GNU bug report logs - #140
python-try-complete

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Package: emacs; Reported by: Julian Scheid <julians37 <at> googlemail.com>; dated Mon, 14 Apr 2008 20:15:02 UTC; Maintainer for emacs is bug-gnu-emacs <at> gnu.org.

bug reassigned from package `emacs' to `emacs,python'. Request was from Juanma Barranquero <lekktu <at> gmail.com> to control <at> emacsbugs.donarmstrong.com. Full text available.

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Date: Mon, 14 Apr 2008 23:05:59 +1200
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To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
CC: emacs-devel <at> gnu.org
Subject: Re: python-try-complete
References: <47F62CE4.7070903 <at> gmail.com> <jwvr6dcwa9q.fsf-monnier+emacs <at> gnu.org> <4800885A.1090402 <at> gmail.com>
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From: Julian Scheid <julians37 <at> googlemail.com>

> Did you have any thoughts about the second problem I described in the 
> same mail - python-try-complete locking up when used in a remote buffer? 
> To quote from my previous mail,
> 
>   Either python-try-complete should refrain from launching the process
>   remotely by looking at (file-remote-p default-directory), or the
>   scripts it launches need to be prepared (e.g. in terms of quoting) for
>   being run remotely via ssh.

I had a chance to narrow it down a bit more. Here is the stack trace I 
get when I quit while python-try-complete blocks:

Debugger entered--Lisp error: (quit)
   accept-process-output(#<process Python> 5)
   python-send-receive("import emacs; print '_emacs_out ()'")
   run-python(nil t)
   python-proc()
   python-send-string("emacs.complete(\"exitCode\",\"import os\\nimport 
logging\\nimport Queue\\nimport threading\\n\")")
   python-send-receive("emacs.complete(\"exitCode\",\"import os\\nimport 
logging\\nimport Queue\\nimport threading\\n\")")
   byte-code("..." [symbol python-imports read-from-string 
python-send-receive format "emacs.complete(%S,%s)"] 6)
   python-symbol-completions("exitCode")
   (and symbol (python-symbol-completions symbol))
   (setq he-expand-list (and symbol (python-symbol-completions symbol)))
   (let ((symbol ...)) (he-init-string (- ... ...) (point)) (if (not 
...) (push he-search-string he-tried-table)) (setq he-expand-list (and 
symbol ...)))
   (if old nil (let (...) (he-init-string ... ...) (if ... ...) (setq 
he-expand-list ...)))
   (unless old (let (...) (he-init-string ... ...) (if ... ...) (setq 
he-expand-list ...)))
   (progn (unless old (let ... ... ... ...)) (while (and he-expand-list 
...) (pop he-expand-list)) (if he-expand-list (progn ... t) (if old ...) 
nil))
   (if (derived-mode-p (quote python-mode)) (progn (unless old ...) 
(while ... ...) (if he-expand-list ... ... nil)))
   (when (derived-mode-p (quote python-mode)) (unless old (let ... ... 
... ...)) (while (and he-expand-list ...) (pop he-expand-list)) (if 
he-expand-list (progn ... t) (if old ...) nil))
   python-try-complete(nil)
   apply(python-try-complete nil)
   hippie-expand(nil)
   call-interactively(hippie-expand)

And in *Python* I have:

Python 2.3.4 (#1, Feb  2 2005, 12:11:53)
[GCC 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> Traceback (most recent call last):
   File "<stdin>", line 1, in ?
ImportError: No module named emacs
 >>>

Now the interesting thing with the second line of this output is that my 
Emacs is running on top of OS X; Linux is running on the box on which 
the Python file lives that I've opened using Tramp (that was visited 
when I ran hippie-expand.)

So apparently Python gets run remotely (by the magic of Tramp?) but the 
"emacs" package which I suspect python-mode uses for helping with 
completion isn't available on the remote host; thus the whole completion 
attempt fails, but instead of gracefully failing python-try-complete 
sits there indefinitely.

There seem to be two problems here:

1) Proper exception and/or exit code handling is missing which would 
allow the Python script to exit with an error without locking up Emacs.

2) Either the external Python process should be forced to run locally 
even if the file is remote; or python-try-complete should refrain from 
launching a Python process at all if the file is remote; or 
python-try-complete should be prepared for its external process to run 
remotely and set up its environment properly (by uploading the emacs 
module and setting PYTHONPATH accordingly.)

As I said earlier I don't use python-try-complete anymore but FWIW 
simply not running Python when file-remote-p looks to me to be the best 
option.

I'm using Emacs 22.1.2 and tramp 2.1.13.

Hope this helps,

Julian

Acknowledgement sent to Julian Scheid <julians37 <at> googlemail.com>:
Extra info received and forwarded to list. Copy sent to Emacs Bugs <bug-gnu-emacs <at> gnu.org>. Full text available.

Information forwarded to bug-submit-list <at> lists.donarmstrong.com, Emacs Bugs <bug-gnu-emacs <at> gnu.org>:
bug#140; Package emacs. Full text available.

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Date: Sat, 12 Apr 2008 22:00:58 +1200
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To: Stefan Monnier <monnier <at> iro.umontreal.ca>
References: <47F62CE4.7070903 <at> gmail.com>
	<jwvr6dcwa9q.fsf-monnier+emacs <at> gnu.org>
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From: Julian Scheid <julians37 <at> googlemail.com>
Cc: emacs-devel <at> gnu.org
Subject: Re: python-try-complete
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>> I take issue with one of its design decisions however: sneaking in
>> python-try-complete into hippie-expand-try-functions-list.
> 
> Agreed, it should be fixed on the EMACS_22_BASE branch now,

Thanks for that, Stefan.

Did you have any thoughts about the second problem I described in the 
same mail - python-try-complete locking up when used in a remote buffer? 
To quote from my previous mail,

   Either python-try-complete should refrain from launching the process
   remotely by looking at (file-remote-p default-directory), or the
   scripts it launches need to be prepared (e.g. in terms of quoting) for
   being run remotely via ssh.

I am not using python-try-complete anymore but this is a bug and I would 
be happy to help fix it.

Julian

Acknowledgement sent to Julian Scheid <julians37 <at> googlemail.com>:
New bug report received and forwarded. Copy sent to Emacs Bugs <bug-gnu-emacs <at> gnu.org>. Full text available.

Report forwarded to bug-submit-list <at> lists.donarmstrong.com, Emacs Bugs <bug-gnu-emacs <at> gnu.org>:
bug#140; Package emacs. Full text available.

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Last modified: Tue, 20 Sep 2011 19:45:02 UTC

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GNU bug report logs - #140 python-try-complete

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GNU bug report logs - #140
python-try-complete