lessopen filter

#! /bin/bash

[[ -z $1 ]] && exit

origin="$1"
filename="$origin"
mime=$(file -b --mime-type "$origin")

# determine compression
case $mime in
    application/x-gzip) CAT="gzip -dc" ;;
    application/x-bzip*) CAT="bzip2 -dc" ;;
    application/x-xz) CAT="xz -dc" ;;
    *) CAT="cat" ;;
esac

# uncompress
if [[ $CAT != cat ]]; then
    mime=$(file -bz --mime-type "$origin")
    if [[ $mime != application/x-tar && $mime != application/x-cpio ]]; then
        filename=$(mktemp --tmpdir XXXXXXXXXX)
        $CAT "$origin" > $filename
    fi
fi

# show file content
case $mime in
    audio/*)
        echo "$origin"
        mtag "$filename"
        ;;
    video/*)
        echo "$origin"
        ffprobe "$filename" | tail -n +12
        ;;
    image/*)
        if [[ $mime == image/vnd.djvu ]]; then
            djvused -e print-pure-txt "$filename"
        else
            echo "$origin"
            gm identify "$1"
            exiv2 print "$1"
        fi
        ;;
    text/*)
        [[ $(tput colors) -eq 256 ]] && fmt="xterm256" || fmt="ansi"
        case $mime in
            text/html) elinks -dump "$filename" ;;
            text/troff) groff -T utf8 -mandoc "$filename" ;;
            *) highlight --force -s candy -O $fmt "$filename" ;;
        esac
        ;;
    application/x-tar)
        if [[ $filename == *.ipkg ]]; then
            chkpkg -p "$filename"
        else
            $CAT "$filename" | tar -vt
        fi
        ;;
    application/x-zip)
        unzip -v "$filename"
        ;;
    application/x-rar)
        unrar l "$filename"
        ;;
    application/pdf)
        pdftotext -q "$filename" -
        ;;
    application/postscript)
        ps2ascii "$filename"
        ;;
    application/vnd.oasis.opendocument.text)
        odt2txt "$filename"
        ;;
    application/msword|application/vnd.ms-office)
        catdoc "$filename"
        ;;
    *)
        $CAT "$filename"
        ;;
esac

# cleanup
[[ $filename != $origin ]] && rm -r $filename