#!/usr/bin/env dash

# shellcheck source=/dev/null
SHELL_LIBRARY_VERSION="2.1.2" . %SHELL_LIBRARY_PATH

help() {
    cat << EOF
Automatically remove merged branches (remote and local)

USAGE:
    git-cleanup [OPTIONS]

OPTIONS:
    --remote    | -r
                            Act on remote branches

    --help      | -h
                            Display this help and exit.

    --version   | -v
                            Display version and copyright information and exit.
EOF
}

# This should always be the correct answer.
get_default_branch() {
    # source: https://stackoverflow.com/a/50056710
    # We assume, that 'origin' is the remote in use
    git remote show origin | sed -n '/HEAD branch/s|.*: ||p'
}

cleanup() {
    default_branch="$(get_default_branch)";

    merged_branches="$(git branch --merged "$default_branch" --no-contains "$default_branch" --format='%(refname:short)')";

    [ "$merged_branches" ] && git branch --delete "$merged_branches"
}
cleanup_remote() {
    default_branch="$(get_default_branch)";

    merged_branches="$(git branch --remotes --merged "$default_branch" --no-contains "$default_branch" --format='%(refname:short)' | sed 's|origin/||')";

    [ "$merged_branches" ] && git push --delete origin "$merged_branches"
}



remote=false;
for arg in "$@"; do
    case "$arg" in
        "--help" | "-h")
            help;
            exit 0;
            ;;
       "--version" | "-v")
            version;
            exit 0;
            ;;
        "--remote" | "-r")
            remote=true;
            ;;
    esac
done




if [ "$remote" = "true" ]; then
    cleanup_remote;
elif [ "$remote" = "false" ]; then
    cleanup;
else
    die "BUG: 'remote' is not true or false but: '$remote'";
fi

# vim: ft=sh