#! /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 files [-v] [-a] [-l] [--combine patch] [patch]\n"
	if [ x$1 = x-h ]
	then
		printf $"
Print the list of files that the topmost or specified patch changes.

-a	List all files in all applied patches.

-l	Add patch name to output.

-v	Verbose, more user friendly output.

--combine patch
	Create a listing for all patches between this patch and
	the topmost or specified patch. A patch name of \`-' is
	equivalent to specifying the first applied patch.

"
		exit 0
	else
		exit 1
	fi
}

options=`getopt -o vhal --long combine: -- "$@"`

if [ $? -ne 0 ]
then
	usage
fi

eval set -- "$options"

while true
do
	case "$1" in
	-v)
		opt_verbose=1
		shift ;;
	-a)
		opt_all=1
		shift ;;
	-l)
		opt_labels=1
		shift ;;
	-h)
		usage -h ;;
	--combine)
		opt_all=1
		if [ "$2" = - ]
		then
			:
		else
			first_patch=$(find_patch_in_series "$2") || exit 1
		fi
		shift 2 ;;
	--)
		shift
		break ;;
	esac
done

if [ $# -gt 1 ]
then
	usage
fi

last_patch=$(find_patch_in_series "$1") || exit 1

if [ -n "$opt_all" -a -z "$first_patch" ]
then
	first_patch=$(applied_patches | head -n 1)
fi

if [ -n "$opt_all" ]
then
	set -- $(patches_before "$last_patch") "$last_patch"
	while [ $# -ge 1 -a "$1" != "$first_patch" ]
	do
		shift
	done
	if [ $# -eq 0 ]
	then
		printf $"Patch %s not applied before patch %s\n" \
		       "$(print_patch "$first_patch")" \
		       "$(print_patch "$last_patch")" >&2
		exit 1
	fi
	patches=( "$@" )
else
	patches=( "$last_patch" )
fi

list_files_in_patch()
{
	local patch=$1
	local status
	local saved_IFS=$IFS

	if [ -n "$opt_all" ] && [ -n "$opt_verbose" ] && [ -z "$opt_labels" ]
	then
		echo "$patch"
	fi
	if [ -n "$opt_verbose" ] && [ -z "$opt_labels" ]
	then
		use_status=yes
	fi
	# Note: If opt_labels is set, then use_status is not set.
	IFS=
	if is_applied "$patch"
	then
		files_in_patch "$patch"
	else
		filenames_in_patch "$patch"
	fi |
	sort |
	while read file
	do
		if [ -n "$opt_labels" ]
		then
			if [ -n "$opt_verbose" ]
			then
				echo -n "[$patch] "
			else
				echo -n "$patch "
			fi
		fi
		if [ -z "$use_status" ]
		then
			echo "$file"
		else
			status=" "
			if [ -s $(backup_file_name "$patch" "$file") ]
			then
				if ! [ -s "$file" ]
				then
					status="-"
				fi
			else
				if [ -s "$file" ]
				then
					status="+"
				fi
			fi
			echo "$status $file"
		fi
	done
	IFS=$saved_IFS
}

setup_pager

for patch in "${patches[@]}"
do
	list_files_in_patch "$patch"
done