm using it incorrectly, I don't know). If I write: (doseq [x '(:a :b)] (make-fn x)) it defines a single function synthetic-x. Is there a way to make this work? I tried everything but both eval and var-get don't work for local bindings. Thanks again. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure 1.2 and the Computer Language Benchmarks Game
On Fri, Sep 10, 2010 at 3:06 PM, Isaac Gouy igo...@yahoo.com wrote: So what are we to do when there's a problem that has no acceptable elegant Haskell form? Depending on the intend, for you benchmark program, write something like what it is now. For real life cases, call an exnternal library, use another language, transform the solution into something that would not hit the weak point of the language(I recently saw an example of this on J about a simple but interesting quiz). Does it actually say that the hashtable updates have to be destructive? If want to go that route, be my guest. I don't understand what you mean, didn't you say - it must be a mutable hashtable? Why couldn't it be a hashtable that copied values? As I said, be my guest. Indeed. Your benchmark suite are very specific about how certain things must be done in order to measure a specific aspect you want to measure. The other complaint is that it's not specific enough and allows too much play, with programs in one language being too different to programs in other languages. not sure what you want to say. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Simple things should be simple
On Fri, 10 Sep 2010 23:21:01 +0200 Meikel Brandmeyer m...@kotka.de wrote: Hi, Am 10.09.2010 um 21:17 schrieb Mike Meyer: 1) Write program in chosen unix-friendly interpreted language. You lost exactly here. unix-friendly. Since you keep putting your context over everything, I will also keep on putting mine over everything. Ruby, Python, Perl, Tcl, ... are all not installed on the machine I have to target. So writing things in them requires me to have two month dance with corporate IT only to get no support in the end. I'm sorry, but unix friendly interpreted language is *not* simple. Fair enough. But Java is not installed on the machines *I* have to target, so writing things in a JVM language requires *me* to go through the multi-month dance with security just to be allowed to use it. (Come to that, I've already had clojure rejected by my current client because the JVM hasn't been vetted for security, and doing so wasn't worth the effort). In the real world, you get one of two situations: 1) Most linux distros, and a few Unix distros (including Macs) come with Java, Python, Perl, Ruby and most popular languages already installed. 2) Windows, the rest of the Unix distros and a few oddball Linux distros come *without* Java, Python, Perl, Tcl, Ruby etc. installed, so you have to go through some kind of dance to get them. As far as I can tell, neither one has an advantage over the other, unless you're in an environment where one has already been approved, and the other hasn't. I'm trying to be fair, and ignore things that are local aberrations that only need to be overcome once. I mean, really - if I complained that Clojure had a problem because it ran on the JVM and my clients don't want to go to the effort to vet the JVM, you'd be quite right in laughing at me and pointing out that the problem is with my clients, not with clojure. mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail - www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Convenience (was Simple things should be simple)
On Fri, 10 Sep 2010 17:29:24 -0400 Stuart Halloway stuart.hallo...@gmail.com wrote: Hi Mike, I think this is more about convenience than simplicity. In both Unix and Java deployment is complex, and often complicated as well. In spite of this, small, one-off things should be convenient to deploy, and Unix does this better in some contexts. There is no reason we can't make one-off scripting convenient in Clojure. The specific example you raised (deploying one-off scripts) could be addressed by a standard launcher. Several have been written, and we need to take the simplest design and include it in Clojure. There is already a ticket for this: https://www.assembla.com/spaces/clojure/tickets/366-multiplatform-command-line-clojure-launcher, and I would love to see it in the next release. That said, your example was one representative example of a general problem. Inconvenience bubbles up from the Java ecosystem in many places. Fortunately, these inconveniences are easier to fix in Clojure that elsewhere, since Clojure is such a simple language. :-) Bingo. I think it's deeper than that. The reason that the Unix version is so simple isn't just a simple launcher script, or the #! hack, or any one things. It's that simple things should be simple is axiomatic for those tools (I'm not sure which came first - the software tools project or unix, but they both share this philosophy, and software tools project ran on damn near everything when they were still supported). All those things derive from that philosophy, and combine to make simple things simple. I.e. - someone claimed that this boils down to not being able to tweak CLASSPATH in the program. Well, that would help, but it's not quite enough. Most simple/simple programs don't have to tweak their search path for loadable modules, because - no matter where they are running - the default path to look for loadable modules includes the current directory, possibly the directory the application was launched from, and the appropriate library directory for that installation of the system. Which means that 95% of the time, you don't have to worry about the path at all. Simple things - loading standard modules (even if they're optional), loading application-specific modules, or even invocation-specific modules - are simple, because the appropriate elements are *already* in the search path. Ditto for compiled binaries: if they're built properly, they know where to find all their shard libraries, and you don't have to muck about with LD_LIBRARY_PATH. The default CLASSPATH is ., so to do anything more complicated than running a .class file from the current directory (and really - how often do you do that?) you have to do something complicated. Ok, fixing this in clojure would require the ability to change the class path - or a smarter classloader - that looked in the right places to start with. So that ability is a first step in this direction. mike -- Mike Meyer m...@mired.org http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information. O ascii ribbon campaign - stop html mail - www.asciiribbon.org -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
Why not explicitly feed the macro the keyword map if that is what it wants? (defmacro ultra-synth [prefix keywords] (let [symbols (map (comp symbol name) keywords) fn-names (map (comp symbol (partial str prefix) name) keywords) defn-forms (map (fn [fn-name symbol] `(defn ~fn-name [n#] (= n# ~symbol))) fn-names symbols)] `(do ~...@defn-forms))) thunderbolt.play (def a 5) #'thunderbolt.play/a thunderbolt.play (def b 5) #'thunderbolt.play/b thunderbolt.play (ultra-synth hi [:a :b]) #'thunderbolt.play/hib thunderbolt.play (hia 5) true --Robert McIntyre On Fri, Sep 10, 2010 at 6:17 PM, Alan a...@malloys.org wrote: PS this is super-ugly and I'm always embarrassed when I find myself using eval in a lisp. While this works, I'd love it if someone could tell me how to do it with macros. On Sep 10, 3:07 pm, Alan a...@malloys.org wrote: I see. It's hard to imagine how this could work, since macros don't have access to runtime data like the value of x in your example. Perhaps you're better off writing a function that returns a closure, and iteratively def'ing those? user= (defn make-kw-fn [kw] #(= kw %)) #'user/make-kw-fn user= (def kws [:a :b]) #'user/kws user= (eval (cons 'do (map #(list 'def (symbol (str test- (name %))) (make- kw-fn %)) kws))) #'user/test-b user= (test-b :a) false user= (test-b :b) true On Sep 10, 1:37 pm, icemaze icem...@gmail.com wrote: Alan, thank you for your reply. Unfortunately your solution is very similar to mine and it suffers from the same problem (maybe I'm using it incorrectly, I don't know). If I write: (doseq [x '(:a :b)] (make-fn x)) it defines a single function synthetic-x. Is there a way to make this work? I tried everything but both eval and var-get don't work for local bindings. Thanks again. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
It sounds like he's going to be given the list of keywords by the user, and won't have it as a compile-time literal. Maybe he's load'ing a .clj file, for example, that someone will write in the future. Maybe you can combine our two approaches to get something that works and isn't ugly, but I'm having a hard time finding it. (def) requires a symbol as its first argument, and is a macro so needs it at compile time. The best I can do is: (defmacro buildfn [name] `(defn ~name [arg#] 10)) (doseq [k '[a b c]] (eval `(buildfn ~k))) On Sep 10, 4:20 pm, Robert McIntyre r...@mit.edu wrote: Why not explicitly feed the macro the keyword map if that is what it wants? (defmacro ultra-synth [prefix keywords] (let [symbols (map (comp symbol name) keywords) fn-names (map (comp symbol (partial str prefix) name) keywords) defn-forms (map (fn [fn-name symbol] `(defn ~fn-name [n#] (= n# ~symbol))) fn-names symbols)] `(do ~...@defn-forms))) thunderbolt.play (def a 5) #'thunderbolt.play/a thunderbolt.play (def b 5) #'thunderbolt.play/b thunderbolt.play (ultra-synth hi [:a :b]) #'thunderbolt.play/hib thunderbolt.play (hia 5) true --Robert McIntyre On Fri, Sep 10, 2010 at 6:17 PM, Alan a...@malloys.org wrote: PS this is super-ugly and I'm always embarrassed when I find myself using eval in a lisp. While this works, I'd love it if someone could tell me how to do it with macros. On Sep 10, 3:07 pm, Alan a...@malloys.org wrote: I see. It's hard to imagine how this could work, since macros don't have access to runtime data like the value of x in your example. Perhaps you're better off writing a function that returns a closure, and iteratively def'ing those? user= (defn make-kw-fn [kw] #(= kw %)) #'user/make-kw-fn user= (def kws [:a :b]) #'user/kws user= (eval (cons 'do (map #(list 'def (symbol (str test- (name %))) (make- kw-fn %)) kws))) #'user/test-b user= (test-b :a) false user= (test-b :b) true On Sep 10, 1:37 pm, icemaze icem...@gmail.com wrote: Alan, thank you for your reply. Unfortunately your solution is very similar to mine and it suffers from the same problem (maybe I'm using it incorrectly, I don't know). If I write: (doseq [x '(:a :b)] (make-fn x)) it defines a single function synthetic-x. Is there a way to make this work? I tried everything but both eval and var-get don't work for local bindings. Thanks again. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
Yeah, I guess I could use a macro to generate the call to the other macro in a way similar to how you used it. Thank you, that should definitely work. I'll try it right now. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
there's always apply-macro from contrib for doing perverse stuff like that, so you don't have to *see* eval if you don't want to :) --Robert McIntyre On Fri, Sep 10, 2010 at 8:24 PM, icemaze icem...@gmail.com wrote: I agree: eval never looks pretty. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
Yes, I think I'll have to pass the keywords as literals. I don't think there's a way around that (other than using eval, as per Alan's solution). I was too excited about Hubert's hint and I found myself in the exact same problem with the second macro. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
You are mostly right in your assumptions: I could dump the keywords in the clj as literals but it would be tedious and not elegant at all. Eval's not pretty but it works; plus it's there for a reason, like working around the shortcomings of the language (and of my brain). I was about to post my solution but I won't, since it looks exactly like yours. Thank you guys for your efforts! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
This is probably not the prettiest way to do it, but I think it gets the job done: (defn make-sym [keyword] (- keyword name (str prefix-) symbol)) (defn make-fn [keyword] (let [n (gensym)] (list 'defn (make-sym keyword) [n] (list '= n keyword (defmacro make-fns [keywords] `(do ~@(map make-fn keywords))) user= (make-fns [:a :b :c]) #'user/prefix-c user= (prefix-a :a) true user= (prefix-a :x) false user= (prefix-b :b) true user= (prefix-b :x) false user= (prefix-c :c) true user= (prefix-c :x) false The credit belongs to Alan, and Mr. Stuart Halloway for his examples from Ch. 7 of Programming Clojure. On Sep 10, 2:37 pm, icemaze icem...@gmail.com wrote: Alan, thank you for your reply. Unfortunately your solution is very similar to mine and it suffers from the same problem (maybe I'm using it incorrectly, I don't know). If I write: (doseq [x '(:a :b)] (make-fn x)) it defines a single function synthetic-x. Is there a way to make this work? I tried everything but both eval and var-get don't work for local bindings. Thanks again. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Problem importing JOptionPane from a string evaluated by load-string
On 9/10/10 9:03 AM, Laurent PETIT wrote: Got it. You cannot invoke (import) (or (ns)) from within the function definition. The function is already being evaluated, and it's too late. This works fine for me: (do (import '(javax.swing JOptionPane)) ((fn [] (println Hello World) (println (+ 2 2)) (JOptionPane/showMessageDialog nil Hello from the text panel Greeting JOptionPane/INFORMATION_MESSAGE So be aware that then some namespace will be changed by the call to import (side effect on *ns*). I would suggest either you create a temporary namespace for the code to execute, either as Sean suggested, you write the call to JOptionPane static methods and fields fully qualified: (javax.swing.JOptionPane/showMessageDialog ...) I see, those are good suggestions that help me better understand what is going on with namespaces. I can remember now in my work that I had other errors related to where I placed an import statement in the base code that I had resolved by pulling them out of a function (not really understanding then what worked, because at the same time I changed the form of it). Strangely, when I click on Update code to evaluate that code it popped up the JOptionPane right away. I would think it would have not done that, because I was trying to return an anonymous function I could bind to the button action. And then Click Me! to actually call the function produces an error. Exception in thread AWT-EventQueue-0 java.lang.NullPointerException at org.pointrel.guitest2$hookupActionPerformed$fn__54.invoke(guitest2.clj:13) at org.pointrel.guitest2.proxy$java.lang.Object$ActionListener$46793e3a.actionPerformed(Unknown Source) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882) I'm presuming that (do ...) returns nil and so the nil gets bound instead of a function and that causes the error. I just removed a set of parens that caused the anonymous fn to evaluate during the load-string call, and now it works the way I wanted to. I can't say the GUI design was very self-explanatory, so I can see how you might have thought success was different then I expected. :-) This is the variant that works the way I wanted: (do (import '(javax.swing JOptionPane)) (fn [] (println Hello World) (println (+ 2 2)) (JOptionPane/showMessageDialog nil Hello from the text panel Greeting JOptionPane/INFORMATION_MESSAGE))) And this works also with the complete path as Sean suggested: (fn [] (println Hello World) (println (+ 2 2)) (JOptionPane/showMessageDialog nil Hello from the text panel2 Greeting javax.swing.JOptionPane/INFORMATION_MESSAGE)) So, my thanks go to you and Sean, for two different solutions. :-) I'll need to look more into that namespace thing. I'm more used to Python/Jython recently where you can import stuff wherever you want (suboptimally if done in a frequently called function, of course). Obviously, I can see a functional language making different tradeoffs. Anyway, I've just been noodling around in terms of what it would take to build an interactive GUI building system where you could easily change how some of the system worked at run-time as a sort of rapid prototyping (like Smalltalk systems usually can do). This amount of code seems to be the bare bones to doing that (at least as a proof-of-concept), so thanks again for the solutions. I know there are other Clojure GUI building stuff out there, already; I was just starting playing with something interesting to show the power and elegance of Clojure. :-) --Paul Fernhout http://www.pdfernhout.net/ The biggest challenge of the 21st century is the irony of technologies of abundance in the hands of those thinking in terms of scarcity. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Improved stack traces
I found when working on ticket 191 (dead now, I suppose) that counting the stack elements is not reliable, but = works to get rid of duplicates. Below you can compare java's to your new function - the clojure has one duplicate element (the very last one). Also, I find the ... useful to know something is cut off. root-cause is too generic of a name since it only strips out CompileException. Will clojure.stacktrace be deprecated or patched to use this implementation? My patch for 191 includes test code if you want to adjust it for this. -Mike user= (.printStackTrace *e) java.lang.Exception: Unable to resolve symbol: x in this context, compiling:(NO_SOURCE_FILE:0) at clojure.lang.Compiler.analyze(Compiler.java:5777) at clojure.lang.Compiler.analyze(Compiler.java:5723) at clojure.lang.Compiler.eval(Compiler.java:6002) at clojure.lang.Compiler.eval(Compiler.java:5965) at clojure.core$eval.invokeStatic(core.clj:2652) at clojure.core$eval.invoke(core.clj) at clojure.main$repl$read_eval_print__5766.invoke(main.clj:177) at clojure.main$repl$fn__5771.invoke(main.clj:198) at clojure.main$repl.doInvoke(main.clj:198) at clojure.lang.RestFn.invoke(RestFn.java:422) at clojure.main$repl_opt.invoke(main.clj:256) at clojure.main$main.doInvoke(main.clj:349) at clojure.lang.RestFn.invoke(RestFn.java:398) at clojure.lang.Var.invoke(Var.java:361) at clojure.lang.AFn.applyToHelper(AFn.java:159) at clojure.lang.Var.applyTo(Var.java:482) at clojure.main.main(main.java:37) Caused by: java.lang.Exception: Unable to resolve symbol: x in this context at clojure.lang.Compiler.resolveIn(Compiler.java:6251) at clojure.lang.Compiler.resolve(Compiler.java:6195) at clojure.lang.Compiler.analyzeSymbol(Compiler.java:6158) at clojure.lang.Compiler.analyze(Compiler.java:5744) ... 16 more nil user= (pst *e 40) CompilerException java.lang.Exception: Unable to resolve symbol: x in this context, compiling:(NO_SOURCE_FILE:0) clojure.lang.Compiler.analyze (Compiler.java:5777) clojure.lang.Compiler.analyze (Compiler.java:5723) clojure.lang.Compiler.eval (Compiler.java:6002) clojure.lang.Compiler.eval (Compiler.java:5965) clojure.core/eval (core.clj:2652) clojure.core/eval (core.clj:-1) clojure.main/repl/read-eval-print--5766 (main.clj:177) clojure.main/repl/fn--5771 (main.clj:198) clojure.main/repl (main.clj:198) clojure.main/repl-opt (main.clj:256) clojure.main/main (main.clj:349) clojure.lang.Var.invoke (Var.java:361) clojure.lang.Var.applyTo (Var.java:482) clojure.main.main (main.java:37) Caused by: Exception Unable to resolve symbol: x in this context clojure.lang.Compiler.resolveIn (Compiler.java:6251) clojure.lang.Compiler.resolve (Compiler.java:6195) clojure.lang.Compiler.analyzeSymbol (Compiler.java:6158) clojure.lang.Compiler.analyze (Compiler.java:5744) clojure.lang.Compiler.analyze (Compiler.java:5723) nil -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Generating functions programmatically
That is very elegant but has the exact same problem in that the macro must be called on a literal vector of keywords. --Robert McIntyre On Fri, Sep 10, 2010 at 5:41 PM, Btsai benny.t...@gmail.com wrote: This is probably not the prettiest way to do it, but I think it gets the job done: (defn make-sym [keyword] (- keyword name (str prefix-) symbol)) (defn make-fn [keyword] (let [n (gensym)] (list 'defn (make-sym keyword) [n] (list '= n keyword (defmacro make-fns [keywords] `(do ~@(map make-fn keywords))) user= (make-fns [:a :b :c]) #'user/prefix-c user= (prefix-a :a) true user= (prefix-a :x) false user= (prefix-b :b) true user= (prefix-b :x) false user= (prefix-c :c) true user= (prefix-c :x) false The credit belongs to Alan, and Mr. Stuart Halloway for his examples from Ch. 7 of Programming Clojure. On Sep 10, 2:37 pm, icemaze icem...@gmail.com wrote: Alan, thank you for your reply. Unfortunately your solution is very similar to mine and it suffers from the same problem (maybe I'm using it incorrectly, I don't know). If I write: (doseq [x '(:a :b)] (make-fn x)) it defines a single function synthetic-x. Is there a way to make this work? I tried everything but both eval and var-get don't work for local bindings. Thanks again. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
