#!/bin/bash

function print_help() {
	bn=`basename $0`
	cat <<E-O-H
Usage: $bn DIR1 DIR2
E-O-H
}

function ask_yesno() {
	local prompt="Yes or No?"
	local text=""
	local default=""
	local answer=""
	local retval=""
	
	while test $# -gt 0 ; do
	case "$1" in
	-y)
		default="yes"
		shift
		;;
	-n)
		default="no"
		shift
		;;
	*)
		prompt="$*"
		break
		;;
	esac
	done
	
	text="$prompt (y/n)"
	if test "X${default}" = "Xyes" ; then
		text="$text [y]"
	elif test "X${default}" = "Xno" ; then
		text="$text [n]"
	fi
	text="$text "
	
	while : ; do
		read -p "$text" -n 1 answer
		case "$answer" in
		y|Y|t|T|1)
			echo ""
			retval=0
			;;
		n|N|f|F|0)
			echo ""
			retval=1
			;;
		'')
			if test "X${default}" = "Xyes" ; then
				retval=0
			elif test "X${default}" = "Xno" ; then
				retval=1
			else
				echo "Please press the <y>-Key or the <n>-Key!" >&2
				echo "Or press Ctrl-C to abort." >&2
				echo ""
				continue
			fi
			;;
		*)
		        echo ""
		        echo "What? $answer?" >&2
		        echo "Please press the <y>-Key or the <n>-Key!" >&2
		        echo "Or press Ctrl-C to abort." >&2
		        echo ""
		        continue
		        ;;
		esac
		break
	done
	return $retval
}


ORIGINAL_DIR=""
MODIFIED_DIR=""

if test $# -le 1 ; then
        set -- -h
fi

while test $# -gt 0 ; do
case "$1" in
-h|--help)
        print_help
        exit 0
        ;;
*)
	ORIGINAL_DIR="$1"
	MODIFIED_DIR="$2"
	break
	;;
esac
done

ORIGINAL_DIR=`echo "$ORIGINAL_DIR" | sed -e 's:/*$::'`
MODIFIED_DIR=`echo "$MODIFIED_DIR" | sed -e 's:/*$::'`

original_files=`find "$ORIGINAL_DIR" -type f`
for original in $original_files ; do
	relpath="${original#${ORIGINAL_DIR}/}"
	reldir=`dirname "$relpath"`
	basename=`basename "$relpath"`
	basename_pattern=`echo "$basename" | sed -E -e 's:^[0-9]{8}-[0-9]{6}.[0-9]{6}-:*-*.*-:'`
	modified_pattern="${MODIFIED_DIR}/${reldir}/${basename_pattern}"
	modified=`echo $modified_pattern`
	if ! test -e "$modified" ; then
		echo "Only in ${ORIGINAL_DIR}: $relpath" >&2
	else
		if ! cmp --quiet "$original" "$modified" ; then
			echo "File differ: $relpath" >&2
			prompt="Display changes?"
			if ask_yesno -n "$prompt" ; then
				compare "$original" "$modified" miff:- | display
			fi
		fi
	fi
done

find "$MODIFIED_DIR" -type f | while read modified ; do
	relpath="${modified#${MODIFIED_DIR}/}"
	reldir=`dirname "$relpath"`
	basename=`basename "$relpath"`
	basename_pattern=`echo "$basename" | sed -E -e 's:^[0-9]{8}-[0-9]{6}.[0-9]{6}-:*-*.*-:'`
	original_pattern="${ORIGINAL_DIR}/${reldir}/${basename_pattern}"
	original=`echo $original_pattern`
	if ! test -e "$original" ; then
		echo "Only in ${MODIFIED_DIR}: $relpath" >&2
	fi
done