jscheme-user — list for general users

Re: [Jscheme-user] definitions available at compile time?

[jeffbz <je...@co...>]

Thanks for the reply.
The code is written as intended. And indeed, this problem is confined to the
compiler; in the REPL everything is fine. I'll try moving some definitions
to another file to see if (load ...) helps. In general this wouldn't help
too much though, since I'd like to be able to run an arbitrary portion of my
code during macroexpansion.

-Jeff


Kyle R. Burton wrote:
> 
>> I'm getting an error that seems to indicate the compiler can't see my
>> toplevel function definitions during macroexpansion. I have a function
>> foo,
>> and a macro M that uses it. I get an error compiling function bar, which
>> uses M, saying undefined variable "foo". How can I make my definitions
>> visible during compilation?
>> Example code that exhibits this issue:
>> (define (foo x) (+ 1 x))
>> (define-macro (M y) (foo y))
>> (define (bar z) (M 3))
>>
>> output:
>> first pass of compiler
>> (compiling  foo)
>> (compiling  bar)
>> (Error while compiling  SchemeException: ERROR: undefined variable "foo")
>> SchemeException: ERROR: undefined variable "foo"
>>         at jsint.E.error(E.java:14)
>>
>> thank you, and thank you for JScheme, which I am greatly enjoying!!
> 
> Do you want foo to be part of the expansoin?  In other words, do you
> want M to expand to the call to foo, or do you want it to be 'compiled
> away'?
> 
> eg, do you want bar to be equivalent to:
> 
>  (define (bar z) (foo 3))
> 
> Or do you want it to be
> 
>  (define (bar z) 4)
> 
> ?
> 
> If it is the former, then M should probably look like:
> 
>   (define-macro (M y) `(foo ,y))
> 
> Either way, when I type in your expressions, I receive no error with
> jscheme 7.2:
> 
> $ java -jar jscheme-7.2.jar
> JScheme 7.2 (2/2/06 9:47 PM) http://jscheme.sourceforge.net
>> (define (foo x) (+ 1 x))
> $1 = (lambda foo (x)...)
>> (foo 3)
> $2 = 4
>> (define-macro (M y) (foo y))
> $3 = (macro M (y)...)
>> (define (bar z) (M 3))
> $4 = (lambda bar (z)...)
>> (bar 1)
> $5 = 4
>> (bar 2)
> $6 = 4
>>
> 
> If you're after constant math (making bar be the integer 4), actually
> regardless, it looks like if you put the macro definition in a
> separate file and load it, it succeeds:
> 
> $ cat mac.scm
> (define-macro (M y) (foo y))
> 
> kburton@lap0029 ~/projects/sandbox/jscheme
> $ cat Foo.scm
> (load "mac.scm")
> (define (foo x) (+ 1 x))
> (define (bar z) (M 3))
> 
> (define (main args)
>   (write "bar ") (write (bar 10)) (newline))
> 
> I'm not very familiar with the compiler...I hope this helps.
> 
> Regards,
> 
> Kyle Burton
> 

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Re: [Jscheme-user] definitions available at compile time?

[Kyle R. B. <kyl...@gm...>]

> I'm getting an error that seems to indicate the compiler can't see my
> toplevel function definitions during macroexpansion. I have a function foo,
> and a macro M that uses it. I get an error compiling function bar, which
> uses M, saying undefined variable "foo". How can I make my definitions
> visible during compilation?
> Example code that exhibits this issue:
> (define (foo x) (+ 1 x))
> (define-macro (M y) (foo y))
> (define (bar z) (M 3))
>
> output:
> first pass of compiler
> (compiling  foo)
> (compiling  bar)
> (Error while compiling  SchemeException: ERROR: undefined variable "foo")
> SchemeException: ERROR: undefined variable "foo"
>         at jsint.E.error(E.java:14)
>
> thank you, and thank you for JScheme, which I am greatly enjoying!!

Do you want foo to be part of the expansoin?  In other words, do you
want M to expand to the call to foo, or do you want it to be 'compiled
away'?

eg, do you want bar to be equivalent to:

 (define (bar z) (foo 3))

Or do you want it to be

 (define (bar z) 4)

?

If it is the former, then M should probably look like:

  (define-macro (M y) `(foo ,y))

Either way, when I type in your expressions, I receive no error with
jscheme 7.2:

$ java -jar jscheme-7.2.jar
JScheme 7.2 (2/2/06 9:47 PM) http://jscheme.sourceforge.net
> (define (foo x) (+ 1 x))
$1 = (lambda foo (x)...)
> (foo 3)
$2 = 4
> (define-macro (M y) (foo y))
$3 = (macro M (y)...)
> (define (bar z) (M 3))
$4 = (lambda bar (z)...)
> (bar 1)
$5 = 4
> (bar 2)
$6 = 4
>

If you're after constant math (making bar be the integer 4), actually
regardless, it looks like if you put the macro definition in a
separate file and load it, it succeeds:

$ cat mac.scm
(define-macro (M y) (foo y))

kburton@lap0029 ~/projects/sandbox/jscheme
$ cat Foo.scm
(load "mac.scm")
(define (foo x) (+ 1 x))
(define (bar z) (M 3))

(define (main args)
  (write "bar ") (write (bar 10)) (newline))

I'm not very familiar with the compiler...I hope this helps.

Regards,

Kyle Burton

[Jscheme-user] definitions available at compile time?

[jeffbz <je...@co...>]

Hi,

I'm getting an error that seems to indicate the compiler can't see my
toplevel function definitions during macroexpansion. I have a function foo,
and a macro M that uses it. I get an error compiling function bar, which
uses M, saying undefined variable "foo". How can I make my definitions
visible during compilation?
Example code that exhibits this issue:
(define (foo x) (+ 1 x))
(define-macro (M y) (foo y))
(define (bar z) (M 3))

output:
first pass of compiler
(compiling  foo)
(compiling  bar)
(Error while compiling  SchemeException: ERROR: undefined variable "foo")
SchemeException: ERROR: undefined variable "foo"
        at jsint.E.error(E.java:14)

thank you, and thank you for JScheme, which I am greatly enjoying!!

-Jeff

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[Jscheme-user] [Scheme Steering Committee announcements] R6RS Released

[Mitchell W. <wa...@cc...>]

On behalf of the Steering Committee and the Editors Committee, I am
extremely pleased to announce that the R6RS is now available in pdf
format at http://www.r6rs.org .

An HTML version will be available shortly.

The editors have asked me to include the following statement.

 The editors would like to make the following suggestion to the steering
 committee and, by extension, the Scheme community.

 Among the differences between the R6RS and its predecessors, the sheer
 size of the report is the most obvious.  This difference can be explained
 by the primary goal that drove the R6RS effort, which was to enable a new
 level of portability among Scheme implementations.  Given that goal, many
 language constructs that implementations supply out of practical
 necessity---including modules, records, expressive macro systems, byte
 vectors, hash tables, and exceptions---fell under the purview of the new
 report, instead of individual implementations.  The result is a
 significantly larger report.

 The expanded scope and size of the report make its compromises and flaws
 more keenly felt than before; quite simply, there are more details to get
 wrong.  Compromises and flaws are inherent in a standardization process,
 just as they are inherent in the production of software artifacts (at
 least given our current technology).  As with software, the clearest way
 forward is a process of continual refinement.

 We therefore suggest that the standardization process be refined to
 accommodate a series of incremental reports (R6.1RS, R6.2RS, etc.) to
 address problems in R6RS as flaws and their solutions become clear.

On behalf of the Steering Committee, I would like to thank all the
editors for their efforts over the last four years.  The scale and
length of this process is unprecedented in our community.  I would
also to like to thank the many people who contributed to the discussion
and participated in the R6RS process.

I will be giving a report on the process at the Scheme Workshop on
Sunday.  I look forward to seeing many of you there.

Sincerely,
--Mitch Wand

for the Steering Committee:
Alan Bawden
Guy Steele
Mitch Wand

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Re: [Jscheme-user] Build error: version.txt missing?

[Frank Hu <fra...@gm...>]

Checked out the source from CVS.  Everything works fine.

Thanks, Geoffrey and Tim.
Frank

On Sep 13, 2007, at 8:15 AM, Timothy J Hickey wrote:

> Nice work Geooffrey!!
>
> I've committed your changes into CVS.
> There was also another problem with the code base
> (which has been corrected in CVS) --
>
> You need to delete the 18th line of src/jsint/primitives.scm
>            (tail 1)           "return U.tail((Pair)x);"
> With these two changes everything is compiling nicely for me on
> Mac OS X 10.4  using java 1.5.0_07-87
>
> I haven't tried it on Windows yet. I'll have to wait until tomorrow
> when I have access to a Windows machine.
>
> Happy Rosh Hashanah,
> ---Tim---
>
>
> On Sep 13, 2007, at 6:28 AM, Geoffrey S. Knauth wrote:
>
>> On Sep 11, 2007, at 23:47, Frank Hu wrote:
>>> I'm trying to build version 7.2 on a Mac OS X 10.4.10 system.  Got
>>> the following error message when doing "sh bin/make"
>>> [...]
>>> SchemeException: java.io.FileNotFoundException: path_to_jscheme-7.2/
>>> src:/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/
>>> Classes/.compatibility/src/jsint/version.txt (No such file or
>>> directory)
>>
>> I found a way to build JScheme on Mac OS X 10.4.10.
>> I believe this fix should be valid for all platforms.
>>
>> Geoffrey
>>
>> In src/build/make.scm, I replaced:
>>
>> --->8---snip--->8---
>> ;;; Assumes a subdirectory is the only thing on classpath.
>> (define appDir (.getCanonicalFile
>> 		(.getParentFile
>>                    (.getCanonicalFile
>> 		   (File. ($ "java.class.path"))))))
>> --->8---snip--->8---
>>
>> with:
>>
>> --->8---snip--->8---
>> ;;; No longer assumes a subdirectory is the only thing on classpath.
>> ;;; Now assumes first thing on classpath is what should be used.
>> (define appDir
>>    (let* ((cp ($ "java.class.path"))
>>           (i (.indexOf cp (System.getProperty "path.separator")))
>>           (subdir (cond ((= i -1) cp)
>>                         ((> i 0) (substring cp 0 i))
>>                         (else (error (string-append
>>                                       "appDir: can't create File
>> object "
>>                                       "from classpath "
>>                                       "\"" cp "\"\n"))))))
>>      (.getCanonicalFile (.getParentFile (.getCanonicalFile (File.
>> subdir))))))
>>
>> --->8---snip--->8---
>>
>>
>> --------------------------------------------------------------------- 
>> ----
>> This SF.net email is sponsored by: Microsoft
>> Defy all challenges. Microsoft(R) Visual Studio 2005.
>> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
>> _______________________________________________
>> Jscheme-user mailing list
>> Jsc...@li...
>> https://lists.sourceforge.net/lists/listinfo/jscheme-user
>

Re: [Jscheme-user] Build error: version.txt missing?

[Timothy J H. <tjh...@br...>]

Nice work Geooffrey!!

I've committed your changes into CVS.
There was also another problem with the code base
(which has been corrected in CVS) --

You need to delete the 18th line of src/jsint/primitives.scm
            (tail 1)           "return U.tail((Pair)x);"
With these two changes everything is compiling nicely for me on
Mac OS X 10.4  using java 1.5.0_07-87

I haven't tried it on Windows yet. I'll have to wait until tomorrow
when I have access to a Windows machine.

Happy Rosh Hashanah,
---Tim---


On Sep 13, 2007, at 6:28 AM, Geoffrey S. Knauth wrote:

> On Sep 11, 2007, at 23:47, Frank Hu wrote:
>> I'm trying to build version 7.2 on a Mac OS X 10.4.10 system.  Got
>> the following error message when doing "sh bin/make"
>> [...]
>> SchemeException: java.io.FileNotFoundException: path_to_jscheme-7.2/
>> src:/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/
>> Classes/.compatibility/src/jsint/version.txt (No such file or
>> directory)
>
> I found a way to build JScheme on Mac OS X 10.4.10.
> I believe this fix should be valid for all platforms.
>
> Geoffrey
>
> In src/build/make.scm, I replaced:
>
> --->8---snip--->8---
> ;;; Assumes a subdirectory is the only thing on classpath.
> (define appDir (.getCanonicalFile
> 		(.getParentFile
>                    (.getCanonicalFile
> 		   (File. ($ "java.class.path"))))))
> --->8---snip--->8---
>
> with:
>
> --->8---snip--->8---
> ;;; No longer assumes a subdirectory is the only thing on classpath.
> ;;; Now assumes first thing on classpath is what should be used.
> (define appDir
>    (let* ((cp ($ "java.class.path"))
>           (i (.indexOf cp (System.getProperty "path.separator")))
>           (subdir (cond ((= i -1) cp)
>                         ((> i 0) (substring cp 0 i))
>                         (else (error (string-append
>                                       "appDir: can't create File
> object "
>                                       "from classpath "
>                                       "\"" cp "\"\n"))))))
>      (.getCanonicalFile (.getParentFile (.getCanonicalFile (File.
> subdir))))))
>
> --->8---snip--->8---
>
>
> ---------------------------------------------------------------------- 
> ---
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2005.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Jscheme-user mailing list
> Jsc...@li...
> https://lists.sourceforge.net/lists/listinfo/jscheme-user

Re: [Jscheme-user] Build error: version.txt missing?

[Geoffrey S. K. <ge...@kn...>]

On Sep 11, 2007, at 23:47, Frank Hu wrote:
> I'm trying to build version 7.2 on a Mac OS X 10.4.10 system.  Got
> the following error message when doing "sh bin/make"
> [...]
> SchemeException: java.io.FileNotFoundException: path_to_jscheme-7.2/
> src:/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/
> Classes/.compatibility/src/jsint/version.txt (No such file or  
> directory)

I found a way to build JScheme on Mac OS X 10.4.10.
I believe this fix should be valid for all platforms.

Geoffrey

In src/build/make.scm, I replaced:

--->8---snip--->8---
;;; Assumes a subdirectory is the only thing on classpath.
(define appDir (.getCanonicalFile
		(.getParentFile
                   (.getCanonicalFile
		   (File. ($ "java.class.path"))))))
--->8---snip--->8---

with:

--->8---snip--->8---
;;; No longer assumes a subdirectory is the only thing on classpath.
;;; Now assumes first thing on classpath is what should be used.
(define appDir
   (let* ((cp ($ "java.class.path"))
          (i (.indexOf cp (System.getProperty "path.separator")))
          (subdir (cond ((= i -1) cp)
                        ((> i 0) (substring cp 0 i))
                        (else (error (string-append
                                      "appDir: can't create File  
object "
                                      "from classpath "
                                      "\"" cp "\"\n"))))))
     (.getCanonicalFile (.getParentFile (.getCanonicalFile (File.  
subdir))))))

--->8---snip--->8---

Re: [Jscheme-user] Build error: version.txt missing?

[Geoffrey S. K. <ge...@kn...>]

I added the following as the first sexp in src/build/make.scm:

(display (src ""))

to see just what JScheme thought the source path was, and it displayed:

/Users/gknauth/test/jscheme/t-fresh/jscheme-7.2/src:/System/Library/ 
Frameworks/JavaVM.framework/Versions/1.5.0/Classes/.compatibility/src

(That was all one one line, in case mail chopped it up.)

I believe it was supposed to display just:

/Users/gknauth/test/jscheme/t-fresh/jscheme-7.2/src

In other words, the build process is trying to make the path to a  
filename, but the path contains more than one path element, so the  
filesystem errors back to Java, which reports back "No such file or  
directory."  It's the path it's complaining about, not a missing  
version.txt file.  version.txt is created by the (make-version)  
function call.

There's a potential clue in the comment just before the definition of  
appDir in make.scm:

;;; Assumes a subdirectory is the only thing on classpath.
(define appDir (.getCanonicalFile
		(.getParentFile
                   (.getCanonicalFile
		   (File. ($ "java.class.path"))))))
(define srcDir (File. appDir "src"))
(define (src name) (File. srcDir name))

It seems to me appDir needs to be fixed, because it is used in 20  
places in make.scm to build subdirectory paths.

Re: [Jscheme-user] Build error: version.txt missing?

[Geoffrey S. K. <ge...@kn...>]

Frank,

I tried a fresh checkout and build on my Mac OS X 10.4.10 system and  
got exactly the same result as  you, but there were two additional  
lines of error message at the very top:

Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

That may be inconsequential.  I'm going to retry compilation using  
"sh -x bin/make" instead of "sh bin/make" to get more detail.

Geoffrey

On Sep 11, 2007, at 23:47, Frank Hu wrote:


> Hi,
>
> I'm trying to build version 7.2 on a Mac OS X 10.4.10 system.  Got
> the following error message when doing "sh bin/make"
>
> -all
> -clean
> -javac
> (call-with-output-file
>    (src '"jsint/version.txt")
>    (lambda (s)
>      (display
>        (let ((d (.format
>                   (DateFormat.getDateTimeInstance
>                     DateFormat.SHORT$
>                     DateFormat.SHORT$)
>                   (Date.))))
>          (!{} '"JScheme 7.2 ("
>               d
>               '") http://jscheme.sourceforge.net
> "))
>        s)))
>
>
>    ====================================
> SchemeException: java.io.FileNotFoundException: path_to_jscheme-7.2/
> src:/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/
> Classes/.compatibility/src/jsint/version.txt (No such file or  
> directory)
>
> It seems that version.txt is missing.  A quick look at the java
> source code doesn't indicate that this file is generated.
>
> Frank

Re: [Jscheme-user] Build error: version.txt missing?

[Geoffrey S. K. <ge...@kn...>]

Just thinking out loud here...  It seems to me that "src/version.txt"  
is generated.  It exists on my system, it is just one line, and it  
looks like this:

JScheme 7.2 (4/27/05 4:57 AM) http://jscheme.sourceforge.net

What puzzles me is what's in the SchemeException output you provided,  
everything from "path_to_jscheme-7.2/" to and including  
"Classes/.compatibility/".

I'll try a fresh checkout and build on my Mac OS X system and see  
what happens.  My hunch is something's in your environment that the  
build process isn't expecting.

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk


On Sep 11, 2007, at 23:47, Frank Hu wrote:


> Hi,
>
> I'm trying to build version 7.2 on a Mac OS X 10.4.10 system.  Got
> the following error message when doing "sh bin/make"
>
> -all
> -clean
> -javac
> (call-with-output-file
>    (src '"jsint/version.txt")
>    (lambda (s)
>      (display
>        (let ((d (.format
>                   (DateFormat.getDateTimeInstance
>                     DateFormat.SHORT$
>                     DateFormat.SHORT$)
>                   (Date.))))
>          (!{} '"JScheme 7.2 ("
>               d
>               '") http://jscheme.sourceforge.net
> "))
>        s)))
>
>
>    ====================================
> SchemeException: java.io.FileNotFoundException: path_to_jscheme-7.2/
> src:/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/
> Classes/.compatibility/src/jsint/version.txt (No such file or  
> directory)
>
> It seems that version.txt is missing.  A quick look at the java
> source code doesn't indicate that this file is generated.
>
> Frank
>

[Jscheme-user] Build error: version.txt missing?

[Frank Hu <fra...@gm...>]

Hi,

I'm trying to build version 7.2 on a Mac OS X 10.4.10 system.  Got  
the following error message when doing "sh bin/make"

-all
-clean
-javac
(call-with-output-file
   (src '"jsint/version.txt")
   (lambda (s)
     (display
       (let ((d (.format
                  (DateFormat.getDateTimeInstance
                    DateFormat.SHORT$
                    DateFormat.SHORT$)
                  (Date.))))
         (!{} '"JScheme 7.2 ("
              d
              '") http://jscheme.sourceforge.net
"))
       s)))


   ====================================
SchemeException: java.io.FileNotFoundException: path_to_jscheme-7.2/ 
src:/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/ 
Classes/.compatibility/src/jsint/version.txt (No such file or directory)

It seems that version.txt is missing.  A quick look at the java  
source code doesn't indicate that this file is generated.

Frank

[Jscheme-user] [Scheme Steering Committee announcements] R6RS Ratified

[Mitchell W. <wa...@cc...>]

According to the Scheme Charter, at the end of the review process, the
Steering Committee could choose either to finalize the submitted draft
or to restart the review process. In order to be sure that the new
revised Scheme standard enjoyed wide support among the Scheme
community, the Steering Committee adopted a procedure in which there
would be a vote on the question of whether the draft should be
ratified, and they agreed to be bound by the results of that vote.

112 people registered to vote on the question. 102 of those electors
cast their ballots before the poll closed on 12 August 2007. 67
electors voted to ratify draft 5.97 as R6RS. 35 electors were opposed
to ratification. Thus 65.7% of those who voted, voted in favor of
ratification. This is more than the 60% required for ratification.

The Steering Committee therefore ratifies the draft numbered 5.97 as
the official "Revised6 Report on the Algorithmic Language Scheme". The
Editors are directed to prepare the final text of the document,
correcting only minor errata.

The final record of the ratification vote can be found at
http://www.r6rs.org/ratification/results.html. (Additional
correspondence received after the poll closed will be published
separately.)


---The Scheme Language Steering Committee:
    Alan Bawden
    Guy Steele
    Mitch Wand

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[Jscheme-user] [Scheme Steering Committee announcements] R6RS Errata and Electorate; Voting Schedule

[Mitchell W. <wa...@cc...>]

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[Jscheme-user] [Scheme Steering Committee announcements] Important: Schedule for Registration and Voting on R6RS

[Mitchell W. <wa...@cc...>]

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[Jscheme-user] [ANN] Scriba - JScheme Dev tool

[<bor...@ko...>]

Hi all,

I'd like to announce a new tool called Scriba for working with dynamic
languages on the Java platform:

http://www.kobrix.com/scriba.jsp

Here is a synopsis:

- Scripting development for dynamic languages implementing the JSR 223 spec.
- UI inspired from the Mathematica system. You work with notebooks
composed of cells. Different languages, UI elements and HTML comments are
intermixed into self-contained notebooks.
- Multiple evaluation contexts, each having its own classpath, like
projects in a workspace.
- Free, open-source.
- Currently BeanShell and JScheme are bundled in the distribution. Other
languages can be very easily integrated.

I've been using in my daily work for prototyping and testing for some
time. It's been in development for the past year or so and we're eager to
get feedback from people. Please give it a shot and let us
know what you think!

Regards,
Boris

[Jscheme-user] Usage of elf/future.scm

[Kyle R. B. <kyl...@gm...>]

I've been looking at the future module and I've noticed a few things that
look strange.  In touch, it is using backquote, but it looks like it should
not be.  Also, the 'constructor' macro 'future' might be more useful it was
defined as:

  (define-macro (future . body) `(%make-future (lambda () ,@body)))

instead of it's current:

  (define-macro (future exp) `(%make-future (lambda () ,exp)))

since it would then allow multiple statements in the expression.

When I redefine join to not use the backquote it then seems to work
correctly.


Should I send a patch or commit the update to CVS?


Thanks,

Kyle R. Burton

[Jscheme-user] Report from R6RS Editors Committee

[Mitchell W. <wa...@cc...>]

I am extremely pleased to announce that a draft version of R6RS is now
available at www.r6rs.org .  A copy will also be posted on
schemers.org .

The charter provides for a six-month public comment period.  Therefore
the editors, in consultation with the steering committee, have
provided a mechanism for comment and discussion.  Details are also at
www.r6rs.org .  

The comment period is now open and will continue until March 15, 2007.

The steering committee thanks the editors for their intensive work on
the draft R6RS, and looks forward to the public comment period.

Enjoy!

For the Steering Committee,
--Mitch Wand

[Jscheme-user] javax.script.* support

[<bor...@ko...>]

Hi all,

Any efforts/plans to support the new Java Scripting spec (JSR 223)?

If not, I'd be willing to work on it.

Best,
Boris

[Jscheme-user] elf/future.scm

[Kyle R. B. <kyl...@gm...>]

The future code makes sense to me, but doesn't work.

The function touch is returning a list - which is the code that I
would have expected it to execute.

Touch looks like this:

(define (touch f)
  (if (future? f)
      `(let ((thread (%future-thread f)))
	 (if thread (.join thread))
	 (if (%future-exception f) (throw (%future-exception f))
	     (%future-value f)))
      f))

I think the backquote just needs to be removed for this to be correct
(it works for me):

(define (touch f)
  (if (future? f)
      (let ((thread (%future-thread f)))
	 (if thread (.join thread))
	 (if (%future-exception f) (throw (%future-exception f))
	     (%future-value f)))
      f))

When I do this it does what I expect.  Is this something anyone else
has used?  Am I not getting something about how it's supposed to be
used or works?



Thanks,

Kyle


This is the test I was trying to run:

(define (run-parallel . functions)
  (map
   touch
   (map
    (lambda (func)
      (%make-future func))
    functions)))

(run-parallel
 (lambda () 3)
 (lambda () 4))

 ;; => (3 4)

[Jscheme-user] Report from R6RS Editors Committee

[Mitchell W. <wa...@cc...>]

I am pleased to announce that an updated comprehensive status report
from the R6RS editors is now available at www.schemers.org .

For the Steering Committee,
--Mitch Wand

[Jscheme-user] configuring import & classpath lists

[Geoffrey K. <ge...@kn...>]

I needed a way to add a bunch of JARs to my classpath, and I wanted  
to be able to configure where they lived.  The following small  
example is what I came up with.  The idea is that a configuration  
driver could build up jars-to-add.

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk

-----

(load "elf/classpath.scm")

(define (list-full-jar-names dir name-list)
   (map
    (lambda (name)
      (string-append dir "/" name ".jar"))
    name-list))

(define jars-to-add
   (list-full-jar-names
    (string-append (System.getProperty "user.home") "/lib/jar")
    (list "lava3-core" "lava3-printf")))

(for-each (lambda (j) (addClasspathUrl j)) jars-to-add)

Re: [Jscheme-user] capture command output in string?

[Geoffrey K. <ge...@kn...>]

That worked perfectly.  Thank you, Sir!  --Geoffrey

On Apr 22, 2006, at 22:13, Timothy John Hickey wrote:

> You need to create a StringWriter object w,
> wrap it in a PrinterWriter object p, and pass that object as the  
> second parameter to the "out" method.
> Invoking .toString on the w object will give you your string....
>
> Here's an example...
>
> > (define w (java.io.StringWriter.))
>
> > (out (run (cmd (ls -l "."))) (java.io.PrintWriter. w))
> 0
> > (display (.toString w))
> total 155416
> drwx------  45 tim  tim      1530 22 Apr 09:56 Desktop
> drwx------  67 tim  tim      2278 18 Apr 07:58 Documents
> drwx------  44 tim  tim      1496 10 Apr 17:47 Library
> drwx------   6 tim  tim       204  1 Apr 19:49 Movies
> drwx------   5 tim  tim       170 30 Jan  2005 Music
> drwx------   4 tim  tim       136  7 Jan 20:08 Pictures
> ---snip---

Re: [Jscheme-user] capture command output in string?

[Timothy J. H. <ti...@cs...>]

On Apr 22, 2006, at 7:44 PM, Geoffrey Knauth wrote:

> I'm running a command and I'd like to capture the output in a string.   
> For example:
>
> 	(out (run (cmd (wc -l ,filename))))
>
> I tried wrapping a ByteArrayOutputStream in a PrintStream, but that  
> didn't seem to do anything.

You need to create a StringWriter object w,
wrap it in a PrinterWriter object p, and pass that object as the second  
parameter to the "out" method.
Invoking .toString on the w object will give you your string....

Here's an example...

 > (define w (java.io.StringWriter.))

 > (out (run (cmd (ls -l "."))) (java.io.PrintWriter. w))
0
 > (display (.toString w))
total 155416
drwx------  45 tim  tim      1530 22 Apr 09:56 Desktop
drwx------  67 tim  tim      2278 18 Apr 07:58 Documents
drwx------  44 tim  tim      1496 10 Apr 17:47 Library
drwx------   6 tim  tim       204  1 Apr 19:49 Movies
drwx------   5 tim  tim       170 30 Jan  2005 Music
drwx------   4 tim  tim       136  7 Jan 20:08 Pictures
---snip---


Best,
---Tim---


>
> Geoffrey
> --
> Geoffrey S. Knauth | http://knauth.org/gsk
>
>
>
>
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services,  
> security?
> Get stuff done quickly with pre-integrated technology to make your job  
> easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache  
> Geronimo
> http://sel.as-us.falkag.net/sel? 
> cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Jscheme-user mailing list
> Jsc...@li...
> https://lists.sourceforge.net/lists/listinfo/jscheme-user

[Jscheme-user] capture command output in string?

[Geoffrey K. <ge...@kn...>]

I'm running a command and I'd like to capture the output in a  
string.  For example:

	(out (run (cmd (wc -l ,filename))))

I tried wrapping a ByteArrayOutputStream in a PrintStream, but that  
didn't seem to do anything.

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk

[Jscheme-user] Report from the Scheme Language Steering Committee

[Mitchell W. <wa...@cc...>]

Scheme Language Steering Committee Report to the Community

March 7, 2006

Since the last report of the Steering Committee, a number of important
changes have taken place.

First, Marc Feeley and Manuel Serrano have resigned from the Editors
Committee.  We have accepted their resignations with regret, and with
gratitude for the efforts they have expended to produce a revised
Scheme standard. 

In light of these changes, the Steering Committee has amended the
Charter to:

(a) change the number of Editors from seven to five.

(b) replace the office of Editor-in-Chief by a Chair and a Project
Editor.  The Chair is responsible for organizing meetings and other
activities and ensuring that the process makes progress in an orderly
fashion.  The Project Editor is responsible for producing
standardization documents.

The five editors have chosen their Chair and Project Editor.  They
are:

Chair: Kent Dybvig
Project Editor: Mike Sperber

The Editors Committee has now produced a progress report, which is
available at schemers.org.  In it they state their intention to
deliver to the Steering Committee a complete draft R6RS by September
1, 2006.

The Steering Committee looks forward to receiving their draft.

Alternate links to the Editors' Progress Report:

 http://www.cs.indiana.edu/~dyb/r6rs/status.pdf
 http://www.cs.indiana.edu/~dyb/r6rs/status.html