config.phundrak.com/docs/rustfmt.org

#+TITLE: Rust Formatter
#+setupfile: headers
#+PROPERTY: header-args:toml :mkdirp yes :tangle ~/.rustfmt.toml

* Rust Formatter
The ~.rustfmt.toml~ file located in the ~$HOME~ directory is a global
configuration file for Rust’s code formatters, such as ~rustfmt~. In this file,
you can find how my Rust code is always formatted.

** General settings
First, we are using the 2018 edition of Rust.
#+BEGIN_SRC toml
edition = "2018"
#+END_SRC

Put single-expression functions on a single line.
#+BEGIN_SRC toml
fn_single_line = true
#+END_SRC

Format string literals where necessary.
#+BEGIN_SRC toml
format_strings = true
#+END_SRC

Maximum width of each line
#+BEGIN_SRC toml
max_width = 80
#+END_SRC

Merge multiple imports into a single nested import.
#+BEGIN_SRC toml
merge_imports = true
#+END_SRC

** Structs and Enums
The maximum length of enum variant having discriminant, that gets
vertically aligned with others. Variants without discriminants would
be ignored for the purpose of alignment.

Note that this is not how much whitespace is inserted, but instead the
longest variant name that doesn't get ignored when aligning.
#+BEGIN_SRC toml
enum_discrim_align_threshold = 20
#+END_SRC

The maximum diff of width between struct fields to be aligned with
each other.
#+BEGIN_SRC toml
struct_field_align_threshold = 20
#+END_SRC

Reorder =impl= items. =type= and =const= are put first, then macros and
methods.
#+BEGIN_SRC toml
reorder_impl_items = true
#+END_SRC

** Comments
Convert ~/* */~ comments to ~//~ comments where possible.
#+BEGIN_SRC toml
normalize_comments = true
#+END_SRC

Break comments to fit on the line.
#+BEGIN_SRC toml
wrap_comments = true
#+END_SRC

Report ~FIXME~ items in comments.
#+BEGIN_SRC toml
report_fixme = "Always"
#+END_SRC

Report ~TODO~ items in comments.
#+BEGIN_SRC toml
todo = "Always"
#+END_SRC

** Documentation
Format code snippet included in doc comments.
#+BEGIN_SRC toml
format_code_in_doc_comments = true
#+END_SRC

Convert ~#![doc]~ and ~#[doc]~ attributes to ~//!~ and ~///~ doc comments.
#+BEGIN_SRC toml
normalize_doc_attributes = true
#+END_SRC

** Whitespace
Use tab characters for indentation, spaces for alignment.
#+BEGIN_SRC toml
hard_tabs = false
#+END_SRC

Number of spaces per tab.
#+BEGIN_SRC toml
tab_spaces = 4
#+END_SRC

I want newlines to always be Unix style.
#+BEGIN_SRC toml
newline_style = "Unix"
#+END_SRC