#!/bin/bash
#Usage fdiff <sed command> <file1> <file2>

pattern="$1"
file1="$2"
file2="$3"

#We don't want to have a case like this:
# 's/a'b//
#We need to change that to this:
# 's/a'"'"'b//

pattern=${pattern//\'/\'\"\'\"\'}
if [ "$file2" = "" ]; then
    echo "Usage: fdiff <sed pcommand> <file> <file>"
    exit;
fi

sedcmd1="sed -e '$pattern' $file1"
sedcmd2="sed -e '$pattern' $file2"
#echo $sedcmd1
#echo $sedcmd2


diff <(eval $sedcmd1) <(eval $sedcmd2)