#!/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 each FILE according to its extension.
7z bz2 deb gz iso rar rpm tar xz zip & variations.
See source for exact file extensions."
    if [[ $1 == --help ]]; then
        echo "$help"
    fi
    local x super
    for x in "$@"; do
	case "$x" in
	    *.tar.bz2 | *.tbz2 ) tar xvjf "$x" ;;
	    *.tar.gz | *.tgz ) tar xvzf "$x" ;;
	    *.bz2 ) bunzip2 "$x" ;;
	    *.gz ) gunzip  "$x" ;;
	    *.tar ) tar xvf "$x" ;;
	    *.zip ) unzip "$x" ;;
	    *.Z ) uncompress "$x" ;;
	    *.7z ) 7za x "$x" ;;
	    *.deb ) ar xv "$x" ;;
            *.rpm ) rpm2cpio "$x" | cpio --extract --make-directories --verbose ;;
	    *.tar.xz ) tar Jxvf "$x" ;;
            *.iso )
                if [[ $EUID != 0 ]]; then
                    if [[ $(sudo -v) == Sorry* ]]; then
                        echo error: need superuser priveledge for iso file
                        return 1
                    fi
                    super=sudo
                fi
                local temp_dir=$(mktemp -d)
                losetup -f
                $super mount -o loop "$x" "$temp_dir"
                local dir="${x%%.iso}"
                mkdir "$dir"
                cp -av "$temp_dir"/* "$dir"
                $super umount "$temp_dir"
                ;;
            *.r[0-9][0-9]|*.rar ) unrar x "$x" ;;
	    *)  echo "I don't kno how to extract $x";;
	esac
    done
}