#!/bin/sh -efu
#
# Copyright (C) 2008, 2011  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.

. @RPMCONFIGDIR@/functions
. @RPMCONFIGDIR@/find-package
. @RPMCONFIGDIR@/tmpdir.sh

[ -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="$1"; shift
	local pc_files
	pc_files=$(PackagedFiles "$f" |egrep "^$RPM_LIBDIR/pkgconfig/[^/]+[.]pc\$" || [ $? = 1 ])
	if [ -n "${RPM_BUILD_ROOT-}" ]; then
		pc_files=$(
			echo "$pc_files" |sed "s|^/|0 $RPM_BUILD_ROOT/|"
			set +f; ls "$RPM_BUILD_ROOT$RPM_LIBDIR/pkgconfig"/*.pc 2>/dev/null |sed 's|^/|1 /|')
		pc_files=$(echo "$pc_files" |sort -u -k2 |sort -n |cut -d' ' -f2-)
		Debug "pc_files:" $pc_files
	fi
	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
}

gcc=
cpp=
cxx=
cxx_test=
CppReq()
{
	local f="$1"; shift

	local srpm="${RPM_PACKAGE_NAME-}"
	[ -n "$srpm" ] || srpm=$(rpmquery --qf='%{SOURCERPM}' -f "$f" 2>/dev/null) || srpm=foo
	case "$srpm" in
		gcc | gcc-[345]* | gcc[345]* )
			[ -n "$gcc" ] ||
			Verbose "$f: $PROG disabled for gcc"
			gcc=$srpm
			return 0 ;;
	esac

	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 $cxx $cflags "$f"); then
		if [ -n "$cxx" -o "$cxx_test" = failed ]; then
			Warning "$f: cpp failed"
			return 0
		fi
		Info "$f: cpp failed, trying c++ mode"
		cxx='-x c++'
		if ! out=$("$cpp" -w $cxx $cflags "$f"); then
			if [ -z "$cxx_test" ]; then
				"$cpp" -w $cxx < /dev/null > /dev/null 2>&1 &&
					cxx_test=ok ||
					cxx_test=failed
			fi
			cxx=
			Warning "$f: cpp failed"
			return 0
		fi
	fi
	out=$(echo "$out" |sed -n '/^#.* "\//{s/"//g;p}')

	# Prepare the list of files in cpp output which are packaged in this supbackage.
	echo "$out" |cut -d' ' -f3 |
		xargs -r --delimiter='\n' stat -c '%d,%i %n' |
		sort -u >$tmpdir/out.f2i
	PackagedFiles "$f" |sed "s|^|${RPM_BUILD_ROOT-}|" |
		xargs -r --delimiter='\n' stat -c '%d,%i %n' |
		sort -u >$tmpdir/pkg.f2i
	join -o 1.2 $tmpdir/{out,pkg}.f2i >$tmpdir/pf

	echo "$out" |awk -v prog="$PROG" -v hdr="$f" -v pf="$tmpdir"/pf '
		# info cpp "Preprocessor Output"
		BEGIN {
			SP = 0
			SPmark = 0
			Stack[SP] = hdr
			while ((getline <pf) > 0)
				Packaged[$1] = 1
		}
		function Push(f) {
			if (SPmark == SP && !Printed[f]++)
				print f
			if (SPmark == SP && Packaged[f])
				SPmark++
			Stack[++SP] = f
		}
		function Pop(f) {
			if (f != Stack[--SP])
				printf "%s: %s: expected pop %s, got pop %s\n",
					prog, hdr, Stack[SP], f >"/dev/stderr"
			if (SPmark > SP)
				SPmark = SP
		}
		$4==1 { Push($3) }
		$4==2 { Pop($3) }
		END {
			if (SP > 0)
				printf "%s: %s: non-empty stack, top %s\n",
					prog, hdr, Stack[SP] >"/dev/stderr"
		}' |
	while read -r h; do
		RPM_FINDPACKAGE_HOST_PKG_NAMES=1
		FindPackage "$f" "${h#${RPM_BUILD_ROOT-}}"
	done
}

ArgvFileAction CppReq "$@"