#!/bin/bash

#

# bakit.sh

#

# Copyright (C) 2010, Branko Majic <branko@majic.rs>

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

#

program="bakit.sh"

version="0.1"

function usage() {

    cat <<EOF

$program $version, a non-interactive utility for creating local on-system

backups of files.

Usage: $program [OPTIONS] file

$program is a non-interactive utility for creating local on-system backups of

files. Its primary use is for the various configuration files found on most of

the systems. It allows you to easily create a timestamped backup of files

specified as input arguments.

$program accepts the following options:

    -v        show script version and licensing information

    -h        show usage help

Please report bugs and send feature requests to <branko@majic.rs>.

EOF

}

function version() {

        cat <<EOF

$program, version $version

+-----------------------------------------------------------------------+

| Copyright (C) 2010, Branko Majic <branko@majic.rs>                    |

|                                                                       |

| This program is free software: you can redistribute it and/or modify  |

| it under the terms of the GNU General Public License as published by  |

| the Free Software Foundation, either version 3 of the License, or     |

| (at your option) any later version.                                   |

|                                                                       |

| This program is distributed in the hope that it will be useful,       |

| but WITHOUT ANY WARRANTY; without even the implied warranty of        |

| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         |

| GNU General Public License for more details.                          |

|                                                                       |

| You should have received a copy of the GNU General Public License     |

| along with this program.  If not, see <http://www.gnu.org/licenses/>. |

+-----------------------------------------------------------------------+

EOF

}

# If no arguments were given, just show usage help.

if [[ -z $1 ]]; then

    usage

    exit 0

fi

# Parse the arguments

while getopts "vh" opt; do

    case "$opt" in

        v) version

           exit 0;;

        h) usage

           exit 0;;

        *) usage

           exit 1;;

    esac

done

i=$OPTIND

shift $(($i-1))

# Create a backup of each provided file

while [[ -n $1 ]]; do

    source="$(echo "$1" | sed -e 's#/\+$##' )"

    bakFile="${source}.bak.$(date +%Y%m%d)"

    # Generate a new name for the backup, making sure the old ones do not get

    # overwritten

    let i=1

    while [[ -e "$bakFile" ]]; do

        bakFile="${source}.bak.$(date +%Y%m%d).$i"

        let i=i+1

    done

    cp -pr "$source" "$bakFile"

    shift

done