#!/bin/bash
#
# multi-file rename script for Nautilus
# (c) Andrey Yurovsky http://andrey.thedotcommune.com/
#
# To install, place this script into your .gnome2/nautilus-scripts/ directory,
# which is located in your home directory.  'rename' should appear in your
# 'scripts' menu when you restart Nautilus (or log out and then log in again).
#
# Select one or more files in Nautilus, right-click one of the selected files, 
# and choose 'rename' from the 'scripts' menu.  A dialog box will ask for a 
# new name.  Enter a new name, with a starting index in square brackets 
# (ex: [1]).  The selected files will be renamed to this new name, incrementing
# the index each time.  For example, if the new name is "photo[1].jpg", the 
# files will be renamed "photo1.jpg", "photo2.jpg", and so on.
# ask for a name pattern
PATTERN=`zenity --entry --title="Rename Files" --text=name:`
if [ "${#PATTERN}" = "0"  ]; then
    exit
fi
# check that the pattern looks valid
if [ "`echo $PATTERN | egrep [^\[][\[][0-9]+[\]][^\]]`" != $PATTERN ]; then
    zenity --error --text="The name should contain a number in square brackets, for example 'photo[1].jpg' is valid."
    exit
fi

# extract the starting index
BNUM="`echo $PATTERN | awk '{printf( "%d-%d", M=match( $1,/[\[]([0-9]+)[\]]/ )+1, RLENGTH+M-3 );}'`"
NUM=`echo $PATTERN | cut -b $BNUM`

# extract the left and right parts of the new name
let L=${BNUM%-*}-2
let R=${BNUM#*-}+2
LEFT=`echo $PATTERN | cut -b 1-$L`
RIGHT=`echo $PATTERN | cut -b $R-`

# rename each file
for FILE in "$@"; do
    mv "$FILE" "$LEFT$NUM$RIGHT"
    let NUM+=1
done