extract

#!/usr/bin/env bash

# DESTRUCTIVE: Extracts every archive in the current directory and subdirectories.
# Deletes the original archive only when the files have been extracted successfully.
#
# Can be given a path as an argument.

EXTS=(tar gz 7z zip rar)    # Archive filetypes to search for

dir="$1"
if [[ ! -d "$dir" ]]; then dir="$PWD"; fi

# Check for missing executables
if ! type 7z > /dev/null 2>&1; then
    echo "executable '7z' not found, exiting."
    exit 1
fi

if ! type unrar > /dev/null 2>&1; then
    echo "executable 'unrar' not found, exiting."
    exit 1
fi

find_archives () {
    # Searches for archives in the directory

    # Create a list of arguments from the 'EXTS' variable to be used with 'find'
    argument_list="$(printf " -name \*.%s -or" "${EXTS[@]}" | sed 's, -or$,,g')"

    # Find the archives, following symlinks
    eval "find -L \"$dir\" -type f $argument_list"
}

extract_archives () {
    # Read the archives from stdin
    while read file; do
        # If the filetype is a rar-archive, uses unrar, otherwise uses 7z
        # Removes the archive if the files have been extracted successfully

        if [[ "$file" == *.rar ]]; then
            unrar x "$file" "${file%.*}/" > /dev/null 2>&1 \
                && rm -v "$file"
        else
            7z x "$file" -o"${file%.*}/" > /dev/null 2>&1 \
                && rm -v "$file"
        fi
    done
}

archives="$(find_archives)"

if [[ -z "$archives" ]]; then
    echo "No archives in the directory $dir, exiting."
    exit
fi

# Count the number of archives found and ask the user whether or not to continue

echo "$archives" | wc -l | tr -d '\n'
read -p " archive files will be extracted and deleted, continue (y/N)? " answer

# Continue only when the user has answered with 'y' or 'Y'
if [[ $answer == y || $answer == Y ]]; then
    echo "$archives" | extract_archives
fi