rustfmt-repl

A tiny adapter that lets rustfmt format Rust statement snippets used in Markdown code blocks and REPLs.

It first runs rustfmt on the input as a complete Rust source file. If that fails, it temporarily wraps the input in fn main(), formats it, and removes the wrapper again.

Build

cargo install rustfmt-repl

Usage

Read from stdin and write to stdout:

'let x=(1,2); dbg!(x,    x.0);' | rustfmt-repl

Or format a file in place:

rustfmt-repl path\to\snippet.rs

mdsf

{
  "languages": {
    "rust": {
      "binary": "rustfmt-repl",
      "arguments": ["$PATH"],
      "stdin": false
    }
  }
}

Make sure Cargo's binary directory is available on PATH. Its usual location is $HOME/.cargo/bin on Unix-like systems and %USERPROFILE%\.cargo\bin on Windows. If the editor does not inherit your shell environment, use the full path to the executable in your local configuration.