extract

#!/bin/bash
# @author   Samuel Walters-Nevet                                                                            #
# @date     Summer, 2016; updated Spring 2017                                                               #
# @brief    Extracts an archive based upon its file extension                                               #
# @file     extract.sh                                                                                      #
#                                                                                                           #
# Prerequisits:                                                                                             #
#   sudo apt install tar xz-utils bzip2 unrar gzip unzip p7zip cabextract                                   #
#                                                                                                           #
# Note:                                                                                                     #
#   Aliasing this script in your bashrc file ('~/.bashrc') can make this a lot more useful:                 #
alias extract='bash ~/scripts/extract.sh'
#############################################################################################################

autoincr() {
    f="$1"
    ext=""
    [[ "$f" == *.* ]] && ext=".${f##*.}"

    if [[ -e "$f" ]] ; then
        i=1
        f="${f%.*}";

        while [[ -e "${f}_${i}${ext}" ]]; do
            let i++
        done

        f="${f}_${i}${ext}"
    fi
    echo "$f"
}

function extract {
    for f in "$@"; do
        if [[ -z "$f" ]]; then
            # display usage if no parameters given
            echo "Usage: extract <archive>"
            exit 1;
        elif [[ -z "$f" ]]; then
            # display usage if no parameters given
            echo "$f - file does not exist"
            exit 2;
        fi

        FILE="$(realpath "$f")"
        DIR="${FILE%.*}"

        if [[ "$DIR" == *.part[[:digit:]]* ]]; then
            PART="${DIR##*.part}"
            PART="${PART%.*}"

            if [ "$PART" -eq "$PART" ] 2>/dev/null; then
                DIR="${DIR%.part*}"
            fi
        fi

        while [[ -e "$DIR" ]]; do
            DIR="$(autoincr "$DIR")"
        done

        CUR_DIR="$PWD"

        DIR_TEMP="${DIR}.temp"
        mkdir "$DIR_TEMP" && cd "$DIR_TEMP"

        case "$FILE" in
            *.tar.bz2) tar xvjf "$FILE" ;;
            *.tar.gz) tar xvzf "$FILE" ;;
            *.tar.xz) tar xvJf "$FILE" ;;
            *.lzma) unlzma "$FILE" ;;
            *.bz2) bunzip2 "$FILE" ;;
            *.rar) unrar x -ad "$FILE" ;;
            *.gz) gunzip "$FILE" ;;
            *.tar) tar xvf "$FILE" ;;
            *.tbz2) tar xvjf "$FILE" ;;
            *.tgz) tar xvzf "$FILE" ;;
            *.zip) unzip "$FILE" ;;
            *.Z) uncompress "$FILE" ;;
            *.7z) 7z x "$FILE" ;;
            *.xz) unxz "$FILE" ;;
            *.exe) cabextract "$FILE" ;;
            *) echo "extract: '$FILE' - unknown archive method" ;;
        esac

        cd "$CUR_DIR"

# @TODO:
#   Add method such that:
#       If there is only 1 sub-directory:
#           contents are moved tor DIR_TEMP, and *then* anylized
        if [[ "$(ls -l "$DIR_TEMP" | wc -l)" == 2 ]]; then
            SUB_DIR="${DIR_TEMP}/$(ls "$DIR_TEMP")";

            if [[ -f "$SUB_DIR" ]]; then
                mv "$SUB_DIR" "${DIR}.${SUB_DIR##*.}"
            else
                mv "$SUB_DIR" "$DIR"
            fi

            rmdir "$DIR_TEMP"
        else
            mv "$DIR_TEMP" "$DIR"
        fi
    done
}


extract "$@"