thirdshift 0.1.0

Turn a GitHub issue into a ready-for-review pull request, unattended
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//! Running `git` in a directory.

use std::path::{Path, PathBuf};
use std::process::{Command, Output};

use anyhow::{Context, Result, bail};

/// `git` bound to a working directory. Output is captured, never passed
/// through, so stdout stays reserved for the PR URL.
pub struct Git {
    dir: PathBuf,
}

impl Git {
    pub fn new(dir: impl Into<PathBuf>) -> Self {
        Git { dir: dir.into() }
    }

    pub fn dir(&self) -> &Path {
        &self.dir
    }

    /// Run `git <args>` and return its trimmed stdout, failing with git's
    /// stderr if it exits non-zero.
    pub fn run(&self, args: &[&str]) -> Result<String> {
        let output = self.output(args)?;
        if !output.status.success() {
            bail!(
                "git {} failed: {}",
                args.join(" "),
                String::from_utf8_lossy(&output.stderr).trim()
            );
        }
        Ok(String::from_utf8_lossy(&output.stdout).trim().to_string())
    }

    /// Run `git <args>` and report whether it exited zero, for commands whose
    /// exit status is the answer.
    pub fn succeeds(&self, args: &[&str]) -> Result<bool> {
        Ok(self.output(args)?.status.success())
    }

    fn output(&self, args: &[&str]) -> Result<Output> {
        Command::new("git")
            .args(args)
            .current_dir(&self.dir)
            .output()
            .with_context(|| format!("could not run git {}", args.join(" ")))
    }
}