#!/bin/sh

#
# Fork the next patch in the series
#

. 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: forkpatch <newname>"
	exit 1
}

if [ $# -ne 1 ]
then
	usage
fi

NEW=$1
BASE=`stripit $NEW`
SERIES=series

if [ ! -e $SERIES ]
then
	echo 'File "series" not found'
	exit 1
fi

if [ -f $P/$BASE.patch ] ; then 
        echo "Patch $NEW already exists as a file"
        exit 1
fi

if  grep $BASE $SERIES >& /dev/null ; then 
        echo "Patch $NEW already exists in series"
        exit 1
fi

TMPSERIES=$(mktemp /tmp/series-XXXXXXXX)
top=$(toppatch)
if [ x"$top" == x ]
then
	todo=$(head -1 $SERIES)
else
	last_in_series=$(stripit $(tail -1 $SERIES))
	if [ $last_in_series == $top ]
	then
		echo "Series fully applied.  Ends at $top"
		exit 0
	fi
	todo=$(grep -C1 "^$top\.patch" $SERIES | tail -1)
	if [ x$todo = x ]
	then
		todo=$(head -1 $SERIES)
	fi
fi

basetodo=`stripit $todo`

sed "s/$todo/$BASE.patch/" < $SERIES > $TMPSERIES
cat $TMPSERIES > $SERIES
rm -f $TMPSERIES
cp -f $P/patches/$todo $P/patches/$BASE.patch
cp -f $P/pc/$basetodo.pc $P/pc/$BASE.pc
if [ -f $P/txt/$basetodo.txt ]; then 
     cp -f $P/txt/$basetodo.txt $P/txt/$BASE.txt
else 
     echo "Warning no documentation for $BASE"
fi

echo "Cloned $todo to $BASE"