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#!/usr/bin/env sh
# SPDX-License-Identifier: GPL-3.0-or-later
# Copyright (c) 2022-2023 Alper Nebi Yasak <alpernebiyasak@gmail.com>
# Copyright (c) 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
# Copyright (c) 2023-2024 Leah Rowe <leah@libreboot.org>

set -u -e

. "include/lib.sh"
. "include/git.sh"

eval `setvars "" xarch cdir defconfig cmakedir xlang mode makeargs elfdir cmd \
    project target target_dir targets xtree _f release bootstrapargs mkhelper \
    autoconfargs listfile autogenargs btype tree rev tree_depend build_depend \
    premake postmake mkhelpercfg dry`

main()
{
	while getopts f:b:m:u:c:x:s:l:n:d: option; do
		[ -n "$_f" ] && $err "only one flag is permitted"
		_f="$1" && [ "$_f" = "-d" ] && dry=":"
		case "$1" in
		-d) mode="" ;;
		-b) mode="" ;;
		-u) mode="oldconfig" ;;
		-m) mode="menuconfig" ;;
		-c) mode="distclean" ;;
		-x) mode="crossgcc-clean" ;;
		-f) mode="fetch" ;;
		-s) mode="savedefconfig" ;;
		-l) mode="olddefconfig" ;;
		-n) mode="nconfig" ;;
		*) $err "invalid option '-$option'" ;;
		esac
		[ -z "${OPTARG+x}" ] && shift 1 && break
		project="${OPTARG#src/}"; shift 2
	done
	[ -z "$_f" ] && $err "missing flag (-m/-u/-b/-c/-x/-f/-s/-l/-n)"
	[ -z "$project" ] && for p in $(ls -1 config/git); do
		./update trees $_f "$p" || $err "!./update trees $_f $p"
		[ "$XBMK_RELEASE" != "y" ] || singletree "$p" || \
		    x_ rm -Rf "src/$p/$p"; continue
	done && return 0

	[ -f "config/git/$project/pkg.cfg" ] || $err "'$project' not defined"

	elfdir="elf/$project"
	datadir="config/data/$project"
	cfgsdir="config/$project"
	listfile="$datadir/build.list" # needed on multi, optional on single
	[ -f "$listfile" ] || listfile="" # optional on all projects

	mkhelpercfg="$datadir/mkhelper.cfg"

	targets="$@"
	remkdir "${tmpgit%/*}"
}

handle_project()
{
	cmd="build_targets $targets" && singletree "$project" && \
	    cmd="build_project"; $cmd

	[ -f "$listfile" ] || return 0
	[ -z "$mode" ] && $dry printf "\n\nOK! Check %s/\n\n" "$elfdir"; :
}

build_project()
{
	configure_project "$cfgsdir" || return 0

	dest_dir="$elfdir"
	[ ! -f "$listfile" ] || elfcheck || return 0

	cdir="src/${project}"
	x_ ./update trees -f "$project"

	[ "$mode" = "distclean" ] && mode="clean"
	run_make_command || return 0

	[ -n "$mode" ] || $dry copy_elf; return 0
}

build_targets()
{
	[ -d "$cfgsdir" ] || $err "directory, $cfgsdir, does not exist"

	[ $# -gt 0 ] || \
	    targets="$(ls -1 "$cfgsdir")" || $err "$cfgsdir: Canot get options"

	handle_targets
}

handle_targets()
{
	for x in $targets; do
		[ "$x" = "list" ] && x_ ls -1 "config/$project" && \
		    listfile="" && break
		target="$x"
		printf "'make %s', '%s', '%s'\n" "$mode" "$project" "$target"
		x_ handle_defconfig
		[ -n "$mode" ] || [ -z "$postmake" ] || $postmake || \
		    $err "$project/$target: !postmake: $postmake"; continue
	done; return 0
}

handle_defconfig()
{
	handle_src_tree "$target" || return 0

	for y in "$target_dir/config"/*; do
		[ "$_f" = "-d" ] || [ -f "$y" ] || continue
		[ "$_f" = "-d" ] || defconfig="$y"

		[ -n "$mode" ] || check_defconfig || continue
		handle_makefile
		[ -n "$mode" ] || $dry copy_elf
	done; return 0
}

handle_src_tree()
{
	target_dir="$cfgsdir/$target"

	[ -f "CHANGELOG" ] || fetch_project "$project"
	configure_project "$target_dir" || return 1
	x_ mkdir -p "$elfdir/$target"

	chkvars tree
	cdir="src/$project/$tree"

	if [ "$mode" = "distclean" ] || [ "$mode" = "crossgcc-clean" ]; then
		[ -d "$cdir" ] || return 1
	fi
	x_ ./update trees -f "$project" "$target"

	[ -z "$mode" ] && $dry check_cross_compiler; return 0
}

configure_project()
{
	eval `setvars "" xarch xlang build_depend autoconfargs xtree postmake \
	    tree_depend makeargs btype mkhelper bootstrapargs premake release`
	[ -f "$1/target.cfg" ] || btype="auto"
	[ -f "$datadir/mkhelper.cfg" ] && eval `setcfg "$datadir/mkhelper.cfg"`

	_tcfg="$1/target.cfg"
	while [ -f "$_tcfg" ] || [ "$cmd" = "build_targets" ]; do
		eval `setvars "" rev tree`

		printf "Loading %s config: %s\n" "$project" "$_tcfg"
		eval `setcfg "$_tcfg"`

		[ "$_f" = "-d" ] && build_depend="" # dry run
		[ "$cmd" = "build_project" ] && break
		[ "$mode" = "fetch" ] || break

		[ "${_tcfg%/*/target.cfg}" = "${_tcfg%"/$tree/target.cfg"}" ] \
		    && break; _tcfg="${_tcfg%/*/target.cfg}/$tree/target.cfg"
	done

	[ "$XBMK_RELEASE" = "y" ] && [ "$release" = "n" ] && return 1
	[ -z "$btype" ] || [ "${mode%config}" = "$mode" ] || return 1

	if [ -z "$mode" ]; then
		for bd in $build_depend; do
			bd_p="${bd%%/*}"; bd_t="${bd##*/}"
			[ -z "$bd_p" ] && $dry $err "$project/$tree: !bd '$bd'"
			[ "${bd##*/}" = "$bd" ] && bd_t=""
			[ -z "$bd_p" ] || $dry ./update trees -b $bd_p $bd_t \
			    || $err "!mk $project/$tree $bd_p/$bd_t"
		done
	fi

	[ "$mode" = "fetch" ] || return 0
	[ -f "CHANGELOG" ] && return 1; fetch_${cmd#build_}; return 1
}

check_cross_compiler()
{
	for _xarch in $xarch; do
		cbdir="src/coreboot/$tree"
		[ "$project" != "coreboot" ] && cbdir="src/coreboot/default"
		[ -n "$xtree" ] && cbdir="src/coreboot/$xtree"

		x_ ./update trees -f coreboot ${cbdir#src/coreboot/}

		export PATH="$PWD/$cbdir/util/crossgcc/xgcc/bin:$PATH"
		export CROSS_COMPILE="${xarch% *}-"
		[ -n "$xlang" ] && export BUILD_LANGUAGES="$xlang"

		# sometimes buildgcc fails for like no reason. try twice.
		make -C "$cbdir" crossgcc-${_xarch%-*} $makeargs || \
		    make -C "$cbdir" crossgcc-${_xarch%-*} $makeargs || \
		    $err "!mkxgcc $project/$xtree '${_xarch%-*}' '$makeargs'"
	done; return 0
}

check_defconfig()
{
	[ -f "$defconfig" ] || $dry $err "$project/$target: missing defconfig"

	dest_dir="$elfdir/$target/${defconfig#"$target_dir/config/"}"
	$dry elfcheck || return 1 # skip build if a previous one exists

	$dry x_ mkdir -p "$dest_dir"
}

elfcheck()
{
	# TODO: very hacky check. do it properly (based on build.list)
	for elftest in "$dest_dir"/*; do
		[ -e "$elftest" ] && e "$elftest" f && return 1
	done; return 0
}

handle_makefile()
{
	$dry check_makefile "$cdir" && x_ make clean -C "$cdir"
	[ -f "$defconfig" ] && x_ cp "$defconfig" "$cdir/.config"
	[ -n "$mode" ] || [ -n "$btype" ] || $dry make -C \
	    "$cdir" silentoldconfig || make -C "$cdir" oldconfig || :

	run_make_command || $err "handle_makefile $cdir: no makefile!"

	_copy=".config" && [ "$mode" = "savedefconfig" ] && _copy="defconfig"
	[ "${mode%config}" = "$mode" ] || $dry x_ cp "$cdir/$_copy" "$defconfig"

	[ -e "$cdir/.git" ] && [ "$project" = "u-boot" ] && \
	    [ "$mode" = "distclean" ] && $dry x_ git -C "$cdir" clean -fdx; :
}

run_make_command()
{
	[ -z "$premake" ] || [ -n "$mode" ] || $premake || $err "!$premake"

	$dry check_cmake "$cdir" && [ -z "$mode" ] && $dry check_autoconf \
	    "$cdir"; $dry check_makefile "$cdir" || return 1

	$dry make -C "$cdir" $mode -j$XBMK_THREADS $makeargs \
	    || $err "$cdir mk$mode"
	[ -z "$mkhelper" ] || [ -n "$mode" ] || $mkhelper || $err "!$mkhelper"

	[ "$mode" = "clean" ] && $dry make -C "$cdir" distclean || :; return 0
}

check_cmake()
{
	[ -z "$cmakedir" ] || $dry check_makefile "$1" || cmake -B "$1" \
	    "$1/$cmakedir" || $dry check_makefile "$1" || $err \
	    "$1: !cmk $cmakedir"
	[ -z "$cmakedir" ] || $dry check_makefile "$1" || \
	    $err "check_cmake $1: can't generate Makefile"; return 0
}

check_autoconf()
{
	(
	cd "$1" || $err "!cd $1"
	[ -f "bootstrap" ] && x_ ./bootstrap $bootstrapargs
	[ -f "autogen.sh" ] && x_ ./autogen.sh $autogenargs
	[ -f "configure" ] && x_ ./configure $autoconfargs; return 0
	) || $err "can't bootstrap project: $1"
}

check_makefile()
{
	[ -f "$1/Makefile" ] || [ -f "$1/makefile" ] || \
	    [ -f "$1/GNUmakefile" ] || return 1; return 0
}

copy_elf()
{
	[ -f "$listfile" ] && x_ mkdir -p "$dest_dir" && while read -r f; do
		[ -f "$cdir/$f" ] && x_ cp "$cdir/$f" "$dest_dir"
	done < "$listfile"; x_ make clean -C "$cdir"
}

main $@
e "$mkhelpercfg" f missing && mkhelpercfg="$TMPDIR/mkhelper.cfg" && x_ \
    touch "$mkhelpercfg"
. "$mkhelpercfg"
handle_project