#!/bin/sh

. patchfns >/dev/null || . /usr/lib/patch-scripts/patchfns >/dev/null || { \
	echo "Impossible to find my library 'patchfns'."
	echo "Check your install, or go to the right directory"
	exit 1
}

usage()
{
	echo "Usage: mpatch patchname [output_dir]"
	exit 1
}

doit()
{
	echo $* 1>&2
	$* || {
		echo oops
		exit 1 
	}
}

epoch()
{
#	doit touch -t 7001011000.00 $1
	doit touch -t 7001010000.00 $1
}

dirfor()
{
	dir=$(dirname $1)
	if [ ! -d $dir ]
	then
		doit mkdir -p $dir
		RMDIRS="$RMDIRS $dir"
	fi
}

if [ $# == 0 ]
then
	usage
fi

PATCH_NAME=$(stripit $1)
OUTPUT_DIR=$2

FILES=$(cat $P/pc/$PATCH_NAME.pc)
OUT=$P/patches/$PATCH_NAME.patch
TMPOUT=$(mktemp /tmp/patch-$PATCH_NAME-XXXXXX)
TXT=$P/txt/$PATCH_NAME.txt
OLDDIR=$(basename $(/bin/pwd))
NEWDIR=$OLDDIR-$LOGNAME

if is_applied_last $PATCH_NAME
then
	true
else
	echo $PATCH_NAME is not the last-applied patch
	exit 1
fi

doit rm -f $OUT
echo "Placing patch in " $OUT

if [ -e $TXT -a -s $TXT ]
then
	echo >> $OUT
	body $TXT >> $OUT
	echo >> $OUT
	echo >> $OUT
else
	echo "**** No patch description for $PATCH_NAME ****"
fi

rm -f $TMPOUT

for file in $FILES
do
	OLD_FILE="$file"~"$PATCH_NAME"
	if [ ! -e $OLD_FILE ]
	then
		OLD_FILE=/dev/null
	fi
	NEW_FILE=$file
	XDIFF_OPTS=""
	if [ ! -e $NEW_FILE ]
	then
		NEW_FILE=/dev/null
		XDIFF_OPTS="-L $file"
	fi

	echo diff -puN $XDIFF_OPTS $DIFF_OPTS $OLD_FILE $NEW_FILE
	diff -puN $XDIFF_OPTS $DIFF_OPTS $OLD_FILE $NEW_FILE | p0-2-p1 $OLDDIR $NEWDIR >> $TMPOUT
done
diffstat -p1 $TMPOUT >> $OUT 2>/dev/null
echo >> $OUT
cat $TMPOUT >> $OUT
echo >> $OUT
echo "_" >> $OUT
rm -f $TMPOUT