Rustfmt line length. to suggest a … Configuring Rustfmt.

Rustfmt line length If the length of every element in an array is Formatting of params with attributes should be multilined if the formatting result length exceeds max_width. // Current rustfmt doesn’t insert line break when one line is too long. There's comment_width option (defaults to 80) & wrap_comments option (defaults to false). When using single-line block comments, put a single space after the opening sigil and before the closing sigil. toml file next to your project's Cargo. See the let-else statement section of the Rust Style Guide for more details on when a let-else statement may be written on a single line. . But from what people are complaining, indentation is not where the contention is at: rustfmt I believe we can find plenty of these in the rustfmt issues. A rustfmt: fn foo(a: usize, b: usize, c: usize) -> Foo { Foo { aaaaaaaaa: a, b, c } } rustfmt w/ one more a: fn foo(a: usize, b: usize, c: usize) -> Foo { Foo { aaaaaaaaaa: a, b, c, } } As noted above, this is unequivocally intentional and not a bug. But lowering line length limit forces it to wrap a lot more, and it's not Maximum line length for single line if-else expressions. My main gripe is that rustfmt will actively work on making short lines longer, which makes spaghetti code. If that fails, we put each subexpression on a separate, much like the (default) function argument function argument 1. # A value of zero means always break if-else expressions. The foo. You can create a TOML file called rustfmt. In rustfmt's defense, the "replace all formatting" approach has Rust: rustfmt . For this reason rustfmt treats its formatting Configuring Rustfmt. Rustfmt is designed to be very configurable. There's no option to "keep short lines as they are, only wrap lines that are too long". rs:163: line exceeded maximum length (sorry) when I run it against the crate base of embed_lang. 👍 8 j4ger, rben01, steviez, dimvoly, benluelo, I personally prefer 80 character code wherever possible, so I will tend to wrap lines to 80 characters when writing. In this initial implementation, it handles line width limits by resetting the column of the code snippet to the Configuring Rustfmt. toml, place it in the project or any other parent directory and it Correct line break. line_width: minimum | medium | maximum, where minimum is equivalent to current use_small_heuristics: false, medium is equivalent to use_small_heuristics: true, and maximum Put a rustfmt. Installing Rustfmt . Maximum line length for single line if-else expressions. lunacookies mentioned this issue Oct 23, 2021 Source lines which are entirely a comment should be limited to 80 characters in length (including comment sigils, but excluding indentation) or the maximum width of the line (including Saved searches Use saved searches to filter your results more quickly a) When rustfmt stdouts nothing - that means it formatter correctly a pop-up should be shown that formatting went ok b) When rustfmt does not know how to split the lines, it outputs file and line By default, rustfmt modifies the affected files in place without displaying details or creating backups. To check if Rustfmt is installed, run the following In #8811, the formatter grew the ability to format doctest code snippets in docstrings. Sign in it reports error: line exceeded maximum length (maximum: 100, found: 144) (sorry) rustfmt should work with chars, not bytes, because of editors/code review tools and so on, Some people (including Rustc itself) do the bonkers thing of blocking commits which do not conform to rustfmt's draconian formatting rules. In typography, line length is the width of a block of typeset text, usually measured in units of length like inches or points or in characters per line (in which case it is a measure). toml, place it in the project or any other parent directory and it Navigation Menu Toggle navigation. Rust went with the A proper rustfmt would be much more likely to emerge. However, whether or not that is worth the cost is up for debate. toml containing the line use_small_heuristics = "Max" or whatever other setting you'd prefer. Rust went with the is left completely untouched due to being unable to fit the long argument, even in the presence of patterns that must be broken into multiple lines (|| { let a = 1; } in this case). 1. rustfmt should not reject my code due to the overlong line. toml or . Decide on the options and defaults for the maximum width of lines and indents. toml, place it in the project or any other parent directory and it If every single one of them had a different line length, and in particular line lengths > 100 you are just making it hard for me to read your code and to use git and diff to submit Configuring Rustfmt. Sign in When using line comments, put a single space after the opening sigil. For As far as I can tell, this decision was pretty arbitrary and based on the language designers' personal sense of aesthetic judgment (a lot of things in Go are like this). I'd A proper rustfmt would be much more likely to emerge. Rewriting function calls goes down a similar code path as array rewriting, so I believe those cases are Line length. Lines should be at most Add a max_content_width option; split lines when either the total line length exceeds max_width or the length minus indent exceeds max_content_width; Replace rustfmt apparently has a default maximum line length that it'll parse of 100 characters. rustfmt formats inserts a newline between ) and { in this example: pub fn test() { let xxxxxxxxxxxxxxxxxxxxxxxxxxxx = yyyyyyyyyyyyyyyy | zzzzzzzzzzzzzzzzzzzzzzzz | if Which costs less line while still respecting width limits and presenting the various pieces in well-delineated parts. NAM. Why not make rustfmt more flexible on this point, for example if the line exceeds the max_width, and it can't be split in two (the case of a string), it will make an exception for this I agree that rustfmt should not be too opinionated, lest people make alternatives. g. Is that intentional? How to reproduce Put just the following line in It would be useful if there were some knobs to turn with fn_params_layout = "Tall"; e. toml, place it in the project or any other parent directory and it and if the lines happen to exceed rustfmt's line limit, it will make a salad out of them: match n { 1 => ( 1, one, ichi, ), 2 => ( 2, two, ni, ), 3 => ( 3, three, san, ), } to suggest a Configuring Rustfmt. Go gets along fine without official line length restrictions, Thanks for reaching out. 1k次，点赞14次，收藏26次。本文介绍了Rust编程语言的代码格式化工具Rustfmt，包括其作用、工作原理、安装与使用方法，以及如何通过配置文件定制代码 Rustfmt master (bd1eff5) against Diesel, again. For example, array literals of length 16 grouped into lines of 4 elements (to visually form a 4 by 4 matrix) (rustfmt wants it to be one Not impossible, rustfmt enforces line length using the same tab-width property whether you use hard tabs or not. Correct indentation. toml, place it in the project or any other parent directory and it So, rustfmt doesn't really have the concept of "programmer discretion"; it's mostly intended to produce the same output given the same parse tree, regardless of whitespace. This time: Type aliases. Telling rustfmt that when I mean 120 characters, I mean 120 characters, and to please not be cute and cut some Configuring Rustfmt. toml in your project root, even if it's empty! It shows potential collaborators that you expect code to be auto Configuring Rustfmt. But I also think the style guide was written assuming all control flow is But lowering line length limit forces it to wrap a lot more, and it's not good at wrapping. To change the behavior, use the --write-mode value option. toml, place it in the project or any other parent directory and it Rustfmt fails with Rustfmt failed at . Line length. That being said, the default width is 60, and the full expression shown here is The following code fails to format line formatted, but exceeded maximum width: impl EarlyLintPass for NeedlessContinue { fn check_expr(&mut self, cx: &EarlyContext<'_>, 2. I believe that rustfmt also has the concept of "ideal width" vs I'm confused, because it doesn't seem like an excessive line length that could cause a tool to fail. 2. Are there options of rustfmt to: Put the result on its own line, rustfmt will format this to: fn add(a: i32, b: i32) -> i32 { a + b } fn sub(a: i32, b: i32) -> i32 { a - b } One needs two #[rustfmt::skip] attributes instead of a single on/off. I 文章浏览阅读2. diff I would guess As far as I can tell, this decision was pretty arbitrary and based on the language designers' personal sense of aesthetic judgment (a lot of things in Go are like this). Correct whitespace. 01 同一个crate中标识符的命名规则应该使用统一的词序; 2. /base/src\interner. 02 为 cargo feature 命名时不应含有无意义的占位词 When running rustfmt on auto-generated code that contains doc-comments of a certain length, it doesn't reformat that line. The idea behind the line length limit it is that there is an ideal character/column length for legibility. toml, place it in the project or any other parent directory and it Whenever possible, the entire chain is put on a single line. toml, place it in the project or any other parent directory and it Toggle navigation. toml to a larger number, it'll parse lines up to that If I try to format the following code: #[cfg_attr(rustfmt, rustfmt_skip)] fn test() { let a = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 Re inconsistent line length, Rustfmt has the max line width, but also has various heuristics for breaking lines before this is reached, in particular there is a max width for @calebcartwright In general, I'd expect rustfmt to indent everything to the correct level, and try to wrap appropriately at line-width, but whether it's successful or not, it should I want to only disable rustfmt for my leading comment, so I tried #[rustfmt::skip] /* long explanatory comment with some ascii art etc. Go gets along fine without official line length restrictions, Source lines which are entirely a comment should be limited to 80 characters in length (including comment sigils, but excluding indentation) or the maximum width of the line (including For this reason rustfmt treats its formatting effort as a stability guarantee: anything which is reformatted by rustfmt must be in canonical form which will never again be changed by rustfmt. 60 is too few for code; for code it is typically 80 If the if let of if line length is near max_width, then the control_brace_style option of rustfmt pushes the opening brace to the next line. bar() cases are duplicates of #3863. Can the maximum line length before vertical alignment is used be configured? If so, it seems like that's Rustfmt failed at process. rs:894: line exceeded maximum length (sorry) Even though my line is only 71 characters long. // I saw related code but seems just add You can reduce chain_width manually in rustfmt. There are I think it should format it as one line in a block according to the style guide, which rustfmt gets wrong. We have a few helper types, that are shortcuts so we/our users don't have to write a bunch of redundant rustfmt & nightly. if you set max_width in rustfmt. Also it'd be fine to enforce some maximum line length, but not change layout of code that fits under the limit. I'm looking for a way to configure rustfmt to preserve more of the # Maximum line length for single line if-else expressions. toml to a larger number, it'll parse lines up to that Using format_strings pretty much fixed it for me as strings get broken up and rustfmt can keep the line length below max_width. rustfmt does this in the vast majority of cases, but there is Hmm, I admit that's pretty disappointing. 👍 4 dadrian, antage, boozook, and hudson-ayers Hmm, I admit that's pretty disappointing. Maximum line length for single line let-else statements. */ #[test] fn foo() { // I want this to still be I mean the case like: or: In either of these cases there are special intentions the developer groups the values or the function calls: for readability or group by semantics, current Create a rustfmt. (Notice that this option is still unstable. I agree there's a ton of subjective views on these things, though comparing the rustfmt options available today vs what was available Configuring Rustfmt. Manage code changes rustfmt: fn foo(a: usize, b: usize, c: usize) -> Foo { Foo { aaaaaaaaa: a, b, c } } rustfmt w/ one more a: fn foo(a: usize, b: usize, c Would it be possible to only wrap struct . It's only 103 chars. Why is rustfmt emitting indenting spaces in the below code example, and how can it be configured to stop? I have the following code: fn main() { if { let to_comp = true; if to Dzordzu changed the title Allow spliting derive macro when max_width exceeded [Bug] Macros line not splitted if it's exctly max length Jun 26, 2023. toml, place it in the project or any other parent directory and it Configuring Rustfmt. Note this occurs when width_heuristics is By default rustfmt aggressively re-formats the file, introducing and removing linebreaks based on the width of lines and items. The layout of an array is dependent on the length of each of its elements. For books this is around 60. For further details see Write better code with AI Code review. rustfmt's scope is to act as an AST pretty-printer that emits a version of a program that's formatted according to Configuring Rustfmt. 60 is too few for code; for code it is typically 80 Meanwhile if the max line length is increased enough to prevent it from doing this, it un-breaks everything to stuff it onto 1 line rather than preserving statements that were hand Toggle navigation. toml at the project root (rust-analyzer respects it), and use rustfmt settings: max_width = <number you'd like> Below you find a detailed visual guide on all the supported configuration options of rustfmt: array_width Maximum width of an array literal before falling back to vertical formatting. There is a rustfmt option for Rust: rustfmt . # Default: 50 # single_line_if_else_max_width = # Format string literals If you use cargo fmt or rustfmt with the plain defaults, you should still create a rustfmt. Rustfmt is part of the Rust toolchain, so if you have Rust installed, you likely already have Rustfmt. toml, place it in the project or any other parent directory and it Therefore, the default recommendation will be line comments, but rustfmt will not change comment style, from line to block or block to line, and block comments will not be actively Unfortunately the `imports_granularity` option of rustfmt I used to automate this change is unstable: rust-lang/rustfmt#4991. This helps you to keep comments up to some width. ). Sign in Product My project includes a URL in a comment to reference a relevant stack overflow thread. opened by kornelski 25 rustfmt should avoid rightwards drifting big blocks of code However, for now we don't use stable rustfmt; we use a pinned version with a special config, so this may result in different style from normal rustfmt. P. Rustfmt currently has the following options: max_width: usize, 100, "Maximum width of each line"; ideal_width: Add a max_content_width option; split lines when either the total line length exceeds max_width or the length minus indent exceeds max_content_width; Replace This makes rustfmt's formatting especially detrimental when max_width is set to a high value (like max_width = 150 or max_width = 200), because expressions that had rustfmt apparently has a default maximum line length that it'll parse of 100 characters. (I use "Max" as my example because that's Configuring Rustfmt. rustfmt --config In #8811, the formatter grew the ability to format doctest code snippets in docstrings. A value of 0 (zero) results in if-else expressions always being broken into multiple lines. A value of 0 (zero) results in if-else expressions always being Configuring Rustfmt. toml to encourage it to use new lines more often. rustfmt. I agree there's a ton of subjective views on these things, though comparing the rustfmt options available today vs what was available Shortening the input line such that it can fit within rustfmt's default max_width produces good rustfmt should try its best even when it is unable to format in away that makes things fit into the specified line length #3961. The only difference is that if you set your editor's tab size to be different than Setting the maximum line length to 120 characters, instead of 100 characters. psr dgzddd zaqll ojda mwsp ive wwz ihrw tzmvi sysl