#!/bin/bash

# Copyright generation script inspired and derived from the ROCK Linux
# (http://www.rocklinux.org) equivalent.

copynote=`mktemp`
oldfile=`mktemp`
newfile=`mktemp`

cat << EOT > $copynote

This copyright note is auto-generated by ./scripts/Create-CopyPatch.
Please add additional copyright information _after_ the line containing
the GSMP-COPYRIGHT-NOTE-END tag. Otherwise it might get removed by
the ./scripts/Create-CopyPatch script. Do not edit this copyright text!

GSMP: @@FILENAME@@
General Sound Manipulation Program is Copyright (C) 2000 - `date +%Y`
  Valentin Ziegler and René Rebe

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2. A copy of the GNU General
Public License can be found in the file LICENSE.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANT-
ABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.

EOT

echo "Creating copy.patch (this may take a while) ..."
echo -n > copy.patch

find -type f -a ! -path '*/.svn/*' -a ! -path "*/old-0.0.5-source/*" \
	-a ! -name '*~' -a ! -name '*.d' -a ! -name '*#' -a ! -name '#*' \
	| sed s,^\./,, | \
while read filename
do
	case $filename in
		*.h*|*.c*|*.lex|*.y|*.spec|*.tcx|*.tmpl|*.tcc) mode=c ;;
		*/Makefile|*.sh|*.pl) mode=sh ;;
		*) echo "Unknown type of $filename"
		   continue ;;
	esac

	grep -q -- '--- NO-GSMP-COPYRIGHT-NOTE ---' $filename && continue

	tag="`grep -- '--- GSMP-COPYRIGHT-NOTE-BEGIN ---' \
	           $filename | sed 's,---.*,,' | head -n 1`"
	cat $filename > $oldfile

	if [ -z "$tag" -a "$mode" = "sh" ] ; then
		sed '1 a\
#\
# --- GSMP-COPYRIGHT-NOTE-BEGIN ---\
# --- GSMP-COPYRIGHT-NOTE-END ---' < $filename > $oldfile
		tag="# "
	fi

	if [ -z "$tag" -a "$mode" = "c" ] ; then
		sed '1 i\
/*\
 * --- GSMP-COPYRIGHT-NOTE-BEGIN ---\
 * --- GSMP-COPYRIGHT-NOTE-END ---\
 */' < $filename > $oldfile
		tag=" \* "
	fi


	if [ -z "$tag" -a "$mode" = "asci" ] ; then
		sed '1 i\
[COPY] --- GSMP-COPYRIGHT-NOTE-BEGIN ---\
[COPY] --- GSMP-COPYRIGHT-NOTE-END ---
' < $filename > $oldfile
		tag="[COPY] "
	fi

	if [ "$tag" ] ; then
	    {
		grep -B 100000 -- '--- GSMP-COPYRIGHT-NOTE-BEGIN ---' $oldfile
		cat $copynote | sed -e "s,@@FILENAME@@,$filename,; s,^,$tag,"
		grep -A 100000 -- '--- GSMP-COPYRIGHT-NOTE-END ---' $oldfile
	    } > $newfile
	    if ! cmp -s $oldfile $newfile ; then
		echo "Creating patch for $filename."
		diff -u ./$filename $newfile |
			sed -e "2 s,$newfile,./$filename," >> copy.patch
	    fi
	else
		echo "WARNING: No Copyright tags in $filename found!"
	fi
done

rm -f $copynote $copynotepatch $newfile