#!/bin/sh

if [ -z "$1" -a -z "$2" ]; then
	echo "Usage: $0 <config1> <config2>"
	exit 64
fi

perl=`which perl`
if [ -z "$perl" ]; then
	echo "Error: perl is required to run this program"
	exit 70
fi

c1="/tmp/config1.tmp"
c2="/tmp/config2.tmp"

run1() {
	if [ ! -r "$1" ]; then
		echo "Cant read config$2: $1"
		exit 66
	fi
	#egrep -v '^\s*#|^\s*$' "$1" | sort -b -k1 -k2 > "$3"
	#egrep -v '^\s*#|^\s*$' "$1" | sed -e 's/\s+/ /g' | sort -b -k1 -k2 > "$3" || exit 2
	#egrep -v '^\s*#|^\s*$' "$1" | perl -e '@I=<>; for(@I){s/^\s*//}; sub k{$_=shift;s/\s+/ /g;$_}; @O=sort {k($a) cmp k($b)} @I; print @O' > "$3" || exit 69
	egrep -v '^[:blank:]*#|^[:blank:]*$' "$1" | perl -e '@I=<>; for(@I){s/^\s*//}; sub k{$_=shift;s/\s+/ /g;$_}; @O=sort {k($a) cmp k($b)} @I; print @O' > "$3" || exit 69

}

run1 "$1" 1 "$c1"
run1 "$2" 2 "$c2"
chmod 666 "$c1" "$c2"

( echo "--- $1"
echo "+++ $2"
diff -uw "$c1" "$c2" ) | less -Si