I have generated some code with proc_macro2 and want to format it and write it to a file at a specified path. How should I do this? Inputting the string directly into rustfmt::format_input raises an error.
What error, specifically?
I just forget... Related with the "terminal"? Anyway it was weird.
Piping into stdin should work fine. It's what I've used before to clean up the output from a code generator.
I'm guessing the code you generated had a syntax error, and rustfmt
wasn't able to recover from it.
Finally I just write original tokenstream.to_string()
to the dest file and then assert!(Command::new("rustfmt").arg(&path).status().unwrap().success());
.
The error was failed to emit error: operation not supported by the terminal
. Code below:
fn main() {
let ibuf = something_outputs_tokenstream().to_string();
let mut obuf = Vec::new();
let mut ocur = std::io::Cursor::new(&mut obuf);
let _ = rustfmt::format_input(rustfmt::Input::Text(ibuf), &Default::default(), Some(&mut ocur)).unwrap();
println!("{}", String::from_utf8(obuf).unwrap());
}
Calling the CLI's rustfmt has never presented any problems.
Yeah, rustfmt
is not designed to be a "public" Rust library crate; only a CLI binary.
For machine-generated output,
can be used as a Rust library and generates, in general, less weirdly formatted code (since machine-generated code can get weird, sometimes, and rustfmt
was not made to account for such atypical cases in mind).
Thanks, it works well.
This topic was automatically closed 90 days after the last reply. We invite you to open a new topic if you have further questions or comments.