Re: Clojure at JavaOne
I have a one pagish program that you pass in your screen resolution and it randomly picks out a new desktop image from ftp.gnome.org, downloads the image and updates your desktop. This assumes your using Gnome. http://github.com/heyZeus/clojure-stuff/blob/0c81123fcb3dc4bafa0df94b6e32dc49729595d3/update-desktop-image.clj On Fri, May 22, 2009 at 5:33 AM, Rich Hickey richhic...@gmail.com wrote: On May 22, 7:16 am, Rich Hickey richhic...@gmail.com wrote: On May 21, 11:38 pm, Adrian Cuthbertson adrian.cuthbert...@gmail.com wrote: ... impact part can be merged with the business application mindset by generating a report that includes the data visualization (I think PDF generation is built into processing). I've been doing some work with enlive and XHtmlRenderer - it's a pretty awesome way of generating (business, media, etc) PDF docs from html templates, css style sheets and clojure generated data. I could post some examples if there's any interest. Sure, please do. Actually, let me extend that invitation - if anyone's got a small (one-page-ish) Clojure program that does something interesting, and are willing to have it demonstrated at JavaOne, please paste it somewhere and post a note here. Thanks, Rich --~--~-~--~~~---~--~~ 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 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: HTTP clients in clojure
I wrote clj-web-crawler which wraps the Apache commons client library and made it suck a little bit less. I haven't tested it out with the Clojure 1.0 release just yet, but I'll do that tonight. http://github.com/heyZeus/clj-web-crawler/tree/master On Wed, May 6, 2009 at 7:16 PM, Chris Dean ctd...@sokitomi.com wrote: Eric Tschetter eched...@gmail.com writes: Last I checked the various clojure libraries, it seemed like noone has publicized a set of wrappers/clojure-native implementation of an http client. There is (slurp* url) and (reader url) in clojure.contrib.duck-streams (count (slurp* http://google.com;)) = 4675 Cheers, Chris Dean --~--~-~--~~~---~--~~ 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 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 Library
I posted this a couple of weeks ago and haven't seen it updated on the clojure website. Maybe it got lost in the shuffle. Name: clj-web-crawler URL: http://github.com/heyZeus/clj-web-crawler/tree/master Author: Brian Doyle Categories: Web, Automation License: MIT Dependencies: clojure, clojure-contrib, Apache commons-client 3.1 Description: clj-web-crawler is a wrapper around the Apache commons-client Java library that allows you to easily crawl the web in a functional way. --~--~-~--~~~---~--~~ 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 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: Got a Clojure library?
Name: clj-web-crawler URL: http://github.com/heyZeus/clj-web-crawler/tree/master Author: Brian Doyle Categories: Web, Automation License: MIT Dependencies: clojure, clojure-contrib, Apache commons-client 3.1 Description: clj-web-crawler is a wrapper around the Apache commons-client Java library that allows you to easily crawl the web in a functional way. On Wed, Apr 8, 2009 at 9:16 AM, Rich Hickey richhic...@gmail.com wrote: Added - thanks! Rich On Apr 8, 2009, at 3:43 AM, Remco van 't Veer wrote: Name: clj-android URL: http://github.com/remvee/clj-android/ Author: Remco van 't Veer Categories: android framework License: MIT Dependencies: clojure Description: Basic application framework for building Android applications using Clojure. --~--~-~--~~~---~--~~ 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 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] clojuredev 0.0.30 released
If I wanted to download and play with clojuredev where would I find it? On Sat, Apr 4, 2009 at 3:58 PM, Laurent PETIT laurent.pe...@gmail.comwrote: New release, with a lot of changes! I would particularly like to thank Stephan Mühlstrasser for his contributions ! The clojure symbols omni-completion feature was also quickly made available thanks to Meikel Brandmeyer's help and code :-) IMPORTANT NOTE: the layouts of the plugins that host clojure and clojure-contrib code have changed. So for your projects that use the out-of-the-box versions of these jars, you may have to manually fix it: go to the project's context menu Properties Java Build Path Libraries. Remove the clojure and clojurecontrib classes directories. Instead, add external jars for clojure and clojurecontrib, located in your eclipse plugins directory : %ECLIPSE_HOME%/plugins/clojure/clojure.jar and %ECLIPSE_HOME%/plugins/clojurecontrib/clojure-contrib.jar Below the list of changes: 1. User visible changes 1.a) new features * Patch from Stephan Mühlstrasser * inheritance of standard editorpreferences * user-editable preferences * Currently you can switch on and off the bracket matching, and change the tab width * Added an (configurable via preferences) auto-switch to the loaded file namespace when a REPL is launched via the selection of a file (uses the last found ns call in the file) * Change of the default REPL to use clojure.contrib.repl_ln * Enhancement of the syntax coloring: * more colorized types of symbols * now defaults to colors similar to those used by emacs clojure mode * uses a dynamically created symbol table for clojure core symbols (special symbols, macros, functions) for coloring clojure symbols * code completion : * added omni-completion on clojure symbols (e.g. w-o resolves to with-out) * added limits to the search to prevent the IDE from hanging too long: * prefix must not be less than 3 characters * java search halts if more than 200 results are matched (only those 200 results are proposed, with a warning message at the bottom of the completion box) 1.b) bug fixed * the namespace browser now sorts namespace names and symbol names by natural ascending order 2. Technical changes * Tweaked the settings of clojure, clojurecontrib and clojuredev Eclipse plugins to enable clojure's driven clojuredev code by adding buddy policy (registered) * Made code sent to the REPL more robust (namespace qualify the used symbols) Enjoy ! --~--~-~--~~~---~--~~ 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 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 -~--~~~~--~~--~--~---
advice needed converting large files to xml
I've been using Clojure for about 6 months now and really like it. I am somewhat new to multi-threading and using any of the parallel features in Clojure though. I have a situation where I need to convert 7 files from CSV to XML. Each one of these files is about 180MB apiece in size. I have dual core machine with 2GB of RAM and would like some advice on the best strategy for processing these files in a way that really utilizes both cores and my memory to really speed up the processing.I'm sure this isn't the best way, but I've only come up with starting up two threads at first, having each thread open up a file, call line-seq on that file, write out the XML for each line and then go to the next file when it's complete. Any advice would be great. 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 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: advice needed converting large files to xml
On Mon, Mar 16, 2009 at 4:21 PM, Stu Hood stuh...@gmail.com wrote: If you write your CSV - XML processing as a function, you could pmap ( http://clojure.org/api#pmap) that function across the list of input files. pmap will transparently create the threads as needed, and it will probably be enough to saturate your disk. Thanks, Stu Stu, I just want to make sure I understand what you are saying here. Would it look something like this: (pmap (fn [input-file] ; open input for reading ; open output for writing ; read line ; process line ; write line ) [input-file1, input-file2, input-file3, ]) Thanks. On Mon, Mar 16, 2009 at 5:56 PM, Brian Doyle brianpdo...@gmail.comwrote: I've been using Clojure for about 6 months now and really like it. I am somewhat new to multi-threading and using any of the parallel features in Clojure though. I have a situation where I need to convert 7 files from CSV to XML. Each one of these files is about 180MB apiece in size. I have dual core machine with 2GB of RAM and would like some advice on the best strategy for processing these files in a way that really utilizes both cores and my memory to really speed up the processing.I'm sure this isn't the best way, but I've only come up with starting up two threads at first, having each thread open up a file, call line-seq on that file, write out the XML for each line and then go to the next file when it's complete. Any advice would be great. 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 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: advice needed converting large files to xml
On Mon, Mar 16, 2009 at 4:29 PM, Mark Volkmann r.mark.volkm...@gmail.comwrote: On Mon, Mar 16, 2009 at 4:56 PM, Brian Doyle brianpdo...@gmail.com wrote: I've been using Clojure for about 6 months now and really like it. I am somewhat new to multi-threading and using any of the parallel features in Clojure though. I have a situation where I need to convert 7 files from CSV to XML. Each one of these files is about 180MB apiece in size. I have dual core machine with 2GB of RAM and would like some advice on the best strategy for processing these files in a way that really utilizes both cores and my memory to really speed up the processing.I'm sure this isn't the best way, but I've only come up with starting up two threads at first, having each thread open up a file, call line-seq on that file, write out the XML for each line and then go to the next file when it's complete. Any advice would be great. Thanks. Most libraries that write XML build a data structure to represent the XML and then write it out. That doesn't work for writing out large XML documents because you'll run out of memory before you finish building the data structure. I don't know if there is a Clojure library that writes XML as you specify it. If there isn't then you should consider WAX, a Java library I wrote. You can learn more about it at http://ociweb.com/wax/. You could use it from Clojure. Check out the tutorial. It's a really simple library, it's really fast and it's very memory efficient! Mark, WAX looks really nice! I'll look around in Clojure some more about writing XML but if I don't find anything to my linking I'll give WAX a go. Thanks! -- R. Mark Volkmann Object Computing, Inc. --~--~-~--~~~---~--~~ 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 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 -~--~~~~--~~--~--~---
clj-web-crawler
I wrote a Clojure script that wraps the Apache commons-client library for crawling the web. It's a simple 125 line script and I also wrote some test cases for it as well. I was wondering if this is something that could/should be included in clojure.contrib or if it should be a standalone Clojure library? The code is here if you want to check it out: http://github.com/heyZeus/clj-web-crawler/tree/master --~--~-~--~~~---~--~~ 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 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: sequences from Enumerations
I had the same issue and ended up having to use enumeration-seq function. Seems strange but it worked. On Mon, Mar 2, 2009 at 4:22 PM, Mark Volkmann r.mark.volkm...@gmail.comwrote: Should I be able to do something like this? (doseq [table-column (- jtable .getColumnModel .getColumns)] javax.swing.JTable has a getColumnModel method that returns a TableColumnModel. TableColumnModel has a getColumns method that returns EnumerationTableColumn. I was hoping that would automatically be treated as a sequence, but I get java.lang.IllegalArgumentException: Don't know how to create ISeq from: -- R. Mark Volkmann Object Computing, Inc. --~--~-~--~~~---~--~~ 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 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: sequences from Enumerations
That makes sense now. Thanks for the link to the thread. On Mon, Mar 2, 2009 at 5:01 PM, Stephen C. Gilardi squee...@mac.com wrote: On Mar 2, 2009, at 6:37 PM, Brian Doyle wrote: I had the same issue and ended up having to use enumeration-seq function. Seems strange but it worked. The seq function is not able to provide a seq on either an Enumeration or an Iterator. clojure.core provides enumeration-seq and iterator-seq to create seqs on them. The rationale for this is contained in this thread: http://groups.google.com/group/clojure/browse_thread/thread/decbd098646353c/7a78ebf588bf0f7e?lnk=gstq=iterator-seq#7a78ebf588bf0f7e --Steve --~--~-~--~~~---~--~~ 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 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: Importing lots of Java classes at once
I wrote something similar to what you are asking about. My code does not import java class files but calls 'use' on clojure files that live in the clojure-contrib.jar file. I load this when I start the REPL only. (defn name-to-symbol [lib-name] Converts the lib-name to a symbol (- lib-name (.replaceFirst .clj$ ) (.replaceAll _ -) (.replaceAll / .) (symbol))) (defn contrib-ns [jar] Returns a seq of symbols from the clojure.contrib package, is not recursive (for [f (map #(.getName %) (enumeration-seq (.entries (java.util.zip.ZipFile. jar :when (and (.endsWith f clj) (= 3 (count (.split f /))) (not (or (.endsWith f test_clojure.clj) (.endsWith f test_contrib.clj] (name-to-symbol f))) ;sets the variable to the colure-contrib.jar path, otherwise nil (def contrib-jar (if-let [url (.getResource (ClassLoader/getSystemClassLoader) clojure-contrib.jar)] (.getFile url))) (defn use-contribs [] Calls the use function on every clj file in the clojure.contrib package. Not every clj file can be loaded because of function name clashes with the core. (if contrib-jar (println (str use (reduce (fn [ret n] (try (use n) (conj ret n) (catch Exception _ ret))) [] (contrib-ns contrib-jar)) On Fri, Feb 20, 2009 at 10:48 PM, Jason Wolfe jawo...@berkeley.edu wrote: I have a horrible hack to do this, which uses even more appalling code than [2] ripped off from a different forum, but which (in my limited experience) seems to work OK. I'll email it to you privately, and to anyone else who wants to use it (just ask). -Jason On Feb 20, 9:33 pm, Brian Carper briancar...@gmail.com wrote: One could argue that wildcard imports in Java (import package.*) are evil, pollute your namespaces, create potential naming conflicts, etc. One would probably be correct. One could also argue that having to manually type a list of dozens of classnames is pretty tedious, especially if all you want to do is goof off at a REPL for a few minutes. e.g. I wanted to run some SWT snippets [1], and to import all the necessary SWT classes into Clojure can be a bit of a pain. I found this somewhat appalling bit of code [2] which I can use to get a list of all the classnames in some package and then import them all that way. There are all kinds of ways that code can fail though. Does anyone else have a way that they routinely import lots and lots of Java classes at once? I don't care how dirty a hack it is, I'm not going to do this in production code. I only want to save my fingers a bit of typing. I know this probably isn't planned [3] for Clojure, just looking for the best workaround. [1]:http://www.eclipse.org/swt/snippets/ [2]:http://forums.sun.com/thread.jspa?threadID=341935start=30tstart=0 [3]: http://groups.google.com/group/clojure/browse_thread/thread/c65e19d51... --~--~-~--~~~---~--~~ 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 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: Newbie: Separating and grouping the elements in a bunch of vectors
From the original question it looked like there was a vector of unknown length of vectors [[a0 a1 a2] [b0 b1 b2] ...] So my solution is something like: 1:12 user= (def vecs [[:a0 :a1 :a2] [:b0 :b1 :b2]]) #'user/vecs 1:13 user= (partition (count vecs) (interleave (flatten vecs))) ((:a0 :a1) (:a2 :b0) (:b1 :b2)) This doesn't return a sequence of vectors and just a sequence of sequences. I'm sure it can be done, but it's not clear to me if you have a vector of vectors how Stuart's solution would work: 1:15 user= (map vector vecs) ([[:a0 :a1 :a2]] [[:b0 :b1 :b2]]) On Sun, Feb 15, 2009 at 7:54 PM, David Nolen dnolen.li...@gmail.com wrote: Of course ;) Keep forgetting the obvious things. On Sun, Feb 15, 2009 at 9:36 PM, Stuart Halloway stuart.hallo...@gmail.com wrote: (map vector [1 2 3] ['a 'b 'c] [cat dog bird]) - ([1 a cat] [2 b dog] [3 c bird]) Actually something closer to your exact expression is this: (apply (partial map (fn [ rest] (apply vector rest))) [[1 2 3] ['a 'b 'c] [cat dog bird]]) On Sun, Feb 15, 2009 at 7:42 PM, David Nolen dnolen.li...@gmail.com wrote: (map (fn [ rest] (apply vector rest)) [1 2 3] ['a 'b 'c] [cat dog bird]) On Sun, Feb 15, 2009 at 7:16 PM, samppi rbysam...@gmail.com wrote: What would I do if I wanted this: [[a0 a1 a2] [b0 b1 b2] ...] - [[a0 b0 ...] [a1 b1 ...] [a2 b2 ...]] I could write a loop, I guess, but is there a nice, idiomatic, functional way of doing this? I didn't spot a way in clojure.contrib.seq-utils either. --~--~-~--~~~---~--~~ 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 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: Denver/Boulder Clojure users
I live in southeast Denver and have been doing some Clojure on my own for a few months now. On Thu, Feb 5, 2009 at 12:39 PM, chris cnuern...@gmail.com wrote: Are there any existing clojure users in the Denver/Boulder area (other than me)?. Chris --~--~-~--~~~---~--~~ 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 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: symbols, vars and namespaces
On Tue, Jan 27, 2009 at 7:43 AM, Chouser chou...@gmail.com wrote: On Tue, Jan 27, 2009 at 8:51 AM, Mark Volkmann r.mark.volkm...@gmail.com wrote: Are these statements correct? Actually, I know some are correct because I just looked though the source. Hopefully others that haven't will find this interesting. Symbol objects have a String name and a String namespace name, but no value. Var objects have references to a Symbol object, a Namespace object and an Object object which is its root value. Namespace objects have a reference to a Map that holds associations between Symbol objects and Var objects. In Clojure, the term interning typically refers to adding a Symbol-to-Var mapping to a Namespace. Those all sound right to me, with the (very minor) caveat that Namespaces also have a aliases map. Why don't Symbol objects have a reference to a Namespace object instead of a String that is a Namespace name? The namespace part of a symbol doesn't have to refer to any existing namespace. This is useful for example when using the symbol as its own value. user= (namespace 'foo/bar) foo The namespace part can even be 'nil', which is probably the most common case for symbols created by the reader: user= (def expr (read (java.io.PushbackReader. (java.io.StringReader. (+ 1 2) user= (first expr) + user= (namespace (first expr)) nil This nil namespace seems a bit odd. Wasn't expr created in the user namespace? Or even just: user= (namespace 'zipmap) nil --Chouser --~--~-~--~~~---~--~~ 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 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: *1 *2 isn't working properly
Here's an example of *1 *2 *3 1:1 user= (str gavin) gavin 1:2 user= (str teri) teri 1:3 user= (str brian) brian 1:4 user= (str-join [*1 *2 *3]) brian teri gavin On Wed, Jan 14, 2009 at 2:29 AM, Stephen C. Gilardi squee...@mac.comwrote: By the time you evaluated *2, the second most recent result was what it showed you. All top level evaluations count. In short, you were Heisenberged. --Steve On Jan 14, 2009, at 3:59 AM, HB hubaghd...@gmail.com wrote: Hey, I'm trying to run my first Clojure example user= (defn hello [name] (str Cool! name)) #'user/hello user= (hello Google) Cool! Google user= (hello Wicket) Cool! Wicket user= (str *1) Cool! Wicket user= (str *2) Cool! Wicket Isn't (str *2) supposed to return Cool! Google ? Environment: Clojure20081217 Ubuntu 8.04 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 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: Setting a value inside a map of map of maps...
I think you can just use the update-in function like:
1:1 user= (def m {:a {:b {:c {:d 3)
#'user/m
1:2 user= (update-in m [:a :b :c :d] - 5)
{:a {:b {:c {:d -2
On Sun, Jan 11, 2009 at 11:08 AM, CuppoJava patrickli_2...@hotmail.comwrote:
Hi,
I'm just wondering if there's a clever way of creating a new map from
an existing map of map of maps.. with a key deep inside altered.
ie. given this map: {:a {:b {:c {:d 3
i want to create a new map, with the value at :d increased by 5.
I wrote a macro to do this, but it's quite ugly.
Thanks for the tip
-Patrick
--
In case this helps at all, this is the macro that I wrote.
Usage: (set_map mymap [:a :b :c :d] (+ it 5))
(defmacro -set_map [mymap mykeys expr]
(let [syms (take (dec (count mykeys))
(repeatedly gensym))
bindings (interleave
(concat syms ['it])
(map list
mykeys
(concat [mymap] syms)))]
`(let [...@bindings]
~((fn assoc_fn [maps keys expr]
(if (empty? keys)
expr
`(assoc ~(first maps) ~(first keys)
~(assoc_fn (rest maps) (rest keys) expr
(concat [mymap] syms) mykeys expr
(defmacro set_map [map keys expr]
`(let [map# ~map]
(-set_map map# ~keys ~expr)))
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Re: How can I find all files ending with .clj, for example
Here's one of many ways to do this: (filter #(.endsWith (.getName %1) .clj ) (file-seq (java.io.File. .))) On Thu, Jan 8, 2009 at 5:48 PM, wubbie sunj...@gmail.com wrote: Hi all, I can use file-seq (file-seq (File. .)) But how can I filter out all files ending with .clj? Do we use re-find, re-seq etc? thanks sun --~--~-~--~~~---~--~~ 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 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 -~--~~~~--~~--~--~---
writing bytes to a file
I couldn't find anything in core or contrib that wrote out bytes to a file so I wrote something to do it. Is this functionality already implemented and I just couldn't find it? If there isn't anything already, would this be something good to put in contrib somewhere? Thanks. (defn write-bytes Writes the bytes from the in-stream to the given filename. [#^java.io.InputStream in-stream #^String filename] (with-open [out-stream (new FileOutputStream filename)] (let [buffer (make-array (Byte/TYPE) 4096)] (loop [bytes (.read in-stream buffer)] (if (not (neg? bytes)) (do (.write out-stream buffer 0 bytes) (recur (.read in-stream buffer --~--~-~--~~~---~--~~ 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 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: writing bytes to a file
Looks like spit is for printing just text. On Wed, Jan 7, 2009 at 12:20 PM, Paul Barry pauljbar...@gmail.com wrote: clojure.contrib.duck_streams/spit? On Wed, Jan 7, 2009 at 2:14 PM, Brian Doyle brianpdo...@gmail.com wrote: I couldn't find anything in core or contrib that wrote out bytes to a file so I wrote something to do it. Is this functionality already implemented and I just couldn't find it? If there isn't anything already, would this be something good to put in contrib somewhere? Thanks. (defn write-bytes Writes the bytes from the in-stream to the given filename. [#^java.io.InputStream in-stream #^String filename] (with-open [out-stream (new FileOutputStream filename)] (let [buffer (make-array (Byte/TYPE) 4096)] (loop [bytes (.read in-stream buffer)] (if (not (neg? bytes)) (do (.write out-stream buffer 0 bytes) (recur (.read in-stream buffer --~--~-~--~~~---~--~~ 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 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: Very noob file reading and printing question
On Tue, Jan 6, 2009 at 4:47 PM, Tom Ayerst tom.aye...@gmail.com wrote: Its not the println, nor getting a reader (duckstreams is fine, I can do that). Its the converting it to a seq and stepping through it printing each element (which should be a line). Its the loopy, steppy bit, just for a side effect; that I am messing up. Cheers Tom I've done this type of thing and it worked great for me. (with-open [r (clojure.contrib.duck-streams/reader filename.txt)] (doseq [line (line-seq r)] ; do stuff with the line here )) Basically you'll want to use the line-seq function. Hopefully that helps. 2009/1/6 Mark Volkmann r.mark.volkm...@gmail.com On Tue, Jan 6, 2009 at 5:26 PM, Tom Ayerst tom.aye...@gmail.com wrote: Hi, How do I read and print a text file? I can read it, its the printing that is the problem, I feel it should be obvious but I keep tripping myself up. (The context is I need to extract data line by line, translate the line format and save it for a legacy app) Do you just need to print to stdout? The println function does that. It puts a space between the output of each of its arguments. If you don't want that you can use the str function to concatenate a bunch of string values together. If you need something fancier, don't forget that you can access everything in java.io from Clojure. -- R. Mark Volkmann Object Computing, Inc. --~--~-~--~~~---~--~~ 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 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 code review for clj-record?
Looks good. I didn't know about the *file* var. On Sun, Jan 4, 2009 at 11:22 AM, John D. Hume duelin.mark...@gmail.comwrote: Brian, I incorporated your changes and then made changes to load and run all clj_record/test/*-test.clj files. Thanks again. -hume. --~--~-~--~~~---~--~~ 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 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 -~--~~~~--~~--~--~---
finding all vars starting with *
Today I found out about the var *file*. I looked it up *file* on clojure.com/api and couldn't find anything. Is there some place where all of these vars are defined? Is there some way programatically I can find them all? 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 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 code review for clj-record?
John, I was looking at the validates method and I had a thought I'd bounce off you. Instead of just returning a hash of errors what about returning the record with the errors hash in the metadata? That way you just have the data and the errors in one object similar to an ActiveRecord model. On Sun, Jan 4, 2009 at 2:22 PM, Brian Doyle brianpdo...@gmail.com wrote: Looks good. I didn't know about the *file* var. On Sun, Jan 4, 2009 at 11:22 AM, John D. Hume duelin.mark...@gmail.comwrote: Brian, I incorporated your changes and then made changes to load and run all clj_record/test/*-test.clj files. Thanks again. -hume. --~--~-~--~~~---~--~~ 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 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 code review for clj-record?
John, I was looking around at your tests just to get a feel for using the test-is stuff in the contrib library. I noticed that when I ran main.clj it would run not only the tests in clj-record, but all of the tests in the clojure.contrib as well. I was curious so I attempted to figure out what was going on and what to do to only run the tests in clj-record.test.*. I changed the end of the clj-record/test/main.clj script to this: main.clj (def files [core-test validation-test associations-test]) (doseq [file files] (load file)) (def base-ns (re-find #^\w*.*\. (str *ns*))) (apply test-is/run-tests (map #(symbol (str base-ns %)) files)) main.clj I also had to change the ns function in the associations-test.clj file to match the name of the file. The word 'associations' in the namespace was just misspelled. On Wed, Dec 31, 2008 at 9:39 AM, John D. Hume duelin.mark...@gmail.comwrote: Hi Brian, On Tue, Dec 30, 2008 at 11:41 AM, Brian Doyle brianpdo...@gmail.com wrote: (ns com.example.user) (clj-record.core/init-model) but when I do that I get the error: java.lang.ClassNotFoundException: clj-record.core ... (first (reverse (re-split #\. (name (ns-name *ns*) and could be changed to: (last (re-split #\. (name (ns-name *ns* Those changes have been incorporated, along with stuff in the README about validation. I'm confused as to how I ended up with (first (reverse ...)) since I remember looking at the doc for (last seq), but anyway, it's there now. -hume. -- http://elhumidor.blogspot.com/ --~--~-~--~~~---~--~~ 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 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 code review for clj-record?
I see what you are doing with the validations and defining them in the
init-modelcall.
I think that's a good idea actually and like it better than my solution to
putting the
callbacks in the model namespace.
A couple of small things that I noticed when starting to play around with
clj-record. In your
example you have:
(ns com.example.user)
(clj-record.core/init-model)
but when I do that I get the error:
java.lang.ClassNotFoundException: clj-record.core
When I add a require it clears it up like:
(ns com.example.user
(:require [clj-record.core :as cr.core]))
(cr.core/init-model)
I know this is picky, but in your clj-record.core/init-model function you
have:
(first (reverse (re-split #\. (name (ns-name *ns*)
and could be changed to:
(last (re-split #\. (name (ns-name *ns*
I look forward to seeing clj-record progress. Thanks John.
On Mon, Dec 29, 2008 at 10:20 PM, John D. Hume duelin.mark...@gmail.comwrote:
On Mon, Dec 29, 2008 at 7:15 PM, Brian Doyle brianpdo...@gmail.com
wrote:
I noticed that in the init-model macro you are creating a 'defn table []
...' function in the
model namespace and was wondering why you didn't just make it a def
instead,
since
it doesn't take any args?
That didn't occur to me. I do like the idea of all the functionality
being available directly on clj-record.core with model name as a first
argument in addition to being defined in the model namespace, so I
guess that's one reason. But the inference of table name from model
name should only be the default, so maybe it would be better to just
def it there and let clj-record.core look it up there if needed,
somewhat as you recommended doing for callbacks...
I have an idea for you with the callbacks like, before-create,
after-create,
etc. In the
all-models-metadata in the core.clj you could store the namespace in the
hash
associated with the model-name on setup. Then in the create function
defined in
the core.clj you could call the before-create function defined in the
model
something
like:
(let-if [bc ('before-create (ns-publics model-namespace)] (bc
attributes#))
That's interesting. It's basically the opposite of the way I did the
validation stuff, where you pass in validation functions and those get
stored away in metadata and aren't directly accessible. (Here
metadata is not used in the clojure.org/metadata sense of the word.
I've thought about using clojure metadata to store model info, but I
don't know what symbol or collection I'd attach it to.) I think I
prefer the validation approach, because those functions have a certain
job to do and shouldn't be sitting there cluttering the model
namespace. (On the other hand, it is awfully convenient to be able to
test those functions directly.)
Thanks again for looking. If you or anyone else has further comments,
I'd like to hear them.
git clone git://github.com/duelinmarkers/clj-record.git
-hume.
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Re: Understanding how to use namespaces
On Tue, Dec 30, 2008 at 11:25 PM, Mark Engelberg mark.engelb...@gmail.comwrote: Thanks, that helps dramatically. It took me a while to figure out how to edit the SLIME startup to include my clojure files directory in the classpath, but I got it working. So it seems like you have to make sure the namespace always matches the file. That means if you change the name of the file, you've got to remember to change the namespace declaration as well, right? Is there any way to require/use a file that has no namespace specified at the top? In Clojure Box, is there any way to make the REPL automatically use whatever namespaces are in the files you are actively working on? I don't know anything about SLIME or Clojure Box, but I wrote a little Clojure script that is called when I start the REPL that calls 'use' on most of the namespaces in the Clojure contrib jar. You can see the code here: http://github.com/heyZeus/clojure-stuff/tree/master/repl-init.clj --~--~-~--~~~---~--~~ 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 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: making code readable
Looking at this code the uppercase variables stands out. This isn't idiomatic is it? (def GRID_SIZE 10) (def HEIGHT 600) (def MARGIN 50) On Mon, Dec 29, 2008 at 12:19 PM, Mark Volkmann r.mark.volkm...@gmail.comwrote: On Mon, Dec 29, 2008 at 11:11 AM, lpetit laurent.pe...@gmail.com wrote: You should consider using docstrings for documenting functions Good suggestion. I've changed my code to do that. I also noticed that I had forgotten to replace special characters with built-in entities in my HTML, so that is fixed now. The new version is at http://www.ociweb.com/mark/programming/ClojureSnake.html. What else would you do different in this code? Do you think it still contains too many comments? On 29 déc, 16:45, Mark Volkmann r.mark.volkm...@gmail.com wrote: On Mon, Dec 29, 2008 at 5:44 AM, Mark Volkmann r.mark.volkm...@gmail.com wrote: I would like to produce a version of the snake code that could serve as an example of the kind of code that the Clojure community thinks is good. Unless it's part of an exercise to produce the shortest code possible, I think we should always write Clojure code with a goal of making it as easy as possible for others to read, while not attempting to serve as a Clojure tutorial. Again, my goal here is to get more developers to give Clojure a shot. My challenge to everyone on the list is to start with any version of the snake code you've seen and make it as readable as *you* think it should be by doing things like renaming variables and functions, adding comments and changing indentation. I'd really like to see what *you* think is the best way to write this code. The lessons learned from this exercise could then be applied to other code we write in the future. Okay, I took the challenge and produced a modified version of my earlier code where I removed what I considered to be redundant comments and did a little more renaming. You can see it athttp:// www.ociweb.com/mark/programming/ClojureSnake.html. Feedback is welcomed! I also started documenting some Clojure coding guidelines aimed at making code more readable athttp:// www.ociweb.com/mark/programming/ClojureCodingGuidelines.html and would appreciate feedback on these. I expect there will be cases where not following these is justified, which is why I refer to them as guidelines instead of rules. -- R. Mark Volkmann Object Computing, Inc. -- R. Mark Volkmann Object Computing, Inc. --~--~-~--~~~---~--~~ 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 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 code review for clj-record?
That seems to be working better now John. I looked over most of the code
and it seems
like a good start. I'm no expert when it comes to functional programming or
Clojure,
so I'm not sure how to critic the code exactly. If I was doing the porting
I would prolly
do it in very OO way, since that's what I'm used to, and that would not be
correct.
I noticed that in the init-model macro you are creating a 'defn table []
...' function in the
model namespace and was wondering why you didn't just make it a def instead,
since
it doesn't take any args?
I have an idea for you with the callbacks like, before-create, after-create,
etc. In the
all-models-metadata in the core.clj you could store the namespace in the
hash
associated with the model-name on setup. Then in the create function
defined in
the core.clj you could call the before-create function defined in the model
something
like:
(let-if [bc ('before-create (ns-publics model-namespace)] (bc
attributes#))
That was just an idea I had, but there could be a better way to do it that's
for sure!
Of course it's prolly a bit more complex than that since you the
before-create function
could alter the attributes#, but you get the idea of discovering and calling
the
appropriate callback function in the model namespace.
On Sun, Dec 28, 2008 at 9:49 PM, John D. Hume duelin.mark...@gmail.comwrote:
Ok, please pull the latest and try again.
git clone git://github.com/duelinmarkers/clj-record.git
The problem was due to something I've seen a couple other messages
about: When running a file as a script, it starts out in the
clojure.core namespace. I was doing (def db {...}) before any (ns ...)
so the db var lived in clojure.core, which made it conveniently (but
sloppily) visible everywhere. Loading from the REPL, however, it was
landing in the user namespace. I've now put it in a config namespace
and required config from the two places that need it.
Thanks for looking.
-hume.
On Sun, Dec 28, 2008 at 11:27 PM, John D. Hume duelin.mark...@gmail.com
wrote:
The db configuration isn't reasonable at the moment. You can run
clj_record/test/main.clj as a script but not load it from the REPL.
Let me see if I can get it to work both ways and push an update.
On Sun, Dec 28, 2008 at 6:28 PM, Brian Doyle brianpdo...@gmail.com
wrote:
Having used Rails myself I wanted to check this out and play with it.
I'm
having some
trouble just loading the clj_record/core.clj file though:
1:1 user= (load-file clj_record/core.clj)
java.lang.Exception: Unable to resolve symbol: db in this context
(core.clj:19)
I'm sure it's something I'm doing wrong but I do have derby.jar on my
classpath. Thanks.
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Re: Some code review for clj-record?
Having used Rails myself I wanted to check this out and play with it. I'm having some trouble just loading the clj_record/core.clj file though: 1:1 user= (load-file clj_record/core.clj) java.lang.Exception: Unable to resolve symbol: db in this context (core.clj:19) I'm sure it's something I'm doing wrong but I do have derby.jar on my classpath. Thanks. On Sat, Dec 27, 2008 at 1:48 PM, John D. Hume duelin.mark...@gmail.comwrote: Hi all, As a learning exercise, I've started working on a sort of clojure clone of ActiveRecord (from Rails). You can see it here: http://github.com/duelinmarkers/clj-record/tree/master The model used in the tests is defined in files here: http://github.com/duelinmarkers/clj-record/tree/master/clj_record/test/model And the tests most worth reading are: http://github.com/duelinmarkers/clj-record/tree/master/clj_record/test/core-test.clj http://github.com/duelinmarkers/clj-record/tree/master/clj_record/test/associations-test.clj I'd be interested in any feedback about issues you see, idioms I could be using that I'm not, suggestions on testing approach, or other comments or questions. One style question I'm particularly interested in is what people think the model setup should look like. Currently I've got it implemented to allow a minimum of punctuation: (cljrec/init-model (has-many products)) But is it bad form to use the fact that macros don't evaluate arguments to allow all those naked symbols? For consistency with ns it seems it would be preferable to make has-many a keyword: (cljrec/init-model (:has-many products)) (There actually is a has-many method that gets invoked by init-model, but that's an implementation detail.) My gut says the least confusing approach for a user would be this. (cljrec/init-model (:has-many :products)) ... but something seems weird to me about both :has-many and :products being keywords, where :has-many is a magic keyword and :products is a name being introduced. (Note it doesn't define a var called 'products but does create 'find-products and 'destroy-products functions.) Note that I'm using clojure.contrib.sql and not worrying about the constantly opening and closing connections. Obviously I'd need some way of wrapping a single db transaction around a bunch of expressions to make this a generally useful library. But that's not the point right now. Thanks. -hume. -- http://elhumidor.blogspot.com/ --~--~-~--~~~---~--~~ 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 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: Exercise: how to print multiplication table?
2008/12/22 J. McConnell jdo...@gmail.com On Mon, Dec 22, 2008 at 10:23 AM, Piotr 'Qertoip' Włodarek qert...@gmail.com wrote: Being new to Clojure, to Lisp and to functional programming in general, I have some trouble wraping my head around it. As the first exercice, I would like to print multiplication table of specified order, like: (print-multiplication-table 3) 1 2 3 2 4 6 3 6 9 I came that far: (defn multiplication-row [n k] (map (partial * k) (range 1 (inc n (defn multiplication-table [n] (map (partial multiplication-row n) (range 1 (inc n (println (multiplication-table 3)); = ((1 2 3) (2 4 6) (3 6 9)) Now, how to pretty print this? This does not work - prints nothing - why?: (defn pretty-print-row [row] (map print row)) The problem is that you are using map in two different ways here. In the multiplication-row and multiplication-table functions you are using it correctly as a function that applies a given function to all of the values in a collection, returning the results in a new collection. In the pretty-printing function you do not care about the results like you did in the above two functions, you care about the side-effects. For this, you can use doseq: 1:1 user= (defn multiplication-row [n k] (map (partial * k) (range 1 (inc n #'user/multiplication-row 1:3 user= (defn multiplication-table [n] (map (partial multiplication-row n) (range 1 (inc n #'user/multiplication-table 1:5 user= (defn pretty-print-row [row] (doseq [v row] (print v \space)) (print \newline)) #'user/pretty-print-row 1:7 user= (defn print-multiplication-table [n] (doseq [row (multiplication-table n)] (pretty-print-row row))) #'user/print-multiplication-table 1:9 user= (print-multiplication-table 3) 1 2 3 2 4 6 3 6 9 nil 1:10 user= (print-multiplication-table 5) 1 2 3 4 5 2 4 6 8 10 3 6 9 12 15 4 8 12 16 20 5 10 15 20 25 nil HTH, - J. This is off topic from the original questions, but are the 1:#'s in your REPL line numbers? If so, what did you do to get those? Also if those are line numbers how come only odd numbers are printed? What does the '1:' stand for? 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 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: How to encapsulate local state in closures
I haven't been following the new atom stuff, so I was wondering why atom would be best in this situation, vs a ref? Thanks. On Sun, Dec 21, 2008 at 1:03 PM, Parth Malwankar parth.malwan...@gmail.comwrote: On Dec 21, 11:47 pm, chris cnuern...@gmail.com wrote: I would like to be able to encapsulate local state in a closure. Specifically, I would like a function that returns an incrementing integer, thus: (test_func) 1 (test_func) 2 What is the best way to go about this? With local bindings is failing and I can't figure just why... One way to do this would be to use atom. (defn mk-counter [start] (let [n (atom start)] (fn [] (swap! n inc (def counter (mk-counter 0)) user= (counter) 1 user= (counter) 2 user= (counter) 3 Parth (def test_closure (with-local-vars [one 1] (fn [] (var-get one #'user/test_closure user (test_closure) ; Evaluation aborted. The var is null when I call the closure. Thanks, Chris --~--~-~--~~~---~--~~ 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 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: for FAQ: what are use/require/import/refer?
This would make an excellent FAQ question and answer! On Sat, Dec 20, 2008 at 9:53 AM, Stuart Sierra the.stuart.sie...@gmail.comwrote: This might make a good FAQ question: On Dec 20, 11:25 am, chris cnuern...@gmail.com wrote: I am unclear as to the difference between refer, import use, and require. Hi Chris, require: Load a Clojure library from a file on classpath. Use this when you want to load a library, but leave it in its own namespace. refer: Bring public symbols from one namespace into the current namespace. Use this when a library has already been loaded (example: clojure.set) but you want to use its public symbols without a namespace qualifier. import: Copy Java class names into current namespace. Use this when you want to use a Java class without typing the full package name. use: Combination of require and refer. Use this when you want to load a library AND use its symbols without a namespace qualifier. All four are available as keyword arguments to ns, which is the preferred way to use them: (ns foo.bar (:use my.little.lib) (:require clojure.contrib.duck-streams) (:import (java.io File InputStream)) (:refer clojure.set)) :require also allows aliasing, like this: (ns foo.bar (:require [clojure.set :as set])) Now you can write the symbol clojure.set/union as set/union. -Stuart Sierra --~--~-~--~~~---~--~~ 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 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: multiple sets on one item - is this a good idea?
Instead of require call use and should get you what you want. On Dec 20, 2008 9:15 AM, chris cnuern...@gmail.com wrote: That helped, thanks Christophe. I have one more problem: I put it in a util file, under a util namespace: (ns lambinator.util) (defmacro sets! [vars rest] `(do ~@(map (fn [flds] `(set! (. ~vars ~(first flds)) ~(second flds... Now I want to use it outside that namespace. It seems that I have to do two things when I load from a jar... (require 'lambinator.util) (lambinator.util/sets! c fill GridBagConstraints/VERTICAL weightx 1.5) How do I use the function/macro outside the namespace it was created in without prefixing it with lambinator.util? Import, require don't seem to do what I want... Chris On Dec 20, 12:28 am, Christophe Grand christo...@cgrand.net wrote: chris a écrit :Hello,... --~--~-~--~~~---~--~~ 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 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 -~--~~~~--~~--~--~---
calling use with a seq of strings
I have a seq of strings that are namespaces like, (clojure.contrib.str-utils, clojure.contrib.duck-streams). I wanted to call the use function on this seq. I can't seem to do that though. Any way I can do this or is this just a bad idea? 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 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: calling use with a seq of strings
I didn't know about the symbol function. Thanks! I just want to call use on all of the namespaces in the clojure.contrib jar when starting the repl and this will work nicely! On Mon, Dec 15, 2008 at 1:59 PM, Stuart Sierra the.stuart.sie...@gmail.comwrote: You can do this: (apply use (map symbol (list clojure.contrib.str-utils clojure.contrib.duck-streams))) -Stuart Sierra On Dec 15, 3:51 pm, Brian Doyle brianpdo...@gmail.com wrote: I have a seq of strings that are namespaces like, (clojure.contrib.str-utils, clojure.contrib.duck-streams). I wanted to call the use function on this seq. I can't seem to do that though. Any way I can do this or is this just a bad idea? 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 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 -~--~~~~--~~--~--~---
possible bug with seq and Enumeration?
According to the docs the seq function should be able to take an enumeration, but here is what I see: user= (seq (.elements (doto (java.util.Vector.) (.add hello) (.add world java.lang.IllegalArgumentException: Don't know how to create ISeq from: (NO_SOURCE_FILE:0) SVN 1160, 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 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: possible bug with seq and Enumeration?
Using enumeration-seq does the trick! Thanks. user= (enumeration-seq (.entries (java.util.zip.ZipFile. path to some jar))) On Mon, Dec 15, 2008 at 5:14 PM, Rich Hickey richhic...@gmail.com wrote: On Dec 15, 6:01 pm, Brian Doyle brianpdo...@gmail.com wrote: According to the docs the seq function should be able to take an enumeration, but here is what I see: user= (seq (.elements (doto (java.util.Vector.) (.add hello) (.add world java.lang.IllegalArgumentException: Don't know how to create ISeq from: (NO_SOURCE_FILE:0) If you really want to create a seq on an Enumeration you have to use enumeration-seq. But there is no need to explicitly obtain enumerations/iterators for Collections (and Vector implements Collection): (seq (doto (java.util.Vector.) (.add hello) (.add world))) - (hello world) Note also that Collections have constructors from Collections, and Clojure vectors are Collections: (seq (java.util.Vector. [hello world])) - (hello world) Rich --~--~-~--~~~---~--~~ 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 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: understanding quoting
On Mon, Dec 15, 2008 at 9:43 PM, Daniel Eklund doekl...@gmail.com wrote:
Looks like an if then else version of the map lookup??
ie: (if (%1 %2) (%1 %2) %3)
Is this a special feature of maps in general, such that you can look
up a key but return something else if it doesn't exist?
I hadn't come across it yet, but it sounds useful :)
This is exactly right (I just confirmed it for myself). I looked up
the java code for Keyword.java and Symbol.java both of which implement
IFn (those things that can be put in the function position). The
single and double arity invoke() merely delegate to 'get'. And voila:
How did you know that it delegates to 'get'?
user (doc get)
-
clojure.core/get
([map key] [map key not-found])
Returns the value mapped to key, not-found or nil if key not
present.
The last parameter is definitely for those situations where 'if not
found, use this'
I think I _finally_ understand the statement, keywords and symbols
are functions of maps.
So, the original poster's observation about ('+ '1 '2) returning '2
makes more sense when you consider that it turns into this:
(get '1 '+ '2)
or get from the hashmap ( '1 ) the value stored at key ( '+ ) and if
nil is returned, return ( '2 ) instead
(get '1 '+) returns nil as '1 is not even a map.
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Re: doall and dorun
I'll take a crack at this. It may appear that the doall and dorun return something different with subsequent calls but they don't actually. The doall always returns the sequence (1 2) and dorun always returns nil. The first time (doall x) is called the for loop executes and prints 1 2 (a side effect and is not returned from the for loop) and then returns the seq. The second time it's called x is already assigned the seq and just returns it. It does not execute the for loop again. The dorun call is similar, but instead of returning the seq of the for loop, it always returns nil. According to the api docs, dorun is used to force side effects. On Mon, Dec 15, 2008 at 9:19 PM, wubbie sunj...@gmail.com wrote: Hello, doall and dorun returns different results from seond run on... e.g. user= (def x (for [i (range 1 3)] (do (println i) i))) #'user/x user= (doall x) 1 2 (1 2) user= (doall x) (1 2) user= (doall x) (1 2) user= user= (def x (for [i (range 1 3)] (do (println i) i))) #'user/x user= (dorun x) 1 2 nil user= (dorun x) nil user= (dorun x) nil user= What's the explanation for that? thanks sun --~--~-~--~~~---~--~~ 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 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: Gorilla: Release of Version 1.1.0
I'm sure I'm doing something stupid but I can't start up gorilla. Exception in thread main java.lang.NoClassDefFoundError: de/kotka/gorilla Caused by: java.lang.ClassNotFoundException: de.kotka.gorilla at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) Here is my script: java -cp ~/share/clojure.jar:~/share/clojure-contrib.jar:~/share/gorilla.jar de.kotka.gorilla Gorilla is in my path: $ ls ~/share/gorilla.jar /home/bdoyle/share/gorilla.jar No clue what is going on. On Sat, Dec 13, 2008 at 8:10 AM, Meikel Brandmeyer m...@kotka.de wrote: Hi, Am 13.12.2008 um 15:07 schrieb Randall R Schulz: I installed a couple of new packages on my 10.3 box and now vim --version reports +ruby, so I guess I can at least give it a try there (that's not my primary box, though it is the faster one). Unfortunately, vim by itself cannot do, what I need. There emacs is really better with its elisp. The Ruby interface is - well - also not very satisfactory, but it gets the job done. But one has to pass everything around as strings *ugh*, since the is no basic glue between Vim and the Ruby side. So it's currently a total mess. I'll try to clean that up for the next release 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 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: Gorilla: Release of Version 1.1.0
Thanks Meikel, removing the ~'s worked. Oh and thanks for vimclojure and gorilla! On Sat, Dec 13, 2008 at 9:28 AM, Meikel Brandmeyer m...@kotka.de wrote: Hi, Am 13.12.2008 um 17:17 schrieb Brian Doyle: Here is my script: java -cp ~/share/clojure.jar:~/share/clojure-contrib.jar:~/share/gorilla.jar de.kotka.gorilla I can reproduce the issue. The ~ is a shellish feature from Unix. It is only expanded at the start of a word. So the first ~ in your -cp argument is probably expanded while the others are not. Hence it doesn't find the gorilla.jar, since the JVM sees ~/share/gorilla.jar. When opening this file, the system says: Dunno. Never heard that name. So the class is not found. Convert all ~ in your classpath to absolute (or relative) paths and it works. 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 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: Java interop question
This article has a good example using the proxy function. http://gnuvince.wordpress.com/2008/11/18/fetching-web-comics-with-clojure-part-2/ On Thu, Dec 11, 2008 at 1:22 PM, Randall R Schulz rsch...@sonic.net wrote: On Thursday 11 December 2008 11:31, Mark Engelberg wrote: I understand how Clojure lets you consume Java objects, and pass Clojure objects to Java programs. However, it is not uncommon for Java libraries to be designed in such a way that you need to create a subclass of something in the library in order to make use of the library. I don't understand whether this is possible in Clojure. It's not only possible, but quite straightforward. The basic thing you're looking for is (proxy ...). In some cases, you may need (gen-class). Check them out. They'll get you everything you need for working with white-box frameworks. (I'll check out Geocode/J as soon as I get Firefox back up. It just crashed and I keep 9 windows and over 80 tabs open, so starting it up is pretty slow...) ... Thanks, Mark Randall Schulz --~--~-~--~~~---~--~~ 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 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: why can't I set! stuff in user.clj?
Stuart, I have a ~/.cljrc file that has this stuff in there and in my bash (clj) script to start clojure I do: $JAVA -cp $CLOJURE_JARS clojure.lang.Repl ~/.cljrc On Tue, Dec 9, 2008 at 1:12 PM, Stuart Halloway [EMAIL PROTECTED]wrote: Why can't I call set! in user.clj? (And what is the idiomatic way to do what I want here?) (set! *print-length* 103) - Exception in thread main java.lang.ExceptionInInitializerError at clojure.lang.Repl.clinit(Repl.java:23) Caused by: java.lang.RuntimeException: java.lang.IllegalStateException: Can't change/establish root binding of: *print-length* with set Thanks, Stuart --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: why can't I set! stuff in user.clj?
Steve, Could you post your bash shell script that starts Clojure? I would like to see what you have concerning the new options that can be passed to the updated clojure.jar. Thanks. On Tue, Dec 9, 2008 at 1:59 PM, Stephen C. Gilardi [EMAIL PROTECTED] wrote: user.clj is loaded before thread-local bindings are established. I see you're using Repl.java. You can see the call to pushThreadBindings there to see how it works. user.clj allows you to set up the user namespace, but not set! most vars. With the repl in clojure.main, you can include an init file on your java... command line using the -i option. It will be loaded after those bindings have been established. We do not have anything like a repl-init.clj file that's auto-loaded if it exists to accomplish these kinds of settings. It might be a good idea to have one, loaded from classpath, with a suitable name. More complete solutions to this initialization task (.e.g., for the bash shell) look in a few places for init files. That's something to consider as well. --Steve On Dec 9, 2008, at 3:12 PM, Stuart Halloway wrote: Why can't I call set! in user.clj? (And what is the idiomatic way to do what I want here?) (set! *print-length* 103) - Exception in thread main java.lang.ExceptionInInitializerError at clojure.lang.Repl.clinit(Repl.java:23) Caused by: java.lang.RuntimeException: java.lang.IllegalStateException: Can't change/establish root binding of: *print-length* with set Thanks, Stuart --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
unsupported binding form for cond-let
I started to play with cond-let in the contrib.cond package and got an unexpected error: user= (cond-let [x (zero? 0)] (println hello world)) java.lang.Exception: Unsupported binding form: (zero? 0) (NO_SOURCE_FILE:11) user= (cond-let x (zero? 0) (println hello world)) hello world Maybe it was overlooked when making the binding forms more consistent? Like: user= (when-let [x (zero? 0)] (println hello world)) hello world user= (if-let [x true] (println hello world)) hello world --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: A try on condp (was: Re: proposal: match multimethod)
Can you include an example usage of this function? Thanks. On Wed, Dec 3, 2008 at 12:51 PM, Meikel Brandmeyer [EMAIL PROTECTED] wrote: Hi Stuart and Rich, Am 03.12.2008 um 19:00 schrieb Stuart Sierra: I'm pretty sure I don't like the sound of that at all. We had a nice discussion about fcase/condf, which I'd like to get in, here: http://groups.google.com/group/clojure/browse_frm/thread/dee910bef629... And I haven't forgotten about that, just haven't had time to work on it. Anyone else who wants to tackle it is welcome. How about the following: (defmacro condp condp compares the given needle with the first clause using the given predicate. In case the predicate returns true the second clause is returned. Otherwise condp goes on with the rest of the clauses. In case there is an odd number of clauses the last one will be returned if no preceding clause matched. If no default clause is given an exception is thrown. The predicate is called with needle as first argument and the first clause as second argument. [pred needle clauses] (let [c(count clauses) par (rem c 2) cls (take (if (zero? par) c (dec c)) clauses) cls (mapcat (fn [[x c]] `[(~xprd ~xndl ~x) ~c]) (partition 2 cls)) xndl (gensym condp_needle__) xprd (gensym condp_predicate__) lst (if (zero? par) `(throw (Exception. (str No condp clause matched for: (prn-str ~xndl (last clauses))] `(let [~xprd ~pred ~xndl ~needle] (cond [EMAIL PROTECTED] :else ~lst I mulled about the (x _) syntax, but to be honest: I think #() is perfectly sufficient. We would need to quote all the contents to prevent multiple evaluation, but then we have to recurse and check for _ vs. non-_... I expect the predicate to be a function of two arguments with the first being the needle and the second being the clause, we compare to. Predicates where order doesn't matter or the order agrees may be simply used. Others or more complicated expressions can be wrapped in a #(). Here we still have a problem for #(pred (complicated-computation) %2 %1) In case the number of clauses is even, and no clause matched the predicate, we throw an exception. In case the number of clauses is odd, we return the last one as default. I think adding a simple nil is tolerable, making the I ignore a failed run explicit. What do you think? 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Bug: recur won't work in tail position within cond
This seems to work for me: (defn sub-til-0 [n] (cond (zero? n) 0 :else (recur (dec 1 I'm not sure what those extra ['s are for in your example. On Wed, Dec 3, 2008 at 9:39 PM, puzzler [EMAIL PROTECTED] wrote: (defn sub-til-0 [n] (if (zero? n) 0 (recur (dec 1 works but the equivalent (defn sub-til-0 [n] (cond [(zero? n) 0] [:else (recur (dec 1))])) does not. Recursion is already limited enough in Clojure... give us recur in tail position within cond! :) Thanks, Mark --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: randomize a collection?
Seems like shuffle should be part of the core or in the contrib. Is there a reason why it's not? On Mon, Dec 1, 2008 at 9:55 PM, Timothy Pratley [EMAIL PROTECTED]wrote: http://groups.google.com/group/clojure/browse_thread/thread/180842eb58c58370/0e19ab338452c64f?lnk=gstq=shuffle#0e19ab338452c64f The recommendation was to use java.util.Collections/shuffle and an example was given: (defn shuffle [coll] (let [l (java.util.ArrayList. coll)] (java.util.Collections/shuffle l) (seq l))) user= (shuffle [1 2 3 4 5]) (4 2 1 5 3) On Dec 2, 3:28 pm, Brian Doyle [EMAIL PROTECTED] wrote: Is there a function that takes a collection and randomizes, or shuffles, the items? --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
randomize a collection?
Is there a function that takes a collection and randomizes, or shuffles, the items? --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Newbie: Flattening any collection
As long as you have the clojure.contrib jar in your path you can do: (use 'clojure.contrib.seq-utils) (flatten [1 2 3 '(4 5 6)]) = (1 2 3 4 5 6) On Sun, Nov 30, 2008 at 9:36 PM, samppi [EMAIL PROTECTED] wrote: For any given collection [3 2 [3 5 1] 1 [3 4 1] 0], how may I get [3 2 3 5 1 1 3 4 1 0]? Thanks in advance! --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
update a ref struct
I am parsing a file and to compare the current line with the previous line of the file. I am using line-seq to go thru the file and I thought I would create a ref to store the previous line. When I want to update the previous line value I can't seem to do it. I've never used refs before so I'm sure I'm doing something very stupid. (defstruct line :lat :lon :name) (defn convert [file] (let [prev-line (ref (struct line))] (with-open [r (reader file)] (doseq [l (line-seq r)] (let [ps (split #, l) c-line (struct line (ps 0) (ps 1) (ps 2))] (if (not= c-line @pre-line) (do ; do stuff here then update pre-line (dosync ref-set pre-line (apply struct line (vals c-line))) (println @pre-line ; this prints out all nils doesn't seem to work Sorry if this email is not formatted correctly. Something is wrong with my browser currently typing in a textarea. 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: update a ref struct
Thanks Kevin, I will try using reduce instead. I would like to know what I'm doing wrong with updating the ref for future reference. Thanks. On Mon, Nov 24, 2008 at 3:23 PM, Kevin Downey [EMAIL PROTECTED] wrote: I know you are asking about refs, but you might want to think about using reduce to walk the line-seq. the nature of reduce lets you have access to the line-seq, two lines at a time no need for a ref. On Mon, Nov 24, 2008 at 2:17 PM, Brian Doyle [EMAIL PROTECTED] wrote: I am parsing a file and to compare the current line with the previous line of the file. I am using line-seq to go thru the file and I thought I would create a ref to store the previous line. When I want to update the previous line value I can't seem to do it. I've never used refs before so I'm sure I'm doing something very stupid. (defstruct line :lat :lon :name) (defn convert [file] (let [prev-line (ref (struct line))] (with-open [r (reader file)] (doseq [l (line-seq r)] (let [ps (split #, l) c-line (struct line (ps 0) (ps 1) (ps 2))] (if (not= c-line @pre-line) (do ; do stuff here then update pre-line (dosync ref-set pre-line (apply struct line (vals c-line))) (println @pre-line ; this prints out all nils doesn't seem to work Sorry if this email is not formatted correctly. Something is wrong with my browser currently typing in a textarea. Thanks. -- The Mafia way is that we pursue larger goals under the guise of personal relationships. Fisheye --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: update a ref struct
Yep, that's just a typo in the email. Something was wrong with my browser and I couldn't just paste the code in :( On Mon, Nov 24, 2008 at 3:33 PM, Shawn Hoover [EMAIL PROTECTED]wrote: On Mon, Nov 24, 2008 at 5:17 PM, Brian Doyle [EMAIL PROTECTED]wrote: I am parsing a file and to compare the current line with the previous line of the file. I am using line-seq to go thru the file and I thought I would create a ref to store the previous line. When I want to update the previous line value I can't seem to do it. I've never used refs before so I'm sure I'm doing something very stupid. (defstruct line :lat :lon :name) (defn convert [file] (let [prev-line (ref (struct line))] (with-open [r (reader file)] (doseq [l (line-seq r)] (let [ps (split #, l) c-line (struct line (ps 0) (ps 1) (ps 2))] (if (not= c-line @pre-line) (do ; do stuff here then update pre-line (dosync ref-set pre-line (apply struct line (vals c-line))) (println @pre-line ; this prints out all nils doesn't seem to work Your let binds prev-line, while the code inside uses pre-line. Is that just a typo in your email, or is that the code you're running, too? Shawn --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: offtopic - where are you come from? (poll)
Denver, CO Brian Doyle On Wed, Nov 19, 2008 at 4:09 AM, liu chang [EMAIL PROTECTED] wrote: Singapore +1. On Wed, Nov 19, 2008 at 5:24 PM, walterc [EMAIL PROTECTED] wrote: taipei, taiwan cheers, walter chang --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: multi-method dispatch for structs
I wonder if it would good to have something indicating the struct name put in the metadata when creating a struct? On Fri, Nov 14, 2008 at 1:42 PM, Chouser [EMAIL PROTECTED] wrote: On Fri, Nov 14, 2008 at 2:11 PM, Jeff Rose [EMAIL PROTECTED] wrote: Does my dispatch function have to inspect the passed in values to figure out which type of struct they are, or can I query that somehow? My understanding is that StructMaps are just Maps with an implementation that's optimized to reduce memory usage. The different basis types don't really function as classes of StractMaps or anything. You can still add new keys to StructMaps, for example, just like any other Map. So if you want some kind of 'type' data do dispatch off of, you'll have to attach that yourself, either as another key that all your Maps share or as metadata. --Chouser --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Getting a flat sequence from a map (and vice versa)
Another way to create a map is:
user= (apply hash-map [:a 1 :b 2 :c 3])
{:a 1, :c 3, :b 2}
On Fri, Nov 14, 2008 at 9:42 PM, samppi [EMAIL PROTECTED] wrote:
Excellent! I must remember about the apply function. Thank you very
much.
On Nov 14, 9:35 pm, Kevin Downey [EMAIL PROTECTED] wrote:
On Fri, Nov 14, 2008 at 8:33 PM, Kevin Downey [EMAIL PROTECTED] wrote:
On Fri, Nov 14, 2008 at 8:17 PM, samppi [EMAIL PROTECTED] wrote:
Yeah, I need to be able to do this to easily manage trees of maps. I
meant, how would you idiomatically implement their algorithms?
Fold isn't build into Clojure, but they should still somehow be
possible...right?
On Nov 14, 9:12 pm, Michel Salim [EMAIL PROTECTED] wrote:
On Nov 14, 10:56 pm, samppi [EMAIL PROTECTED] wrote: I'm trying
to figure out how to do this:
(flat-map-seq {:a 3, :b 1, :c 2}) ; returns (:a 3 :b 1 :c 2)
(defn flat-map-seq [m]
(if (empty? m) '()
(let [kv (first m)]
(lazy-cons (kv 0) (lazy-cons (kv 1) (flat-map-seq (rest
m))) ...and vice versa:
(map-from-flat-collection {} [:a 3 :b 1 :c 2]) ; returns {:a 3,
:b
1, :c 2}
(defn map-from-flat-collection [c]
(if (empty? c) {}
(conj (map-from-flat-collection (rrest c)) [(first c) (frest
c)])))
Anyone have any idiomatic ideas?
Well, not sure how idiomatic this is; apart from conj, this is how
you'd do it in Lisp/Scheme. I'd use fold to do the first function if
it's built into Clojure.
Regards,
--
Michel
(apply assoc {} [:a 1 :b 2 :c 3])
- {:c 3, :b 2, :a 1}
--
The Mafia way is that we pursue larger goals under the guise of
personal relationships.
Fisheye
user= (apply concat (seq {:c 3, :b 2, :a 1}))
(:c 3 :b 2 :a 1)
user=
--
The Mafia way is that we pursue larger goals under the guise of
personal relationships.
Fisheye
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Re: (string?) bug
Yep, I'm going that route. Thanks On Tue, Nov 11, 2008 at 2:27 PM, Dave Newton [EMAIL PROTECTED] wrote: --- On Sun, 11/9/08, Brian Doyle wrote: Yes, it is a StringBuilder so technically yes. I guess you since the only thing you ever do with a StringBuilder is produce a string it just seemed like it would be a string. Same goes for StringBuffer. I'd say create your own (stringish? ...) function then--since Clojure is strongly Java-interop returning a T for a non-String would make (string? ...) seem less useful, but that's just my opinion. Dave --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: (string?) bug
Yes, it is a StringBuilder so technically yes. I guess you since the only thing you ever do with a StringBuilder is produce a string it just seemed like it would be a string. Same goes for StringBuffer. On Sat, Nov 8, 2008 at 11:52 PM, Dave [EMAIL PROTECTED] wrote: (Sorry if this is a repeat; hotel networking is sketchy.) On Nov 9, 12:07 am, Brian Doyle [EMAIL PROTECTED] wrote: This seems like a bug returning false for StringBuilder. user= (string? (new java.lang.String hello)) true user= (string? (new java.lang.StringBuilder hello)) false Wouldn't it be a StringBuilder, not a String? user= (. (new java.lang.StringBuilder hello) getClass) #=java.lang.StringBuilder user= (string? (. (new java.lang.StringBuilder hello) toString)) true Dave --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
slurp accepting an encoding parameter
I had a file that was not encoded using the default file encoding so I modified slurp to accept an optional encoding parameter. (defn slurp Reads the file named by f into a string and returns it. Uses the given encoding when opening the file. ([#^String f encoding] (with-open r (if encoding (new java.io.BufferedReader (new java.io.InputStreamReader(new java.io.FileInputStream f), encoding)) (new java.io.BufferedReader (new java.io.FileReader f))) (let [sb (new StringBuilder)] (loop [c (. r (read))] (if (neg? c) (str sb) (do (. sb (append (char c))) (recur (. r (read) Reads the file named by f into a string and returns it. Uses the default encoding when opening the file. ([#^String f] (slurp f 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Clojure Maven integration
Does anyone know of any Clojure maven integration? What I'd like to see is something that will modify Clojure's classpath updated based upon a given pom.xml file. 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: lancet: Clojure controlling Ant
On Thu, Nov 6, 2008 at 11:48 AM, Stuart Halloway
[EMAIL PROTECTED]wrote:
Hi all,
I am playing around with using Clojure to control Ant, something along
the lines of Groovy's Gant. I don't know how far I will take this--
right now it is serving as a code example for the book.
Two questions:
(1) Anybody interested in seeing lancet carried forward into a real
project?
Yes, I hate ant and pretty much anything would be better! I might have
some time to help out with the implementation.
(2) Below is an example of lancet syntax (compare with Clojure's own
build.xml). Any big likes/dislikes?
No complaints from me. I like the syntax.
Cheers,
Stuart
(project {:name clojure :default jar}
(properties :src src
:jsrc (i :src /jvm)
:cljsrc (i :src /clj)
:build classes
:clojure_jar clojure.jar
:bootclj (i :cljsrc /clojure/boot.clj))
(target {:name test}
(echo {:message init target}))
(target {:name compile :depends init
:description Compile Java sources.}
(javac {:srcdir (i :jsrc) :destdir (i :build)
:includejavaruntime yes
:debug true
:target 1.5}))
(target {:name init}
(tstamp)
(mkdir {:dir (i :build)}))
(target {:name clean
:description Remove autogenerated files and directories}
(delete {:dir (i :build)}))
)
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Re: remainder function
The function is 'rem'. user= (rem 5 2) 1 On Wed, Oct 15, 2008 at 3:35 PM, Islon [EMAIL PROTECTED] wrote: Is there a remainder (rest of the division) function in closure? (as java '%' operator). I browse the docs but couldn't find one. --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: equality and struct inheritance
On Tue, Oct 7, 2008 at 2:32 PM, Stuart Halloway [EMAIL PROTECTED]wrote: Hi Brian, (1) What does it mean to be equal on id and not equal on the other fields? If two fields claim the same id but a different name, how would you know which one to keep? I guess it could depend on the situation and you may not care about the other fields at all, only on the id. I'm used to Java/Ruby when you define an equals and hashcode method that determines equality which very well may be a subset of the total attributes on an object. (2) Given some answer to #1, why not store the structs in a map under id? I could, but does this mean that I couldn't store the place objects in a set to dedup the places? It would appear that a struct uses all of the attributes of the map to determine equality. I was hoping I could overwrite equality for a given struct. (3) For the geocoded place struct, I would be tempted to just create a separate defstruct. Nothing in Clojure prevents the two different kinds of structures from being substituted for one another. You could look into make-hierarchy, etc. plus defmulti if you find that you need inheritance-like behavior for method dispatch. Yes, I was just being somewhat lazy with this. If I define 10 attributes for a given struct and wanted to use all of those plus 3 more in a new struct I didn't want to have to write out those original 10 attributes again. Thanks. Stuart I'm attempting to learn Clojure with a long history of OO and have some questions.I've created a defstruct for a place type object like: (defstruct place :id :name :street :city :state :zip) I want to write a function that would take a list of places and remove the duplicates. Duplicates are defined by places having the same :id. I created a 'place' namespace and attempted to create a function called '=' that would only use the :id to compare two places, however, I was not about to create such a function name. Is there a preferred function name for equality in this case? Coming from an OO background and wanting a geocoded-place struc is there a way to inherit from the place struct? Something like take all of the existing keys from the place struct and also add :latitude :longitude? 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
