extern crate git2;
extern crate docopt;
extern crate rustc_serialize;
use docopt::Docopt;
use git2::{Repository, BlameOptions};
use std::path::Path;
use std::io::{BufReader, BufRead};
#[derive(RustcDecodable)] #[allow(non_snake_case)]
struct Args {
arg_path: String,
arg_spec: Option<String>,
flag_M: bool,
flag_C: bool,
flag_F: bool,
}
fn run(args: &Args) -> Result<(), git2::Error> {
let repo = try!(Repository::open("."));
let path = Path::new(&args.arg_path[..]);
let mut opts = BlameOptions::new();
opts.track_copies_same_commit_moves(args.flag_M)
.track_copies_same_commit_copies(args.flag_C)
.first_parent(args.flag_F);
let mut commit_id = "HEAD".to_string();
if let Some(spec) = args.arg_spec.as_ref() {
let revspec = try!(repo.revparse(spec));
let (oldest, newest) = if revspec.mode().contains(git2::REVPARSE_SINGLE) {
(None, revspec.from())
} else if revspec.mode().contains(git2::REVPARSE_RANGE) {
(revspec.from(), revspec.to())
} else {
(None, None)
};
if let Some(commit) = oldest {
opts.oldest_commit(commit.id());
}
if let Some(commit) = newest {
opts.newest_commit(commit.id());
if !commit.id().is_zero() {
commit_id = format!("{}", commit.id())
}
}
}
let spec = format!("{}:{}", commit_id, path.display());
let blame = try!(repo.blame_file(path, Some(&mut opts)));
let object = try!(repo.revparse_single(&spec[..]));
let blob = try!(repo.find_blob(object.id()));
let reader = BufReader::new(blob.content());
for (i, line) in reader.lines().enumerate() {
if let (Ok(line), Some(hunk)) = (line, blame.get_line(i+1)) {
let sig = hunk.final_signature();
println!("{} {} <{}> {}", hunk.final_commit_id(),
String::from_utf8_lossy(sig.name_bytes()),
String::from_utf8_lossy(sig.email_bytes()), line);
}
}
Ok(())
}
fn main() {
const USAGE: &'static str = "
usage: blame [options] [<spec>] <path>
Options:
-M find line moves within and across files
-C find line copies within and across files
-F follow only the first parent commits
";
let args = Docopt::new(USAGE).and_then(|d| d.decode())
.unwrap_or_else(|e| e.exit());
match run(&args) {
Ok(()) => {}
Err(e) => println!("error: {}", e),
}
}