# shellcheck shell=bash
#
# Bash commandline completion
#
_module_comgen_words_and_files() {
    local k=0
    local setnospace=1
    # do not append space to word completed if it is a directory (ends with /)
    for val in $(compgen -W "$1" -- "$2"); do
        if [ $setnospace -eq 1 ] && [ "${val: -1:1}" = '/' ]; then
            # Bash >=4.0 is required for compopt
            type compopt &>/dev/null && compopt -o nospace
            setnospace=0
        fi
        COMPREPLY[k++]="$val"
    done
}

_module_avail() {
    local cur="${1:-}"
    # skip avail call if word currently being completed is an option keyword
    if [ -z "$cur" ] || [ "${cur:0:1}" != '-' ]; then
        module avail --color=never -s -t -S --no-indepth -o '' "$cur" 2>&1
    fi
}

_module_savelist() {
    module savelist --color=never -s -t 2>&1 | sed '
        /No named collection\.$/d;
        /Named collection list$/d;
        /:$/d;'
}

_module_stashlist() {
    module stashlist --color=never -s -t 2>&1 | sed '
        /No stash collection\.$/d;
        /Stash collection list$/d;
        /:$/d;'
}

_module_not_yet_loaded() {
    _module_avail "${1:-}" | sort | @SED_ERE@ "\%^(${LOADEDMODULES//:/|})$%d"
}

_module_long_arg_list() {
    local cur="$1" i

    if [[ ${COMP_WORDS[COMP_CWORD-2]} == sw* ]]
    then
        _module_comgen_words_and_files "$(_module_not_yet_loaded "$cur")" "$cur"
        return
    fi
    for ((i = COMP_CWORD - 1; i > 0; i--))
        do case ${COMP_WORDS[$i]} in
        add|load)
            _module_comgen_words_and_files "$(_module_not_yet_loaded "$cur")" "$cur"
            break;;
        rm|del|remove|unload|switch|swap)
            COMPREPLY=( $(IFS=: compgen -W "${LOADEDMODULES}" -- "$cur") )
            break;;
        esac
    done
}

_module() {
    local cur="$2" prev="$3" cmds opts

    COMPREPLY=()

    case "$prev" in
    add|add-any|load|load-any|try-add|try-load)
                    _module_comgen_words_and_files "@comp_load_opts@ $(_module_not_yet_loaded "$cur")" "$cur";;
    avail)          _module_comgen_words_and_files "@comp_avail_opts@ $(_module_avail "$cur")" "$cur";;
    edit)           _module_comgen_words_and_files "$(_module_avail "$cur")" "$cur";;
    aliases)  COMPREPLY=( $(compgen -W "@comp_aliases_opts@" -- "$cur") );;
    list|savelist)  COMPREPLY=( $(compgen -W "@comp_list_opts@" -- "$cur") );;
    stashlist)  COMPREPLY=( $(compgen -W "@comp_stashlist_opts@" -- "$cur") );;
    stashpop|stashshow|stashrm)
                    COMPREPLY=( $(compgen -W "$(_module_stashlist)" -- "$cur") );;
    clear)  COMPREPLY=( $(compgen -W "@comp_clear_opts@" -- "$cur") );;
    restore|save|saveshow|saverm|is-saved)
                    COMPREPLY=( $(compgen -W "$(_module_savelist)" -- "$cur") );;
    rm|del|remove|unload)
                    COMPREPLY=( $(compgen -W "@comp_unload_opts@ ${LOADEDMODULES//:/ }" -- "$cur") );;
    switch|swap)    COMPREPLY=( $(compgen -W "@comp_load_opts@ ${LOADEDMODULES//:/ }" -- "$cur") );;
    unuse|is-used)  COMPREPLY=( $(IFS=: compgen -W "${MODULEPATH}" -- "$cur") );;
    use|-a|--append|cachebuild)   ;;               # let readline handle the completion
    display|help|show|test|path|paths|is-loaded|info-loaded)
                    _module_comgen_words_and_files "@comp_mfile_opts@ $(_module_avail "$cur")" "$cur";;
    is-avail)
                    _module_comgen_words_and_files "@comp_isavail_opts@ $(_module_avail "$cur")" "$cur";;
    lint)
                    _module_comgen_words_and_files "@comp_lint_opts@ $(_module_avail "$cur")" "$cur";;
    mod-to-sh)
                    _module_comgen_words_and_files "@comp_modtosh_opts@ $(_module_not_yet_loaded "$cur")" "$cur";;
    whatis)
                    _module_comgen_words_and_files "@comp_whatis_opts@ $(_module_avail "$cur")" "$cur";;
    apropos|keyword|search)
                    COMPREPLY=( $(compgen -W "@comp_search_opts@" -- "$cur") );;
    config|--reset) COMPREPLY=( $(compgen -W "@comp_config_opts@" -- "$cur") );;
    -h|--help|-V|--version|purge|refresh|reload|sh-to-mod|source|state|reset|stash|stashclear|cacheclear)
                    ;;
    append-path|prepend-path)
                    COMPREPLY=( $(compgen -W "@comp_path_opts@" -- "$cur") );;
    remove-path)
                    COMPREPLY=( $(compgen -W "@comp_rm_path_opts@" -- "$cur") );;
    initadd|initclear|initlist|initprepend|initrm)
                    ;;
    *)  if test "$COMP_CWORD" -gt 2
        then
            _module_long_arg_list "$cur"
        else
            case "$cur" in
            # The mappings below are optional abbreviations for convenience
            ls)     COMPREPLY=( "list" );;      # map ls -> list
            sw*)    COMPREPLY=( "switch" );;

            -*)     COMPREPLY=( $(compgen -W "@comp_opts@" -- "$cur") );;
            *)      COMPREPLY=( $(compgen -W "@comp_opts@ @comp_cmds@" -- "$cur") );;
            esac
        fi;;
    esac
}

# define completion for ml command if command exists
if $(type -t ml >/dev/null); then
    _ml() {
        local cur="$2" prev="$3" cmds opts

        COMPREPLY=()

        case "$prev" in
        add|add-any|load|load-any|try-add|try-load)
                        _module_comgen_words_and_files "@comp_load_opts@ $(_module_not_yet_loaded "$cur")" "$cur";;
        avail)          _module_comgen_words_and_files "@comp_avail_opts@ $(_module_avail "$cur")" "$cur";;
        edit)           _module_comgen_words_and_files "$(_module_avail "$cur")" "$cur";;
        aliases)  COMPREPLY=( $(compgen -W "@comp_aliases_opts@" -- "$cur") );;
        list|savelist)  COMPREPLY=( $(compgen -W "@comp_list_opts@" -- "$cur") );;
        stashlist)  COMPREPLY=( $(compgen -W "@comp_stashlist_opts@" -- "$cur") );;
        stashpop|stashshow|stashrm)
                    COMPREPLY=( $(compgen -W "$(_module_stashlist)" -- "$cur") );;
        clear)  COMPREPLY=( $(compgen -W "@comp_clear_opts@" -- "$cur") );;
        restore|save|saveshow|saverm|is-saved)
                        COMPREPLY=( $(compgen -W "$(_module_savelist)" -- "$cur") );;
        rm|del|remove|unload)
                        COMPREPLY=( $(compgen -W "@comp_unload_opts@ ${LOADEDMODULES//:/ }" -- "$cur") );;
        switch|swap)    COMPREPLY=( $(compgen -W "@comp_load_opts@ ${LOADEDMODULES//:/ }" -- "$cur") );;
        unuse|is-used)  COMPREPLY=( $(IFS=: compgen -W "${MODULEPATH}" -- "$cur") );;
        use|-a|--append|cachebuild)   ;;               # let readline handle the completion
        display|help|show|test|path|paths|is-loaded|info-loaded)
                        _module_comgen_words_and_files "@comp_mfile_opts@ $(_module_avail "$cur")" "$cur";;
        is-avail)
                        _module_comgen_words_and_files "@comp_isavail_opts@ $(_module_avail "$cur")" "$cur";;
        lint)
                        _module_comgen_words_and_files "@comp_lint_opts@ $(_module_avail "$cur")" "$cur";;
        mod-to-sh)
                        _module_comgen_words_and_files "@comp_modtosh_opts@ $(_module_not_yet_loaded "$cur")" "$cur";;
        whatis)
                        _module_comgen_words_and_files "@comp_whatis_opts@ $(_module_avail "$cur")" "$cur";;
        apropos|keyword|search)
                        COMPREPLY=( $(compgen -W "@comp_search_opts@" -- "$cur") );;
        config|--reset) COMPREPLY=( $(compgen -W "@comp_config_opts@" -- "$cur") );;
        -h|--help|-V|--version|purge|refresh|reload|sh-to-mod|source|state|reset|stash|stashclear|cacheclear)
                        ;;
        append-path|prepend-path)
                        COMPREPLY=( $(compgen -W "@comp_path_opts@" -- "$cur") );;
        remove-path)
                        COMPREPLY=( $(compgen -W "@comp_rm_path_opts@" -- "$cur") );;
        initadd|initclear|initlist|initprepend|initrm)
                        ;;
        *)  if test "$COMP_CWORD" -gt 2
            then
                _module_long_arg_list "$cur"
            else
                case "$cur" in
                # The mappings below are optional abbreviations for convenience
                ls)     COMPREPLY=( "list" );;      # map ls -> list
                sw*)    COMPREPLY=( "switch" );;

                -*)     COMPREPLY=( $(compgen -W "@comp_opts@" -- "$cur") )
                        loaded_modules=""
                        for i in ${LOADEDMODULES//:/ }; do
                            loaded_modules+="-${i} "
                        done
                        COMPREPLY=( "${COMPREPLY[@]}" $(compgen -W "@comp_load_opts@ $loaded_modules" -- "$cur") );;
                *)       _module_comgen_words_and_files "@comp_load_opts@ $(_module_not_yet_loaded "$cur")" "$cur"
                        COMPREPLY=( "${COMPREPLY[@]}" $(compgen -W "@comp_opts@ @comp_cmds@" -- "$cur") )
                        loaded_modules=""
                        for i in ${LOADEDMODULES//:/ }; do
                            loaded_modules+="-${i} "
                        done
                        COMPREPLY=( "${COMPREPLY[@]}" $(compgen -W "@comp_load_opts@ $loaded_modules" -- "$cur") );;
                esac
            fi;;
        esac
    }
    complete -o default -F _ml ml
fi
complete -o default -F _module module