appdwarf/appdwarf

#!/bin/bash
set -eo pipefail
IFS=$'\n\t'
version=1.2

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 "    -u,  --url          Fetch AppImage from URL and convert to appdwarf"
}

dwarf() {
    mkdwarfs -i "$1" -o "$(basename "$1").sh" -B5 "${@:2}" --header <(cat << 'EOF'
#!/bin/sh
DIR="$(mktemp -td dwarf_$(basename "$0")XXXXX)"
ARG="-o offset=auto -o tidy_strategy=swap -o workers=4"
dwarfs $ARG "$0" "$DIR" 2>/dev/null
export APPDWARF_CMD=$(basename "$0")
"$DIR/AppRun" "$@"
fusermount -u "$DIR"
rmdir "$DIR"
exit
EOF
)

chmod +x "$(basename "$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
}


while true
do
    case "$1" in
        --help | -h) 
            usage
            exit 0
            ;;
        --version) 
            echo "$version"
            exit 0
            ;;
        --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