rem_utils/
formatter.rs

1use std::{
2    io::Write,
3    process::{Command, Stdio},
4};
5
6use crate::error::Error;
7
8/// Formats a rust source string using rustfmt.
9pub fn format_source(src: &str) -> Result<String, Error> {
10    let rustfmt = {
11        let mut proc = Command::new(&"rustfmt")
12            .stdin(Stdio::piped())
13            .stdout(Stdio::piped())
14            .spawn()?;
15        let mut stdin = proc.stdin.take().unwrap();
16        stdin.write_all(src.as_bytes())?;
17        proc
18    };
19
20    let stdout = rustfmt.wait_with_output()?;
21
22    let src = String::from_utf8(stdout.stdout)?;
23
24    Ok(src)
25}
26
27#[cfg(test)]
28mod tests {
29    use super::*;
30
31    #[test]
32    fn test_format_source_works() {
33        let src = format_source("pub fn add1(x : i32) { x + 1}").unwrap();
34
35        assert!(!src.is_empty());
36    }
37}
rem_utils/formatter.rs

rem_utils/
formatter.rs
