#! /usr/bin/env 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.

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

usage()
{
	printf $"Usage: quilt remove [-P patch] {file} ...\n"
	if [ x$1 = x-h ]
	then
		printf $"
Remove one or more files from the topmost or named patch.  Files that
are modified by patches on top of the specified patch cannot be removed.

-P patch
	Remove named files from the named patch.
"
		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=$(find_applied_patch "$opt_patch") || exit 1

status=0
for file in "$@"
do
	if ! file_in_patch "$SUBDIR$file" "$patch"
	then
		printf $"File %s is not in patch %s\n" \
		       "$SUBDIR$file" "$(print_patch "$patch")" >&2
		status=1
		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")"
		status=1
		continue
	fi

	# Restore file from backup
	if ! $QUILT_DIR/scripts/backup-files -r -t -s -B "$QUILT_PC/$patch/" "$SUBDIR$file"
	then
		printf $"Failed to remove file %s from patch %s\n" \
		       "$SUBDIR$file" "$(print_patch "$patch")" >&2
		status=1
		continue
	fi

	if [ -e "$(dirname "$QUILT_PC/$patch~refresh")" -a \
	     -e "$(patch_file_name "$patch")" ]
	then
		# The patch must be refreshed in order to get rid of the
		# patch permanently.
		touch "$QUILT_PC/$patch~refresh"
	fi

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