#!/bin/sh -efu
#
# Copyright (C) 2008  Alexey Tourbin <at@altlinux.org>
#
# 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; either version 2 of the License, or
# (at your option) any later version.

. /usr/lib/rpm/functions
. /usr/lib/rpm/find-package

[ -n "${RPM_LIBDIR-}" ] || RPM_LIBDIR=`rpm --eval %_libdir`
PKG_CONFIG_PATH=$RPM_LIBDIR/pkgconfig:/usr/share/pkgconfig
[ -z "${RPM_BUILD_ROOT-}" ] ||
PKG_CONFIG_PATH=$RPM_BUILD_ROOT$RPM_LIBDIR/pkgconfig:$RPM_BUILD_ROOT/usr/share/pkgconfig:$PKG_CONFIG_PATH
export PKG_CONFIG_PATH

PkgconfigCflags()
{
	local f="$1"; shift
	local pc_files
	if [ -n "${RPM_BUILD_ROOT-}" ]; then
		pc_files=$(set +f; ls "$RPM_BUILD_ROOT$RPM_LIBDIR/pkgconfig"/*.pc 2>/dev/null ||:)
	else
		pc_files=$(rpmquery -f "$f" --list 2>/dev/null |
				egrep "^$RPM_LIBDIR/pkgconfig/[^/]+[.]pc\$" || [ $? = 1 ])
	fi
	[ -n "$pc_files" ] || return 0
	local pc
	for pc in $pc_files; do
		pkg-config --enable-recursion --cflags "$pc" ||
			Fatal "$pc: pkg-config failed"
	done
}

Cflags()
{
	local f="$1"; shift
	local cflags
	cflags=$(PkgconfigCflags "$f")
	set -- $cflags -I/usr/include -I${f%/*} -I${f%/*/*} -I${f%/*/*/*}
	local cf
	for cf; do
		case $cf in
			-D?*) echo $cf ;;
		esac
	done
	for cf; do
		[ -n "${RPM_BUILD_ROOT-}" ] || continue
		case $cf in
			-I/*) echo -I$RPM_BUILD_ROOT${cf#-I} ;;
		esac
	done
	for cf; do
		case $cf in
			-I/*) echo $cf ;;
		esac
	done
}

cpp=
IncludedFiles()
{
	local f="$1"; shift

	if [ -z "$cpp" ]; then
		cpp=/usr/bin/${RPM_ARCH:-noarch}-alt-linux-cpp
		[ -x "$cpp" ] || cpp=/usr/bin/cpp
		[ -z "${GCC_VERSION-}" ] || cpp=$cpp-$GCC_VERSION
		Debug "cpp=$cpp"
	fi

	cflags=$(Cflags "$f")
	Debug "$f: cflags:" $cflags

	if ! out=$("$cpp" -w -x c++ $cflags "$f"); then
		Warning "$f: cpp failed"
		return 0
	fi
	echo "$out" |grep '^#' |awk -v prog="$PROG" -v hdr="$f" '
		# info cpp "Preprocessor Output"
		BEGIN {
			SP = 0
			Stack[SP] = hdr
		}
		function filename(f) {
			if (!sub(/^"\//, "/", f) ||
			    !sub(/"$/, "", f))
				printf "%s: %s: bad path %s\n",
					prog, hdr, f >"/dev/stderr"
			return f
		}
		function Push(f) {
			f=filename(f)
			Stack[++SP]=f
			if (SP==1)
				print f
		}
		function Pop(f) {
			f=filename(f)
			if (f != Stack[--SP])
				printf "%s: %s: expected pop %s, got pop %s\n",
					prog, hdr, Stack[SP], f >"/dev/stderr"
		}
		$4==1 { Push($3) }
		$4==2 { Pop($3) }
		END {
			if (SP > 0)
				printf "%s: %s: non-empty stack, top %s\n",
					prog, hdr, Stack[SP] >"/dev/stderr"
		}'

}

CppReq()
{
	local f="$1"; shift
	local files
	files=$(IncludedFiles "$f")
	[ -n "$files" ] || return 0
	local RPM_FINDPACKAGE_HOST_PKG_NAMES=1
	local inc
	echo "$files" |while read -r inc; do
		FindPackage "$f" "${inc#${RPM_BUILD_ROOT-}}"
	done
}

ArgvFileAction CppReq "$@"