fmawk-previewer

#!/usr/bin/env sh
#fm.awk previewer script.

path=$1
cache=$2
b=$3
vRange=$4
top=$5
prevRange=$6

set -e

batorcat() {
	if command -v bat > /dev/null 2>&1; then
		bat --color=always --style=plain --pager=never "$1"
	else
		cat "$1"
	fi
}

_preview_print () {
    b=$1; e=$2; top=$3; shift 3
    awk -F"\n" -v b="$b" -v e="$e" -v top="$top" '{i++; gsub(/\000\r/, "", $1); printf("\033[%s;%sH%s\n",top+i-1,b,$1); if (i >= e) exit }'
}

_check_dep () {
    ! command -v "$1" 1>/dev/null 2>&1 &&
        printf "\033\13338;5;0m\033\13348;5;15m%s\033\133m" "ERROR: Dependency $1 not met." |
        _preview_print "$b" "$vRange" "$top" "$@"
}

_fmawk_preview () {
	[ -f "$cache.jpg" ] && rm "$cache.jpg" > /dev/null #If there's a remaining preview, remove it first (could prevent issues)
	[ -p "$FIFO_UEBERZUG" ] && printf '{"action":"remove","identifier":"PREVIEW"}\n' > "$FIFO_UEBERZUG" #Remove Ueberzug preview if applicable.
	case "$path" in
		*.mp4|*.avi|*.wmv|*.3gp|*.ogv|*.mkv|*.mpg|*.mpeg|*.vob|*.mov|*.webm|*.ts|*.mts) #Video file preview.
            prog="ffmpegthumbnailer"
            _check_dep "$prog" ||
                ffmpegthumbnailer -i "$path" -o "$cache.jpg" -c jpg -s0 -q5 2>/dev/null
			fmawk_dest="$cache.jpg"
            ;;
		*.pdf) #PDF preview.
            prog="pdftoppm"
            _check_dep "$prog" ||
                pdftoppm -jpeg -f 1 -singlefile "$path" "$cache" 2>/dev/null
			fmawk_dest="$cache.jpg"
            ;;
        *.epub)
            prog="epub-thumbnailer"
            _check_dep "$prog" ||
                epub-thumbnailer "$path" "$cache" 1024
			fmawk_dest="$cache.jpg"
		;;
		*.bmp|*.jpg|*.jpeg|*.png|*.webp|*.gif|*.xmp|*.JPG) #Image preview
			fmawk_dest="$path"
            ;;
        *.tgz|*.tar.gz)
            prog="tar"
            _check_dep "$prog" ||
                tar tzf "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.tar.bz2|*.tbz2)
            prog="tar"
            _check_dep "$prog" ||
                tar tjf "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.tar.txz|*.txz)
            prog="xz"
            _check_dep "$prog" ||
                xz --list "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.tar)
            prog="tar"
            _check_dep "$prog" ||
                tar tf "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.gz)
            prog="gunzip"
            _check_dep "$prog" ||
                gunzip -l "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.zip|*.jar|*.war|*.ear|*.oxt)
            prog="unzip"
            _check_dep "$prog" ||
            unzip -l "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.rar)
            prog="unrar"
            _check_dep "$prog" ||
            unrar l "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.7z)
            prog="7z"
            _check_dep "$prog" ||
                7z l "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.[1-8])
            man "$path" | col -b | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.iso)
            prog="iso-info"
            _check_dep "$prog" ||
                iso-info --no-header -l "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.odt|*.ods|*.odp|*.sxw)
            prog="odt2txt"
            _check_dep "$prog" ||
                odt2txt "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.doc)
            prog="catdoc"
            _check_dep "$prog" ||
                catdoc "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.docx)
            prog="docx2txt"
            _check_dep "$prog" ||
                docx2txt "$path" - | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.xls|*.xlsx)
            prog="ssconvert"
            _check_dep "$prog" ||
                ssconvert --export-type=Gnumeric_stf:stf_csv "$path" "fd://1" | batorcat --language=csv | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *.wav|*.mp3|*.flac|*.m4a|*.wma|*.ape|*.ac3|*.og[agx]|*.spx|*.opus|*.as[fx]|*.mka)
            prog="exiftool"
            _check_dep "$prog" ||
                exiftool "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
        *)
            batorcat "$path" | _preview_print "$b" "$vRange" "$top" "$@"
            ;;
	esac
	if [ -f "$fmawk_dest" ]; then #Confirm destination file.
		if [ -p "$FIFO_UEBERZUG" ]; then #Use Ueberzug.
			printf '{ "action":"add", "identifier":"PREVIEW", "x":"%s", "y":"%s", "width":"%s", "height":"%s", "scaler":"contain", "path":"%s" }\n' "$b" 1 "$prevRange" "$vRange" "$fmawk_dest" > "$FIFO_UEBERZUG"
		else
			if command -v chafa > /dev/null; then
				chafa --size "$vRange" "$fmawk_dest" 2>/dev/null | _preview_print "$b" "$vRange" "$top" "$@"
			else
				printf "\033\13338;5;0m\033\13348;5;15m%s\033\133m" "Chafa not found. Unable to display."
			fi
		fi
	fi
}

if [ -f "$path" ]; then #Ensure path exists first.
	_fmawk_preview "$@"
fi
unset fmawk_dest