# bash completion for feh(1)                               -*- shell-script -*-

_comp_cmd_feh()
{
    local cur prev words cword was_split comp_args
    _comp_initialize -s -- "$@" || return

    local noargopts='!(-*|*[foO|KCjeM@TSRHWEyJabgLD~^]*)'
    # shellcheck disable=SC2254
    case "$prev" in
        --image-bg | -B)
            _comp_compgen -- -W 'checks white black'
            return
            ;;
        --filelist | --output | --output-only | --start-at | -${noargopts}[foO\|])
            _comp_compgen_filedir
            return
            ;;
        --caption-path | --fontpath | --output-dir | -${noargopts}[KCj])
            _comp_compgen_filedir -d
            return
            ;;
        --font | --menu-font | --title-font | -${noargopts}[eM@])
            # expect string like "dejavu.ttf/12"
            if [[ $cur == */* ]]; then # expect integer value
                _comp_compgen -R -- -P "$cur" -W '{0..9}'
                compopt -o nospace
                return
            fi
            local font_path
            # font_path="$(imlib2-config --prefix 2>/dev/null)/share/imlib2/data/fonts"
            # _comp_compgen -C "$font_path" -- -f -X "!*.@([tT][tT][fF])" -S /
            for ((i = ${#words[@]} - 1; i > 0; i--)); do
                if [[ ${words[i]} == -@(C|-fontpath) ]]; then
                    font_path="${words[i + 1]}"
                    _comp_compgen -aC "$font_path" -- \
                        -f -X "!*.@([tT][tT][fF])" -S /
                fi
            done
            compopt -o nospace
            return
            ;;
        --theme | -${noargopts}T)
            local conf_path=~/.config/feh/themes
            local theme_name theme_opts
            [[ -r $conf_path ]] || return
            while read -r theme_name theme_opts; do
                if [[ $theme_name == '#'* || $theme_name == "" ]]; then
                    continue
                fi
                _comp_compgen -a -- -W "$theme_name"
            done <"$conf_path"
            return
            ;;
        --sort | -${noargopts}S)
            _comp_compgen -- -W 'name filename mtime width height pixels size
                format'
            return
            ;;
        --reload | --limit-height | --limit-width | --thumb-height | --thumb-width | \
            --thumb-redraw | --magick-timeout | -${noargopts}[RHWEyJ])
            # expect integer value
            _comp_compgen -aR -- -W '{0..9}'
            compopt -o nospace
            return
            ;;
        --zoom)
            # expect integer value or "max", "fill"
            _comp_compgen -- -W 'max fill'
            if [[ ! $cur || ! ${COMPREPLY-} ]]; then
                _comp_compgen -aR -- -W '{0..9}'
                compopt -o nospace
            fi
            return
            ;;
        --alpha | -${noargopts}a)
            _comp_compgen -- -W '{0..255}'
            return
            ;;
        --bg | -${noargopts}b)
            _comp_compgen_filedir
            _comp_compgen -a -- -W 'trans'
            return
            ;;
        --geometry | --max-dimension | --min-dimension | -${noargopts}g)
            # expect string like 640x480
            if [[ $cur && $cur != *x* ]]; then
                COMPREPLY=(x)
            fi
            _comp_compgen -aR -- -W "{0..9}"
            compopt -o nospace
            return
            ;;
        --customlist | --index-info | --info | --slideshow-delay | --thumb-title | \
            --title | -${noargopts}[LD~^])
            # argument required but no completions available
            return
            ;;
    esac

    [[ $was_split ]] && return

    if [[ $cur == -* ]]; then
        # Some versions of feh just output "See 'man feh'" for --help :(
        _comp_compgen_help
        if [[ ${COMPREPLY-} ]]; then
            [[ $COMPREPLY == *= ]] && compopt -o nospace
            return
        fi
    fi

    # FIXME: It is hard to determine correct supported extensions.
    # feh can handle any format that imagemagick can plus some others
    _comp_compgen_filedir 'xpm|tif?(f)|png|p[npgba]m|iff|?(i)lbm|jp?(e)g|jfi?(f)|gif|bmp|arg?(b)|tga|xcf|ani|ico|?(e)ps|pdf|dvi|txt|svg?(z)|cdr|[ot]tf|ff?(.gz|.bz2)|webp'
} &&
    complete -F _comp_cmd_feh feh

# ex: filetype=sh