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runtime(rust): use textwidth=100 for the Rust recommended style

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The help text here said 99 was the recommended style for the standard
library, but I can't find a citation for this anywhere. In contrast the
Rust Style Guide hosted on rust-lang.org
[says](https://doc.rust-lang.org/stable/style-guide/#indentation-and-line-width)
the maximum line width is 100, and rustfmt
[agrees](37aa2135b5/src/tools/rustfmt/src/config/options.rs (L570)).

Having the two disagree causes an annoying off-by-one error in vim: if
you configure vim to highlight too-long lines then it will occasionally
complain about a line that rustfmt refuses to fix.

closes: #18892

Signed-off-by: Aaron Jacobs <jacobsa@google.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Aaron Jacobs
2025-12-09 12:43:39 +01:00
committed by Christian Brabandt
parent b22c145c22
commit 98ef8433b6
2 changed files with 4 additions and 3 deletions
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4
runtime/doc/ft_rust.txt
View File

@ -60,8 +60,8 @@ g:rust_conceal_pub~
*g:rust_recommended_style*
g:rust_recommended_style~
Set this option to enable vim indentation and textwidth settings to
conform to style conventions of the rust standard library (i.e. use 4
spaces for indents and sets 'textwidth' to 99). This option is enabled
conform to style conventions of the Rust style guide (i.e. use 4
spaces for indents and set 'textwidth' to 100). This option is enabled
by default. To disable it: >
let g:rust_recommended_style = 0
<

3
runtime/ftplugin/rust.vim
View File

@ -3,6 +3,7 @@
" Maintainer: Chris Morgan <me@chrismorgan.info>
" Last Change: 2024 Mar 17
" 2024 May 23 by Riley Bruins <ribru17@gmail.com ('commentstring')
" 2025 Dec 09 update 'textwidth# to 100 #18892
" For bugs, patches and license go to https://github.com/rust-lang/rust.vim
if exists("b:did_ftplugin")
@ -49,7 +50,7 @@ setlocal smartindent nocindent
if get(g:, 'rust_recommended_style', 1)
let b:rust_set_style = 1
setlocal shiftwidth=4 softtabstop=4 expandtab
setlocal textwidth=99
setlocal textwidth=100
endif
setlocal include=\\v^\\s*(pub\\s+)?use\\s+\\zs(\\f\|:)+