rust/crates/tools/src/bin/pre-commit.rs

use std::process::Command;

use failure::bail;

use tools::{Result, run_rustfmt, run, project_root};

fn main() -> tools::Result<()> {
    run_rustfmt(tools::Overwrite)?;
    update_staged()
}

fn update_staged() -> Result<()> {
    let root = project_root();
    let output = Command::new("git")
        .arg("diff")
        .arg("--diff-filter=MAR")
        .arg("--name-only")
        .arg("--cached")
        .current_dir(&root)
        .output()?;
    if !output.status.success() {
        bail!("`git diff --diff-filter=MAR --name-only --cached` exited with {}", output.status);
    }
    for line in String::from_utf8(output.stdout)?.lines() {
        run(&format!("git update-index --add {}", root.join(line).to_string_lossy()), ".")?;
    }
    Ok(())
}