appdwarf/appdwarf

#!/bin/bash
set -eo pipefail
IFS=$'\n\t'
VER=2
HERE=$(dirname $(readlink -f "${0}"))
source $HERE/headers

usage(){
    echo "Usage: $(basename "$0") [option] [FILE/FOLDER/URL]"
    echo "  Compress a given AppDir (default)"
    echo "    -a,  --appimage     Convert a given AppImage to appdwarf" 
    echo "    -b,  --lookback     Change dwarfs block lookback amount"
    echo "    -f,  --folder       Make image mount to a specified folder instead of running AppRun"
    echo "    -s,  --separate     Use old, separated header format"
    echo "    -u,  --url          Fetch AppImage from URL and convert to appdwarf"

    echo "    -h,  --help         Print this help text"
    echo "    -v,  --version      Print the appdwarf version"
}

dwarf() {
    mkdwarfs -i "$1" -o "$(realpath "$1").sh" -B$back "${@:2}" --header $HEAD
    chmod +x "$(realpath "$1").sh"
}

appimage() {
    if [[ -f "$1" ]]
    then
        chmod +x "$1"
        rm -rf squashfs-root
        ./"$1" --appimage-extract || exit 1
        dwarf squashfs-root "${@:2}"
        rm -rf squashfs-root
        mv squashfs-root.sh "$(basename "$1" .AppImage)".sh
    else
        echo "$1" is not a valid file
        exit 1
    fi
}


################################################################

header
back=5

while true
do
    case "$1" in
        --help | -h) 
            usage
            exit 0
            ;;
        --version | -v) 
            tput setaf 2
            echo appdwarf v"$VER"
            echo Maintained by phantop.
            exit 0
            ;;
        --folder | -f) 
            header_folder $(realpath $2)
            shift 2
            ;;
        --lookback | -b) 
            back=$2
            shift 2
            ;;
        --separate | -s) 
            header_separate
            shift
            ;;

        --appimage | -a) 
            appimage "${@:2}"
            exit 0
            ;;
        --url | -u)
            file=$(basename "$2")
            wget "$2" -O "$file" || exit 1
            appimage "$file" "${@:3}"
            rm "$file"
            exit 0
            ;;
        --) 
            shift; break;;
        *) 
            break;;
    esac
done

if test $# -eq 0; then
    usage
    exit 0
else
    dwarf "$@"
    exit 0
fi