#!/usr/bin/env bash
# set -x # uncomment for debug

# Copyright (c) 2011-2012 Joshua I. Haase H. (xihh) <hahj87@gmail.com>
# Copyright (c) 2011-2012 Nicolás Reynolds <fauno@kiwwwi.com.ar>
# Copyright (c) 2012 Michał Masłowski <mtjm@mtjm.eu>
# Copyright (c) 2012-2013 Luke Shumaker <LukeShu@sbcglobal.net>
#
# The copy_files() function is taken from makechrootpkg:
#   Copyright (c) 2007 Armin Luntzer <armin@archlinuxppc.org>
#   Copyright (c) 2007 Jason Chu <jchu@xentac.net>
#   Copyright (c) 2007, 2011 Dan McGee <dan@archlinux.org>
#   Copyright (c) 2007-2008 Travis Willard <travis@archlinux.org>
#   Copyright (c) 2007-2009 Aaron Griffin <aaronmgriffin@gmail.com>
#   Copyright (c) 2008 Simo Leone <simo@archlinux.org>
#   Copyright (c) 2009 Biru Ionut <biru.ionut@gmail.com>
#   Copyright (c) 2009 Biru Ionut <ionut@archlinux.ro>
#   Copyright (c) 2009 Evangelos Foutras <foutrelis@gmail.com>
#   Copyright (c) 2009 Francois Charette <francois@samarqand.localdomain>
#   Copyright (c) 2009 Nezmer <Nezmer@allurelinux.org>
#   Copyright (c) 2009 Ronald van Haren <pressh@gmail.com>
#   Copyright (c) 2009-2011 Andrea Scarpino <andrea@archlinux.org>
#   Copyright (c) 2009-2012 Allan McRae <allan@archlinux.org>
#   Copyright (c) 2009-2012 Eric Bélanger <snowmaniscool@gmail.com>
#   Copyright (c) 2009-2012 Pierre Schmitz <pierre@archlinux.de>
#   Copyright (c) 2010 Byron Clark <byron@theclarkfamily.name>
#   Copyright (c) 2011 Ionut Biru <ibiru@archlinux.org>
#   Copyright (c) 2011 Lukas Fleischer <archlinux@cryptocrack.de>
#   Copyright (c) 2011-2012 Florian Pritz <bluewind@xinu.at>
#   Copyright (c) 2011-2013 Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
#   Copyright (c) 2013 Sébastien Luttringer <seblu@seblu.net>
#
# Because of the code from makechrootpkg, this file is GPLv2, instead of GPLv3
# like most of libretools.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.


# Builds packages from ABS recursively. It tries to find dependencies that
# aren't built or need update and then makepkg them in order.

# TODO: fullpkg-find should find packages wich depend on the
#       package to be build, so we can avoid "missing $name.so errors"

# Get repo name. Asumes ${ABSROOT}/repo/package/PKGBUILD
guess_repo() {
	basename "$(dirname "$(pwd)")"
}

# This function is stolen from makechrootpkg.
copy_files() {

	local copydir="$build_dir/${pkgbase:-${pkgname[0]}}"
	mkdir -p "$copydir"

	# Copy PKGBUILD and sources
	cp PKGBUILD "$copydir"
	(
		load_PKGBUILD
		for file in "${source[@]}"; do
			file="${file%%::*}"
			file="${file##*://*/}"
			if [[ -f $file ]]; then
				cp "$file" "$copydir/"
			elif [[ -f $SRCDEST/$file ]]; then
				cp "$SRCDEST/$file" "$copydir/"
			fi
		done

		# Find all changelog and install files, even inside functions
		for i in 'changelog' 'install'; do
			while read -r file; do
				# evaluate any bash variables used
				eval file=\"$(sed "s/^\\(['\"]\\)\\(.*\\)\\1\$/\\2/" <<< "$file")\"
				[[ -f $file ]] && cp "$file" "$copydir"
			done < <(sed -n "s/^[[:space:]]*$i=//p" PKGBUILD)
		done
	)
}

# Checks ABSROOT and look for target pkg deps. Adds them if not built or outdated.
find_deps() {
	# Check this level
	load_PKGBUILD

	local repo="${repo:-$(guess_repo)}"
	local pkgbase="${pkgbase:-${pkgname[0]}}"

	# Checking any package built, since otherwise e.g. kdebase would
	# be always considered outdated: there is no package built named kdebase.
	# TODO: maybe check for the package requested in case of recursive calls,
	# instead of the first one listed?
	if is_built "${pkgname[0]}" "$(get_full_version "${pkgname[0]}")"; then
		exit 0 # pkg is built and updated
	fi

	# greater levels are built first
	echo "${LEVEL}:${pkgbase}" >>"$build_dir/BUILDORDER"
	# PKGBUILD is already there
	if [[ -d "${build_dir}/${pkgbase}" ]]; then
		exit 0
		# Copy dir to build_dir
	else
		copy_files

		# to identify repo later
		echo "repo=$repo" > "${build_dir}/${pkgbase}/.INFO"
	fi

	# current package plus a space for every level
	msg2 "%${LEVEL}s%s" '' "${pkgbase}-$(get_full_version)"

	## Check next levels
	declare -i next_level=$LEVEL+1

	# All deps
	local deps=("${depends[@]}" "${makedepends[@]}" "${checkdepends[@]}")
	# Strip version specifiers
	deps=("${deps[@]%%[=<>]*}")
	# Filter out duplicates
	read -d $'\n' -a deps <<<"$(printf '%s\n' "${deps[@]}"|sort -u)"

	local _dep
	for _dep in "${deps[@]}"; do

		local found=false
		# May fail, e.g. since abslibre-mips64el doesn't include
		# arch=any packages.
		local pkgdir=$(toru -p ${_dep}) || true

		if [[ -n "$pkgdir" ]] && [[ -d "${pkgdir}" ]; then
			found=true

			pushd "${pkgdir}" > /dev/null
			# runs itself on dep's PKGBUILD dir
			"$0" -l "${next_level}" "${build_dir}" || return $?
			popd > /dev/null
		fi

		if ! (( found )); then
			echo "dep_not_found:$_dep" >>$build_dir/log
		fi

	done

	## End variable block

	unset next_level dir
}

. libremessages
. $(librelib conf.sh)
load_files makepkg

LEVEL=0
MAXLEVEL=20
CLEANFIRST='false'
UPDATEDB='true'

usage() {
	print "Usage: %s [OPTIONS] [BUILD_DIR]" "${0##*/}"
	print "Finds package dependencies and sets up a build order"
	echo
	prose "Run this from a directory containing a PKGBUILD."
	echo
	prose "This script will create a BUILD_DIR for recursive building; it
	       tries to find dependencies that aren't built or need update."
	echo
	prose "If no BUILD_DIR is specified, it will create a temporary
	       directory."
	echo
	print "Options:"
	flag "-h" "Show this message"
	flag "-A <$(_ ABSROOT)>" "Use ABSROOT as the root of the ABS tree"
	flag "-c" "Clean BUILD_DIR before working."
	flag "-m <$(_ MAX_LEVEL)>" "Limit the depth of the dependency recursion"
	flag "-n" "Don't update pacman DB"
}

while getopts 'hA:l:cmn' arg; do
	case "$arg" in
		h) usage; exit 0 ;;
		A) ABSROOT="$OPTARG" ;;
		l) LEVEL="$OPTARG" ;; # hidden option to know dep level.
		c) CLEANFIRST='true' ;;
		m) MAXLEVEL="$OPTARG" ;;
		n) UPDATEDB='false' ;;
	esac
done

if [[ ! -r PKGBUILD ]]; then
	error "This directory doesnt contain a PKGBUILD"
	usage
	exit 1
fi

shift $(( OPTIND - 1 ))
build_dir="${1}"

if [[ "$LEVEL" -eq 0 ]]; then

	build_dir="${1:-$(mktemp -d /tmp/fullpkg.XXXXXX)}"

	if [[ ! -d "$build_dir" ]]; then
		mkdir -p "$build_dir"
	elif "$CLEANFIRST"; then
		# Erase files already in dir
		msg "Cleaning up files in dir"
		find "$build_dir" -mindepth 1 -delete
	fi

	if "$UPDATEDB"; then
		msg "Updating pacman db"
		sudo pacman -Sy --noconfirm || true
	fi

	# make files for log and buildorder
	touch "${build_dir}"/{log,BUILDORDER}
	buildorder="${build_dir}/BUILDORDER"

	msg "Checking dependencies"
fi

find_deps

exit 0