37 lines
1.1 KiB
Rust
37 lines
1.1 KiB
Rust
use std::io::{self, Write};
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use std::process::{Command, Stdio};
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/// Format block expression using `rustfmt` command
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pub fn rustfmt_block(source: &str) -> io::Result<String> {
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let mut new_source = String::with_capacity(source.len() + 11);
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new_source.push_str("fn render()");
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new_source.push_str(source);
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let mut child = Command::new("rustfmt")
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.args(&["--emit", "stdout", "--color", "never", "--quiet"])
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.stdin(Stdio::piped())
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.stdout(Stdio::piped())
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.stderr(Stdio::null())
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.spawn()?;
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let stdin = child
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.stdin
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.as_mut()
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.ok_or_else(|| io::Error::from(io::ErrorKind::BrokenPipe))?;
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stdin.write_all(new_source.as_bytes())?;
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let output = child.wait_with_output()?;
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if output.status.success() {
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let mut s = unsafe { String::from_utf8_unchecked(output.stdout) };
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let brace_offset = s.find('{').unwrap();
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s.replace_range(..brace_offset, "");
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Ok(s)
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} else {
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Err(io::Error::new(
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io::ErrorKind::Other,
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"rustfmt command failed",
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))
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}
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}
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