#!/bin/bash
# Copyright (C) 2014 Ian Kelling

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

ex() {
    local help="Usage: ex [--help] FILE...
Extract many types of files

Based on their extensions,
7z [tar.]bz2 deb [tar.]gz iso dsc rar rpm sfs tar xpi [tar.]xz zip Z.
See source for exact file extensions.
Note: dtrx (package & command) extracts most of these plus some others."

    if [[ $1 == --help ]]; then
        echo "$help"
    fi
    local x super
    for x in "$@"; do
        case "$x" in
            # tars first, so they are higher pri than non-tar extensions
            *.tar ) tar xf "$x" ;;
            *.tar.bz2 | *.tbz2 ) tar xjf "$x" ;;
            *.tar.gz | *.tgz ) tar xzf "$x" ;;
            *.tar.xz ) tar Jxf "$x" ;;
            *.xz) xz -d "$x" ;;
            *.7z ) 7za x "$x" ;;
            *.bz2 ) bunzip2 "$x" ;;
            *.deb )
              ar x "$x"
              tmp=(data.tar.*)
              case $tmp in
                *.xz) tar xJf data.tar.xz ;;
                *.gz) tar xzf data.tar.gz ;;
                *) echo "error: could not find data.tar.*" >&2; exit 1 ;;
              esac
              tar xzf control.tar.gz
              rm -f control.tar.gz
              rm -f data.tar.*
              ;;
            *.dsc) dpkg-source -x "$x" ;;
            *.gz ) gunzip  "$x" ;;
            *.iso )
                local super
                if [[ $EUID != 0 ]]; then
                    super=sudo
                fi
                local temp_dir=$(mktemp -d)
                $super losetup -f
                $super mount -o loop "$x" "$temp_dir"
                local dir="${x%%.iso}"
                mkdir "$dir"
                cp -a "$temp_dir"/* "$dir"
                $super umount "$temp_dir"
                ;;
            *.jar) jar xf "$x" ;;
            *.r[0-9][0-9]|*.rar ) unrar x "$x" ;;
            *.rpm ) rpm2cpio "$x" | cpio --extract --make-directories ;;
            *.sfs) $super unsquashfs "$x" ;;
            *.Z ) uncompress "$x" ;;
            *.zip|*.xpi ) unzip "$x" ;;

            *)  echo "I don't know how to extract $x";;
        esac
    done
}
ex "$@"