#!/bin/bash

DEBUG=FALSE
SIMULATE=FALSE

if [ "$1" == "-s" ]; then
  SIMULATE=TRUE
  shift
fi


if [ "$2" == "" ]; then
  echo "Usage: $0 [options] <pattern> <file> [ <file> .. ]
Renames files using <pattern> passed to sed

OPTIONS
  -s simulate only

EXAMPLE PATTERNS
  's/[^A-Za-z0-9\-_\.]/_/g'
    Remove strange characters from files, replacing with _

  's/[^A-Za-z0-9\-_\.]\{1,\}/_/g'
    Renames all *groups* of strange characters with _
  "
  exit;
fi


PATTERN=$1
shift



echo "----------------------------------------------------------------"
echo -e "  \033[1;37mSTARTING BULK RENAME OF FILES USING REGEXPs\033[0m"
echo "----------------------------------------------------------------"
echo "  PATTERN: $PATTERN"
echo "----------------------------------------------------------------"
echo

for filename in "$@"; do
  newfilename="$( echo "$filename" | sed "$PATTERN" )"
  if [ "$filename" != "$newfilename" ]; then
    echo -e "\033[1;31m- OLDFILE:\033[0m $filename"
    echo -e "\033[1;34m+ NEWFILE:\033[0m $newfilename"
    if [ "$SIMULATE" == "FALSE" ]; then
      mv -i "$filename" "$newfilename"
    fi
    echo
  else
    if [ "$DEBUG" == "TRUE" ]; then
      echo -e "\033[1;33mUNCHANGED:\033[0m $filename"
      echo
    fi
  fi
done