* bug#45922: 27.1; Better auto-fill for strings in python-mode
@ 2021-01-16 21:49 Акимжанчег
2021-01-17 11:58 ` Tomas Nordin
2022-05-07 15:51 ` Lars Ingebrigtsen
0 siblings, 2 replies; 7+ messages in thread
From: Акимжанчег @ 2021-01-16 21:49 UTC (permalink / raw)
To: 45922
[-- Attachment #1: Type: text/plain, Size: 21709 bytes --]
Date: Sun, 17 Jan 2021 03:45:31 +0600
Message-ID: <875z3wd090.fsf@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]
Configured using:
'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
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--with-modules --with-cairo --with-harfbuzz 'CFLAGS=-march=x86-64
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LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'
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PDUMPER LCMS2 GMP
Important settings:
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auto-fill-function: yas--auto-fill
global-visual-line-mode: t
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transient-mark-mode: t
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^ permalink raw reply [flat|nested] 7+ messages in thread
* bug#45922: 27.1; Better auto-fill for strings in python-mode
2021-01-16 21:49 bug#45922: 27.1; Better auto-fill for strings in python-mode Акимжанчег
@ 2021-01-17 11:58 ` Tomas Nordin
[not found] ` <CAJBTzO=rE4n4iZdBNv2HE=zi+_O1r=bqwFdsCku1-3VZOgqOWg@mail.gmail.com>
2022-05-07 15:51 ` Lars Ingebrigtsen
1 sibling, 1 reply; 7+ messages in thread
From: Tomas Nordin @ 2021-01-17 11:58 UTC (permalink / raw)
To: Акимжанчег,
45922
Hello Акимжанчег
Акимжанчег <zelenaruta@gmail.com> writes:
> Date: Sun, 17 Jan 2021 03:45:31 +0600
> Message-ID: <875z3wd090.fsf@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
^ permalink raw reply [flat|nested] 7+ messages in thread
* bug#45922: 27.1; Better auto-fill for strings in python-mode
[not found] ` <CAJBTzO=rE4n4iZdBNv2HE=zi+_O1r=bqwFdsCku1-3VZOgqOWg@mail.gmail.com>
@ 2021-01-17 20:18 ` Tomas Nordin
0 siblings, 0 replies; 7+ messages in thread
From: Tomas Nordin @ 2021-01-17 20:18 UTC (permalink / raw)
To: Акимжанчег
Cc: 45922
Акимжанчег <zelenaruta@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.
^ permalink raw reply [flat|nested] 7+ messages in thread
* bug#45922: 27.1; Better auto-fill for strings in python-mode
2021-01-16 21:49 bug#45922: 27.1; Better auto-fill for strings in python-mode Акимжанчег
2021-01-17 11:58 ` Tomas Nordin
@ 2022-05-07 15:51 ` Lars Ingebrigtsen
2022-05-07 16:25 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
1 sibling, 1 reply; 7+ messages in thread
From: Lars Ingebrigtsen @ 2022-05-07 15:51 UTC (permalink / raw)
To: Акимжанчег
Cc: 45922, Stefan Monnier
Акимжанчег <zelenaruta@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
^ permalink raw reply [flat|nested] 7+ messages in thread
* bug#45922: 27.1; Better auto-fill for strings in python-mode
2022-05-07 15:51 ` Lars Ingebrigtsen
@ 2022-05-07 16:25 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-07 16:56 ` Lars Ingebrigtsen
0 siblings, 1 reply; 7+ messages in thread
From: Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2022-05-07 16:25 UTC (permalink / raw)
To: Lars Ingebrigtsen
Cc: Акимжанчег,
45922
> 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
^ permalink raw reply [flat|nested] 7+ messages in thread
* bug#45922: 27.1; Better auto-fill for strings in python-mode
2022-05-07 16:25 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2022-05-07 16:56 ` Lars Ingebrigtsen
2022-05-07 17:28 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 1 reply; 7+ messages in thread
From: Lars Ingebrigtsen @ 2022-05-07 16:56 UTC (permalink / raw)
To: Stefan Monnier
Cc: Акимжанчег,
45922
Stefan Monnier <monnier@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
^ permalink raw reply [flat|nested] 7+ messages in thread
* bug#45922: 27.1; Better auto-fill for strings in python-mode
2022-05-07 16:56 ` Lars Ingebrigtsen
@ 2022-05-07 17:28 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 0 replies; 7+ messages in thread
From: Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2022-05-07 17:28 UTC (permalink / raw)
To: Lars Ingebrigtsen
Cc: Акимжанчег,
45922
> 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
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2022-05-07 17:28 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-16 21:49 bug#45922: 27.1; Better auto-fill for strings in python-mode Акимжанчег
2021-01-17 11:58 ` Tomas Nordin
[not found] ` <CAJBTzO=rE4n4iZdBNv2HE=zi+_O1r=bqwFdsCku1-3VZOgqOWg@mail.gmail.com>
2021-01-17 20:18 ` Tomas Nordin
2022-05-07 15:51 ` Lars Ingebrigtsen
2022-05-07 16:25 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-07 16:56 ` Lars Ingebrigtsen
2022-05-07 17:28 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
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