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/*
* libgit2 "rev-parse" example - shows how to parse revspecs
*
* Written by the libgit2 contributors
*
* To the extent possible under law, the author(s) have dedicated all copyright
* and related and neighboring rights to this software to the public domain
* worldwide. This software is distributed without any warranty.
*
* You should have received a copy of the CC0 Public Domain Dedication along
* with this software. If not, see
* <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#![deny(warnings)]
use git2::Repository;
use structopt::StructOpt;
#[derive(StructOpt)]
struct Args {
#[structopt(name = "spec")]
arg_spec: String,
#[structopt(name = "dir", long = "git-dir")]
/// directory of the git repository to check
flag_git_dir: Option<String>,
}
fn run(args: &Args) -> Result<(), git2::Error> {
let path = args.flag_git_dir.as_ref().map(|s| &s[..]).unwrap_or(".");
let repo = Repository::open(path)?;
let revspec = repo.revparse(&args.arg_spec)?;
if revspec.mode().contains(git2::RevparseMode::SINGLE) {
println!("{}", revspec.from().unwrap().id());
} else if revspec.mode().contains(git2::RevparseMode::RANGE) {
let to = revspec.to().unwrap();
let from = revspec.from().unwrap();
println!("{}", to.id());
if revspec.mode().contains(git2::RevparseMode::MERGE_BASE) {
let base = repo.merge_base(from.id(), to.id())?;
println!("{}", base);
}
println!("^{}", from.id());
} else {
return Err(git2::Error::from_str("invalid results from revparse"));
}
Ok(())
}
fn main() {
let args = Args::from_args();
match run(&args) {
Ok(()) => {}
Err(e) => println!("error: {}", e),
}
}
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