rust-lang / rust-lang/rust-mode

Add rust-format-region function

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help wanted rustfmt
Dominant language
Emacs Lisp
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Forks
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Description

It would be nice if rust-mode allowed formatting only specific lines of a file, analogously to clang-format's clang-format-region.

The necessary support to format only certain parts of a file is already present upstream in rustfmt by using the file_lines command line argument.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by locating rust-mode’s existing rustfmt entry point and compare the requested behavior with clang-format-region. Use rustfmt’s file_lines command-line argument to format only the selected lines, and verify that the new rust-format-region function formats the region without changing unrelated lines.

Written by the indexing model from the issue text.

Assessment

Tech stack
emacs-lisp, rust
Domain
tooling
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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