git-co 0.3.1

A command-line tool for simplified git branch checkout.
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use clap::Parser;
use git2::{BranchType, Repository};
use skim::prelude::*;
use std::path::PathBuf;
use std::process::{Command, Stdio};
use tuikit::prelude::*;

#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None)]
struct Args {
    /// Show only remote branches
    #[clap(short = 'r', long)]
    remote_only: bool,

    /// Show only local branches
    #[clap(short = 'l', long)]
    local_only: bool,
}

#[derive(Clone, Debug)]
struct Branch {
    name: String,
}

impl SkimItem for Branch {
    fn text(&self) -> Cow<str> {
        Cow::Borrowed(&self.name)
    }
}

fn find_git_root() -> Option<PathBuf> {
    let current_dir = std::env::current_dir().ok()?;
    let repo = match Repository::discover(&current_dir) {
        Ok(repo) => repo,
        Err(_) => return None,
    };

    let git_dir = repo.path().parent()?.to_path_buf();
    Some(git_dir)
}

fn get_current_branch(repo: &Repository) -> Branch {
    let head = match repo.head() {
        Ok(head) => head,
        Err(e) => panic!("Failed to get HEAD: {}", e),
    };

    let branch = match head.shorthand() {
        Some(branch) => branch,
        None => panic!("Failed to get branch name"),
    };

    Branch {
        name: branch.to_string(),
    }
}

fn get_branches(repo: &Repository, branch_filter: Option<BranchType>) -> Vec<Branch> {
    let branches = match repo.branches(branch_filter) {
        Ok(branches) => branches,
        Err(e) => panic!("Failed to get branch iterator: {}", e),
    };

    branches
        .map(|branch| {
            let branch = match branch {
                Ok((branch, _)) => branch,
                Err(e) => panic!("Failed to get branch: {}", e),
            };

            match branch.name() {
                Ok(Some(name)) => Branch {
                    name: name.to_string(),
                },
                Ok(None) => panic!("Failed to get branch name: Empty name"),
                Err(e) => panic!("Failed to get branch name: {}", e),
            }
        })
        .collect()
}

fn checkout(branch_name: String) {
    Command::new("git")
        .args(&["checkout", branch_name.as_str()])
        .stdout(Stdio::inherit())
        .stderr(Stdio::inherit())
        .output()
        .expect("Failed to execute command");
}

fn main() {
    let args = Args::parse();

    let branch_filter;
    if args.remote_only && args.local_only {
        panic!("Cannot specify both --remote-only and --local-only");
    } else if args.remote_only {
        branch_filter = Some(BranchType::Remote);
    } else if args.local_only {
        branch_filter = Some(BranchType::Local);
    } else {
        branch_filter = None;
    }

    let git_root = match find_git_root() {
        Some(git_root) => git_root,
        None => panic!("Failed to find git root"),
    };

    let repo = match Repository::open(git_root) {
        Ok(repo) => repo,
        Err(e) => panic!("Failed to open repository: {}", e),
    };

    let (tx, rx): (SkimItemSender, SkimItemReceiver) = unbounded();

    let current_branch = get_current_branch(&repo);
    if !args.remote_only {
        let _ = tx.send(Arc::new(current_branch.name.clone()));
    }

    get_branches(&repo, branch_filter)
        .iter()
        .filter(|branch| branch.name != current_branch.name)
        .for_each(|branch| {
            let _ = tx.send(Arc::new(branch.clone()));
        });

    drop(tx);

    let options = SkimOptionsBuilder::default().build().unwrap();
    Skim::run_with(&options, Some(rx)).map(|out| match out.final_key {
        Key::Enter | Key::DoubleClick(MouseButton::Left, _, _) => {
            let selected_branch_name = out
                .selected_items
                .first()
                .expect("Failed to get selected item")
                .output()
                .to_string();

            checkout(selected_branch_name);
        }
        _ => (),
    });
}