#!/bin/bash

# By Marc MERLIN <marc_soft@merlins.org>

set -e

if [ $# -lt 2 ]; then
    echo "$0 [-y|a] rootname initcounter"
    echo "typical is: $0 -y images 100 *.jpg"
    exit
fi

move=no
append=no

if [ "$1" = "-a" ]; then
    shift
    append=yes
fi

if [ "$1" = "-y" ]; then
    shift
    move=yes
fi

root=$1
j=$2

shift 2

> /tmp/reverserename
for i in $*
do
    test -f $i || continue
    ext=${i##*.}

    if [ $append = yes ]; then
	new="${root}_${j}.$ext" 
    else
	new="${j}_${root}.$ext" 
    fi
    echo "$i -> $new"
    echo "mv $new $i" >> /tmp/reverserename
    if [ $move = yes ]; then
	mv $i $new
    fi
    j=`expr $j + 1`
done