extract.sh

#!/bin/zsh

helpFunction()
{
    echo ""
    echo "Usage: $0 archive.ext destination"
    echo "Extract an archive based on its extension."
    echo "\$1 required: archive to extract"
    echo "\$2 optional: directory to extract to"
    echo "By default extracts to the same name as \$1"
    exit 1
}

if [ $# -eq 0 ] || [ $# -gt 2 ]; then
        helpFunction
fi

# parse path/fileName.extension
fileName=$(basename -- "$1")
if [[ "$fileName" =~ \.tar\..* ]]; then
    extension="tar.${fileName##*.}"
else
    extension="${fileName##*.}"
fi
extension=$(echo "$extension" | tr '[:upper:]' '[:lower:]')
fileName="${fileName%.*}"

# destination is $2 or simply the fileName
directory=$fileName
if [ -n "$2" ]; then
    directory=$2
fi

# make directory if it doesnt exist
if [ ! -d "$directory" ] && [ ! -L "$directory" ]; then
    mkdir -p "$directory"
fi

# extract based on extension
case "$extension" in
    tar.gz)     tar -xzvf "$1" -C "$directory" ;;
    tar.bz2)    tar -xjvf "$1" -C "$directory" ;;
    tar.xz)     tar -xJvf "$1" -C "$directory" ;;
    tar)        tar -xvf "$1" -C "$directory" ;;
    zip)        unzip -d "$directory" "$1" ;;
    7z)         7z x "$1" -o"$directory" ;;
    gz)         gunzip -c "$1" > $directory ;;
    rar)        unrar x "$1" "$directory" ;;
    iso)        echo "Cannot extract ISO files, use a tool like mount."
                exit 1 ;;
    *)          echo "Unsupported file extension: $extension"
                exit 1 ;;
esac

echo "Extraction completed successfully to $directory."

exit 0