GNU bug report logs - #45922
27.1; Better auto-fill for strings in python-mode

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

From: Акимжанчег <zelenaruta <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; Better auto-fill for strings in python-mode
Date: Sun, 17 Jan 2021 03:49:16 +0600

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

Date: Sun, 17 Jan 2021 03:45:31 +0600
Message-ID: <875z3wd090.fsf <at> gmail.com>
--text follows this line--

Today I was making a program in Python for myself. One of the functions
required me to pass a long string to it, so I did that. Auto-fill-mode
got triggered when I pressed the space bar and the string was split from
this:
```
matrix = self.getprop("Coordinate Transformation Matrix").split(", ")
```
To this:
```
matrix = self.getprop("Coordinate Transformation
                                  Matrix").split(", ")
```
After that, I saw `SyntaxError: EOL while scanning string literal'.
This can be fixed with two different methods:
1. Adding a `+' between the strings, so that it looks like
```
matrix = self.getprop("Coordinate Transformation"
                     +"Matrix").split(", ")
```
2. Dividing the string to 2 separate strings:
```
matrix = self.getprop("Coordinate Transformation"
                      "Matrix").split(", ")


In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.22,
cairo version 1.17.3)
 of 2020-08-29 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
System Description: Arch Linux

Recent messages:
invalid syntax [2 times]
Auto-saving...
EOL while scanning string literal
Auto-saving...
EOL while scanning string literal
Mark set
invalid syntax
Auto-saving...
End of buffer
delete-backward-char: Text is read-only [2 times]

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[Message part 2 (text/html, inline)]

Message #8 received at 45922 <at> debbugs.gnu.org (full text, mbox):

From: Tomas Nordin <tomasn <at> posteo.net>
To: Акимжанчег <zelenaruta <at> gmail.com>,
 45922 <at> debbugs.gnu.org
Subject: Re: bug#45922: 27.1; Better auto-fill for strings in python-mode
Date: Sun, 17 Jan 2021 12:58:38 +0100

Hello Акимжанчег

Акимжанчег <zelenaruta <at> gmail.com> writes:

> Date: Sun, 17 Jan 2021 03:45:31 +0600
> Message-ID: <875z3wd090.fsf <at> gmail.com>
> --text follows this line--
>
> Today I was making a program in Python for myself. One of the functions
> required me to pass a long string to it, so I did that. Auto-fill-mode
> got triggered when I pressed the space bar and the string was split from
> this:
> ```
> matrix = self.getprop("Coordinate Transformation Matrix").split(", ")
> ```
> To this:
> ```
> matrix = self.getprop("Coordinate Transformation
>                                   Matrix").split(", ")
> ```
> After that, I saw `SyntaxError: EOL while scanning string literal'.
> This can be fixed with two different methods:
> 1. Adding a `+' between the strings, so that it looks like
> ```
> matrix = self.getprop("Coordinate Transformation"
>                      +"Matrix").split(", ")
> ```
> 2. Dividing the string to 2 separate strings:
> ```
> matrix = self.getprop("Coordinate Transformation"
>                       "Matrix").split(", ")

From the recepie it would seem like fill-column is set to something low.
But probably you have some indentation there prior to 'matrix = ...'?

I don't think there is something in python mode that do what you are
suggesting as of now. For curiosity, do you see this kind of support in
other editors?

nit: the 2 suggestions would loose a space in the string

Message #11 received at 45922 <at> debbugs.gnu.org (full text, mbox):

From: Tomas Nordin <tomasn <at> posteo.net>
To: Акимжанчег <zelenaruta <at> gmail.com>
Cc: 45922 <at> debbugs.gnu.org
Subject: Re: bug#45922: 27.1; Better auto-fill for strings in python-mode
Date: Sun, 17 Jan 2021 21:18:40 +0100

Акимжанчег <zelenaruta <at> gmail.com> writes:

>>
>>
>> From the recepie it would seem like fill-column is set to something low.
>> But probably you have some indentation there prior to 'matrix = ...'?
>>
> Yes there were 8 spaces before that
>
>> I don't think there is something in python mode that do what you are
>> suggesting as of now. For curiosity, do you see this kind of support in
>> other editors?
>>
> Emacs is the only editor I ever used, but when I write a comment and reach
> the fill-column auto-fill-mode opens a new line and puts the comment
> character there, so I thought if it does it for comments then it might as
> well do it for strings.

The one and true editor. I /think/ the filling of comments gets handled
by fill.el. Filling of one-line strings would have to be handled by
python.el. I was looking to see if it tries to support that but couldn't
find indications it does. Cannot find that it documents to support it.

I agree it could be convenient and understand the expectation based on
the comment filling. Might be difficult to implement tho.

Message #14 received at 45922 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Акимжанчег <zelenaruta <at> gmail.com>
Cc: 45922 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#45922: 27.1; Better auto-fill for strings in python-mode
Date: Sat, 07 May 2022 17:51:14 +0200

Акимжанчег <zelenaruta <at> gmail.com> writes:

> Today I was making a program in Python for myself. One of the functions
> required me to pass a long string to it, so I did that. Auto-fill-mode
> got triggered when I pressed the space bar and the string was split from
> this:
> ```
> matrix = self.getprop("Coordinate Transformation Matrix").split(", ")
> ```
> To this:
> ```
> matrix = self.getprop("Coordinate Transformation
>                                   Matrix").split(", ")
> ```
> After that, I saw `SyntaxError: EOL while scanning string literal'.

I can reproduce this in Emacs 29, too.

The Python auto fill basically just calls `do-auto-fill', so I wondered
whether there was something simple to tell that function to not consider
any points where ppss-string-terminator is non-nil as a break point, but
apparently not?  (It seems like such an obvious thing to have, so
perhaps there's a good reason we don't have that.)

I've added Stefan to the CCs; perhaps he has some comments.

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

Message #19 received at 45922 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Акимжанчег <zelenaruta <at> gmail.com>,
 45922 <at> debbugs.gnu.org
Subject: Re: bug#45922: 27.1; Better auto-fill for strings in python-mode
Date: Sat, 07 May 2022 12:25:21 -0400

> The Python auto fill basically just calls `do-auto-fill', so I wondered
> whether there was something simple to tell that function to not consider
> any points where ppss-string-terminator is non-nil as a break point, but
> apparently not?

`fill-nobreak-predicate`?


        Stefan

Message #22 received at 45922 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Акимжанчег <zelenaruta <at> gmail.com>,
 45922 <at> debbugs.gnu.org
Subject: Re: bug#45922: 27.1; Better auto-fill for strings in python-mode
Date: Sat, 07 May 2022 18:56:51 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> The Python auto fill basically just calls `do-auto-fill', so I wondered
>> whether there was something simple to tell that function to not consider
>> any points where ppss-string-terminator is non-nil as a break point, but
>> apparently not?
>
> `fill-nobreak-predicate`?

Ah, yes, perfect.  With this, it works like the original bug reporter
wanted:

              (setq-local fill-nobreak-predicate
              (lambda ()
                (ppss-string-terminator (syntax-ppss))))

But this reminds me that auto-fill-mode in programming modes is a bad
idea in general: Even if it doesn't chop anything inside the string,
it'll still lead to invalid code.

So I think the answer to this bug report is really -- don't use
auto-fill in python-mode, and I'm closing it as a wontfix.

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

Message #29 received at 45922 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Акимжанчег <zelenaruta <at> gmail.com>,
 45922 <at> debbugs.gnu.org
Subject: Re: bug#45922: 27.1; Better auto-fill for strings in python-mode
Date: Sat, 07 May 2022 13:28:15 -0400

> But this reminds me that auto-fill-mode in programming modes is a bad
> idea in general:

Or at least, it needs to be custom-tailored (as in `smie-auto-fill` or
things along these lines).

In many/most programming languages the only real trouble is
inserting/adding newlines inside strings or newline-terminated comments.

> So I think the answer to this bug report is really -- don't use
> auto-fill in python-mode, and I'm closing it as a wontfix.

Yup, in python-mode (and other programming modes where LF is not always
treated as whitespace) it does need a lot more care.


        Stefan

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