#!/bin/sh

# Read in library functions
if ! [ -r @LIB@/patchfns ]
then
	echo "Cannot read library @LIB@/patchfns" >&2
	exit 1
fi
. @LIB@/patchfns

usage()
{
	echo "Usage: patchadd [-p patchname] filename ..."
	if [ x$1 = x-h ]
	then
		cat <<EOF

Add one or more files to the topmost or named patch.
Files must be added to the patch before being modified.
Files that are modified by patches on top of the specified
patch cannot be added.

-p patchname
	Patch to add files to.

EOF
		exit 0
	else
		exit 1
	fi
}

options=`getopt -o p:h -- "$@"`

if [ $? -ne 0 ]
then
	usage
fi

eval set -- "$options"

while true
do
	case "$1" in
	-p)
		opt_patch=$2
		shift 2 ;;
	-h)
		usage -h ;;
	--)
		shift
		break ;;
	esac
done

if [ $# -lt 1 ]
then
	usage
fi

patch=$(stripit $opt_patch)
if [ -z "$patch" ]
then
	patch=$(top_patch)
fi
if [ -z "$patch" ]
then
	echo "No patches seem to be applied"
fi

if ! is_applied $patch
then
	echo "Patch $patch is not applied"
	exit 1
fi

for file in $*
do
	if file_in_patch $file $patch
	then
		echo "File $file is already in patch $patch"
	else
		next_patch=$(next_patch_for_file $patch $file)
		if [ -n "$next_patch" ]
		then
			echo "File $file shadowed by patch $next_patch"
			exit 1
		fi

		if install_file_in_patch $file $patch
		then
			echo "File $file added to patch $patch"
		fi
	fi
done