Too many arguments to if
I get the error Too many arguments to if with this. Do you have any suggestion? (defn make-tree [tree [n1 n2 n3 n4]] (.addItem tree n1) (if (empty? n2) (.setChildrenAllowed tree n1 false) (doto tree (.addItem n2) (.setParent n2 n1) (.expandItemsRecursively n1)) (if (empty? n3) (.setChildrenAllowed tree n2 false) (doto tree (.addItem n3) (.setParent n3 n2) (.expandItemsRecursively n2)) (if (empty? n4) (.setChildrenAllowed tree n3 false) (doto tree (.addItem n4) (.setParent n4 n3) (.expandItemsRecursively n3) (.setChildrenAllowed n4 false) tree) -- 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: Too many arguments to if
Antonio Recio amdx6...@gmail.com writes: Hi Antonio, I get the error Too many arguments to if with this. Do you have any suggestion? `if' expects exacly one test, one then-form, and one else-form. Your first and second `if' contain two forms in else. You have to wrap them in a `do'. --8---cut here---start-8--- (defn make-tree [tree [n1 n2 n3 n4]] (.addItem tree n1) (if (empty? n2) (.setChildrenAllowed tree n1 false) (do (doto tree (.addItem n2) (.setParent n2 n1) (.expandItemsRecursively n1)) (if (empty? n3) (.setChildrenAllowed tree n2 false) (do (doto tree (.addItem n3) (.setParent n3 n2) (.expandItemsRecursively n2)) (if (empty? n4) (.setChildrenAllowed tree n3 false) (do (doto tree (.addItem n4) (.setParent n4 n3) (.expandItemsRecursively n3) (.setChildrenAllowed n4 false) tree --8---cut here---end---8--- Bye, Tassilo -- 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 lazy version of shuffle.
Hello everybody, I think a lazy version of shuffle would be a good addtion to the core. I tried googling for one and found http://ytakenaka.blogspot.com/2011/05/lazy-shuffle-clojure.html which was infact slower than original shuffle and was unable to reproduce the performance claims made there in. In fact the experiment showed that the lazy-shuffle was about 10 times slower (of course depends on the size of the collection to be shuffled).. Can somebody help me ? Thanks, Sunil. -- 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 lazy version of shuffle.
Sunil S Nandihalli sunil.nandiha...@gmail.com writes: Hi Sunil, I think a lazy version of shuffle would be a good addtion to the core. I tried googling for one and found http://ytakenaka.blogspot.com/2011/05/lazy-shuffle-clojure.html which was infact slower than original shuffle and was unable to reproduce the performance claims made there in. I think there is no way to implement a good lazy version of shuffle. Correct shuffling, i.e., the result should be a real pseudo-random permutation of all elements, can only be defined on finite seqs anyway. And there, one has to realize the given seq. In the code you cite, there's (defn lazy-shuffle [lst fetch-len] (let [len (count lst) ^^^ which does exactly that. So here only the cheap creation of the shuffled seq is lazy, but the possibly expensive calculation of the given seq is (and has to be done) directly. Bye, Tassilo -- 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: Build tool for mixed Clojure/Java projects
Ken Wesson kwess...@gmail.com wrote: On Wed, Jul 6, 2011 at 4:30 AM, Michael Wood esiot...@gmail.com wrote: On 6 July 2011 10:14, Ken Wesson kwess...@gmail.com wrote: Sorry, but I think version control and, particularly, dealing with edit collisions is not something you can solve as easily as just slapping a lock onto each file access, or else version control servers could just be FTP servers that locked their shared files during each access. Maybe so, but that is all beside the point. The point was that repository needn't mean networked. Maybe just repository that isn't fragile or outright broken then. ;) In that case, pretty much all unix-based source control systems are fragile or outright broken, as they all have a files on disk mode that doesn't require a server: cvs, svn, git, hg, etc. Even fossil - which uses an ACID SQL database to store things - does this. Perforce is the only exception I can think of. If the CVS clients are the only ones doing the locking, then why not? ARE they the only ones doing the locking OR otherwise accessing the files, though? Once you allow arbitrary commands to access the data on disk, you have problems. How you do file locking doesn't matter. *minimum* it would seem that a real database with ACID and transactions would be needed -- A to avoid race conditions (no advisory locks here!), C to keep the internal state invariants valid, As I mentioned, fossil does this. However, the database is embedded, meaning it uses those advisory locks to deal with inter-process coordination. This is why various people moved away from CVS. To get atomic commits etc. I to be able to deal with edit collisions in a sane manner, and D for the obvious reasons. And a suitable software front-end. And now we're back to having at least one server in the mix, namely the DBMS at the backend. :) The only source control system I know that uses an ACID database doesn't need a back end server. Right, I agree it's best to have a server controlling access to the repository, but that does not mean that the concept of a repository is linked to having a server or a network. No, just the concept of a reliable repository. ;) Only if it's really badly designed. Like early versions of subversion. Of course, they broke even worse if you put them on a server instead of using direct file access. If you don't have a satisfactory answer there, then you probably need a real database. Of course perhaps you are clever and can design your own on-disk data structures that will fail-soft in some manner under such circumstances and convince yourself beyond a reasonable doubt that it'll work, but if not ... CVS is an old version control system that was far better than the other things around at the time it was invented, but most people seem to agree that other, more modern, version control systems are better and/or more reliable. And all the popular ones have clients that can directly access the repository without a server. -- Sent from my Android tablet with K-9 Mail. Please excuse my brevity. -- 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: Native compiler on Clojure
i think he means clojure in clojure Il giorno 11/lug/2011 12.12, Philipp Meier phme...@gmail.com ha scritto: On 11 Jul., 00:26, cran1988 rmanolis1...@hotmail.com wrote: Did anyone started creating native compiler for Clojure language ? Do you mean a compiler which emits native code or do you mean a compiler written in clojure emitting java byte code? -billy. -- 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: Build tool for mixed Clojure/Java projects
On Sun, Jul 10, 2011 at 2:01 AM, mike.w.me...@gmail.com m...@mired.org wrote: [snip most of post whose sole purpose seems to be to gainsay anything I write] The only source control system I know that uses an ACID database doesn't need a back end server. How exactly is this possible? Databases *are* servers. Database and DBMS are used more-or-less synonymously (when database isn't used more broadly than ACID/SQL/etc.) and the S in DBMS stands for server. SQL is to databases/clients as HTTP GET/POST syntax is to web servers/browsers. Etc. -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- 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 lazy version of shuffle.
Sunil S Nandihalli sunil.nandiha...@gmail.com writes: Hi Sunil, yea true, the full sequence has to be realized before it is shuffled .. but however the thing is that I am only interested in the first couple of elements of the shuffled sequence. Well, in that case, you can use the standard shuffle, right? For example, to get a random permutation of the first 10 natural numbers, you can do: (shuffle (take 10 (iterate inc 0))) == [1 6 9 8 4 5 3 7 0 2] However, you cannot get a seq of 10 randomly chosen natural numbers, because that would mean to realize the seq of natural numbers. (take 10 (shuffle (iterate inc 0))) == Runs till hell freezes over But if you specify an upper limit, then it'll work again. (take 10 (shuffle (take 1000 (iterate inc 0 == (748 460 353 349 586 743 994 404 468 306) Of course, that will realize the first 1000 natural numbers, although you only take 10 out of it. Well, in that use-case, you'd probably want to go with rand-int anyway. Bye, Tassilo -- 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: jdbc and postgresql type problem
Silly question, but which version of java.jdbc are you using? Up until
0.0.3 I had no end of troubles with psql because of the batchExecute issue.
Cheers,
Aaron Bedra
--
Clojure/core
http://clojure.com
On 07/11/2011 02:48 AM, Brian Carper wrote:
On Jul 10, 4:52 pm, Wilfredyowilf...@gmail.com wrote:
I'm at a bit of a loss. UPDATE comments SET approved='1' WHERE id =
'1' works fine in psql. approved is a boolean field, so is this an
issue with the SQL library producing incorrect SQL?
I think this is an oddity with the JDBC driver for PostgreSQL. The
driver doesn't seem to like doing automatic typecasting. Try this:
(sql/update-values :comments
[id = cast(? as integer) id]
;; alternatively id = ?::integer
{:approved true})
Or you could (Integer/parseInt id) to do the cast before you pass it
as parameter, though in either case you should validate your id before
casting, if you want to avoid dying on poorly-formed input.
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Clojure Wiki for general public
It seems we don't have a *centralized* wiki not just for the Clojure Core developers, but for everybody in our community. Application developers have to look for *broad* info all over different resources. I have just tried Clojure 1.3 and realized I have to google a lot to find answers. - ClojureDocs.org is for 1.2. clojure.org. - http://dev.clojure.org/display/doc/1.3 seems to be in a transitional state. - Library catalogs are on a few other sites and have no wiki functionality. - Advises on moving away from clojure.contrib are spread in the mail list. - Stackoverflow's clojure tag is of question-answers nature and seems not to attract a lot of us. - GitHub has a lot of libraries but sometimes it's hard to compare them. - A lot of useful blog posts are reachable mainly from Google. May be we need a Clojure Wiki for regular users? Promoted from official resources to be the main attraction point. Do I miss anything? Regards, Sergey. -- 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
How to add jar files to leiningen projects?
Hello, I have some external jar libaries that I need to import in my clojure namespace. As I just started to use leinigen, I don't understand how to add them to my project. Let's say the library resides in c:\temp\jars\mylib.jar How do I add this properly to mein leinigen project? (defproject myproject 1.0.0-SNAPSHOT :description FIXME: write description :dependencies [[org.clojure/clojure 1.2.1] [org.clojure/clojure-contrib 1.2.0] [WHAT TO PUT IN HERE?]]) I assume I have to put that to .m2 repository but how? Thanks. - Finn -- 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: How to add jar files to leiningen projects?
To install the jars to your local maven repository (~/.m2): mvn install:install-file -Dfile=path-to-file -DgroupId=group-id -DartifactId=artifact-id -Dversion=version -Dpackaging=packaging -DgeneratePom=true Where: path-to-file the path to the file to load group-id the group that the file should be registered under artifact-id the artifact name for the file version the version of the file packaging the packaging of the file e.g. jar Then, in your project.clj, specify the groupid/artifact-id and version: (defproject myproject 1.0.0-SNAPSHOT :description FIXME: write description :dependencies [[org.clojure/clojure 1.2.1] [org.clojure/clojure-contrib 1.2.0] *[finbeau/special-jar 1.0.0]*]) ;; or whatever group-id/artifact-id and version you specified above On Mon, Jul 11, 2011 at 11:23 AM, finbeu info_pe...@t-online.de wrote: Hello, I have some external jar libaries that I need to import in my clojure namespace. As I just started to use leinigen, I don't understand how to add them to my project. Let's say the library resides in c:\temp\jars\mylib.jar How do I add this properly to mein leinigen project? (defproject myproject 1.0.0-SNAPSHOT :description FIXME: write description :dependencies [[org.clojure/clojure 1.2.1] [org.clojure/clojure-contrib 1.2.0] [WHAT TO PUT IN HERE?]]) I assume I have to put that to .m2 repository but how? Thanks. - Finn -- 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: Build tool for mixed Clojure/Java projects
On 11 Lug, 13:51, Ken Wesson kwess...@gmail.com wrote: On Sun, Jul 10, 2011 at 2:01 AM, mike.w.me...@gmail.com m...@mired.org wrote: [snip most of post whose sole purpose seems to be to gainsay anything I write] The only source control system I know that uses an ACID database doesn't need a back end server. How exactly is this possible? Databases *are* servers. No, many of them offer access through a server, but the server is usually one component among many other ones. For example, you are not required to start the network listener in order to use Oracle. Not speaking of all the embedded databases such as Neo4j, Derby, etc. Database and DBMS are used more-or-less synonymously (when database isn't used more broadly than ACID/SQL/etc.) and the S in DBMS stands for server. No, it stands for system: http://en.wikipedia.org/wiki/Database_management_system SQL is to databases/clients as HTTP GET/POST syntax is to web servers/browsers. Etc. HTTP is defined in terms of network communication, though you could in principle make process-local HTTP requests. SQL instead doesn't need to know anything at all about networking. To return to the source code repository topic - most if not all source code versioning systems do not need a server in order to host a repository. That is especially true for distributed VCS's such as Mercurial or Git, where there's no distinction between repository and working copy: the project you checked out (or rather cloned) on your local machine is a full-fledged repository just like the one where you cloned it from, and you don't need a server to use it. Moreover, non- distributed VCS's such as CVS and SVN are often based on filesystem access as well, and access through a networked server is provided as a layer on top of it. So, repository does not imply server at all, at least when we're speaking about source code versioning repositories. Alessio -- 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 Wiki for general public
I feel the same, although Wikibooks is kind of what you need: http://en.wikibooks.org/wiki/Clojure_Programming -- 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: How to add jar files to leiningen projects?
I haven't seen that it can (doesn't mean it can't though ;). It would seem to be a natural option for the 'lein install' task, to add a three argument option: [path-to-jar project-name version], where project-name is the same as in the two argument version (group-id/artifact-id). - Mark On Mon, Jul 11, 2011 at 1:00 PM, Vincent vincent@gmail.com wrote: can lein do that ? -- 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: jdbc and postgresql type problem
On Jul 11, 6:41 am, Aaron Bedra aaron.be...@gmail.com wrote: Silly question, but which version of java.jdbc are you using? Up until 0.0.3 I had no end of troubles with psql because of the batchExecute issue. I tested Wilfred's code with 0.0.3-SNAPSHOT. --Brian -- 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 lazy version of shuffle.
If the sequence is already realized, or is cheap, and you want only a very small random subset of it, you can do better than shuffling the whole thing. Fliebel and I played around with several solutions to this, some time ago. I can't find the whole thing, but some interesting examples and benchmarking data are at https://gist.github.com/805747 if you want to try it out. On Jul 11, 3:57 am, Tassilo Horn tass...@member.fsf.org wrote: Sunil S Nandihalli sunil.nandiha...@gmail.com writes: Hi Sunil, I think a lazy version of shuffle would be a good addtion to the core. I tried googling for one and found http://ytakenaka.blogspot.com/2011/05/lazy-shuffle-clojure.htmlwhich was infact slower than original shuffle and was unable to reproduce the performance claims made there in. I think there is no way to implement a good lazy version of shuffle. Correct shuffling, i.e., the result should be a real pseudo-random permutation of all elements, can only be defined on finite seqs anyway. And there, one has to realize the given seq. In the code you cite, there's (defn lazy-shuffle [lst fetch-len] (let [len (count lst) ^^^ which does exactly that. So here only the cheap creation of the shuffled seq is lazy, but the possibly expensive calculation of the given seq is (and has to be done) directly. Bye, Tassilo -- 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: How to add jar files to leiningen projects?
Maven will give you this list of instructions if you just add a dependency to project.clj, and it can't find the required artifact. So write your project.clj as though your external jars were available to maven, and then maven will tell you how to make it available. It's the same as Mark's suggestion, but imo easier to reproduce yourself than saving a bookmark to Mark's answer. On Jul 11, 8:29 am, Mark Rathwell mark.rathw...@gmail.com wrote: To install the jars to your local maven repository (~/.m2): mvn install:install-file -Dfile=path-to-file -DgroupId=group-id -DartifactId=artifact-id -Dversion=version -Dpackaging=packaging -DgeneratePom=true Where: path-to-file the path to the file to load group-id the group that the file should be registered under artifact-id the artifact name for the file version the version of the file packaging the packaging of the file e.g. jar Then, in your project.clj, specify the groupid/artifact-id and version: (defproject myproject 1.0.0-SNAPSHOT :description FIXME: write description :dependencies [[org.clojure/clojure 1.2.1] [org.clojure/clojure-contrib 1.2.0] *[finbeau/special-jar 1.0.0]*]) ;; or whatever group-id/artifact-id and version you specified above On Mon, Jul 11, 2011 at 11:23 AM, finbeu info_pe...@t-online.de wrote: Hello, I have some external jar libaries that I need to import in my clojure namespace. As I just started to use leinigen, I don't understand how to add them to my project. Let's say the library resides in c:\temp\jars\mylib.jar How do I add this properly to mein leinigen project? (defproject myproject 1.0.0-SNAPSHOT :description FIXME: write description :dependencies [[org.clojure/clojure 1.2.1] [org.clojure/clojure-contrib 1.2.0] [WHAT TO PUT IN HERE?]]) I assume I have to put that to .m2 repository but how? Thanks. - Finn -- 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: How to add jar files to leiningen projects?
Mark Rathwell mark.rathw...@gmail.com writes: I haven't seen that it can (doesn't mean it can't though ;). It would seem to be a natural option for the 'lein install' task, to add a three argument option: [path-to-jar project-name version], where project-name is the same as in the two argument version (group-id/artifact-id). I'd be happy to take such a patch, though as Alan has said it's easy enough to get the equivalent mvn invocation from Leiningen itself. -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
Reworking :pre condition to add an error message
Note: This message was originally posted by ' Shantanu' on the *Re: Clojure
for large programs* thread.
I took a look at Shantanu's macros, and I like the concept a lot. But I
would prefer something baked into the :pre condition itself. The reason is
that it just removes a layer of indirection. If you dig into '*
clj/clojure/core.clj*', you can see that the 'fn' macro is using 'assert' to
test these conditions. Assert allows error messages to be applied, ie:
*user = (assert false) *
*user = (assert false fubar) *
However, (defmacro fn ...) assumes that just the boolean condition is being
passed in, A). But I'd like to have the option to pass in a message B).
*A) *
**
*(def fubar *
* (fn []*
*{:pre [ (true? false) ] }*
*(println Hello World)))*
*(fubar)*
*
*
*B) *
*(def thing *
* (fn []*
*{:pre [ [(true? false) A false message] ] }*
*(println Hello World)))*
*(thing)*
I reworked the 'fn' macro, only for the :pre condition, as a demonstration (see
here http://pastebin.com/fETV1ejJ). The calling semantics don't change
that much. Is there any interest in putting this into core? I'd
use Shantanu's workaround otherwise, or in the interim.
Thanks
Tim Washington
twash...@gmail.com
416.843.9060
On Sun, Jul 3, 2011 at 11:42 AM, Shantanu Kumar kumar.shant...@gmail.comwrote:
On Jul 3, 7:39 pm, Timothy Washington twash...@gmail.com wrote:
I'm using pre / post assertions quite a bit in a project I'm building.
And I
too would love to see better or custom error messages for each assertion.
That should be possible with a macro. For example, I use this:
https://bitbucket.org/kumarshantanu/clj-miscutil/src/acfb97c662d9/src/main/clj/org/bituf/clj_miscutil.clj#cl-1009
Maybe you need something like this(?):
(defmacro verify-my-arg
Like assert, except for the following differences:
1. does not check for *assert* flag
2. throws IllegalArgumentException
[err-msg arg]
`(if ~arg true
(throw (IllegalArgumentException. ~err-msg
Then use it thus:
(defn foo [m]
{:pre [(verify-my-arg m must be a map (map? m))]}
(println m))
Regards,
Shantanu
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Re: Reworking :pre condition to add an error message
On 7/11/11 11:40 AM, Timothy Washington wrote:
Note: This message was originally posted by ' Shantanu' on the */Re:
Clojure for large programs/* thread.
I took a look at Shantanu's macros, and I like the concept a lot. But
I would prefer something baked into the :pre condition itself. The
reason is that it just removes a layer of indirection. If you dig into
'*clj/clojure/core.clj*', you can see that the 'fn' macro is using
'assert' to test these conditions. Assert allows error messages to be
applied, ie:
/user = (assert false) /
/user = (assert false fubar) /
However, (defmacro fn ...) assumes that just the boolean condition is
being passed in, A). But I'd like to have the option to pass in a
message B).
/A) /
/(def fubar /
/ (fn []/
/{:pre [ *(true? false)* ] }/
/(println Hello World)))/
/(fubar)/
/
/
/B) /
/(def thing /
/ (fn []/
/{:pre [ *[(true? false) A false message]* ] }/
/(println Hello World)))/
/(thing)/
I reworked the 'fn' macro, only for the :pre condition, as a
demonstration (see here http://pastebin.com/fETV1ejJ). The calling
semantics don't change that much. Is there any interest in putting
this into core? I'd use Shantanu's workaround otherwise, or in the
interim.
Thanks
Tim Washington
twash...@gmail.com mailto:twash...@gmail.com
416.843.9060
I'd like to see something like this added as well since I sometimes
write a comment by conditions to help remind myself of why they are
present. One comment on the patch that is probably obvious, but if we
change the API for :pre we would want to update the :post API as well to
keep them consistent.
-Ben
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Aw: How to add jar files to leiningen projects?
That was fast. Makes sense. Thanks! - Finn -- 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: Reworking :pre condition to add an error message
Yes, the :post is easily done as well. I just wanted to throw up a quick
proof-of-concept.
Tim
On Mon, Jul 11, 2011 at 1:52 PM, Ben Mabey b...@benmabey.com wrote:
**
On 7/11/11 11:40 AM, Timothy Washington wrote:
Note: This message was originally posted by ' Shantanu' on the *Re:
Clojure for large programs* thread.
I took a look at Shantanu's macros, and I like the concept a lot. But I
would prefer something baked into the :pre condition itself. The reason is
that it just removes a layer of indirection. If you dig into '*
clj/clojure/core.clj*', you can see that the 'fn' macro is using 'assert'
to test these conditions. Assert allows error messages to be applied, ie:
*user = (assert false) *
*user = (assert false fubar) *
However, (defmacro fn ...) assumes that just the boolean condition is
being passed in, A). But I'd like to have the option to pass in a message
B).
*A) *
*(def fubar *
* (fn []*
*{:pre [ (true? false) ] }*
*(println Hello World)))*
*(fubar)*
*
*
*B) *
*(def thing *
* (fn []*
*{:pre [ [(true? false) A false message] ] }*
*(println Hello World)))*
*(thing)*
I reworked the 'fn' macro, only for the :pre condition, as a
demonstration (see here http://pastebin.com/fETV1ejJ). The calling
semantics don't change that much. Is there any interest in putting this into
core? I'd use Shantanu's workaround otherwise, or in the interim.
Thanks
Tim Washington
twash...@gmail.com
416.843.9060
I'd like to see something like this added as well since I sometimes write a
comment by conditions to help remind myself of why they are present. One
comment on the patch that is probably obvious, but if we change the API for
:pre we would want to update the :post API as well to keep them consistent.
-Ben
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BDD - Given When Then
Hi, I like to write some integration/acceptance tests in Clojure. At the moment I'm using cuke4duke (cucumber), but I'm not satisfied with it. For my unit tests I'm already using lazytest. In the acceptance tests I like to apply the typical Given When Then template (like cucumber do). So are there any nice alternatives to cucumber/cuke4duke? I know circumspec https://github.com/stuarthalloway/circumspec, but the project makes no progress anymore? What is the relationship between circumspec and lazytest https://github.com/stuartsierra/lazytest? How can acceptance tests be written with lazytest, which follow the Given When Then template (like thishttps://github.com/stuarthalloway/circumspec/blob/master/examples/the-rspec-book/greeter_feature.cljcircumspec example)? Best regards Max -- 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
Aw: Re: How to add jar files to leiningen projects?
Hi Phil, leiningen is really great. I haven't used maven before so I was really scratching my head. Would be great to have an option like this so I don't have to run mvn on the command line. Thanks! - Finn -- 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: Reworking :pre condition to add an error message
If this could integrate with existing efforts put on validation libraries,
plus (optionnally) a way to customize the rendering of pre-condition
errors, this could be great :-)
Maybe just inverting things : if the precondition returns falsy, this could
mean that there is no violated precondition. If the precondition returns
truethy, this could be printed.
2011/7/11 Timothy Washington twash...@gmail.com
Note: This message was originally posted by ' Shantanu' on the *Re:
Clojure for large programs* thread.
I took a look at Shantanu's macros, and I like the concept a lot. But I
would prefer something baked into the :pre condition itself. The reason is
that it just removes a layer of indirection. If you dig into '*
clj/clojure/core.clj*', you can see that the 'fn' macro is using 'assert'
to test these conditions. Assert allows error messages to be applied, ie:
*user = (assert false) *
*user = (assert false fubar) *
However, (defmacro fn ...) assumes that just the boolean condition is being
passed in, A). But I'd like to have the option to pass in a message B).
*A) *
**
*(def fubar *
* (fn []*
*{:pre [ (true? false) ] }*
*(println Hello World)))*
*(fubar)*
*
*
*B) *
*(def thing *
* (fn []*
*{:pre [ [(true? false) A false message] ] }*
*(println Hello World)))*
*(thing)*
I reworked the 'fn' macro, only for the :pre condition, as a demonstration
(see here http://pastebin.com/fETV1ejJ). The calling semantics don't
change that much. Is there any interest in putting this into core? I'd
use Shantanu's workaround otherwise, or in the interim.
Thanks
Tim Washington
twash...@gmail.com
416.843.9060
On Sun, Jul 3, 2011 at 11:42 AM, Shantanu Kumar
kumar.shant...@gmail.comwrote:
On Jul 3, 7:39 pm, Timothy Washington twash...@gmail.com wrote:
I'm using pre / post assertions quite a bit in a project I'm building.
And I
too would love to see better or custom error messages for each
assertion.
That should be possible with a macro. For example, I use this:
https://bitbucket.org/kumarshantanu/clj-miscutil/src/acfb97c662d9/src/main/clj/org/bituf/clj_miscutil.clj#cl-1009
Maybe you need something like this(?):
(defmacro verify-my-arg
Like assert, except for the following differences:
1. does not check for *assert* flag
2. throws IllegalArgumentException
[err-msg arg]
`(if ~arg true
(throw (IllegalArgumentException. ~err-msg
Then use it thus:
(defn foo [m]
{:pre [(verify-my-arg m must be a map (map? m))]}
(println m))
Regards,
Shantanu
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What's your workflow in IntelliJ IDEA
Hi, I'm using Jetbrains IntelliJ IDEA Community Edition with La Clojure and Leiningen Plug In. I think it is really great, but I have the feeling my workflow is not very efficient, it is a mix of invoking command lines (lein new myproject), then switching to IDEA, running lein commands from the plug in, compile, the running scripts from IDEA directly (Menu - and Run), sometime I use lein run -m myproject.core to run it. I looks like that I'm not sure what to actually use. So how do you use IDEA with clojure? I think the way I use it is not very efficient ... - Finn -- 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: Tree vaadin?
Harsha Sanjeewa has translated the vaadin example of the tree in clojure. The source is here https://github.com/hsenid-mobile/clj-vaadin. It is very useful to begin working with clojure and vaadin. This tree example has 2 levels and I would like to have 4 levels. With the following code it shows still the 2 levels, although the levels 3 and 4 are parented. Why is there no level 3 and 4? (defn level1 [tree [n1 n2 n3 n4]] (.addItem tree n1) (if (empty? n2) (.setChildrenAllowed tree n1 false) (do (reduce (fn [tree n2] (doto tree (.addItem n2) (.setParent n2 n1))) tree n2) (.expandItemsRecursively tree n1) (if (empty? n3) (.setChildrenAllowed tree n2 false) (do (reduce (fn [tree n3] (doto tree (.addItem n3) (.setParent n3 n2))) tree n3) (.expandItemsRecursively tree n2) (if (empty? n4) (.setChildrenAllowed tree n3 false) (do (doto tree (.addItem n4) (.setParent n4 n3) (.expandItemsRecursively n3) (.setChildrenAllowed n4 false) ))) tree) -- 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: Build tool for mixed Clojure/Java projects
On Mon, Jul 11, 2011 at 11:29 AM, Alessio Stalla alessiosta...@gmail.com wrote: [snip most of another post whose sole purpose seems to be to gainsay anything I write] Database and DBMS are used more-or-less synonymously (when database isn't used more broadly than ACID/SQL/etc.) and the S in DBMS stands for server. No, it stands for system I've seen it spelled out as database management server innumerable times. SQL is to databases/clients as HTTP GET/POST syntax is to web servers/browsers. Etc. HTTP is defined in terms of network communication, though you could in principle make process-local HTTP requests. SQL instead doesn't need to know anything at all about networking. I didn't say HTTP, I said HTTP GET/POST syntax. That's carried over HTTP the way SQL is carried over a DBMS wire protocol. So, repository does not imply server at all, This is getting silly. Repository is a word that brings immediately to mind typing checkin and checkout commands at a command prompt in order to work on source code that is stored remotely. And remotely implies server. -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- 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 lazy version of shuffle.
On Mon, Jul 11, 2011 at 1:13 PM, Alan Malloy a...@malloys.org wrote: If the sequence is already realized, or is cheap, and you want only a very small random subset of it, you can do better than shuffling the whole thing. Fliebel and I played around with several solutions to this, some time ago. I can't find the whole thing, but some interesting examples and benchmarking data are at https://gist.github.com/805747 if you want to try it out. Also if the sequence is not realized but there's a cheap way to calculate (nth the-hypothetical-sequence n) just knowing n and not previous members, there are ways to lazily generate part of a random permutation: (take k (distinct (f (rand-int limit where n ranges from 0 to limit-1, f changes n to (nth the-hypothetical-sequence n) without realizing (or even creating as a seq object) the-hypothetical-sequence, and k limit is the number of items desired from the head of the shuffled sequence. (take limit (distinct (f (rand-int limit represents a full random permutation whose elements can be taken lazily. The downside is that the (distinct ...) implements a rejection algorithm, so that we get a uniform random element, then a uniform random from what's left, then ... and so a uniformly-chosen random permutation, but at the cost that if you realize most or all of the permutation and not just the first few elements of a big one it will slow down tremendously. For instance if limit is 10,000 and you realize the whole thing it will need 10,000 tries on average before generating the final element. The (distinct ...) also amounts to holding onto the head. So this works well if you want the first few elements of the permutation, f exists, and you don't want to realize all of the-hypothetical-sequence. It works terribly if you want the whole permutation or much of it or f does not exist. There are obvious ways to speed up distinct in this case and make it more compact, though, for the special case of sets of nonnegative integers from a range starting at 0: create a BitSet representing have we already generated this? and keep a running count of generated elements. This allows creating permutations of (range limit) more efficiently and without realizing all of the Integer objects at once, at the cost of having mutable state under the hood. Each iteration we generate k = (rand-int (- limit cnt)) and then walk the bitset, incrementing a counter n and decrementing k every time we see a zero in the bitset at position n. When k hits zero, we flip that bit of the bitset to 1 and output k; that is the next item in the lazy sequence. Memory complexity is limit/8 bytes instead of limit*12 bytes (Integer objects consume 12 bytes of memory each) for a space savings factor of 72, nearly two whole orders of magnitude, over using (distinct ...). However, this seems to work only for shuffling (range limit) ... or, we can use (map f (bitset-perm-of-range limit)) to get an arbitrary lazy permutation of the-hypothetical-sequence the same way! Time complexity is quadratic: we have to walk further and further along the bitset to generate each element. It still beats the (distinct ...) rejection algorithm when you (eventually) want most or all of the permutation, and especially when you want that two-order-of-magnitude memory savings. Both algorithms avoid the core shuffle's gamut problem when (factorial limit) exceeds Integer/MAX_VALUE; as long as limit itself doesn't exceed that there is no problem. First stab at an implementation: (defn bitset-perm-of-range [limit] (let [bs (java.util.BitSet. limit) rem (atom limit) step (fn step [] (lazy-seq (locking bs (if-not (zero? @rem) (let [k (rand-int @rem)] (loop [i 0 k k] (if (.get bs i) (recur (inc i) k) (if ( k 0) (recur (inc i) (dec k)) (do (.set bs i) (swap! rem dec) (cons i (step)))] (step))) It *seems* to work after very minimal testing on short ranges and one small chunk of a big range: = (bitset-perm-of-range 10) (0 7 4 1 8 6 5 3 2 9) = (bitset-perm-of-range 10) (2 8 1 5 0 3 9 4 7 6) = (bitset-perm-of-range 10) (5 9 2 1 4 3 7 6 8 0) = (take 10 (bitset-perm-of-range 100)) (113738 532538 423561 100835 157218 710244 339727 507963 199228 842555) -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- 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
Re: jdbc and postgresql type problem
On Jul 11, 7:48 am, Brian Carper briancar...@gmail.com wrote:
On Jul 10, 4:52 pm, Wilfred yowilf...@gmail.com wrote:
I'm at a bit of a loss. UPDATE comments SET approved='1' WHERE id =
'1' works fine in psql. approved is a boolean field, so is this an
issue with the SQL library producing incorrect SQL?
I think this is an oddity with the JDBC driver for PostgreSQL. The
driver doesn't seem to like doing automatic typecasting. Try this:
(sql/update-values :comments
[id = cast(? as integer) id]
;; alternatively id = ?::integer
{:approved true})
Or you could (Integer/parseInt id) to do the cast before you pass it
as parameter, though in either case you should validate your id before
casting, if you want to avoid dying on poorly-formed input.
--Brian
Perfect, many thanks.
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Results from 2011 State of Clojure survey
A few weeks ago, I opened the 2011 State of Clojure survey. As with last year’s survey, my aim was to take a snapshot of the Clojure community — our origins in aggregate, how and where we are using Clojure, and what needs to improve to help the community grow and prosper. The results are in: http://cemerick.com/2011/07/11/results-of-the-2011-state-of-clojure-survey/ Cheers, - 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: Results from 2011 State of Clojure survey
Great work Chas. Although I didn't take the survey, I'm one of those programmers coming from Java. Now I'm trying to transition to full-time Clojure work, usually telling everyone I know to take a look at it. Tim On Mon, Jul 11, 2011 at 5:22 PM, Chas Emerick cemer...@snowtide.com wrote: A few weeks ago, I opened the 2011 State of Clojure survey. As with last year’s survey, my aim was to take a snapshot of the Clojure community — our origins in aggregate, how and where we are using Clojure, and what needs to improve to help the community grow and prosper. The results are in: http://cemerick.com/2011/07/11/results-of-the-2011-state-of-clojure-survey/ Cheers, - 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: Build tool for mixed Clojure/Java projects
On Tue, Jul 5, 2011 at 6:35 AM, Stephen C. Gilardi squee...@mac.com wrote: I would argue that the ~/.m2 repository is nearly as easy to work with as any other local, on-disk scheme one might envision and has the benefit of working with any maven-compatible tool. It also works for arbitrary jars one may have on disk (acquired from any source) via: http://maven.apache.org/guides/mini/guide-3rd-party-jars-local.html Thanks. I had the same issue using some generated jar files and this worked. Here are the concrete commands I used to install the jars into m2. Posting it here in case someone else finds it useful. mvn install:install-file \ -DgroupId=com.sforce.soap \ -DartifactId=partner \ -Dversion=22 \ -Dfile=partner.jar \ -Dpackaging=jar \ -DgeneratePom=true -- 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
Using Clojure To Debug Java Apps
I have been using the Clojure REPL to debug a large Java server app.
It's great for exploratory testing and for validating assumptions
about how the system works. I wanted to post the code here in case
someone else finds this useful.
1. Stick this in a class that is loaded early in the server/app.
public static class Repl {
public static final String PORT = 18081;
public static final String NS = user;
private final String initResult; public String getInitResult() {
return initResult; }
public Object invoke(String fn) { try { return
clojure.lang.RT.var(NS, fn).invoke(); } catch (Exception e) { return
null; } }
public Object invoke(String fn, Object arg1) { try { return
clojure.lang.RT.var(NS, fn).invoke(arg1); } catch (Exception e) {
return null; } }
public Object invoke(String fn, Object arg1, Object arg2) { try {
return clojure.lang.RT.var(NS, fn).invoke(arg1, arg2); } catch
(Exception e) { return null; } }
public Object invoke(String fn, Object arg1, Object arg2, Object
arg3) { try { return clojure.lang.RT.var(NS, fn).invoke(arg1, arg2,
arg3); } catch (Exception e) { return null; } }
public Repl() {
String result;
try {
clojure.lang.Var eval = clojure.lang.RT.var(clojure.core, eval);
clojure.lang.Var read =
clojure.lang.RT.var(clojure.core, read-string);
String create_repl_server =
(do +
(use '[clojure.contrib.server-socket :only
[create-repl-server]]) +
(create-repl-server + PORT + ) + );
result = eval.invoke(read.invoke(create_repl_server)).toString();
} catch (Exception e) {
result = e.toString();
}
initResult = result;
}
}
public static final Repl REPL = new Repl();
2. Use this on the command line to start the REPL:
rlwrap --logfile $HOME/tmp/clj.log telnet localhost 18081
Now from the REPL you can create Java objects and call methods at will.
3. To call a Clojure function called some-function in user namespace
from Java, use something like this:
REPL.invoke(some-function, arg1));
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Re: Build tool for mixed Clojure/Java projects
On Mon, 11 Jul 2011 07:51:33 -0400 Ken Wesson kwess...@gmail.com wrote: On Sun, Jul 10, 2011 at 2:01 AM, mike.w.me...@gmail.com m...@mired.org wrote: [snip most of post whose sole purpose seems to be to gainsay anything I write] Because in that article, you were (unusual for you) way off base. The only source control system I know that uses an ACID database doesn't need a back end server. How exactly is this possible? Databases *are* servers. Database and DBMS are used more-or-less synonymously (when database isn't used more broadly than ACID/SQL/etc.) and the S in DBMS stands for server. SQL is to databases/clients as HTTP GET/POST syntax is to web servers/browsers. Etc. I explained it in the part you snipped, but I'll repeat it for you: it uses an embedded database. A database is *not* a server, it's an API. The API may well talk to a server - and most do - but there's no requirement that it do so. This particular embedded database is almost certainly the most popular SQL database in the world, with hundreds of millions of installations running worldwide. SQL doesn't have a position anything like HTTP GET/POST syntax. HTTP's GET/POST syntax is a wire protocol. Once you it, you can write code to talk to a server, and get a response. If you know SQL, you can't use a database *at all*. You have to know an API for the database in question - and if it's a server, have an implementation that talks it's wire protocol. ODBC provides a standard API, but not a wire protocol. Last time I looked, there wasn't a standard wire protocol for SQL servers. mike -- Mike Meyer m...@mired.org http://www.mired.org/ Independent Software developer/SCM 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: How to add jar files to leiningen projects?
I have seen this local JAR thing coming up far too often, so I sat down and wrote this: https://github.com/kumarshantanu/lein-localrepo Can somebody try this and let me know if it works? Regards, Shantanu On Jul 11, 11:35 pm, finbeu info_pe...@t-online.de wrote: Hi Phil, leiningen is really great. I haven't used maven before so I was really scratching my head. Would be great to have an option like this so I don't have to run mvn on the command line. Thanks! - Finn -- 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: Build tool for mixed Clojure/Java projects
On Mon, 11 Jul 2011 16:21:45 -0400 Ken Wesson kwess...@gmail.com wrote: So, repository does not imply server at all, This is getting silly. Repository is a word that brings immediately to mind typing checkin and checkout commands at a command prompt in order to work on source code that is stored remotely. And remotely implies server. I was with you until you said stored remotely. These days, I almost *never* do checkins or checkouts to a remote server - and I use four different source control systems on a regular basis: (hg, git, fossil perforce). The first three *cannot* do remote checkins or checkouts - they require the repository be stored on the local disk. The last one is the only one that behaves the way you describe - and it's a legacy system I'm trying to get rid of. mike -- Mike Meyer m...@mired.org http://www.mired.org/ Independent Software developer/SCM 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: Build tool for mixed Clojure/Java projects
On Jul 12, 4:24 am, Asim Jalis asimja...@gmail.com wrote: On Tue, Jul 5, 2011 at 6:35 AM, Stephen C. Gilardi squee...@mac.com wrote: I would argue that the ~/.m2 repository is nearly as easy to work with as any other local, on-disk scheme one might envision and has the benefit of working with any maven-compatible tool. It also works for arbitrary jars one may have on disk (acquired from any source) via: http://maven.apache.org/guides/mini/guide-3rd-party-jars-local.html Thanks. I had the same issue using some generated jar files and this worked. Here are the concrete commands I used to install the jars into m2. Posting it here in case someone else finds it useful. mvn install:install-file \ -DgroupId=com.sforce.soap \ -DartifactId=partner \ -Dversion=22 \ -Dfile=partner.jar \ -Dpackaging=jar \ -DgeneratePom=true I have posted about it on another thread too. Maybe you can give this a try (with Leiningen): https://github.com/kumarshantanu/lein-localrepo Regards, Shantanu -- 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: Results from 2011 State of Clojure survey
Nice analysis. A few remarks: * The results seem to confirm the arguments here that there's a problem with documentation and with the lack of a good starter kit. Making the command line REPL better might help in that regard too (tab completion would not even be too difficult, given Clojure's introspective capabilities; just prefix-matching against (map name (keys (ns-map *ns*))) should do a decent job. * Lisp is “oatmeal with fingernail clippings mixed in”? Who said that? WHAT?! LARRY $*@! WALL said it?! Well HE's hardly one to complain about Lisp's alleged readability deficits! :) * It would be nice to be able to see superpositions of last year's and this year's graphs somewhere, so the changes are made directly apprehensible to the eye, where applicable (same questions asked in both years). * How would you characterize your use of Clojure *today* -- you do know that HTML supports true italics, right? :) * What is the status of Clojure in your workplace -- the numbers sum to exactly 100, suggesting you made the options mutually exclusive. But the middle item potentially could have overlap with the ones directly above and directly below it and there are no I don't know or N/A type options showing in the output data. * Public relations -- Project status and activity. This area seems to suggest the main Clojure page should be covered in tickers and feeds of various kinds, but I'm not so sure about that. A lot of that stuff would be just so much clutter to a lot of users -- and others might find it *intimidating*: What the heck *is* all of this stuff? Am I expected to understand *all* of it before I can do anything useful with this thing?. Google gets by with a very spare main page -- no, in fact it's one of Google's major plus points. So there's certainly no rule that says success requires a cluttered main web page. My own ISP's main web page is a huge mess of stuff mostly irrelevant to why a customer would go to it -- random news tickers and other portally stuff that has nothing to do with Internet service status, checking your billing/usage/account setup, forwarding email while away, and the like, and finding the latter is a pain. There's also what's been said here about too many different possible starter kit configurations mentioned, like emacs+SLIME, Enclojure+NetBeans, Eclipse+CCW... -- wouldn't that apply more generally to any large globs of stuff on the front page? I'd suggest showing signs of activity in two main ways: one, list the five most recent posts of some developer blog that gets a new article every so often and two, possibly list the most recent few threads to get new posts in this mailing list and link to them at Google. And of course update the boilerplate cruft like the date on the page regularly -- but a script can do that automatically, or even dynamically generate the page with today's date. It's phony but it is probably effective and doesn't add clutter, and adding the two feeds I suggested doesn't add much and points people at this list and at current developer activity. A few more things maybe wouldn't hurt either, e.g. a Featured Library or Tip of the Week or some such, changed weekly. The developer blog, if adopted, should include at least two categories of items: development milestones achieved (particularly, decisions made, things implemented, and releases) and significant uptake events (this company/product/web service disclosed using Clojure, Heroku started supporting Clojure, etc.). ... so that people who wander into clojure.org can immediately have a positive impression, rather than requiring of them an analytical comprehension of Clojure’s minutiae? An argument could be made that Clojure is aimed more at those who do that sort of analytical comprehension than those looking for the latest jazzy fad, but an argument could also be made that attracting a broader base is good and jazzy fad is a straw-man argument. :) -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- 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: Results from 2011 State of Clojure survey
Ken Wesson kwess...@gmail.com writes: * How would you characterize your use of Clojure *today* -- you do know that HTML supports true italics, right? :) Obviously *today* is meant to be rebound to a new value in the future. -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: Build tool for mixed Clojure/Java projects
On Mon, Jul 11, 2011 at 7:39 PM, Mike Meyer m...@mired.org wrote: On Mon, 11 Jul 2011 07:51:33 -0400 Ken Wesson kwess...@gmail.com wrote: On Sun, Jul 10, 2011 at 2:01 AM, mike.w.me...@gmail.com m...@mired.org wrote: [snip most of post whose sole purpose seems to be to gainsay anything I write] Because in that article, you were (unusual for you) way off base. As you say, it would be unusual for me if that were the case -- good reason to suspect that perhaps I wasn't, but rather was misinterpreted, or something. SQL doesn't have a position anything like HTTP GET/POST syntax. Sure it does. Queries are bundled into a wire protocol and sent over the network in pretty much every system I've seen that used a database. You have the web server over *here*, and it is visible to the internet because the gateway forwards port 80 to it *here*; it talks over the LAN to the DBMS over *here* to run various queries and build a page to serve ... HTTP's GET/POST syntax is a wire protocol. HTTP is a wire protocol. The syntax of GET/POST requests is carried on that protocol (as are HTML files and other files sent back to the client) but is not the protocol itself. Once you it, you can write code to talk to a server, and get a response. Not if all you know is GET /index.html. You need to speak HTTP and then send that. If you know SQL, you can't use a database *at all*. You have to know an API for the database in question Just as you need to know HTTP and not just GET /index.html. The difference here is that the databases haven't all settled on one embedding, analogous to HTTP, for the SQL requests, but all the vendors use their own different one. Last time I looked, there wasn't a standard wire protocol for SQL servers. Which doesn't change much of anything. There's HTTP 1.0 and HTTP 1.1 for web servers for that matter, though mostly you can ignore the differences and, indeed, these days HTTP 1.0 as a whole. It's not hard to imagine a world where a non-HTTP protocol became a rival to HTTP, either -- for instance, one with built-in support for mirroring of static content instead of having to fudge around with things like Akamai for that, perhaps even one where individual browsers made parts of their caches (not https stuff, though, obviously, or form contents) available automatically as alternative sources to take some of the load off central servers and possibly even maintain some availability when they were down. If that were to happen, would the things that interpret GET requests suddenly stop qualifying for being considered to be servers? -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- 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: Build tool for mixed Clojure/Java projects
On Mon, Jul 11, 2011 at 7:51 PM, Mike Meyer m...@mired.org wrote: On Mon, 11 Jul 2011 16:21:45 -0400 Ken Wesson kwess...@gmail.com wrote: So, repository does not imply server at all, This is getting silly. Repository is a word that brings immediately to mind typing checkin and checkout commands at a command prompt in order to work on source code that is stored remotely. And remotely implies server. I was with you until you said stored remotely. Well, the source code is being worked on collaboratively by geographically separated people in many cases, and from multiple office cubicle computers in the most geographically-concentrated case. The canonical master version of the source code must reside in some single place, which can be at most one of those developers' computers; so for the rest of them, it's stored remotely. What's stored locally may range from a single file being worked on at a time to a copy of the whole code base, but there is still generally a master copy and there is still therefore some mechanism for updating the master copy and resolving edit conflicts that collide there. That mechanism requires the computer holding the non-master copy or single file to push its diffs to the computer holding the master copy (and then the latter is a server) or the computer holding the master copy to pull diffs from the others (and then all the REST are servers!). So not only is there a stored remotely in there out of necessity for anything but a single-developer-on-a-single-machine project, but there's also a server in there, or even multiple servers. The alternatives I can think of are: 1. One developer, one computer. Version control may be overkill in such a case anyway and it's not how big, major projects are developed. 2. Many developers, one computer. No remote storage and if the developers are co-located no server; otherwise a terminal server. The former is obviously not parallelizable (though edit conflicts are thus a non-issue -- single global lock FTW!!!1!1) and the latter is a throwback to the 1980s or earlier. :) 3. Many computers, one developer manually synching files or just carrying the codebase around on a thumbdrive. No servers, no remote storage that isn't simply overwritten when returned-to. The extra copies, if any, merely amount to backups. Most likely with a one-developer project with a tower and a laptop, or developing a phone app on a computer and on their phone. 4. An ad hoc, peer-to-peer system with many evolving versions of the codebase and patches swapped back and forth but no canonical master copy. This *might* be workable on a small project (a handful of developers, not too many LOC) but surely cannot scale much above that without becoming total chaos. There might be no server beyond email in such a case, used for exchanging diff files or whatever. But I expect any project organized that way to melt down above a fairly small size of codebase and/or developer headcount. Versions will become too divergent, the bigger and more numerous they are, until patches that worked on the sender's copy often won't work, or won't work without extensive modification, on the recipient's, and then the ability to share improvements begins to break down rapidly when that point is reached. In effect, the codebases begin to evolve into separate species that can no longer interbreed. Perhaps this is how bacteria, despite being able to share genes in horizontal transfer and acquire them after birth, nonetheless have distinct species -- they become incompatible for all but certain broad classes of plugin interface implementation patches such as, unfortunately, antibiotic-resistance genes. This could be made slightly more scalable by modularizing, specifying module interfaces, and letting the modules evolve separately, versioning each one by patch level, so the version of a module is bumped every time it's patched. Patches expected to be acquired and applied in order to keep each module up to date with everyone else's work. Obvious problem with patch-numbering collisions, where two developers hack on module Y and both produce distinct patch 1337s unaware of what the other is doing -- in other words, edit conflicts. Repositories that number every commit sort-of implement this, but with a master copy and a database of some sort tracking the changes and the commit numbers and some mechanism for resolving edit collisions. Collisions are also detected right away, since both developers will submit their changes to the central repository. In the peer-to-peer model each might deliver their own patch 1337 to a bunch of others and both could spread for a while among different subsets of the developers before eventually colliding in one developer's copy of module Y who receives one of the patches and then, later, the other. Before that, problems could arise if developer X talks to developer Z and gets patch 1338 for module Y, tries to apply it, and despite having patch 1337 it doesn't work
Re: Results from 2011 State of Clojure survey
On Mon, Jul 11, 2011 at 8:40 PM, Phil Hagelberg p...@hagelb.org wrote: Ken Wesson kwess...@gmail.com writes: * How would you characterize your use of Clojure *today* -- you do know that HTML supports true italics, right? :) Obviously *today* is meant to be rebound to a new value in the future. ROFL... (doto (Thread. #(loop [] (Thread/sleep 8640) (set! *today* (Date.)) (recur))) (.start))? -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- 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: How to add jar files to leiningen projects?
Shantanu Kumar kumar.shant...@gmail.com writes: I have seen this local JAR thing coming up far too often, so I sat down and wrote this: https://github.com/kumarshantanu/lein-localrepo Can somebody try this and let me know if it works? Did some simple tests on it and it looks like it works fine. Thanks for putting this together! Very nicely done. -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: How to add jar files to leiningen projects?
It works for me on OS X (at least install does), however, it requires you to be in a project directory to use. Not really an inconvenience, but it may not be completely obvious to a user installing with the intention of using the dependency in multiple projects that they won't need to repeat this in each project directory. It would be ideal if it could be run outside of the project structure, as would be the case if an additional arity was added to the install function in leiningen.install. - Mark On Mon, Jul 11, 2011 at 7:41 PM, Shantanu Kumar kumar.shant...@gmail.comwrote: I have seen this local JAR thing coming up far too often, so I sat down and wrote this: https://github.com/kumarshantanu/lein-localrepo Can somebody try this and let me know if it works? Regards, Shantanu On Jul 11, 11:35 pm, finbeu info_pe...@t-online.de wrote: Hi Phil, leiningen is really great. I haven't used maven before so I was really scratching my head. Would be great to have an option like this so I don't have to run mvn on the command line. Thanks! - Finn -- 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: How to add jar files to leiningen projects?
You can copy your jars in the project/lib directory and add the :disable-implicit-clean true option to your project.clj file. Leiningen will not delete your jars while building the project. On Jul 11, 6:23 pm, finbeu info_pe...@t-online.de wrote: Hello, I have some external jar libaries that I need to import in my clojure namespace. As I just started to use leinigen, I don't understand how to add them to my project. Let's say the library resides in c:\temp\jars\mylib.jar How do I add this properly to mein leinigen project? (defproject myproject 1.0.0-SNAPSHOT :description FIXME: write description :dependencies [[org.clojure/clojure 1.2.1] [org.clojure/clojure-contrib 1.2.0] [WHAT TO PUT IN HERE?]]) I assume I have to put that to .m2 repository but how? Thanks. - Finn -- 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
Ring+Swank
Hi all, I'd like to make a web-app to which I could connect using slime and make some changes there while the application is still running. How to start Swank-server from the working Ring-application? -- 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: Results from 2011 State of Clojure survey
Hi, Am Dienstag, 12. Juli 2011 02:36:34 UTC+2 schrieb Ken Wesson: An argument could be made that Clojure is aimed more at those who do that sort of analytical comprehension than those looking for the latest jazzy fad, but an argument could also be made that attracting a broader base is good and jazzy fad is a straw-man argument. :) Maybe clojure is not directly aimed at those analytical guys, but simply made by one. So Rich maybe just doesn't see a problem? 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
