#! /bin/bash

#  This script is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 2 as
#  published by the Free Software Foundation.
#
#  See the COPYING and AUTHORS files for more details.

usage()
{
	printf $"Usage: quilt add [-P patch] {file} ...\n"
	if [ x$1 = x-h ]
	then
		printf $"
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 already applied on top of the specified patch cannot be added.

-P patch
	Patch to add files to.
"
		exit 0
	else
		exit 1
	fi
}

in_valid_dir()
{
	local p=$1 path

	path=${p%/*}
	while [ "$p" != "$path" ]
	do
		if [ "$path" -ef "$QUILT_PATCHES" ]
		then
			printf $"File %s is located below %s\n" \
			       "$1" "$QUILT_PATCHES/"
			return 1
		fi
		if [ "$path" -ef "$QUILT_PC" ]
		then
			printf $"File %s is located below %s\n" \
			       "$1" "$QUILT_PC/"
			return 1
		fi
		p=$path
		path=${path%/*}
	done
}

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

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

patch=$(find_applied_patch "$opt_patch") || exit 1

status=0
for file in "$@"
do
	if ! in_valid_dir "$SUBDIR$file"
	then
		status=1
		continue
	fi
	if file_in_patch "$SUBDIR$file" $patch
	then
		printf $"File %s is already in patch %s\n" \
		       "$SUBDIR$file" "$(print_patch $patch)" >&2
		[ $status -ne 1 ] && status=2
		continue
	fi
	next_patch=$(next_patch_for_file $patch "$SUBDIR$file")
	if [ -n "$next_patch" ]
	then
		printf $"File %s modified by patch %s\n" \
		       "$SUBDIR$file" "$(print_patch $next_patch)" >&2
		status=1
		continue
	fi

	if [ -L "$SUBDIR$file" ]
	then
		printf $"Cannot add symbolic link %s\n" "$SUBDIR$file" >&2
		status=1
		continue
	fi

	if ! $QUILT_DIR/scripts/backup-files -b -s -L -B $QUILT_PC/$patch/ "$SUBDIR$file"
	then
		printf $"Failed to back up file %s\n" "$SUBDIR$file" >&2
		status=1
		continue
	fi

	if [ -e "$SUBDIR$file" ]
	then
		# The original tree may be read-only.
		chmod u+w "$SUBDIR$file"
	fi

	printf $"File %s added to patch %s\n" \
	       "$SUBDIR$file" "$(print_patch $patch)"
done
exit $status
