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

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

proc _update_alternatives
{
    local cur prev words cword
    _init_completion || return

    match $prev {
        with --altdir|--admindir
            _filedir -d
            return 0
            
        with --help|--usage|--version
            return 0
            
    }

    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

    match $mode {
        with --install
            match $args {
                with 1|3
                    _filedir
                    
                with 2
                    _installed_alternatives
                    
                with 4
                    # priority - no completions
                    
                with *
                    match $shExpr('args % 4') {
                        with 0|2
                            _filedir
                            
                        with 1
                            setglobal COMPREPLY = ''( $( compgen -W '--slave' -- "$cur" ) )
                            
                        with 3
                            _installed_alternatives
                            
                    }
            }
            
        with --remove|--set
            match $args {
                with 1
                    _installed_alternatives
                    
                with 2
                    _filedir
                    
            }
            
        with --auto|--remove-all|--display|--config
            _installed_alternatives
            
        with *
            setglobal COMPREPLY = ''( $( compgen -W '--verbose --quiet --help --version
                --altdir --admindir --install --remove --auto --display
                --config --set' -- "$cur" ) )
    }
} &&
complete -F _update_alternatives update-alternatives alternatives

# ex: ts=4 sw=4 et filetype=sh