Re: Writing a simple nrepl middleware and client
It looks like your connection is broken somehow, this might be caused by an
OS level issue(firewall etc.) but not the application itself. To test if
this is due to an OS level issue, I suggest you to try connect nREPL by
telnet, here's how to start nREPL in a TTY mode, in any REPL session type
following:
-
(use 'clojure.tools.nrepl.server)
(require '[clojure.tools.nrepl.transport :as t])
(*defonce* server (start-server :transport-fn t/tty :port 999))
-
then use telnet to connect to your new started nREPL server: telnet
localhost 999.
In my opinion, if you can get through by this way, then it's the app issue;
otherwise it may caused by OS setting/issue.
I wrote a small nREPL client(but in Lua:
https://github.com/xiejianming/lua_nrepl_client) before. Something might
cause your interest is that, by using this tool, you can check bencoded
(default encoding protocol used by nREPL) messages sent by nREPL server
directly; and you can also check something I call naked message from
server. Just hope this will help you a little bit
在 2012年12月27日星期四UTC+8上午6时55分53秒，frye写道：
Hi all,
I'm trying to put together some nrepl
middlewarehttps://github.com/clojure/tools.nrepl#middleware.
To get a basic understanding, I thought I would implement some simple nrepl
middleware in a test project as seen in *A)*. I can execute `M-x
nrepl-jack-in`. But executing the client, gives me an empty result
(`repl/response-values` pulls nil out of ()). So I tried a bare bones
communication example in the middleware
pagehttps://github.com/clojure/tools.nrepl#talking-to-an-nrepl-endpoint-programmatically
(see *B*), but am still getting an error.
I like the example
givenhttps://github.com/technomancy/leiningen/blob/master/sample.project.clj#L138in
the leiningen sample project. But it seems I need to get the basics
working in *A)* and *B)*, first.
Any insights here? Ultimately, I would like to create nrepl middleware for
i) Clojurescript compilation (*cljsbuild auto* (yes, I've already looked
at *hiredman/nrepl-cljs-middleware*)) and ii) a browser-connected repl
(*cljsbuild
repl-listen*). I want to have these facilities in a `*M-x nrepl-jack-in*`
session.
*A) basic nrepl middleware*
- project.clj (https://www.refheap.com/paste/7875)
- middleware.clj (https://www.refheap.com/paste/7874)
- client.clj (https://www.refheap.com/paste/7876)
*B) lein repl*
$ lein new thing
...
$ cd thing/
$ lein repl
nREPL server started on port 38789
...
user= (require '[clojure.tools.nrepl :as repl])
nil
user=
user= (with-open [conn (repl/connect :port 38789)]
#_= (- (repl/client conn 1000)
#_=(repl/message {:op eval :code (+ 2 3)})
#_=repl/response-values))
Exception in thread nREPL-worker-2 nil
user= java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at clojure.tools.nrepl.transport$bencode$fn__214.invoke(transport.clj:81)
at clojure.tools.nrepl.transport.FnTransport.send(transport.clj:27)
at
clojure.tools.nrepl.middleware.pr_values$pr_values$fn$reify__479.send(pr_values.clj:23)
at
clojure.tools.nrepl.middleware.interruptible_eval$interruptible_eval$fn__536$fn__538.invoke(interruptible_eval.clj:171)
at clojure.core$comp$fn__4034.invoke(core.clj:2278)
at
clojure.tools.nrepl.middleware.interruptible_eval$run_next$fn__529.invoke(interruptible_eval.clj:137)
at clojure.lang.AFn.run(AFn.java:24)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Thanks in advance
Tim Washington
Interruptsoftware.ca
--
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: Anonymous Macros
May I know in what circumstances would an anonymous macro be applied? - I just don't think there's a way to define anonymous macro but maybe we can make a workaround by manipulating the macro syntax... 在 2012年11月7日星期三UTC+8上午8时17分37秒，Sean Neilan写道： Is there any way to write an anonymous macro in Clojure? This post: http://stackoverflow.com/questions/4074961/anonymous-macros-in-clojure says it's possible with some hacks and in version 1.3 Clojure will have some kind of support for this. Thank you for your time. -Sean -- 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: Anonymous Macros
Well, logically the difference between a function and macro is just that the parameters will be evaluated in a function call but will not in a macro call. I suppose you can use anonymous function to achieve what you may want in a LET statement. And as SunNing said, Clojure will use meta tag :macro true of *Var* to identify a macro, but those var-look things defined within LET bindings are not *Vars*(they called locals?), I guess we are not able to make any 'anonymous macros' there. Maybe you can give us a more specific scenario of your requirement so that we can figure out how to make it work without 'anonymous macros'. 在 2012年11月7日星期三UTC+8上午11时12分24秒，Sean Neilan写道： I was hoping to write a macro inside of a let statement. The macro would be returned from the let and keep closures to whatever was defined in the let. Also, if possible, define multiple global macros inside of a let statement so it's as if the let is returning multiple values. On Tue, Nov 6, 2012 at 9:07 PM, jaime xieji...@gmail.com javascript:wrote: May I know in what circumstances would an anonymous macro be applied? - I just don't think there's a way to define anonymous macro but maybe we can make a workaround by manipulating the macro syntax... 在 2012年11月7日星期三UTC+8上午8时17分37秒，Sean Neilan写道： Is there any way to write an anonymous macro in Clojure? This post: http://stackoverflow.com/**questions/4074961/anonymous-** macros-in-clojurehttp://stackoverflow.com/questions/4074961/anonymous-macros-in-clojure says it's possible with some hacks and in version 1.3 Clojure will have some kind of support for this. Thank you for your time. -Sean -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: 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: generate two defns in macro
I don't see there's a way to eliminate out most parenthesis like this either. Maybe you can try to spit them out to somewhere and then read them back again...but you probably don't want to do this. ;-) 在 2012年8月21日星期二UTC+8下午11时00分31秒，Maris写道： Nothing is wrong with do block.I just thought maybe there is some trick Fair enough. On Tuesday, 21 August 2012 15:55:04 UTC+1, lpetit wrote: Hello, What's wrong with having 2 fns inside the top level do ? In Clojure, top level dos are split so that their children forms are evaluated in sequence, as if you would have written them without the do. HTH, -- Laurent 2012/8/21 Maris maris.o...@gmail.com I want a macro that generates two defn's. (defn vote-suspend [this] (deref (.state this))) (defn vote-resume [this state] (reset! (.state this) state)) I have written this: (defmacro suspendable [prefix] `(do (defn ~(symbol (str prefix suspend)) [~'this] (deref (.state ~'this))) (defn ~(symbol (str prefix resume)) [~'this ~'state] (reset! (.state ~'this) ~'state It works but it has both defn's in *do *block*.* (*do* (clojure.core/defn vote-suspend [this] (clojure.core/deref (.state this))) (clojure.core/defn vote-resume [this state] (clojure.core/reset! (.state this) state))) is it possible to generate defn's without *do* ? I tried this: (defmacro suspendable [prefix] (list `(defn ~(symbol (str prefix suspend)) [~'this] (deref (.state ~'this))) `(defn ~(symbol (str prefix resume)) [~'this ~'state] (reset! (.state ~'this) ~'state But it creates parentheses around defn: user (macroexpand-1 '(suspendable vote-)) ((clojure.core/defn vote-suspend [this] (clojure.core/deref (.state this))) (clojure.core/defn vote-resume [this state] (clojure.core/reset! (.state this) state))) Maybe splice it? (defmacro suspendable [prefix] ~@(list `(defn ~(symbol (str prefix suspend)) [~'this] (deref (.state ~'this))) `(defn ~(symbol (str prefix resume)) [~'this ~'state] (reset! (.state ~'this) ~'state *Attempting to call unbound fn: #'clojure.core/unquote-splicing* *unquote-splicing* must be inside syntax-quote block, right ? This creates parentheses again: (defmacro suspendable [prefix] `( ~@(list `(defn ~(symbol (str prefix suspend)) [~'this] (deref (.state ~'this))) `(defn ~(symbol (str prefix resume)) [~'this ~'state] (reset! (.state ~'this) ~'state) Is it not possible to return two sexp's from a macro ? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@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+u...@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
why does Clojure need to cache keywords?
Hello,
When I read the source code keyword, say, Keyword.java (V1.3), I found that
when we intern a keyword, (if I understand it correctly) it uses a
cache for keywords:
=
public static Keyword intern(Symbol sym) {
if (sym.meta() != null)
sym = (Symbol) sym.withMeta(null);
*Util.clearCache(rq, table);*
Keyword k = new Keyword(sym);
ReferenceKeyword existingRef = table.putIfAbsent(sym,
new WeakReferenceKeyword(k, rq));
if (existingRef == null)
return k;
Keyword existingk = existingRef.get();
if (existingk != null)
return existingk;
// entry died in the interim, do over
table.remove(sym, existingRef);
return intern(sym);
}
==
well, I just don't understand why we need caching for keywords. Anyone
could give me a hint?
--
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: why does Clojure need to cache keywords?
I doubt because keyword will use its internal Symbol object to compare with
each other (or other objects), it means it's Symbol's interned strings(ns
name) make the comparison fast but not this caching stuff. I found a
find() method in source code but not sure if the cache is relevant to
this method.
在 2012年7月18日星期三UTC+8下午4时52分25秒，dennis写道：
Compare keywords can be very fast.
在 2012-7-18 PM4:51，jaime xiejianm...@gmail.com写道：
Hello,
When I read the source code keyword, say, Keyword.java (V1.3), I found
that when we intern a keyword, (if I understand it correctly) it uses
a cache for keywords:
=
public static Keyword intern(Symbol sym) {
if (sym.meta() != null)
sym = (Symbol) sym.withMeta(null);
*Util.clearCache(rq, table);*
Keyword k = new Keyword(sym);
ReferenceKeyword existingRef = table.putIfAbsent(sym,
new WeakReferenceKeyword(k, rq));
if (existingRef == null)
return k;
Keyword existingk = existingRef.get();
if (existingk != null)
return existingk;
// entry died in the interim, do over
table.remove(sym, existingRef);
return intern(sym);
}
==
well, I just don't understand why we need caching for keywords. Anyone
could give me a hint?
--
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: why does Clojure need to cache keywords?
make senseI just came up with this similar answer on my way
home...Thanks.
在 2012年7月18日星期三UTC+8下午6时56分42秒，dennis写道：
I think this cache is just the same with String.intern method in java,it
just want to reduce the cost (memory cpu) of producing keywords
frequently especial when using them with map structure.
2012/7/18 jaime xiejianm...@gmail.com
I doubt because keyword will use its internal Symbol object to compare
with each other (or other objects), it means it's Symbol's interned
strings(ns name) make the comparison fast but not this caching stuff. I
found a find() method in source code but not sure if the cache is
relevant to this method.
在 2012年7月18日星期三UTC+8下午4时52分25秒，dennis写道：
Compare keywords can be very fast.
在 2012-7-18 PM4:51，jaime xiejianm...@gmail.com写道：
Hello,
When I read the source code keyword, say, Keyword.java (V1.3), I found
that when we intern a keyword, (if I understand it correctly) it uses
a cache for keywords:
==**===
public static Keyword intern(Symbol sym) {
if (sym.meta() != null)
sym = (Symbol) sym.withMeta(null);
*Util.clearCache(rq, table);*
Keyword k = new Keyword(sym);
ReferenceKeyword existingRef = table.putIfAbsent(sym,
new WeakReferenceKeyword(k, rq));
if (existingRef == null)
return k;
Keyword existingk = existingRef.get();
if (existingk != null)
return existingk;
// entry died in the interim, do over
table.remove(sym, existingRef);
return intern(sym);
}
==**
well, I just don't understand why we need caching for keywords. Anyone
could give me a hint?
--
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+unsubscribe@**googlegroups.comclojure%2bunsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/**group/clojure?hl=enhttp://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
--
庄晓丹
Email:killme2...@gmail.com xzhu...@avos.com
Site: http://fnil.net
Twitter: @killme2008
--
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: interests in Clojure internals
I glanced at the contents and it looks like this is a cool thing that I'm looking for. I will spend some time on it. Thank you Ken. BTW, how can I view the second link (ending with .pamphlet) in a browser? I tried it in Chrome but it just gave me a plain text without any format. 在 2012年6月7日星期四UTC+8下午8时55分07秒，Ken Causey写道： On Thu, Jun 7, 2012 at 3:41 AM, jaime xiejianm...@gmail.com wrote: Hello everyone, I really have interests in internals of Cojure. I'm not talking about massive details of its implementation but rather some kind of overview/architecture of the language itself. I also know that reading source code is one of the best ways to understand it but it's not easy for me to start because I don't have a big picture. Is there any introduction articles/books online that could be reached? even a few pieces that talk about its internal could be great helps too. Or maybe some materials/books about language/compiler designing could help me better understand these stuffs?? While I think the project is still in a very incomplete stage you can find quite a bit of information in Tim Daly's re-organization of the Clojure source code in literate form: http://daly.axiom-developer.org/clojure.pdf http://daly.axiom-developer.org/clojure.pamphlet Thanks, Jaime -- 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
interests in Clojure internals
Hello everyone, I really have interests in internals of Cojure. I'm not talking about massive details of its implementation but rather some kind of overview/architecture of the language itself. I also know that reading source code is one of the best ways to understand it but it's not easy for me to start because I don't have a big picture. Is there any introduction articles/books online that could be reached? even a few pieces that talk about its internal could be great helps too. Or maybe some materials/books about language/compiler designing could help me better understand these stuffs?? Thanks, Jaime -- 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: Which emacs packages?
Ha~! :) :) 在 2012年3月13日星期二UTC+8下午12时50分06秒，Cedric Greevey写道： On Mon, Mar 12, 2012 at 11:09 PM, jaime xiejianm...@gmail.com wrote: Is there any materials to introduce how to setup emacs env for a beginner? Yes, this single word: Don't. :) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Which emacs packages?
Is there any materials to introduce how to setup emacs env for a beginner? 在 2012年3月9日星期五UTC+8上午2时06分49秒，Tassilo Horn写道： AndyK andy.kri...@gmail.com writes: Curious about which emacs packages folks use for increased Clojure productivity (beyond the obvious, like slime/swank-clojure)... For any lisp: - paredit http://www.emacswiki.org/emacs/ParEdit - highlight-parentheses http://www.emacswiki.org/emacs/HighlightParentheses For any programming: - highlight-symbol http://www.emacswiki.org/emacs/HighlightSymbol 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: Performance of thread-local binding
Interesting
在 2012年3月4日星期日UTC+8上午8时56分56秒，Mikhail Kryshen写道：
If I understand Clojure's dynamic vars correctly, in a context where some
var *bar* is already thread-bound, the following code:
(binding [*bar* new-val]
(foo))
is semantically equivalent to:
(let [old-val *bar*]
(set! *bar* new-val)
(try
(foo)
(finally
(set! *bar* old-val
The latter version appears to be 3 to 4 times faster if (foo) does nothing.
The binding macro in the first version expands to something like:
(push-thread-bindings (hash-map (var *bar*) new-val))
(try
(foo)
(finally (pop-thread-bindings)))
So the binding macro uses some stack implementation instead of just
remembering the old value on the JVM call stack like the faster version
does. I am probably missing something, but why do dynamic vars need to
have their own stack for bindings?
Also I noticed that replacing (hash-map (var *bar*) new-val) with
{(var *bar*) new-val} in the above macro expansion makes it about 1.5-2
times faster. This could also be fixed in the source of the binding
defmacro by changing the following line:
(push-thread-bindings (hash-map ~@(var-ize bindings)))
to:
(push-thread-bindings ~(apply hash-map (var-ize bindings)))
--
Mikhail
--
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: Struggling in making a sub-process work in an interactive way
Well actually I also tried commons-exec but it's the same as clojure.java.shell - they run system command directly, after execution they return and terminate. That's not the way I want On Jan 13, 2:42 am, Denis Labaye denis.lab...@gmail.com wrote: Hi, In Java you would do it with common-exec:http://commons.apache.org/exec/ So add the deps to your project.clj : :dependencies [[org.apache.commons/commons-exec 1.1]] And use Clojure's Java interop. Keep us posted, I will need to do the same thing soon :) Denis On Wed, Jan 11, 2012 at 4:05 AM, jaime xiejianm...@gmail.com wrote: I didn't read your code carefully yet but I think you're meaning to copy streams between my Clojure code and the sub-process, actually I've tried this but this is probably not what I want. I might not make myself clear. So here I go again: 1. I writing a program which will open an OS shell (that means cmd under Windows and bash under Linux) as sub-process 2. this shell thing will not terminate while my code is still running, all system commands such as dir/ls/cat etc. will be thrown into the shell's input-stream to execute and the result is pulled from shell's output-stream/err-stream 3. because when the shell will finish its execution is unpredictable, I chained an echo stop-sign command to original command so that the program can get the sign when execution done. E.g. for command dir, I will throw dir echo stop-sign to the shell, when a stop-sign is captured then it knows the execution finished 4. it works well so far but when the system command is interactive one such as 'time' (in Windows), the program will hang; if there are ways to know when to require user input then I can resolve this in the code, but the answer is NO. I didn't find a way to detect this 5. thus I tried to find out any workarounds but failed. I also tried the way you mentioned here, it can work in an interactive way but in this case I cannot get the control back. That's all the things I'm struggling on... On Jan 10, 4:54 pm, Alan Malloy a...@malloys.org wrote: On Jan 9, 9:24 pm, Phil Hagelberg p...@hagelb.org wrote: jaime xiejianm...@gmail.com writes: Later on I tried to add code that can make this possible but I found there's no way to detect if a command requires user's input and thus I have to find another way to make it work - but I didn't success and have been struggling for a workaround for a long while anyone has any idea? As far as I know this is impossible to do without bringing in third-party libraries; this is just a (rather serious) shortcoming of the JDK. I haven't looked into it enough to know which libraries would offer it though. This should be possible if you don't mind suiciding your own process's stdin/stdout, by blindly forwarding all your input and output through the child. But if you send the child some input it didn't need, and it terminates, and then later you need your own stdin again, some pieces will be missing. I was going to attach a simple proof of concept to this, but I can't seem to get it right. So instead, here's what I was trying to do, and if someone wants to take it up this might be something useful to work from: (ns fork.core (:require [clojure.java.io :as io]) (:import (java.io PipedReader PipedWriter)) (:gen-class)) (defn -main [ args] (println Start typing, I'll cat it back atcha!) (let [child (- (Runtime/getRuntime) (.exec /bin/cat)) cin (.getInputStream child) cout (.getOutputStream child) in-pipe-in (PipedReader.) in-pipe-out (PipedWriter. in-pipe-in) out-pipe-in (PipedReader.) out-pipe-out (PipedWriter. out-pipe-in) in *in*, out *out*] ;; avoid dynamic-binding issues (future (io/copy in in-pipe-out)) ;; read my stdin... (future (io/copy in-pipe-in cout)) ;; write it to child's stdin (future (io/copy cin out-pipe-out)) ;; read child's stdout... @(future (io/copy out-pipe-in out)) ;; write it to my stdout, and wait for it to finish (let [exit-code (.waitFor child)] (println Child process finished with exit code exit-code) exit-code))) -- 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
Re: Struggling in making a sub-process work in an interactive way
I didn't read your code carefully yet but I think you're meaning to copy streams between my Clojure code and the sub-process, actually I've tried this but this is probably not what I want. I might not make myself clear. So here I go again: 1. I writing a program which will open an OS shell (that means cmd under Windows and bash under Linux) as sub-process 2. this shell thing will not terminate while my code is still running, all system commands such as dir/ls/cat etc. will be thrown into the shell's input-stream to execute and the result is pulled from shell's output-stream/err-stream 3. because when the shell will finish its execution is unpredictable, I chained an echo stop-sign command to original command so that the program can get the sign when execution done. E.g. for command dir, I will throw dir echo stop-sign to the shell, when a stop-sign is captured then it knows the execution finished 4. it works well so far but when the system command is interactive one such as 'time' (in Windows), the program will hang; if there are ways to know when to require user input then I can resolve this in the code, but the answer is NO. I didn't find a way to detect this 5. thus I tried to find out any workarounds but failed. I also tried the way you mentioned here, it can work in an interactive way but in this case I cannot get the control back. That's all the things I'm struggling on... On Jan 10, 4:54 pm, Alan Malloy a...@malloys.org wrote: On Jan 9, 9:24 pm, Phil Hagelberg p...@hagelb.org wrote: jaime xiejianm...@gmail.com writes: Later on I tried to add code that can make this possible but I found there's no way to detect if a command requires user's input and thus I have to find another way to make it work - but I didn't success and have been struggling for a workaround for a long while anyone has any idea? As far as I know this is impossible to do without bringing in third-party libraries; this is just a (rather serious) shortcoming of the JDK. I haven't looked into it enough to know which libraries would offer it though. This should be possible if you don't mind suiciding your own process's stdin/stdout, by blindly forwarding all your input and output through the child. But if you send the child some input it didn't need, and it terminates, and then later you need your own stdin again, some pieces will be missing. I was going to attach a simple proof of concept to this, but I can't seem to get it right. So instead, here's what I was trying to do, and if someone wants to take it up this might be something useful to work from: (ns fork.core (:require [clojure.java.io :as io]) (:import (java.io PipedReader PipedWriter)) (:gen-class)) (defn -main [ args] (println Start typing, I'll cat it back atcha!) (let [child (- (Runtime/getRuntime) (.exec /bin/cat)) cin (.getInputStream child) cout (.getOutputStream child) in-pipe-in (PipedReader.) in-pipe-out (PipedWriter. in-pipe-in) out-pipe-in (PipedReader.) out-pipe-out (PipedWriter. out-pipe-in) in *in*, out *out*] ;; avoid dynamic-binding issues (future (io/copy in in-pipe-out)) ;; read my stdin... (future (io/copy in-pipe-in cout)) ;; write it to child's stdin (future (io/copy cin out-pipe-out)) ;; read child's stdout... @(future (io/copy out-pipe-in out)) ;; write it to my stdout, and wait for it to finish (let [exit-code (.waitFor child)] (println Child process finished with exit code exit-code) exit-code))) -- 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
Struggling in making a sub-process work in an interactive way
Hello there, I'm writing some code, int my code it does following things (under Windows): 1. create a sub-process by (.exec (Runtime/getRuntime) cmd) named shell 2. get input-stream, output-stream and err-stream from the shell object 3. send commands to shell by dropping line into the output-string then get any result from input-stream/err-stream now it works fine for NON-interactive command such as dir or help, but it will hang when I send the shell commands that require user input, such as time. I think the reason is that my code doesn't detect any input requirement so the shell keep waiting for an input infinitely. Later on I tried to add code that can make this possible but I found there's no way to detect if a command requires user's input and thus I have to find another way to make it work - but I didn't success and have been struggling for a workaround for a long while anyone has any idea? Thanks, Jaime -- 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: want to make a 'debug' function, how to get current source and line number?
Wow yes, by using *print-length* I can control the amount of items to be printed in a collection. That's cool, thank you. On 12月17日, 上午7时34分, Cedric Greevey cgree...@gmail.com wrote: 2011/12/16 jaime xiejianm...@gmail.com: Yes this is a good point, but how can I avoid this blowing up problem if I'm not handling a single variable (just as the code in my last post)? Someone else indicated that just using pr-str and using the *print-length* and *print-level* vars can avoid the problem. Or, you could map my (if ...) expression over all of the variables. -- 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: want to make a 'debug' function, how to get current source and line number?
Thank all of you for the information. I finally picked up an approach of using form and *file*, and here's my code snippet of the function: == (defmacro debug Print debug info. [ variables] (let [datetime 2011-12-17 01:59:37 naked-msg (str Debug: datetime in *file* @ (:line (meta form)))] (if (empty? variables) (println naked-msg) `(let [kvs# (zipmap (map #(str % =) '~variables) (vector ~@variables))] (println (str ~naked-msg :) kvs#) == Basically it works for me now.But yes, in my code I don't know how to avoid blowing up problem if there's any loong seq variable there being debugged - if you have any ideas about fixing this issue, please let me know. And about the tricky thing by using exception to capture file name line number - even though it's also the first idea came into my mind but - I didn't tried that way because I think this might not be a good solution. Comparing with using form, which solution would you prefer and why? (I prefer to use form because I think this is more efficient (but I don't have a proof.)) On 12月15日, 下午1时48分, jaime xiejianm...@gmail.com wrote: Hello there, I want to write a function named debug which will print out date- time msg + current source-line + etc. info, but I don't know how to get the current source and line number of the running point (just like what REPL does when encounter any exceptions) ... Got any ideas? Thanks! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: want to make a 'debug' function, how to get current source and line number?
Yes this is a good point, but how can I avoid this blowing up problem if I'm not handling a single variable (just as the code in my last post)? On 12月16日, 上午5时09分, Cedric Greevey cgree...@gmail.com wrote: On Thu, Dec 15, 2011 at 1:54 PM, Alan Malloy a...@malloys.org wrote: This will print all the debug information at compile time, which is usually not what you want. I have a little macro I use called ?, which looks like: (defmacro ? [x] `(let [x# ~x] (prn '~x '~'is x#) x#)) You could add file and line information to this fairly simply: (defmacro ? [x] (let [line (:line (meta form)) file *file*] `(let [x# ~x] (println (pr-str '~x) is (pr-str x#) (str ; ( ~file : ~line ))) x#))) And use it like so: user (let [x 10] (+ 5 (? x))) x is 10 ; (NO_SOURCE_FILE:1) 15 You might want to change (pr-str x#) to something like (pr-str (if (seq? x#) (let [s (Object.)] (if (= (nth x# 11 s) s) x# (concat (take 10 x#) ['...]))) x#)) which will print sequences longer than ten elements as (1 2 3 4 5 6 7 8 9 10 ...) and prevent infinite seqs from blowing things up. Or more generally you might want to go through pprint which lets you set *print-len* and *print-level* to generally control the printing of very large and/or deeply-nested structures. But that adds a new dependency that needs to be required anywhere you use the macro ... -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: want to make a 'debug' function, how to get current source and line number?
Great! that's exactly what I want. Thank you! This is the first time I meet form, is there any document about this 'form' or relevant things? On 12月15日, 下午9时19分, Jay Fields j...@jayfields.com wrote: This should get you started: (defmacro debug [x] (println x) (println (pr-str form)) (println *file*) (println (meta form))) On Thu, Dec 15, 2011 at 12:48 AM, jaime xiejianm...@gmail.com wrote: Hello there, I want to write a function named debug which will print out date- time msg + current source-line + etc. info, but I don't know how to get the current source and line number of the running point (just like what REPL does when encounter any exceptions) ... Got any ideas? Thanks! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
want to make a 'debug' function, how to get current source and line number?
Hello there, I want to write a function named debug which will print out date- time msg + current source-line + etc. info, but I don't know how to get the current source and line number of the running point (just like what REPL does when encounter any exceptions) ... Got any ideas? Thanks! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Lookup on a symbol?
But we still don't know why it behaves like this and for what
reason. does (:a 1 2) returns 2 make any sense??
On Nov 24, 3:30 pm, Sean Corfield seancorfi...@gmail.com wrote:
On Wed, Nov 23, 2011 at 9:48 PM, Alan Malloy a...@malloys.org wrote:
Other way round. It behaves like a keyword, looking itself up in a
map:
('x '{x 1 y 2}) yields 2. You see the same behavior with (reduce :and
[5 10]), yielding 10.
Ah... I didn't realize that the lookup could be done without an
exception on non-collections!
(:a 1 2) yields 2 which surprises me a bit... I'd expect an error
because 1 is not a collection that :a can look itself up in.
Learn something new every day! :)
--
Sean A Corfield -- (904) 302-SEAN
An Architect's View --http://corfield.org/
World Singles, LLC. --http://worldsingles.com/
Perfection is the enemy of the good.
-- Gustave Flaubert, French realist novelist (1821-1880)
--
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: (dir *ns*) doesn't work??
Oh yes you guys are right. I should have look at the source first: (defmacro dir Prints a sorted directory of public vars in a namespace [nsname] `(doseq [v# (dir-fn '~nsname)] (println v#))) from it, we can see the quote thing. Thank you all. I got it now! On Oct 27, 5:12 pm, Ben Smith-Mannschott bsmith.o...@gmail.com wrote: dir is a macro. It doesn't evaluate its arguments. So when you say (dir *ns*), Clojure sees: show me what's in the namespace named *ns*, and there is no such namespace because *ns* is the name of a variable which contains the name of the current namespace. Dir is this way because for interactive use, it's convenient not to have to quote the symbol naming the namespace. So (dir user) and (dir clojure.core) should work. In your situation you'll want to call dir-fn, which is a function that will evaluate its arguments, so: if we assume (= *ns* 'user) (i.e. you're currently in the namespace user) (dir-fn *ns*) is equivalent to (dir-fn 'user) and (dir user) HTH // Ben On Thu, Oct 27, 2011 at 10:57, jaime xiejianm...@gmail.com wrote: Hi there, when I tried to execute (dir *ns*) in REPL, I found it doesn't work -- with exception of: Exception No namespace: *ns* found clojure.core/the-ns (core.clj:3689) I'm not sure if I used it the right way. Following are my execution tries: = Clojure 1.3.0 user= (doc dir) - clojure.repl/dir ([nsname]) Macro Prints a sorted directory of public vars in a namespace nil user= (dir *ns*) Exception No namespace: *ns* found clojure.core/the-ns (core.clj: 3689) user= *ns* #Namespace user user= (the-ns *ns*) #Namespace user user= (the-ns 'user) #Namespace user user= = Any suggestions?? -- 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: repl output for list seems inconsistent and a holdover from yesteryear
More reasonable..
On Oct 27, 7:15 am, Stuart Halloway stuart.hallo...@gmail.com wrote:
checking out the Try Clojure:
if you type the following, you get output that matches what you typed
in every case except for lists.
Vectors: -- [1 2 3 4]
[1 2 3 4]
Maps: -- {:foo bar 3 4}
{:foo bar 3 4}
Lists: -- '(1 2 3 4)
(1 2 3 4) - *INCONSISTENT* why not render this as '(1 2 3 4) ...
this would make much more sense to newbies.
Sets: -- #{1 2 3 4}
#{1 2 3 4}
This is an interesting question. Consistency is important, but consistency
with what? Your mental model for what happens at the REPL needs to keep the
R, E, and P steps clearly separate.
Working backward: the P (Print) prints things in a way that they can be read
back, where possible:
(read-string [1 2 3 4])
= [1 2 3 4]
(read-string (1 2 3 4))
= (1 2 3 4)
(read-string #{1 2 3 4})
= #{1 2 3 4}
(read-string {1 2 3 4})
= {1 2, 3 4}
If the P part of the REPL put a tick in front of lists, they would not read
back correctly:
(read-string '(1 2 3 4))
= (quote (1 2 3 4)) INCONSISTENT
Now to the R (Reader) part. If, as you suggest, the tick were part of the
reader syntax for lists, you could fix the inconsistency above:
;; hypothetical Clojure with '(...) list literals
(read-string ' '(1 2 3 4))
= (1 2 3 4)
Finally, consider the poor E (Evaluator) in this scenario. The evaluator
must (1) evaluate lists except (2) *not* evaluate lists that are protected by
quote. But now that the tick is part of the syntax you have two challenges:
(1) Since the tick no longer prevents evaluation, you have to spell out the
quote (and still use the tick!)
;; hypothetical literal list
(quote '(1 2 3))
(2) Since the tick is required as part of list syntax, your programs have to
be written with ticks everywhere like this:
'(defn hello-world
[]
'(println hello)
You have to understand R, E and P as separate steps to understand the REPL.
As a side note, it is worth mentioning that the REPL is composed of three
simple parts, and that interactive shells that do not have this factoring are
much less useful. Imagine if your language didn't separate reading and
evaluating. You would need JSON or something to serialize data...
Stu
Stuart Halloway
Clojure/corehttp://clojure.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
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: Literate programming
is there a place introducing (e.g. overview) more about Literate? have no ideas about this stuff. On Oct 27, 3:06 am, d...@axiom-developer.org wrote: I see that my Literate Programming session is beginning to gain some traction. I would encourage you to bring examples. We can discuss the merits and possibly gain some new insights. If nothing else, please sign up for the Literate Software session at Clojure-Conj. I promise to keep it short. Literate programming can take various forms. I am working on a survey of literate software. I came across an interesting non-latex example worth sharing: http://jashkenas.github.com/coffee-script/documentation/docs/nodes.html Notice how well they have documented an apparently simple line as in: exports.Base = class Base The Base is an abstract base class for all nodes in the syntax tree. Each subclass implements the compileNode method, which performs the code generation for that node. To compile a node to JavaScript, call compile on it, which wraps compileNode in some generic extra smarts, to know when the generated code needs to be wrapping up in a closure. An options hash is passed and cloned throughout, containing information about the environment from higher in the tree (such as if a returned value is being requested by the surrounding function), information about the current scope, and indentation level. Notice how this is not only giving trivial information (e.g. Base is an abstract base class) but WHY it exists (..as a base for all nodes in the syntax tree). It gives operational information (to compile a node..) as well as information about the effect (..which wraps...). It shows how global information is used (An options hash..) and WHY (containing information about the environment...) Code only tells you HOW something is done at the time it is done. It's like having a recipe without an idea what you would make. If our standards of documentation were raised to this level then large systems like Axiom, Clojure, and ClojureScript would be much easier to maintain and modify in the long term. If you want your code to live beyond you, make it literate. Tim Daly d...@literatesoftware.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 Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: ANN: clojure.java.jdbc 0.0.7
will the 1.0.0 be included in core or contrib package?
On Oct 12, 5:37 am, Sean Corfield seancorfi...@gmail.com wrote:
Changes in 0.0.7:
* Fix JDBC-9 by renaming duplicate columns instead of throwing an exception.
- thanx to Peter Siewert!
* Fix JDBC-16 by ensuring do-prepared works with no param-groups provided.
* Fix JDBC-17 by adding type hints to remove more reflection warnings.
- thanx to Stuart Sierra!
Documentation:
* Address JDBC-4 by documenting how to do connection pooling.
Plans:
Once JDBC-3 / JDBC-15 have been addressed (use of deprecated
struct-map stuff), I'll declare 0.1.0 and ask Clojure/core what would
be needed for a 1.0.0 release. Feel free to provide feedback for
future development here:
http://dev.clojure.org/display/design/java.jdbc
Earlier changes...
Changes in 0.0.6:
* Move former tests to test-utilities namespace - these do not touch a
database
* Convert old test examples into real tests against real databases
- tested locally against MySQL, Apache Derby, HSQLDB
- build system should run against Apache Derby, HSQLSB
- will add additional databases later
* Fix JDBC-12 by removing batch when doing a single update
* Remove wrapping of exceptions in transactions to make it easier to
work with SQLExceptions
Changes in 0.0.5:
* Add prepare-statement function to ease creation of PreparedStatement
with common options:
- see docstring for details
* with-query-results now allows the SQL/params vector to be:
- a PreparedStatement object, followed by any parameters the SQL needs
- a SQL query string, followed by any parameters it needs
- options (for prepareStatement), a SQL query string, followed by
any parameters it needs
* Add support for databases that cannot return generated keys (e.g., HSQLDB)
- insert operations silently return the insert counts instead of
generated keys
- it is the user's responsibility to handle this if you're using
such a database!
Changes in 0.0.4:
* Fix JDBC-2 by allowing :table-spec {string} at the end of
create-table arguments:
(sql/create-table :foo [:col1 int] [col2 :int] :table-spec
ENGINE=MyISAM)
* Fix JDBC-8 by removing all reflection warnings
* Fix JDBC-11 by no longer committing the transaction when an Error occurs
* Clean up as-... functions to reduce use of (binding)
* Refactor do-prepared*, separating out return keys logic and
parameter setting logic
- in preparation for exposing more hooks in PreparedStatement
creation / manipulation
Changes in 0.0.3:
* Fix JDBC-10 by using .executeUpdate when generating keys (MS SQL
Server, PostgreSQL compatibility issue)
Changes in 0.0.2:
* Fix JDBC-7 Clojure 1.2 compatibility (thanx to Aaron Bedra!)
Changes in 0.0.1 (compared to clojure.contrib.sql):
* Exposed print-... functions for exception printing; no longer writes
exceptions to *out*
* Add clojure.java.jdbc/resultset-seq (to replace
clojure.core/resultset-seq which should be deprecated)
* Add support for naming and quoting strategies -
seehttp://clojure.github.com/java.jdbc/doc/clojure/java/jdbc/NameMapping...
- The formatting is a bit borked, Tom F knows about this and is
working on an enhancement to auto-doc to improve it
* Add ability to return generated keys from single insert operations,
add insert-record function
* Clojure 1.3 compatibility
--
Sean A Corfield -- (904) 302-SEAN
An Architect's View --http://corfield.org/
World Singles, LLC. --http://worldsingles.com/
Railo Technologies, Inc. --http://www.getrailo.com/
Perfection is the enemy of the good.
-- Gustave Flaubert, French realist novelist (1821-1880)
--
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
where can I find the official statement about changes from 1.2 to 1.3?
When I tried to answer a question (from other people) about why in 1.3 we need to explicitly declare ^:dynamic for a Var, I found I cannot find an official document about this change from 1.2 (or older version) to 1.3. I went to github (https://github.com/clojure/clojure/ blob/master/changes.md) but only found description like 1.1 Earmuffed Vars are No Longer Automatically Considered Dynamic -- at first glance I thought that the explicit declaration thing is only for earmuffed Vars but when I tried it in a 1.3 REPL, I found we need to explicitly declare all Vars to ^:dynamic if we want a rebinding. Where can I find the official statement about this change (or other similar changes)? -- 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: Oxjure - Oxford Clojure Group
Got it. :-) On Oct 9, 11:00 am, jaime xiejianm...@gmail.com wrote: Why not use this group directly?? I personally think separating people in different groups will disperse people's attention only.what is the benefit? On Oct 8, 7:49 pm, Folcon fol...@gmail.com wrote: Hi Everyone, I'm interested in seeing if there are enough people in Oxford, United Kingdom to start an Oxford Clojure group. I'm willing to run the group in my spare time, but it would be useful to see if there are people here who would be interested in joining. I don't know if this is the right place to make such an announcement, but I think I need to start somewhere ;). I've visited the Cambridge Clojure group in the past and they are definitely a great bunch of people, but I've found it quite hard to find the time to regularly go. I've yet to visit the London group and hope to have the opportunity to do so in the future. So I think there is a need for Oxford to have it's own group. Please chime in with thoughts and ideas. I was thinking of setting up a meeting in the next week or two. Folcon -- 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: Oxjure - Oxford Clojure Group
Why not use this group directly?? I personally think separating people in different groups will disperse people's attention only.what is the benefit? On Oct 8, 7:49 pm, Folcon fol...@gmail.com wrote: Hi Everyone, I'm interested in seeing if there are enough people in Oxford, United Kingdom to start an Oxford Clojure group. I'm willing to run the group in my spare time, but it would be useful to see if there are people here who would be interested in joining. I don't know if this is the right place to make such an announcement, but I think I need to start somewhere ;). I've visited the Cambridge Clojure group in the past and they are definitely a great bunch of people, but I've found it quite hard to find the time to regularly go. I've yet to visit the London group and hope to have the opportunity to do so in the future. So I think there is a need for Oxford to have it's own group. Please chime in with thoughts and ideas. I was thinking of setting up a meeting in the next week or two. Folcon -- 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
implement a shell in repl
Hi guys, I want to implement a shell on top of REPL but without any ideas on how to do it. Could you please suggest? What I want is something that can let user do things like: 1. in REPL, user enter (myshell) (or some other command name) 2. then a prompt string will show up so that user can interact with Clojure 3. built-in commands support is possible 4. prompt for user input is possible (I think this is the most import part that I want, but I don't know how I can make REPL prompts a user input...) 5. real Clojure form can be dispatch to REPL and the shell can show the result returned by REPL is there any project already on this, or is it possible to implement it in some kind of ways?? Thanks, Jaime -- 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 attach debugger on clojure's repl ?
I'm also looking forward the same thing.. On Sep 20, 12:24 am, cran1988 rmanolis1...@hotmail.com wrote: I am looking forward for a debugger like in CLISP , SBCL etc.. Is there any solution out there ? Are you going to develop such a tool and you need help ? -- 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: implement a shell in repl
Good point. I think I need to find out how to make the shell prompt for user input, e.g. when the user log into a system, the shell will prompt to ask for a password On Sep 20, 4:03 pm, Sanel Zukan san...@gmail.com wrote: I had quite similar task, integrating custom shell with clojure repl, where all expressions between parenthesis were interpreted as clojure code and rest as custom shell programs. The best way to do this is to explore (clojure.main/repl) function. One of the parameters will be :eval function; there clojure repl will send all expressions for evaluation. It could look like this: (defn evaluate [expr] (if (re-find #^(.*)$ expr) (eval expr) ;; here you call some java code for executing system commands ;; like (.exec (Runtime/getRuntime) expr) or something like that ) ) (clojure.main/repl :eval evaluate) With clojure.main/repl you can do even more: write custom input, output and such. Feel free to explore it ;) Sanel On Sep 20, 9:38 am, jaime xiejianm...@gmail.com wrote: Hi guys, I want to implement a shell on top of REPL but without any ideas on how to do it. Could you please suggest? What I want is something that can let user do things like: 1. in REPL, user enter (myshell) (or some other command name) 2. then a prompt string will show up so that user can interact with Clojure 3. built-in commands support is possible 4. prompt for user input is possible (I think this is the most import part that I want, but I don't know how I can make REPL prompts a user input...) 5. real Clojure form can be dispatch to REPL and the shell can show the result returned by REPL is there any project already on this, or is it possible to implement it in some kind of ways?? Thanks, Jaime -- 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: implement a shell in repl
This may not work the way I want...but yes I will give it a shot. :-) On Sep 21, 2:08 am, Ken Wesson kwess...@gmail.com wrote: Wouldn't the simplest way be to simply use the REPL itself as the shell, with a few things defined like this? (def dir (atom (System/getProperty user.home))) (defn pwd [] @dir) (defn cd [dir] (reset! @dir dir)) (defn ... ) -- 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: clojure.java.jdbc input on JDBC-3 (esp. Stuart Sierra!)
Not related to this topic, but just wonder if it's possible to have c.j.j to support Unicode? And if it's already there, how can I use it for Unicode? On Aug 17, 2:17 am, Sean Corfield seancorfi...@gmail.com wrote: On Tue, Aug 16, 2011 at 11:02 AM, Stuart Sierra the.stuart.sie...@gmail.com wrote: I no longer remember what I was looking at when I wrote that ticket. :) Maybe I just wasn't aware of `insert-records`. Cool. Any thoughts on the struct-map issue? resultset-seq currently uses a deprecated feature - it should just use regular maps, right? I'm not familiar enough with struct-maps to understand the full implications of switching that out... -- Sean A Corfield -- (904) 302-SEAN An Architect's View --http://corfield.org/ World Singles, LLC. --http://worldsingles.com/ Railo Technologies, Inc. --http://www.getrailo.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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: is my understanding correct for function identity?
Hey guys, the clojuredocs link seems interesting and a good place for studying/referencing Clojure. :-) On Aug 15, 12:11 am, abp abp...@googlemail.com wrote: I wanted to add the map/cycle sample, then thougt of clojuredocs and here you go: http://clojuredocs.org/clojure_core/clojure.core/identity On 14 Aug., 00:25, Alan Malloy a...@malloys.org wrote: On Aug 13, 12:45 pm, jaime xiejianm...@gmail.com wrote: I found an interesting function identity which will do nothing but only returns the parameter passed to it. The next minute I came up a question: then what's the purpose of this function? -- I've tried to figure out reasons of existence of identity. The only reason that I can imagine is this: because we often use higher-order functions, these higher-order functions will accept functions as its parameters, in such a situation, when we want to use a higher-order function but don't want to pass any real functions to it, then we can use function like identity and identity here is just to fill the role of parameter of higher-order function. Guys, is my guess correct or not? Are there other reasons for identity's existence?? Are there other functions for the same purpose? One of my favorite uses of identity is for use with partition-by: user (partition-by identity '(a a b a a a a c c d)) ;; ((a a) (b) (a a a a) (c c) (d)) I sometimes speculate that, while identity is plenty useful, if your program contains the characters (identity, you probably don't know how to program. -- 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: is my understanding correct for function identity?
It's great to hear so many useful responses/tips -- it's really helpful for people who is leaning Clojure, especially for a beginner like me. Thank you all! -:) On Aug 14, 12:45 am, jaime xiejianm...@gmail.com wrote: I found an interesting function identity which will do nothing but only returns the parameter passed to it. The next minute I came up a question: then what's the purpose of this function? -- I've tried to figure out reasons of existence of identity. The only reason that I can imagine is this: because we often use higher-order functions, these higher-order functions will accept functions as its parameters, in such a situation, when we want to use a higher-order function but don't want to pass any real functions to it, then we can use function like identity and identity here is just to fill the role of parameter of higher-order function. Guys, is my guess correct or not? Are there other reasons for identity's existence?? Are there other functions for the same purpose? Thanks, Jaime -- 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
is my understanding correct for function identity?
I found an interesting function identity which will do nothing but only returns the parameter passed to it. The next minute I came up a question: then what's the purpose of this function? -- I've tried to figure out reasons of existence of identity. The only reason that I can imagine is this: because we often use higher-order functions, these higher-order functions will accept functions as its parameters, in such a situation, when we want to use a higher-order function but don't want to pass any real functions to it, then we can use function like identity and identity here is just to fill the role of parameter of higher-order function. Guys, is my guess correct or not? Are there other reasons for identity's existence?? Are there other functions for the same purpose? Thanks, Jaime -- 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: Optimizing JDBC code
Hi guys, I just want to learn using databases in Clojure, can you suggest where to start? by looking at source code of clojure.java.jdbc/ clojure.contrib.sql or there's some tutorial/document that I can start with? Thanks, Jaime On Aug 7, 1:51 pm, Shoeb Bhinderwala shoeb.bhinderw...@gmail.com wrote: I switched to clojure.java.jdbc. Found no difference at all. It is still about 10 times slower than java. On Aug 6, 8:54 pm, Sean Corfield seancorfi...@gmail.com wrote: On Sat, Aug 6, 2011 at 4:51 PM, Shoeb Bhinderwala shoeb.bhinderw...@gmail.com wrote: In one test case, I loaded 69,099 records. The Java code took 5 seconds to execute the query and create as many objects. Clojure code took 50.43 seconds. Try using clojure.java.jdbc instead of clojure.contrib.sql. c.j.j is the maintained version of c.c.sql and has had a number of enhancements such as removing all the Java reflection that was being done. -- Sean A Corfield -- (904) 302-SEAN An Architect's View --http://corfield.org/ World Singles, LLC. --http://worldsingles.com/ Railo Technologies, Inc. --http://www.getrailo.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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: Announcement: stockings clojure library for easy access to financial data
I tried to run the example behind a proxy but the connection failed. Anyone who knows how to resolve this?? I'm using Eclipse and plugin counterclockwise, the Eclipse itself can check for update behind the proxy. Thanks, Jaime On Jun 1, 3:09 am, fxt f...@fxtlabs.com wrote: Hi everyone, I just wanted to announce release 1.0 of my latest project: stockings.https://github.com/fxtlabs/stockingshttp://stockings.fxtlabs.comhttp://clojars.org/com.fxtlabs/stockings I mentioned some of this work to some of you at the last Bonjure (Montreal Clojure User Group) meeting, so I thought someone might be interested. Stockings is a Clojure library that gives you easy access to financial data such as current and historicalstockquotes, current currency exchange rates,stocksymbol suggestions,stockand company info by trading exchanges and industry sectors, and more. It integrates information from different web services in a consistent way, doing all the error handling, JSON, XML, and CSV parsing, and all the other quirky data massaging for you. I hope some of you will find it useful. Any feedback is welcome. Thank you, fxt -- 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: interest in STM, where can I start to get knowing well about it?
Tom, I had a fast view on the first several slides (slides about your MC- STM implementation version 1), and found it concise and precise and could be a good resource for demonstration/comprehension on basic STM concepts/mechanism. Great job! I will definitely come back to this useful slide when I have more time :-) Thanks, Jaime On May 24, 12:50 am, Tom Van Cutsem tomvc...@gmail.com wrote: If you are more interested in the semantics of STM (such as how is commute different from alter?), rather than in the actual Java implementation, I wrote a little meta-circular STM system in Clojure that could be helpful: https://github.com/tvcutsem/stm-in-clojure Kind regards, Tom 2011/5/19 MohanR radhakrishnan.mo...@gmail.com So I think readng the actual STM source with Java' features might help. Are there actually books on this topic ? Peter Van roy's Data flow concurrency book ? Thanks, Mohan -- 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: interest in STM, where can I start to get knowing well about it?
huh, I do not know this topic well, any good resource for this?? On May 19, 3:59 pm, MohanR radhakrishnan.mo...@gmail.com wrote: So I think readng the actual STM source with Java' features might help. Are there actually books on this topic ? Peter Van roy's Data flow concurrency book ? Thanks, Mohan -- 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
interest in STM, where can I start to get knowing well about it?
Hi All, I have interest in the implementation of STM, anyone who can suggest where I can start to find out how it was implemented? I can probably go read the source code but I'm just a fresher of Clojure and also need some guides/materials about the internal mechanism, I guess it likes kind of database implementation (locks latches), but I'm not familiar with that field either. BTW, I got a Java background and know a little about LISP. Thanks! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: interest in STM, where can I start to get knowing well about it?
Thank you Michael, the link you gave is what I want! On May 18, 8:15 pm, Michael Wood esiot...@gmail.com wrote: On 18 May 2011 09:25, jaime xiejianm...@gmail.com wrote: Hi All, I have interest in the implementation of STM, anyone who can suggest where I can start to find out how it was implemented? This might be a good place to start: http://java.ociweb.com/mark/stm/ I can probably go read the source code but I'm just a fresher of Clojure and also need some guides/materials about the internal mechanism, I guess it likes kind of database implementation (locks latches), but I'm not familiar with that field either. BTW, I got a Java background and know a little about LISP. Thanks! -- Michael Wood esiot...@gmail.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 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: interest in STM, where can I start to get knowing well about it?
Yes I think I also need to read the source code. Thanks~ On May 18, 8:49 pm, Stefan Kamphausen ska2...@googlemail.com wrote: Hi, I don't think, there is any way around reading LockingTransaction.java in the source-code of Clojure. But it's just around 500 LoC, so it's not too bad. Regards, Stefan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
