# mr completion                                            -*- shell-script -*-

_mr()
{
    local cur prev words cword
    _init_completion || return

    local help commands options

    help="$(PERLDOC_PAGER=cat PERLDOC=-otext "${1}" help 2>/dev/null)"

    commands="$(
        printf %s "$help" | while read -r _ options cmd _; do
            [[ $options != "[options]" ]] || printf "%s\n" "$cmd"
        done
    )"
    # Split [online|offline] and remove `action` placeholder.
    commands="${commands//@(action|[\[\|\]])/$'\n'}"
    # Add standard aliases.
    commands="${commands} ci co ls"

    # Determine if user has entered an `mr` command. Used to block top-level
    # (option and command) completions.
    local cmd i
    for ((i = 1; i < ${#words[@]} - 1; i++)); do
        if [[ $commands == *"${words[i]}"* ]]; then
            cmd="${words[i]}"
            break
        fi
    done

    # Complete options for specific commands.
    if [[ -v cmd ]]; then
        case $cmd in
            bootstrap)
                _filedir
                # Also complete stdin (-) as a potential bootstrap source.
                if [[ -z ${cur} || $cur == - ]] && [[ $prev != - ]]; then
                    COMPREPLY+=(-)
                fi
                return
                ;;
            clean)
                if [[ ${cur} == -* ]]; then
                    COMPREPLY=($(compgen -W '-f' -- "${cur}"))
                fi
                return
                ;;
            commit | ci | record)
                if [[ ${cur} == -* ]]; then
                    COMPREPLY=($(compgen -W '-m' -- "${cur}"))
                fi
                return
                ;;
            run)
                COMPREPLY=($(compgen -c -- "${cur}"))
                return
                ;;
            *)
                # Do not complete any other command.
                return
                ;;
        esac
    fi

    # Complete top-level options and commands.
    case $prev in
        --config | -!(-*)c)
            _filedir
            return
            ;;
        --directory | -!(-*)d)
            _filedir -d
            return
            ;;
    esac

    if [[ $cur == -* ]]; then
        options="$(printf '%s\n' "$help" | _parse_help -)"
        # Remove short options (all have compatible long options).
        options="${options//-[a-z]$'\n'/}"
        # Remove deprecated options.
        options="${options//--path/}"
        COMPREPLY=($(compgen -W "${options}" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "${commands}" -- "${cur}"))
    fi
} &&
    complete -F _mr mr

# ex: filetype=sh