GNU bug report logs - #32390
[ipython 6.x] unmatched quotes break fontification in python.el (superseded by #33959)

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; python.el: cleanup font lock buffer after input is sent
Date: Tue, 07 Aug 2018 15:49:34 -0300

font-locking gets often confused because of unclosed string delimiters.
For example, type " and then press return, start typing in the new input
prompt and the input will be identified as a docstring. It's ok to keep
the font lock buffer while doing multiline edition, but after input is
sent to the underlying process the buffer should be cleaned up so that
each input is independently colorized.

---

In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-07-05 built on juergen
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Message #8 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: 32390 <at> debbugs.gnu.org
Date: Tue, 7 Aug 2018 16:10:24 -0300

The buffer is indeed being cleaned up in the output filter:

(defun python-shell-font-lock-comint-output-filter-function (output)
  (if (and (not (string= "" output))
      ...
      (python-shell-font-lock-cleanup-buffer)

The problem is that an unclosed string is an error and in that case
output is "", so that the cleanup part is not reached. I think it
should be made unconditional.

Message #11 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: 32390 <at> debbugs.gnu.org
Subject: Re:
Date: Tue, 7 Aug 2018 16:34:41 -0300

Sorry, it's not the first condition that is failing but the second one:

           (not (member
                 (python-shell-comint-end-of-output-p
                  (ansi-color-filter-apply output))
                 '(nil 0))))

(ansi-color-filter-apply output) is removing the error message so that
only the next input prompt remains. The entire expression evaluates to
nil for error output, at least when:

 '(python-shell-interpreter "ipython")
 '(python-shell-interpreter-args "-i --simple-prompt")

Message #14 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: 32390 <at> debbugs.gnu.org
Subject: Re:
Date: Tue, 7 Aug 2018 16:52:44 -0300

Why not simply:

           (python-shell-comint-end-of-output-p
            (ansi-color-filter-apply output)))

?

What is the problem when just an input prompt is retrieved (that is,
the 0 case in (nil 0))?

Message #17 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: 32390 <at> debbugs.gnu.org
Subject: Re:
Date: Tue, 7 Aug 2018 17:28:01 -0300

The current condition is also failing for multiline input. Consider:


In [154]: def f():
     ...:   'ewewe
     ...:

output is "     ...:" so it's not considered just an input prompt
(because of the preceding whitespace) and so the font lock buffer is
wrongly cleaned up (indeed, this is the only case I'm able to figure
out for which you don't want to cleanup the buffer).

I think the condition should be reformulated to match any expression
that ends with an input prompt excluding a continuation prompt. This
would fix both problems:

1. An expression that is just an input prompt (for example, ansi
filtered errors) will trigger a cleanup.
2. A continuation input prompt will not be considered the start of
a new input.

Message #20 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Carlos Pita <carlosjosepita <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1;
 python.el: cleanup font lock buffer after input is sent
Date: Wed, 22 Aug 2018 23:24:41 -0400

[Message part 1 (text/plain, inline)]

Carlos Pita <carlosjosepita <at> gmail.com> writes:

> font-locking gets often confused because of unclosed string delimiters.
> For example, type " and then press return, start typing in the new input
> prompt and the input will be identified as a docstring.

I can't reproduce this.  The next input looks normal to me.

[bug-32390-run-python-unclosed-string.png (image/png, attachment)]

Message #25 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1; python.el: cleanup font lock buffer after input
 is sent
Date: Fri, 31 Aug 2018 08:56:58 -0300

[Message part 1 (text/plain, inline)]

My report was for ipython. I've attached a screenshot showing the problem.

The way I'm fixing this issue at the moment is by patching
python-shell-font-lock-comint-output-filter-function like this:

(defun python-shell-font-lock-comint-output-filter-function (output)
  "Clean up the font-lock buffer after any OUTPUT."
  (if (and (python-shell-comint-end-of-output-p
            (ansi-color-filter-apply output))
           (not (string-match "\\.\\.\\.: $" output)))
      ;; If output is other than an input prompt then "real" output has
      ;; been received and the font-lock buffer must be cleaned up.
      (python-shell-font-lock-cleanup-buffer)
    ;; Otherwise just add a newline.
    (python-shell-font-lock-with-font-lock-buffer
      (goto-char (point-max))
      (newline)))
  output)

[Screenshot_2018-08-31_08:54:00.png (image/png, attachment)]

Message #28 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Carlos Pita <carlosjosepita <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1;
 python.el: cleanup font lock buffer after input is sent
Date: Fri, 31 Aug 2018 23:01:01 -0400

[Message part 1 (text/plain, inline)]

Carlos Pita <carlosjosepita <at> gmail.com> writes:

> My report was for ipython. I've attached a screenshot showing the problem.

I still can't reproduce.  What is your ipython version (mine is 5.1.0)?

[bug-32390-run-ipython-unclosed-string.png (image/png, attachment)]

Message #31 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1; python.el: cleanup font lock buffer after input
 is sent
Date: Wed, 5 Sep 2018 12:38:42 -0300

[Message part 1 (text/plain, inline)]

Please, look at the version information in the attached screenshot.

My shell config is:

 '(python-shell-interpreter "ipython")
 '(python-shell-interpreter-args "-i --simple-prompt")

[Screenshot_2018-09-05_12:38:24.png (image/png, attachment)]

Message #34 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Carlos Pita <carlosjosepita <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1;
 python.el: cleanup font lock buffer after input is sent
Date: Wed, 05 Sep 2018 22:27:25 -0400

retitle 32390 [ipython 6.x] unmatched quotes break fontification in run-python
tags 32390 = confirmed
quit

Carlos Pita <carlosjosepita <at> gmail.com> writes:

> Please, look at the version information in the attached screenshot.

Aha, ipython 6.x strikes again.

> My shell config is:
>
>  '(python-shell-interpreter "ipython")
>  '(python-shell-interpreter-args "-i --simple-prompt")

I can reproduce it when running with ipython 6.x, although it seems to
only happen the first time.  If enter 'x = "' again, then it works as
expected.

Message #41 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Carlos Pita <carlosjosepita <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: [ipython 6.x] unmatched quotes break fontification in
 run-python
Date: Wed, 05 Sep 2018 22:32:04 -0400

Carlos Pita <carlosjosepita <at> gmail.com> writes:

> Why not simply:
>
>            (python-shell-comint-end-of-output-p
>             (ansi-color-filter-apply output)))
>
> ?
>
> What is the problem when just an input prompt is retrieved (that is,
> the 0 case in (nil 0))?

I guess that's the "not just a prompt" in the comment:

           ;; Is end of output and is not just a prompt.

But it seems that python.el is assuming a certain chunking of output
from the subprocess, which is really not a safe assumptiong.  And
ipython 6 breaks it.

> The current condition is also failing for multiline input. Consider:
>
>
> In [154]: def f():
>      ...:   'ewewe
>      ...:
>
> output is "     ...:" so it's not considered just an input prompt
> (because of the preceding whitespace) and so the font lock buffer is
> wrongly cleaned up (indeed, this is the only case I'm able to figure
> out for which you don't want to cleanup the buffer).
>
> I think the condition should be reformulated to match any expression
> that ends with an input prompt excluding a continuation prompt. This
> would fix both problems:
>
> 1. An expression that is just an input prompt (for example, ansi
> filtered errors) will trigger a cleanup.
> 2. A continuation input prompt will not be considered the start of
> a new input.

This sounds quite sensible to me.

Message #44 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1; python.el: cleanup font lock buffer after input
 is sent
Date: Wed, 12 Sep 2018 13:56:36 -0300

> I can reproduce it when running with ipython 6.x, although it seems to
> only happen the first time.  If enter 'x = "' again, then it works as
> expected.


I think this is because the second time you're closing the previously
opened string. But try one more time and it should begin alternating
between string / non-string faces.

Message #47 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1; python.el: cleanup font lock buffer after input
 is sent
Date: Tue, 4 Dec 2018 19:35:09 -0300

[Message part 1 (text/plain, inline)]

Hi Noam,

I've been carefully studying this issue and below I explain in detail
what is really happening and what different cases are being (sometimes
wrongly) covered. There is a patch attached, I hope you consider it
worth of being applied.

The condition for cleaning up of the font lock buffer is:

-------------
  (if (and (not (string= "" output))                             (1)
           ;; Is end of output and is not just a prompt.
           (not (member
                 (python-shell-comint-end-of-output-p
                  (ansi-color-filter-apply output))
                 '(nil
         (2)
                   0))))
        (3)
-------------

First nota that (1) is really irrelevant since
(python-shell-comint-end-of-output-p "") returns nil anyway.

Now, the problem originating this report was:

-------------
In [15]: "
  File "<ipython-input-15-3b7a06bb1102>", line 1
    "
     ^
SyntaxError: EOL while scanning string literal


In [16]:   string face still here"
-------------

This happens because
python-shell-font-lock-comint-output-filter-function is called twice,
first for the error output and then for the "In [16]: " part (I assume
this is because one part is coming from stderr and the other from
stdout, but that's just a guess). The first time (2) applies since
we're *not* at the end of an input prompt. The second time (3) applies
since we're at the end of *just* and input prompt. So in any case the
buffer is cleaned up.

Now, my first reaction was to ignore the *just* part: what damage
could it do to just check if we're at the end of an input prompt
disregarding the fact that it could be the only thing there? Well, the
problem is with multiline input, of course. Nevertheless the current
code is relying in a very weak rule: it considers "just an input
prompt" to be a continuation prompt. Another unreliable aspect of the
current rule is that sometimes (python-shell-comint-end-of-output-p
(ansi-color-filter-apply output)) returns 1 and not 0 for continuation
prompts. In short, the rule does a very poor job identifying
continuations.

So, all in all I had rewritten (in a previous post) the condition above as:

-------------
  (if (and (python-shell-comint-end-of-output-p
            (ansi-color-filter-apply output))
           (not (string-match "\\.\\.\\.: $" output)))        (4)
-------------

Where:
- Clause (1) is disregarded because it's redundant.
- Clause (2) is taken into account.
- Clause (3) is disregarded because it's unreliable.
- Clause (4) was added to address the multiline input case
(continuation prompt).

Now, it's a sad fact that python-shell-prompt-input-regexps doesn't
distinguish between initial and continuation input prompts, so I
explicitly had to put that particular regexp there. I assume this is
the main reason while my fix was not yet accepted, isn't it?

At this point we have at least two alternatives:

a) Consider that an input prompt that includes the pattern "\\.\\.\\."
is a continuation prompt. This is a heuristic but I think it's robust
enough. I favor this solution and the attached patch implements it.

b) Add a new customization option with a list of continuation prompts.
I believe this would be too much.

So the attached patch implements this new rule:

-------------
    (if (let ((output (ansi-color-filter-apply output)))
        (and (python-shell-comint-end-of-output-p output)
             (not (string-match "\\.\\.\\." output))))       (5)
-----------

The difference between (4) and (5) is that (5) relaxes the match to
just include three sequential dots (because we already know we have an
input prompt at the end of the output!). I've been more careful by
matching on the filtered string instead of the raw one also.

Please let me know if you prefer option (b) instead.

Best regards
--
Carlos

[font-lock-cleanup-filter.diff (text/x-patch, attachment)]

Message #52 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1; python.el: cleanup font lock buffer after input
 is sent
Date: Wed, 5 Dec 2018 13:00:06 -0300

> stdout, but that's just a guess). The first time (2) applies since
> we're *not* at the end of an input prompt. The second time (3) applies
> since we're at the end of *just* and input prompt. So in any case the
> buffer is cleaned up.

Sorry, this must have said "in NO case the buffer is cleaned up".

Message #55 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1; python.el: cleanup font lock buffer after input
 is sent
Date: Thu, 3 Jan 2019 02:43:13 -0300

Please take a look at the related
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=33959 since I've added a
patch there that fixes both this and other issue. The patch is
essentially the one above plus a fix for a strange interaction with
company that makes the output filter populate the font lock buffer
with spurious empty lines. Since both changes overlap I combined them
into a single patch (I provided a separated one also, if you prefer).

Message #58 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: 32390 <at> debbugs.gnu.org
Date: Thu, 14 Feb 2019 08:50:09 -0300

retitle 32390 [ipython 6.x] unmatched quotes break fontification in python.el (superseded by #33959)
tags 32390 = confirmed
quit

Retitled in order to make it match "python" in the search interface and
to notify that #33959 contains and overlapping patch for this and other
issue.

Message #65 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Carlos Pita <carlosjosepita <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1;
 python.el: cleanup font lock buffer after input is sent
Date: Mon, 14 Oct 2019 20:21:21 -0400

tags 32390 fixed
close 32390 27.1
quit

Carlos Pita <carlosjosepita <at> gmail.com> writes:

> Please take a look at the related
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=33959 since I've added a
> patch there that fixes both this and other issue. The patch is
> essentially the one above plus a fix for a strange interaction with
> company that makes the output filter populate the font lock buffer
> with spurious empty lines. Since both changes overlap I combined them
> into a single patch (I provided a separated one also, if you prefer).

I think these changes are confusing enough on their own, without trying
to combine things.  The patch you posted here seems okay, so I've
applied to master now.

[1: 7acc621e37]: 2019-10-14 20:09:38 -0400
  Fix python-shell font-lock cleanup for unclosed quotes (Bug#32390)
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=7acc621e373ba1371495e15e5e78aa6ce948a9a6

Message #72 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1; python.el: cleanup font lock buffer after input
 is sent
Date: Mon, 14 Oct 2019 21:27:36 -0300

Thanks Noam,

do you want me to provide a separate patch for the other issue that
applies on top of this one?

Remember that I had provided a separate but independent one in
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=33959;att=1;msg=18;filename=0001-Avoid-spurious-empty-lines-in-font-lock-buffer-fixes.patch,
which will surely result in conflicts.

Message #75 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita <at> gmail.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1; python.el: cleanup font lock buffer after input
 is sent
Date: Mon, 14 Oct 2019 21:30:31 -0300

Also, shouldn't this be applied to emacs-26 besides of master? I mean,
it's a bugfix.

Message #78 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Carlos Pita <carlosjosepita <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org, Noam Postavsky <npostavs <at> gmail.com>
Subject: Re: bug#32390: 26.1; python.el: cleanup font lock buffer after
 input is sent
Date: Tue, 15 Oct 2019 02:36:56 +0200

Carlos Pita <carlosjosepita <at> gmail.com> writes:

> Also, shouldn't this be applied to emacs-26 besides of master? I mean,
> it's a bugfix.

There won't be any more Emacs 26 releases -- nothing is applied to that
branch at present.

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

Message #81 received at 32390 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Carlos Pita <carlosjosepita <at> gmail.com>
Cc: 32390 <at> debbugs.gnu.org
Subject: Re: bug#32390: 26.1;
 python.el: cleanup font lock buffer after input is sent
Date: Mon, 14 Oct 2019 20:40:05 -0400

Carlos Pita <carlosjosepita <at> gmail.com> writes:

> Also, shouldn't this be applied to emacs-26 besides of master? I mean,
> it's a bugfix.

emacs-26 is pretty much closed.

https://debbugs.gnu.org/37527#95

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