#!/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: trypatch <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  grep $BASE $SERIES >& /dev/null  ; then 
        echo "Patch $NEW already exists in series"
        exit 1
fi

if [ ! -f $P/patches/$BASE.patch ] ; then 
        echo "Patch $NEW doesn't exist as a file"
        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

if  patch -p1 -i $P/patches/$BASE.patch ; then 
    patch -R -p1 -i $P/patches/$BASE.patch

    $basetodo=$(basename $todo)
    sed "s/$todo/$BASE/" < $SERIES > $TMPSERIES
    mv -f $TMPSERIES $SERIES
    echo "Replaced $todo with $BASE"
else 
    echo "Failed to replace $todo with $BASE"
fi