Trouble running Emacs-EPL (to run perl in emacs).

Trouble running Emacs-EPL (to run perl in emacs).

[Adam Funk]

I'm trying to use Emacs-EPL to run perl commands in emacs.  (My
installation procedure is listed below.)  When I run emacs and do

  M-x load-library perl

I get the message

  Loading perl (source)...done

Then

  M-x perl-eval-expression

and at the "Eval Perl: " prompt I type 

  2+2<CR>

and it hangs until I press C-g.  `ps ux` in another xterm shows the
following processes running (after I used C-g twice and tried a third time):

  emacs
  /usr/bin/perl -MEmacs::EPL=0.007,:server -MEmacs -MEmacs::Lisp -eEmacs::EPL::loop
  /usr/bin/perl -MEmacs::EPL=0.007,:server -MEmacs -MEmacs::Lisp -eEmacs::EPL::loop
  /usr/bin/perl -MEmacs::EPL=0.007,:server -MEmacs -MEmacs::Lisp -eEmacs::EPL::loop

Any idea what I'm doing wrong?

Thanks,
Adam



~~~~~ my installation ~~~~~

I downloaded

  http://john-edwin-tobey.org/perlmacs/src/Emacs-EPL-0.7.tar.gz

and followed the instructions with this result:

  /usr/local/share/perl/5.8.8/
  |-- Emacs
  |   |-- EPL
  |   |   `-- Debug.pm
  |   |-- EPL.pm
  |   |-- Forward.pm
  |   `-- Lisp.pm
  `-- Emacs.pm

(I've checked that /usr/local/share/perl/5.8.8/ is in my perl library
path.)

Then I copied the files
 
  epl-compat.el epl.el epl-server.el perl-core.el perl.el

into ~/.local/site-lisp/ , which is in my load-path in emacs.

Re: Trouble running Emacs-EPL (to run perl in emacs).

[Stefan Monnier]

> I'm trying to use Emacs-EPL to run perl commands in emacs.  (My
> installation procedure is listed below.)  When I run emacs and do
>   M-x load-library perl
> I get the message
>   Loading perl (source)...done
> Then
>   M-x perl-eval-expression
> and at the "Eval Perl: " prompt I type 
>   2+2<CR>
> and it hangs until I press C-g.  `ps ux` in another xterm shows the
> following processes running (after I used C-g twice and tried a third time):
>   emacs
>   /usr/bin/perl -MEmacs::EPL=0.007,:server -MEmacs -MEmacs::Lisp -eEmacs::EPL::loop
>   /usr/bin/perl -MEmacs::EPL=0.007,:server -MEmacs -MEmacs::Lisp -eEmacs::EPL::loop
>   /usr/bin/perl -MEmacs::EPL=0.007,:server -MEmacs -MEmacs::Lisp -eEmacs::EPL::loop
> Any idea what I'm doing wrong?

O know nothing about Emacs-EPL, but if you turn on the
"Enter Debugger on Quit/C-g" in the Options menu, then you should get
a backtrace when you hit C-g.  So reproduce the above hang and then press
C-g to interrupt it and then show us the backtrace.


        Stefan

Re: Trouble running Emacs-EPL (to run perl in emacs).

[Adam Funk]

On 2007-01-24, Stefan Monnier wrote:

>  know nothing about Emacs-EPL, but if you turn on the
> "Enter Debugger on Quit/C-g" in the Options menu, then you should get
> a backtrace when you hit C-g.  So reproduce the above hang and then press
> C-g to interrupt it and then show us the backtrace.

OK, here it is.  I hope someone can read it!


Debugger entered--Lisp error: (quit)
  accept-process-output(#<process perl>)
  (progn (accept-process-output out) (if (eobp) (error "No output from Perl")))
  (if (eobp) (progn (accept-process-output out) (if ... ...)))
  (when (eobp) (accept-process-output out) (if (eobp) (error "No output from Perl")))
  (if ch (progn (unless ... ...) (backward-char)) (when (eobp) (accept-process-output out) (if ... ...)) (forward-char) (char-before))
  (save-current-buffer (set-buffer (epl-interp-buffer)) (if ch (progn ... ...) (when ... ... ...) (forward-char) (char-before)))
  (with-current-buffer (epl-interp-buffer) (if ch (progn ... ...) (when ... ... ...) (forward-char) (char-before)))
  (let* ((out ...)) (with-current-buffer (epl-interp-buffer) (if ch ... ... ... ...)))
  epl-read-char()
  read(epl-read-char)
  (let ((form ...) reply done msg) (epl-debug (format "Emacs(%d)<<< " ...) form "\n") (unwind-protect (setq reply ... done t) (when ... ... ...)) (epl-debug "Reply: " reply " (" (epl-interp-depth) ")\n") (setq msg (car reply) reply (cdr reply)) (cond (... ...) (... ... ... ...) (... nil) (... ... ... ...) (... ...) (... ...) (... ...) (t ...)))
  (while t (let (... reply done msg) (epl-debug ... form "\n") (unwind-protect ... ...) (epl-debug "Reply: " reply " (" ... ")\n") (setq msg ... reply ...) (cond ... ... ... ... ... ... ... ...)) (or epl-debugging (with-current-buffer ... ...)))
  (catch (quote return) (epl-debug "+++ " depth "\n") (epl-interp-set-depth (1+ depth)) (while t (let ... ... ... ... ... ...) (or epl-debugging ...)))
  (unwind-protect (catch (quote return) (epl-debug "+++ " depth "\n") (epl-interp-set-depth ...) (while t ... ...)) (epl-debug "--- " depth "\n") (epl-interp-set-depth depth))
  (let ((depth ...)) (unwind-protect (catch ... ... ... ...) (epl-debug "--- " depth "\n") (epl-interp-set-depth depth)))
  epl-loop()
  (condition-case err (epl-loop) (error (epl-destroy) (signal ... ...)))
  (let* ((process-connection-type nil) (out ...) (epl-interp ...)) (condition-case err (epl-loop) (error ... ...)) (epl-interp-set-status (quote ready)) epl-interp)
  perl-interpreter-new()
  (setq perl-interpreter (perl-interpreter-new))
  (if perl-interpreter (epl-check) (setq perl-interpreter (perl-interpreter-new)))
  epl-init()
  (epl-eval (epl-init) nil context "do { package main; " string " }")
  perl-eval("2+2" scalar-context)
  (prin1-to-string (perl-eval expression (if prefix ... ...)))
  (message (prin1-to-string (perl-eval expression ...)))
  perl-eval-expression("2+2" nil)
* call-interactively(perl-eval-expression)
  execute-extended-command(nil)
* call-interactively(execute-extended-command)

Re: Trouble running Emacs-EPL (to run perl in emacs).

[Stefan Monnier]

>> know nothing about Emacs-EPL, but if you turn on the
>> "Enter Debugger on Quit/C-g" in the Options menu, then you should get
>> a backtrace when you hit C-g.  So reproduce the above hang and then press
>> C-g to interrupt it and then show us the backtrace.

> OK, here it is.  I hope someone can read it!


> Debugger entered--Lisp error: (quit)
>   accept-process-output(#<process perl>)

Hmm... so it's waiting for Perl output.  Presumably, the output has already
arrived but for some reason Emacs-EPL did not recognize it.

You'll have to ask the Emacs-EPL people to debug this.


        Stefan

Re: Trouble running Emacs-EPL (to run perl in emacs).

[Adam Funk]

On 2007-01-26, Stefan Monnier wrote:

>>> know nothing about Emacs-EPL, but if you turn on the
>>> "Enter Debugger on Quit/C-g" in the Options menu, then you should get
>>> a backtrace when you hit C-g.  So reproduce the above hang and then press
>>> C-g to interrupt it and then show us the backtrace.
>
>> OK, here it is.  I hope someone can read it!
>
>
>> Debugger entered--Lisp error: (quit)
>>   accept-process-output(#<process perl>)
>
> Hmm... so it's waiting for Perl output.  Presumably, the output has already
> arrived but for some reason Emacs-EPL did not recognize it.
>
> You'll have to ask the Emacs-EPL people to debug this.

Thanks.  I've taken this to the CPAN forum:

http://www.cpanforum.com/posts/4183