#! /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.

usage()
{
	printf $"Usage: quilt push [-afqvm] [--fuzz=N] [--merge[=merge|diff3]] [--leave-rejects] [--color[=always|auto|never]] [--refresh] [num|patch]\n"
	if [ x$1 = x-h ]
	then
		printf $"
Apply patch(es) from the series file.  Without options, the next patch
in the series file is applied.  When a number is specified, apply the
specified number of patches.  When a patch name is specified, apply
all patches up to and including the specified patch.  Patch names may
include the patches/ prefix, which means that filename completion can
be used.

-a	Apply all patches in the series file.

-q	Quiet operation.

-f	Force apply, even if the patch has rejects.

-v	Verbose operation.

--fuzz=N
	Set the maximum fuzz factor (default: 2).

-m, --merge[=merge|diff3]
	Merge the patch file into the original files (see patch(1)).

--leave-rejects
	Leave around the reject files patch produced, even if the patch
	is not actually applied.

--color[=always|auto|never]
	Use syntax coloring (auto activates it only if the output is a tty).

--refresh
	Automatically refresh every patch after it was successfully applied.
"
		exit 0
	else
		exit 1
	fi
}

interrupt()
{
	local patch=$1

	rollback_patch "$patch"
	printf $"Interrupted by user; patch %s was not applied.\n" \
	       "$(print_patch "$patch")" >&2
	exit 1
}

colorize()
{
	if [ -n "$opt_color" ]; then
		awk '
		{ if (/FAILED|hunks? ignored|can'\''t find file|file .* already exists|NOT MERGED/)
		    print "'$color_patch_fail'" $0 "'$color_clear'"
		  else if (/already applied$/)
		    print "'$color_patch_fuzz'" $0 "'$color_clear'"
		  else if (/^Hunk/) {
		    sub(/^Hunk .* with fuzz [0-9]*/,
			"'$color_patch_fuzz'&'$color_clear'")
		    sub(/offset -?[0-9]* lines?/,
			"'$color_patch_offs'&'$color_clear'")
		    print
		  } else
		    print
		}'
	else
		cat
	fi
}

push_patch_args()
{
	local patch=$1

	if [ -z "$opt_reverse" ]
	then
		patch_args "$patch"
	else
		set -- $(patch_args "$patch")
		if [ "${*#-R}" != "$*" ]
		then
			echo "${*#-R}"
		else
			echo "$*" -R
		fi
	fi
}

apply_patch()
{
	local patch=$1 patch_file=$2
	local output

	[ -s "$patch_file" ] || return 0

	set -- patch $QUILT_PATCH_OPTS $(push_patch_args "$patch") \
		     --backup --prefix="$QUILT_PC/$patch/" -f \
		     $no_reject_files $more_patch_args

	if [ "${patch_file:(-3)}" = ".gz" ]
	then
		gzip -cd "$patch_file" | "$@" 2>&1
	elif [ "${patch_file:(-4)}" = ".bz2" ]
	then
		bzip2 -cd "$patch_file" | "$@" 2>&1
	elif [ "${patch_file:(-3)}" = ".xz" ]
	then
		xz -cd "$patch_file" | "$@" 2>&1
	elif [ "${patch_file:(-5)}" = ".lzma" ]
	then
		lzma -cd "$patch_file" | "$@" 2>&1
	elif [ "${patch_file:(-3)}" = ".lz" ]
	then
		lzip -cd "$patch_file" | "$@" 2>&1
	else
		"$@" -i "$patch_file" 2>&1
	fi
}

rollback_patch()
{
	local patch=$1

	$QUILT_DIR/scripts/backup-files $silent_unless_verbose -r -B "$QUILT_PC/$patch/" -
}

cleanup_patch_output()
{
	if [ -z "$opt_leave_rejects" ]
	then
		if [ -n "$opt_quiet" ]; then
			# In this case, patch does not allow us to find out
			# which file contains the rejects; it only tells us
			# which reject file is used. We use a single temporary
			# reject file, so this does not help us.

			awk '
			{ gsub(/ -- saving rejects to (file )?.*/, "") }
			{ print }
			'
		else
			awk '
			/^patching file / { filename = substr($0, 15) }
			{ gsub(/ -- saving rejects to (file )?.*/,
			       " -- rejects in file " filename) }
			{ print }
			'
		fi
	else
		cat
	fi
}

add_patch()
{
	local patch=$1
	local patch_file=$(patch_file_name "$patch")
	local file status tmp

	printf $"Applying patch %s\n" "$(print_patch "$patch")"
	trap "interrupt $patch" SIGINT

	no_reject_files=
	if [ -z "$opt_leave_rejects" ]; then
		tmp=$(gen_tempfile)
		no_reject_files="-r $tmp"
	fi

	apply_patch "$patch" "$patch_file"
	status=$?
	trap "" SIGINT

	[ -n "$tmp" ] && rm -f $tmp

	if [ $status -eq 0 -o -n "$opt_force" ]
	then
		add_to_db "$patch"
		if [ $status -eq 0 ]
		then
			rm -f "$QUILT_PC/$patch~refresh"
		else
			touch "$QUILT_PC/$patch~refresh"
		fi

		if [ -e "$QUILT_PC/$patch" ]
		then
			touch "$QUILT_PC/$patch/.timestamp"
		else
			mkdir "$QUILT_PC/$patch"
		fi

		if ! [ -e "$patch_file" ]
		then
			printf $"Patch %s does not exist; applied empty patch\n" \
			       "$(print_patch "$patch")"
		elif [ -z "$(shopt -s nullglob ; echo "$QUILT_PC/$patch/"*)" ]
		then
			printf $"Patch %s appears to be empty; applied\n" \
			       "$(print_patch "$patch")"
		elif [ $status -ne 0 ]
		then
			printf $"Applied patch %s (forced; needs refresh)\n" \
			       "$(print_patch "$patch")"
		fi
	else
		rollback_patch "$patch"
		tmp=$(gen_tempfile)
		no_reject_files="-r $tmp"
		opt_reverse=1
		if apply_patch "$patch" "$patch_file" > /dev/null 2> /dev/null
		then
			printf $"Patch %s can be reverse-applied\n" \
			       "$(print_patch "$patch")"
		else
			printf $"Patch %s does not apply (enforce with -f)\n" \
			       "$(print_patch "$patch")"
		fi
		rollback_patch "$patch"
		rm -f $tmp
		status=1
	fi
	trap - SIGINT
	return $status
}

list_patches()
{
	local top=$(top_patch) n=0 patch
	if [ -n "$top" ]
	then
		patches_after "$top"
	else
		cat_series
	fi \
	| if [ -n "$opt_all" ]
	then
		cat
	else
		while read patch
		do
			if [ -n "$number" ]
			then
				if [ $n -eq $number ]
				then
					break
				fi
				n=$[$n+1]
			fi
			echo "$patch"
			if [ -z "$number" -a "$patch" = "$stop_at_patch" ]
			then
				break
			fi
		done
	fi
}

check_duplicate_patches()
{
	local IFS=$'\n'
	local -a duplicates
	local patch

	duplicates=($((applied_patches ; printf $'%s\n' "${patches[@]}") \
		      | awk '{ if (lines[$0]++ == 1) print }'))
	[ ${#duplicates[@]} -ge 1 ] || return 0

	for patch in "${duplicates[@]}"
	do
		printf $"Patch %s is already applied; check your series file\n" \
		       "$(print_patch "$patch")"
	done
	return 1
}

options=`getopt -o fqvam::h --long fuzz:,merge::,leave-rejects,color::,refresh -- "$@"`

if [ $? -ne 0 ]
then
	usage
fi

eval set -- "$options"

while true
do
	case "$1" in
	-f)
		opt_force=1
		shift ;;
	-q)
		opt_quiet=1
		shift ;;
	-v)
		opt_verbose=1
		shift ;;
	-a)
		opt_all=1
		shift ;;
	-h)
		usage -h
		;;
	--fuzz)
		opt_fuzz=$2
		shift 2 ;;
	-m | --merge)
		case "$2" in
		"" | merge)
			opt_merge=1
			opt_merge_arg= ;;
		diff3)
			opt_merge=1
			opt_merge_arg="=diff3" ;;
		*)
			usage ;;
		esac
		shift 2 ;;
	--leave-rejects)
		opt_leave_rejects=1
		shift ;;
	--color)
		case "$2" in
		"" | always)
			opt_color=1 ;;
		auto | tty)
			opt_color=
			[ -t 1 ] && opt_color=1 ;;
		never)
			opt_color= ;;
		*)
			usage ;;
		esac
		shift 2 ;;
	--refresh)
		opt_refresh=1
		shift ;;
	--)
		shift
		break ;;
	esac
done

if [ $# -gt 1 -o \( -n "$opt_all" -a $# -ne 0 \) ]
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

setup_colors

if [ -n "$opt_force" -a -n "$opt_refresh" ]
then
	printf $"Options %s and %s are mutually exclusive\n" "-f" "--refresh"
	exit 1
fi

if [ $# -eq 1 ]
then
	if is_numeric "$1"
	then
		number=$1
	else
		stop_at_patch=$1
	fi
else
	[ -z "$opt_all" ] && number=1
fi

stop_at_patch=$(find_unapplied_patch "$stop_at_patch") || exit

[ -z "$opt_verbose" ] && silent_unless_verbose=-s
[ -n "$opt_force" ] && opt_leave_rejects=1

more_patch_args=
[ -n "$opt_quiet" ] && more_patch_args="$more_patch_args -s"
if [ -n "$opt_merge" ]
then
	more_patch_args="$more_patch_args --merge$opt_merge_arg"
fi
[ -n "$opt_fuzz" ] && more_patch_args="$more_patch_args -F$opt_fuzz"

top=$(top_patch)
if [ -n "$top" -a -e "$QUILT_PC/$top~refresh" ]
then
	printf $"The topmost patch %s needs to be refreshed first.\n" \
	       "$(print_patch "$top")"
	exit 1
fi

patches=$(list_patches)
if [ -z "$patches" ]
then
	printf $"No patch applied\n" >&2
	exit 2
fi

# In theory, these patches can't be already applied. However in the case
# of a generated or manually tweaked series file, this could happen and
# cause havoc, so play it safe and check.
check_duplicate_patches || exit 1

create_db
for patch in $patches
do
	if ! add_patch "$patch"
	then
		exit 1
	fi
	[ -z "$opt_refresh" ] || quilt_command refresh $QUILT_REFRESH_ARGS
	[ -n "$opt_quiet" ] || echo
done \
| cleanup_patch_output \
| colorize

if [ ${PIPESTATUS[0]} -eq 0 ]; then
	set -- $patches
	printf $"Now at patch %s\n" "$(print_patch ${!#})"
else
	exit 1
fi