config.phundrak.com/org/config/rustfmt.org

#+TITLE: Rust format config
#+setupfile: headers
#+OPTIONS: auto-id:t
#+HTML_HEAD_EXTRA: <meta name="description" content="Phundrak's Rust format config" />
#+HTML_HEAD_EXTRA: <meta property="og:title" content="Phundrak's Rust format config" />
#+HTML_HEAD_EXTRA: <meta property="og:description" content="Description of the Rust format config file of Phundrak" />
#+PROPERTY: header-args:toml :mkdirp yes :tangle ~/.rustfmt.toml

* Introduction
:PROPERTIES:
:CUSTOM_ID: Introduction-465e99fe
:END:
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
:PROPERTIES:
:CUSTOM_ID: General_settings-7f5cb2f6
:END:
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
:PROPERTIES:
:CUSTOM_ID: Structs_and_Enums-6a2a856d
:END:
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
:PROPERTIES:
:CUSTOM_ID: Comments-b1904bb0
:END:
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
:PROPERTIES:
:CUSTOM_ID: Documentation-0c7981c7
:END:
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
:PROPERTIES:
:CUSTOM_ID: Whitespace-e8792b44
:END:
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