# bash completion for update-alternatives                  -*- shell-script -*-

_installed_alternatives()
{
    local admindir
    # find the admin dir
    for i in alternatives dpkg/alternatives rpm/alternatives; do
        [[ -d /var/lib/$i ]] && admindir=/var/lib/$i && break
    done
    for ((i = 1; i < cword; i++)); do
        if [[ ${words[i]} == --admindir ]]; then
            admindir=${words[i + 1]}
            break
        fi
    done
    COMPREPLY=($(compgen -W '$(command ls $admindir)' -- "$cur"))
}

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

    case $prev in
        --altdir | --admindir)
            _filedir -d
            return
            ;;
        --help | --usage | --version)
            return
            ;;
    esac

    local mode args i

    # find which mode to use and how many real args used so far
    for ((i = 1; i < cword; i++)); do
        if [[ ${words[i]} == --@(install|remove|auto|display|config|remove-all|set) ]]; then
            mode=${words[i]}
            args=$((cword - i))
            break
        fi
    done

    case ${mode-} in
        --install)
            case $args in
                1 | 3)
                    _filedir
                    ;;
                2)
                    _installed_alternatives
                    ;;
                4)
                    # priority - no completions
                    ;;
                *)
                    case $((args % 4)) in
                        0 | 2)
                            _filedir
                            ;;
                        1)
                            COMPREPLY=($(compgen -W '--slave' -- "$cur"))
                            ;;
                        3)
                            _installed_alternatives
                            ;;
                    esac
                    ;;
            esac
            ;;
        --remove | --set)
            case $args in
                1)
                    _installed_alternatives
                    ;;
                2)
                    _filedir
                    ;;
            esac
            ;;
        --auto | --remove-all | --display | --config)
            _installed_alternatives
            ;;
        *)
            COMPREPLY=($(compgen -W '$(_parse_help "$1")' -- "$cur"))
            ;;
    esac
} &&
    complete -F _update_alternatives update-alternatives alternatives

# ex: filetype=sh