pijul 0.7.2

A patch-based distributed version control system, easy to use and fast. Command-line interface.
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use clap::{SubCommand, ArgMatches, Arg};

use super::{BasicOptions, StaticSubcommand, set_current_branch, get_current_branch, default_explain};
use error::{ErrorKind, Result};
use libpijul::patch::UnsignedPatch;
use rand;

pub fn invocation() -> StaticSubcommand {
    return SubCommand::with_name("checkout")
        .about("Change the current branch")
        .arg(Arg::with_name("repository")
             .long("repository")
             .help("Local repository.")
             .takes_value(true)
        )
        .arg(Arg::with_name("branch")
             .help("Branch to switch to.")
             .takes_value(true)
        )
}

pub fn run(args: &ArgMatches) -> Result<()> {
    let opts = BasicOptions::from_args(args)?;
    if let Some(branch) = args.value_of("branch") {
        let repo = opts.open_repo()?;
        let mut txn = try!(repo.mut_txn_begin(rand::thread_rng()));
        if txn.get_branch(branch).is_some() {

            txn.output_repository(&branch, &opts.repo_root,
                                  &UnsignedPatch::empty().leave_unsigned(), &Vec::new())?;
            txn.commit()?;

            set_current_branch(&opts.repo_root, branch)?;

            Ok(())

        } else {
            Err(ErrorKind::NoSuchBranch.into())
        }
    } else {
        println!("Current branch: {:?}", get_current_branch(&opts.repo_root)?);
        Ok(())
    }
}

pub fn explain(res: Result<()>) {
    default_explain(res)
}