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use std::io;
use std::path::Path;
use std::process::Command;
use std::str;
use std::str::Utf8Error;
use regex::Regex;
#[derive(Debug, PartialEq)]
pub struct Blob<'a> {
pub object: &'a str,
pub path: &'a Path,
}
pub fn crawl_git_tree<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
let output = Command::new("git")
.current_dir(path)
.args(&["ls-tree", "-zr", "HEAD"])
.output()?;
if !output.status.success() {
return Err(io::Error::new(
io::ErrorKind::Other,
"git ls-tree did not run successfully",
));
}
Ok(output.stdout)
}
pub fn parse_ls_tree_output<'a>(output: &'a [u8]) -> Result<Vec<Blob<'a>>, Utf8Error> {
let re = Regex::new(r"^[^ ]+ [^ ]+ ([^\t]+)\t(.+)$").unwrap();
let mut blobs = Vec::new();
for line in output.split(|&byte| byte == 0) {
let line = str::from_utf8(line)?;
if let Some(captures) = re.captures(line) {
blobs.push(Blob {
object: captures.get(1).unwrap().as_str(),
path: Path::new(captures.get(2).unwrap().as_str()),
})
}
}
Ok(blobs)
}
#[cfg(test)]
mod tests {
use super::*;
use crate::git::{parse_ls_tree_output, Blob};
const TEST_OUTPUT: &[u8] = b"100644 blob 424965736fa85c814e0ecb12d42ec81021304ce9\tREADME.md\0invalid\0100644 blob 5ec8f34bce9b5b53f3d809591914fa1601534a8a src/main.rs\0";
#[test]
fn test_parse_ls_tree_output() {
let expected = vec![
Blob {
object: "424965736fa85c814e0ecb12d42ec81021304ce9",
path: Path::new("README.md"),
},
Blob {
object: "5ec8f34bce9b5b53f3d809591914fa1601534a8a",
path: Path::new("src/main.rs"),
},
];
assert_eq!(parse_ls_tree_output(TEST_OUTPUT).unwrap(), expected);
}
}
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