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

_feh()
{
    local cur prev words cword split
    _init_completion -s || return

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

    $split && return

    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $( compgen -W '$( _parse_help "$1" --help )' -- "$cur" ) )
        [[ $COMPREPLY == *= ]] && compopt -o nospace
        [[ $COMPREPLY ]] && return
    fi

    # FIXME: It is hard to determine correct supported extensions.
    # feh can handle any format that imagemagick can plus some others
    _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'
} && complete -F _feh feh

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