bug#7329: Fwd: 23.2; inferior-python-mode: completion does not work

bug#7329: Fwd: 23.2; inferior-python-mode: completion does not work

[Андрей Парамонов]

---------- Forwarded message ----------
From: Andrey Paramonov <pent@aparamon.msk.ru>
Date: 2010/11/4
Subject: 23.2; inferior-python-mode: completion does not work
To: bug-gnu-emacs@gnu.org
Копия: Andrey Paramonov <cmr.pent@gmail.com>


Hello!

M-Tab completion works for me in python-mode but not in
inferior-python-mode. Please implement M-Tab completion for
inferior-python-mode (it should be easy given it works for python-mode).

I'm ready to provide any additional info,
Andrey Paramonov

In GNU Emacs 23.2.1 (i486-pc-linux-gnu, GTK+ Version 2.20.0)
 of 2010-08-15 on raven, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
configured using `configure  '--build' 'i486-linux-gnu' '--build'
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
'--libexecdir=/usr/lib' '--localstatedir=/var/lib'
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.2/leim'
'--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars'
'build_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g'
'CPPFLAGS=''

Important settings:
 value of $LC_ALL: nil
 value of $LC_COLLATE: nil
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 value of $LC_MONETARY: nil
 value of $LC_NUMERIC: nil
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 value of $LANG: ru_RU.UTF-8
 value of $XMODIFIERS: nil
 locale-coding-system: utf-8-unix
 default enable-multibyte-characters: t

Major mode: Inferior Python

Minor modes in effect:
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 delete-selection-mode: t
 show-paren-mode: t
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 file-name-shadow-mode: t
 global-font-lock-mode: t
 font-lock-mode: t
 auto-encryption-mode: t
 auto-compression-mode: t
 column-number-mode: t
 line-number-mode: t
 global-visual-line-mode: t
 visual-line-mode: t
 transient-mark-mode: t

Load-path shadows:
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Features:
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system-font-setting font-render-setting gtk x-toolkit x multi-tty emacs)

bug#7329: [Patch] Enable completion in inferior-python-mode

[Андрей Парамонов]

[-- Attachment #1: Type: text/plain, Size: 451 bytes --]

Hello!

I've managed to enable completion in Python interpreter buffer, patch
attached. The change in python-check-comint-prompt also fixes
completion in Python buffer when prompt in interpreter buffer is not
clear (a command is entered but not yet executed).

I didn't notice any regressions yet, but maybe the "\\="-thingy was
actually meaning something :-)  Please review my patch, I'm ready to
improve it if needed.

Best wishes,
Andrey Paramonov

[-- Attachment #2: inferior-python-completion.patch --]
[-- Type: text/x-diff, Size: 1012 bytes --]

--- /home/pent/python.el.orig	2010-11-12 21:55:47.000000000 +0300
+++ /home/pent/python.el	2010-11-12 21:51:26.000000000 +0300
@@ -1412,6 +1412,8 @@
   (set (make-local-variable 'comint-input-filter) 'python-input-filter)
   (add-hook 'comint-preoutput-filter-functions #'python-preoutput-filter
 	    nil t)
+  (add-hook 'completion-at-point-functions
+            'python-completion-at-point nil 'local)
   ;; Still required by `comint-redirect-send-command', for instance
   ;; (and we need to match things like `>>> ... >>> '):
   (set (make-local-variable 'comint-prompt-regexp)
@@ -1814,7 +1816,7 @@
 information etc.  If PROC is non-nil, check the buffer for that process."
   (with-current-buffer (process-buffer (or proc (python-proc)))
     (save-excursion
-      (save-match-data (re-search-backward ">>> \\=" nil t)))))
+      (save-match-data (re-search-backward "^>>> " nil t)))))
 
 ;; Fixme:  Is there anything reasonable we can do with random methods?
 ;; (Currently only works with functions.)

bug#7329: [Patch] Enable completion in inferior-python-mode

[Stefan Monnier]

> I've managed to enable completion in Python interpreter buffer, patch
> attached. The change in python-check-comint-prompt also fixes
> completion in Python buffer when prompt in interpreter buffer is not
> clear (a command is entered but not yet executed).

> I didn't notice any regressions yet, but maybe the "\\="-thingy was
> actually meaning something :-)  Please review my patch, I'm ready to
> improve it if needed.

> Best wishes,
> Andrey Paramonov
> --- /home/pent/python.el.orig	2010-11-12 21:55:47.000000000 +0300
> +++ /home/pent/python.el	2010-11-12 21:51:26.000000000 +0300
> @@ -1412,6 +1412,8 @@
>    (set (make-local-variable 'comint-input-filter) 'python-input-filter)
>    (add-hook 'comint-preoutput-filter-functions #'python-preoutput-filter
>  	    nil t)
> +  (add-hook 'completion-at-point-functions
> +            'python-completion-at-point nil 'local)
>    ;; Still required by `comint-redirect-send-command', for instance
>    ;; (and we need to match things like `>>> ... >>> '):
>    (set (make-local-variable 'comint-prompt-regexp)
> @@ -1814,7 +1816,7 @@
>  information etc.  If PROC is non-nil, check the buffer for that process."
>    (with-current-buffer (process-buffer (or proc (python-proc)))
>      (save-excursion
> -      (save-match-data (re-search-backward ">>> \\=" nil t)))))
> +      (save-match-data (re-search-backward "^>>> " nil t)))))

That patch doesn't look bad at all.  The \\= construct means "match
point", i.e. (re-search-backward ">>> \\=" nil t) is very much like
(looking-back ">>> ").  So if that doesn't work it's probably because
there is text between the ">>> " prompt and point.
Do you happen to know what that text is, so we can assess whether we can
just plainly ignore it as you do, or whether there's more to it.
E.g. maybe we should use
(re-search-backward "^>>> " (line-beginning-position) t)
so that we won't be searching back for umpteen megabytes of output until
we accidentally find some unrelated prompt.
Then again, maybe the issue is simply that since we're always in the
process-buffer in the first place, point is not at the expected place
(the code currently expects point to stay put right after the prompt,
whereas in the inferior-python case point may have simply been pushed
down by the process's output), in which case the right solution may be
to explicitly store the earlier position of point and don't expect that
(with-current-buffer (process-buffer (or proc (python-proc))) will
automatically place us back at the same position.


        Stefan

bug#7329: [Patch] Enable completion in inferior-python-mode

[Андрей Парамонов]

2010/11/13 Stefan Monnier <monnier@iro.umontreal.ca>:
> That patch doesn't look bad at all.  The \\= construct means "match
> point", i.e. (re-search-backward ">>> \\=" nil t) is very much like
> (looking-back ">>> ").  So if that doesn't work it's probably because
> there is text between the ">>> " prompt and point.
> Do you happen to know what that text is, so we can assess whether we can
> just plainly ignore it as you do, or whether there's more to it.

The text between >>> and point is what I'm going to complete. I think
it can be anything.

> E.g. maybe we should use
> (re-search-backward "^>>> " (line-beginning-position) t)

Good idea. I missed that re-search-backward jumps over linebreaks by
default. Thinking a bit more, (re-search-backward "^\(>>>|...\) "
(line-beginning-position) t) is even better as it allows completion
inside loops.

> so that we won't be searching back for umpteen megabytes of output until
> we accidentally find some unrelated prompt.
> Then again, maybe the issue is simply that since we're always in the
> process-buffer in the first place, point is not at the expected place
> (the code currently expects point to stay put right after the prompt,
> whereas in the inferior-python case point may have simply been pushed
> down by the process's output), in which case the right solution may be
> to explicitly store the earlier position of point and don't expect that
> (with-current-buffer (process-buffer (or proc (python-proc))) will
> automatically place us back at the same position.
>

My understanding about these checks is to avoid interacting with
interpreter while we at something like

while True:
    pass

or just doing a long processing. For completion we are using the same
interpreter. Requesting completion would freeze Emacs in such a case.

Thanks for your support,
Andrey Paramonov

bug#7329: [Patch] Enable completion in inferior-python-mode

[Андрей Парамонов]

2010/11/16 Андрей Парамонов <cmr.pent@gmail.com>:
> (re-search-backward "^\(>>>|...\) " (line-beginning-position) t)

Should be (re-search-backward "^\(>>>|\.\.\.\) " (line-beginning-position) t)

Andrey Paramonov

bug#7329: [Patch] Enable completion in inferior-python-mode

[Stefan Monnier]

>> That patch doesn't look bad at all.  The \\= construct means "match
>> point", i.e. (re-search-backward ">>> \\=" nil t) is very much like
>> (looking-back ">>> ").  So if that doesn't work it's probably because
>> there is text between the ">>> " prompt and point.
>> Do you happen to know what that text is, so we can assess whether we can
>> just plainly ignore it as you do, or whether there's more to it.

> The text between >>> and point is what I'm going to complete. I think
> it can be anything.

Then maybe another fix is to add a

  (save-excursion
    (goto-char (process-mark (or proc (python-proc))))
    ...)

Since this goto-char should then move point right after the prompt, just
where the current code expects it to be.
    

        Stefan

bug#7329: [Patch] Enable completion in inferior-python-mode

[Андрей Парамонов]

[-- Attachment #1: Type: text/plain, Size: 254 bytes --]

Updated version of the patch attached. It does the following:

1) Enables completion in inferior Python mode.

2) Enables describe-symbol in inferior Python mode.

3) Checks for interpreter more intelligently.

Also it works with 23.2.

Andrey Paramonov

[-- Attachment #2: inferior-python-completion.patch --]
[-- Type: text/x-diff, Size: 5139 bytes --]

--- /home/pent/python.el.orig	2010-11-12 21:55:47.000000000 +0300
+++ /home/pent/python.el	2010-11-19 23:20:14.000000000 +0300
@@ -1365,13 +1365,9 @@
     ;; This will inherit from comint-mode-map.
     (define-key map "\C-c\C-l" 'python-load-file)
     (define-key map "\C-c\C-v" 'python-check)
-    ;; Note that we _can_ still use these commands which send to the
-    ;; Python process even at the prompt iff we have a normal prompt,
-    ;; i.e. '>>> ' and not '... '.  See the comment before
-    ;; python-send-region.  Fixme: uncomment these if we address that.
-
-    ;; (define-key map [(meta ?\t)] 'python-complete-symbol)
-    ;; (define-key map "\C-c\C-f" 'python-describe-symbol)
+    (substitute-key-definition 'complete-symbol 'completion-at-point
+			       map global-map)
+    (define-key map "\C-c\C-f" 'python-describe-symbol)
     map))
 
 (defvar inferior-python-mode-syntax-table
@@ -1412,6 +1408,8 @@
   (set (make-local-variable 'comint-input-filter) 'python-input-filter)
   (add-hook 'comint-preoutput-filter-functions #'python-preoutput-filter
 	    nil t)
+  (add-hook 'completion-at-point-functions
+	    'python-completion-at-point nil 'local)
   ;; Still required by `comint-redirect-send-command', for instance
   ;; (and we need to match things like `>>> ... >>> '):
   (set (make-local-variable 'comint-prompt-regexp)
@@ -1771,50 +1769,51 @@
 			    (format "Describe symbol (default %s): " symbol)
 			  "Describe symbol: ")
 			nil nil symbol))))
-  (if (equal symbol "") (error "No symbol"))
-  ;; Ensure we have a suitable help buffer.
-  ;; Fixme: Maybe process `Related help topics' a la help xrefs and
-  ;; allow C-c C-f in help buffer.
-  (let ((temp-buffer-show-hook		; avoid xref stuff
-	 (lambda ()
-	   (toggle-read-only 1)
-	   (setq view-return-to-alist
-		 (list (cons (selected-window) help-return-method))))))
-    (with-output-to-temp-buffer (help-buffer)
-      (with-current-buffer standard-output
- 	;; Fixme: Is this actually useful?
-	(help-setup-xref (list 'python-describe-symbol symbol)
-			 (called-interactively-p 'interactive))
-	(set (make-local-variable 'comint-redirect-subvert-readonly) t)
-	(help-print-return-message))))
-  (comint-redirect-send-command-to-process (format "emacs.ehelp(%S, %s)"
-						   symbol python-imports)
-   "*Help*" (python-proc) nil nil))
-
-(add-to-list 'debug-ignored-errors "^No symbol")
+  (when (python-check-comint-prompt)
+    (if (equal symbol "") (error "No symbol"))
+    ;; Ensure we have a suitable help buffer.
+    ;; Fixme: Maybe process `Related help topics' a la help xrefs and
+    ;; allow C-c C-f in help buffer.
+    (let ((temp-buffer-show-hook		; avoid xref stuff
+	   (lambda ()
+	     (toggle-read-only 1)
+	     (setq view-return-to-alist
+		   (list (cons (selected-window) help-return-method))))))
+      (with-output-to-temp-buffer (help-buffer)
+	(with-current-buffer standard-output
+	  ;; Fixme: Is this actually useful?
+	  (help-setup-xref (list 'python-describe-symbol symbol)
+			   (called-interactively-p 'interactive))
+	  (set (make-local-variable 'comint-redirect-subvert-readonly) t)
+	  (help-print-return-message))))
+    (comint-redirect-send-command-to-process 
+     (format "emacs.ehelp(%S, %s)" symbol python-imports) 
+     "*Help*" (python-proc) nil nil))
+  (add-to-list 'debug-ignored-errors "^No symbol"))
 
 (defun python-send-receive (string)
   "Send STRING to inferior Python (if any) and return result.
 The result is what follows `_emacs_out' in the output.
 This is a no-op if `python-check-comint-prompt' returns nil."
-  (python-send-string string)
-  (let ((proc (python-proc)))
-    (with-current-buffer (process-buffer proc)
-      (when (python-check-comint-prompt proc)
-	(set (make-local-variable 'python-preoutput-result) nil)
-	(while (progn
-		 (accept-process-output proc 5)
-		 (null python-preoutput-result)))
-	(prog1 python-preoutput-result
-	  (kill-local-variable 'python-preoutput-result))))))
+  (when (python-check-comint-prompt)
+    (python-send-string string)
+    (with-current-buffer (process-buffer (python-proc))
+      (set (make-local-variable 'python-preoutput-result) nil)
+      (while (progn
+	       (accept-process-output (python-proc) 5)
+	       (null python-preoutput-result)))
+      (prog1 python-preoutput-result
+	(kill-local-variable 'python-preoutput-result)))))
 
 (defun python-check-comint-prompt (&optional proc)
   "Return non-nil if and only if there's a normal prompt in the inferior buffer.
 If there isn't, it's probably not appropriate to send input to return Eldoc
 information etc.  If PROC is non-nil, check the buffer for that process."
-  (with-current-buffer (process-buffer (or proc (python-proc)))
-    (save-excursion
-      (save-match-data (re-search-backward ">>> \\=" nil t)))))
+  (let ((process (or proc (python-proc))))
+    (with-current-buffer (process-buffer process)
+      (save-excursion
+	(goto-char (process-mark process))
+	(save-match-data (re-search-backward "^>>> \\=" nil t))))))
 
 ;; Fixme:  Is there anything reasonable we can do with random methods?
 ;; (Currently only works with functions.)

bug#7329: [Patch] Enable completion in inferior-python-mode

[Dave Love]

Thanks for letting me know, but I can't do anything about problems with
the version in Emacs.  The one I maintain has the feature, without the
bugs people tell me about in the Emacs one.  (The communication would
probably be done better with a Python thread separate from the REPL, if
it reflected the REPL's environment, and in this case it would allow
completion in more contexts.)

bug#7329: [Patch] Enable completion in inferior-python-mode

[Lars Magne Ingebrigtsen]

Dave Love <fx@gnu.org> writes:

> Thanks for letting me know, but I can't do anything about problems with
> the version in Emacs.  The one I maintain has the feature, without the
> bugs people tell me about in the Emacs one.

Is there any particular reason why there's an out-of-tree version of
python.el that's newer than the in-tree version?  Would it be possible
to update the in-tree version?

-- 
(domestic pets only, the antidote for overdose, milk.)
  bloggy blog http://lars.ingebrigtsen.no/

bug#7329: [Patch] Enable completion in inferior-python-mode

[Андрей Парамонов]

2012/4/11 Lars Magne Ingebrigtsen <larsi@gnus.org>:
> Is there any particular reason why there's an out-of-tree version of
> python.el that's newer than the in-tree version?  Would it be possible
> to update the in-tree version?

If I remember correctly there was strong desire to update in-tree
version with a set of step-by-step patches. However those patches do
not exist -- the two versions have different origins. To produce such
patchset is a separate hard task which no-one wants to undertake
(sadly for users).

Andrey

bug#7329: [Patch] Enable completion in inferior-python-mode

[Leo]

On 2012-04-11 19:31 +0800, Lars Magne Ingebrigtsen wrote:
> Dave Love <fx@gnu.org> writes:
>
>> Thanks for letting me know, but I can't do anything about problems with
>> the version in Emacs.  The one I maintain has the feature, without the
>> bugs people tell me about in the Emacs one.
>
> Is there any particular reason why there's an out-of-tree version of
> python.el that's newer than the in-tree version?  Would it be possible
> to update the in-tree version?

I would really like to see this happening. I wonder if anyone has tried
python.el + M-x pdb. It was close to unusable the last time (about a
month ago) I tried.

Leo

bug#7329: [Patch] Enable completion in inferior-python-mode

[Lars Magne Ingebrigtsen]

Андрей Парамонов <cmr.pent@gmail.com> writes:

> If I remember correctly there was strong desire to update in-tree
> version with a set of step-by-step patches.

Was there any particular reason why?  It's not like Emacs requires (say)
the Org maintainers to apply changes in a patch-by-patch version, so I'm
not sure why the python.el maintainer should have to...

-- 
(domestic pets only, the antidote for overdose, milk.)
  bloggy blog http://lars.ingebrigtsen.no/

bug#7329: [Patch] Enable completion in inferior-python-mode

[Андрей Парамонов]

2012/4/11 Lars Magne Ingebrigtsen <larsi@gnus.org>:
> Was there any particular reason why?  It's not like Emacs requires (say)
> the Org maintainers to apply changes in a patch-by-patch version, so I'm
> not sure why the python.el maintainer should have to...

Please look up "Current state of python.el in the Emacs trunk" in emacs-devel.

bug#7329: [Patch] Enable completion in inferior-python-mode

[Glenn Morris]

Lars Magne Ingebrigtsen wrote:

> Is there any particular reason why there's an out-of-tree version of
> python.el that's newer than the in-tree version?  Would it be possible
> to update the in-tree version?

Yes. No.

See http://debbugs.gnu.org/cgi/bugreport.cgi?bug=6573#13

for the brief answer; see emacs-devel history for the long version. It's
an unfortunate situation that isn't going to change, so it's probably
best to leave it alone.

bug#7329: Fwd: 23.2; inferior-python-mode: completion does not work

[Chong Yidong]

Андрей Парамонов <cmr.pent@gmail.com> writes:

> M-Tab completion works for me in python-mode but not in
> inferior-python-mode. Please implement M-Tab completion for
> inferior-python-mode (it should be easy given it works for python-mode).

In the version of python.el in the trunk, inferior-python-mode has TAB
completion.  Closing this bug.

bug#7329: Fwd: 23.2; inferior-python-mode: completion does not work

[Андрей Парамонов]

2012/7/28 Chong Yidong <cyd@gnu.org>:
> Андрей Парамонов <cmr.pent@gmail.com> writes:
>
>> M-Tab completion works for me in python-mode but not in
>> inferior-python-mode. Please implement M-Tab completion for
>> inferior-python-mode (it should be easy given it works for python-mode).
>
> In the version of python.el in the trunk, inferior-python-mode has TAB
> completion.  Closing this bug.

Great, thank you! Did you use code by Fabio Ezequiel Gallina?

Best wishes,
Andrey Paramonov

bug#7329: Fwd: 23.2; inferior-python-mode: completion does not work

[Chong Yidong]

Андрей Парамонов <cmr.pent@gmail.com> writes:

> 2012/7/28 Chong Yidong <cyd@gnu.org>:
>> Андрей Парамонов <cmr.pent@gmail.com> writes:
>>
>>> M-Tab completion works for me in python-mode but not in
>>> inferior-python-mode. Please implement M-Tab completion for
>>> inferior-python-mode (it should be easy given it works for python-mode).
>>
>> In the version of python.el in the trunk, inferior-python-mode has TAB
>> completion.  Closing this bug.
>
> Great, thank you! Did you use code by Fabio Ezequiel Gallina?

Yes, his python.el will be the one in Emacs 24.2.

bug#7329: Fwd: 23.2; inferior-python-mode: completion does not work

[Андрей Парамонов]

2012/7/28 Chong Yidong <cyd@gnu.org>:
> Андрей Парамонов <cmr.pent@gmail.com> writes:
>
>> 2012/7/28 Chong Yidong <cyd@gnu.org>:
>>> Андрей Парамонов <cmr.pent@gmail.com> writes:
>>>
>>>> M-Tab completion works for me in python-mode but not in
>>>> inferior-python-mode. Please implement M-Tab completion for
>>>> inferior-python-mode (it should be easy given it works for python-mode).
>>>
>>> In the version of python.el in the trunk, inferior-python-mode has TAB
>>> completion.  Closing this bug.
>>
>> Great, thank you! Did you use code by Fabio Ezequiel Gallina?
>
> Yes, his python.el will be the one in Emacs 24.2.

Awesome news!

Thank you for your great work,
Andrey Paramonov