configure

#!/bin/sh

while getopts "hv:" arg; do
  case $arg in
    h)
      echo "Usage: configure [-h] [-v <Lua version>]"
      echo "<Lua version> : \"5.4\", \"5.3\", \"5.2\" or \"5.1\""
      exit 0
      ;;
    v)
      OPTLUAVERSION=$OPTARG
      echo "Selected Lua version: $OPTLUAVERSION"
      ;;
  esac
done

FIND=find
GREP=grep
DIRNAME=dirname
PKGCONFIG=pkg-config
LUAROCKS=luarocks
RED='\033[0;31m'
NOCOL='\033[0m'

LLVM_VERSION=`llvm-config --version | awk -F "." '{print $1}'`
echo "return $LLVM_VERSION" > examples/llvm_version.lua
if [ "$LLVM_VERSION" -lt "10" ] || [ "$LLVM_VERSION" -gt "17" ]; then
	echo "${RED}ERR${NOCOL} mewa is not tested with the LLVM version $LLVM_VERSION!"
	echo ""
fi

findLuaInclude() {
	local VERSION=$1
	local SEARCHPATH="$2"
	local FILE=`$FIND $SEARCHPATH -name luaconf.h | $GREP $VERSION`
	if [ x$FILE != 'x' ]; then
		local RESULT=`$DIRNAME $FILE`
		echo $RESULT
	fi
}

findLuaLib() {
	local VERSION=$1
	local SEARCHPATH="$2"
	local FILE=`$FIND $SEARCHPATH -name "liblua$VERSION.so"`
	if [ x$FILE != 'x' ]; then
		local RESULT=`$DIRNAME $FILE`
		echo $RESULT
	fi
}

findLuaBin() {
	local VERSION=$1
	local SEARCHPATH="$2"
	local RESULT=`$FIND $SEARCHPATH -type f -name "lua$VERSION"`
	if [ x$RESULT != 'x' ]; then
		echo $RESULT
	fi
}

writeLuaInclude() {
	local VERSION=$1
	local INCPATH=$2
	local LIBPATH=$3
	local BINPATH=$4
	local CMODPATH=$5
	echo "LUAVER   := $VERSION" > Lua.inc
	echo "LUAINC   := $INCPATH" >> Lua.inc
	echo "LUALIBDIR:= $LIBPATH" >> Lua.inc
	echo "LUABIN   := $BINPATH" >> Lua.inc
	echo "LUALIBS  := -llua$VERSION -L$LIBPATH" >> Lua.inc
	echo "CMODPATH := $CMODPATH" >> Lua.inc
}

writePlatformInclude() {
	UNAM=`uname -m -o`
	if [ "X$UNAM" = "Xi686 GNU/Linux" ]; then
		echo "TARGET	:= i686-pc-linux-gnu" > Platform.inc
	elif [ "X$UNAM" = "Xx86_64 GNU/Linux" ]; then
		echo "TARGET	:= x86_64-pc-linux-gnu" > Platform.inc
	else
		echo "TARGET	:= \"?? unknown, probing of 'target triple' in configure failed ??\"" > Platform.inc
		>&2 echo "Failed to determine target triple used for tests! Some tests with the interpreter will fail."
	fi
}

writeLuaModulePathsInclude() {
	local VERSION=$1
	$LUAROCKS --lua-version "$VERSION" path > LuaPath.inc
}

searchLuaVersionWithPkgConfig() {
	local VERSION=$1
	>&2 echo "Checking with pkg-config for version $VERSION ..."
	$PKGCONFIG --exists lua$VERSION
	if [ $? = 0 ]; then
		local LUAVERSION=`$PKGCONFIG --variable=V lua$VERSION`
		if [ x$LUAVERSION = 'x' ]; then
			LUAVERSION=`$PKGCONFIG --variable=version lua$VERSION`
		fi
		if [ x$LUAVERSION != 'x' ]; then
			local INCPATH="`$PKGCONFIG --variable=includedir lua$VERSION`/lua$VERSION"
			local LIBPATH=`$PKGCONFIG --variable=libdir lua$VERSION`
			local PREFIX=`$PKGCONFIG --variable=prefix lua$VERSION`
			local CMODPATH=`$PKGCONFIG --variable=INSTALL_CMOD lua$VERSION`
			if [ x$CMODPATH != 'x' ]; then
				>&2 echo "$PKGCONFIG --variable=INSTALL_CMOD lua$VERSION => $CMODPATH"
			else
				CMODPATH="$LIBPATH/lua/$VERSION"
			fi
			if [ x$INCPATH != 'x' ] && [ x$LIBPATH != 'x' ] && [ x$PREFIX != 'x' ] ; then
				local BINPATH="$PREFIX/bin/lua$VERSION"
				writeLuaInclude $VERSION $INCPATH $LIBPATH $BINPATH $CMODPATH
				writeLuaModulePathsInclude $VERSION
				>&2 echo "$PKGCONFIG --variable=includedir lua$VERSION => $INCPATH"
				>&2 echo "$PKGCONFIG --variable=libdir lua$VERSION => $LIBPATH"
				>&2 echo "$PKGCONFIG --variable=prefix lua$VERSION => $PREFIX, BINPATH=$BINPATH"
				>&2 echo "$PKGCONFIG --variable=version lua$VERSION => $LUAVERSION"
				>&2 echo ""
				>&2 echo "Wrote file Lua.inc:"
				>&2 cat Lua.inc
				writePlatformInclude
				>&2 echo ""
				>&2 echo "Wrote file Platform.inc:"
				>&2 cat Platform.inc
				exit 0
			fi
		fi
	fi
}

searchLuaWithPkgConfig() {
	if [ "x$OPTLUAVERSION" != "x" ]; then
		searchLuaVersionWithPkgConfig $OPTLUAVERSION
	else
		for VERSION in 5.4 5.3 5.2 5.1 ; do
			searchLuaVersionWithPkgConfig $VERSION
		done
	fi
}

searchLuaVersionWithRawFind() {
	local VERSION=$1
	>&2 echo "Raw search for version $VERSION ..."
	local INCPATH=`findLuaInclude $VERSION "/usr/local/include /usr/include"`
	local LIBPATH=`findLuaLib $VERSION "/usr/local/lib /usr/lib"`
	local BINPATH=`findLuaBin $VERSION "/usr/bin /usr/local/bin"`
	local CMODPATH="$LIBPATH/lua/$VERSION"
	if [ x$INCPATH != 'x' ] && [ x$LIBPATH != 'x' ]; then
		writeLuaInclude $VERSION $INCPATH $LIBPATH $BINPATH $CMODPATH
		writeLuaModulePathsInclude $VERSION
		>&2 echo "Lua include path = $INCPATH"
		>&2 echo "Lua library path = $LIBPATH"
		>&2 echo "Lua binary path = $BINPATH"
		>&2 echo "Lua version = $VERSION"
		>&2 echo "Lua cmod install path = $CMODPATH"
		>&2 echo ""
		>&2 echo "Wrote file Lua.inc:"
		>&2 cat Lua.inc
		writePlatformInclude
		>&2 echo ""
		>&2 echo "Wrote file Platform.inc:"
		>&2 cat Platform.inc
		exit 0
	fi
}

searchLuaWithRawFind() {
	if [ "x$OPTLUAVERSION" != "x" ]; then
		searchLuaVersionWithRawFind $OPTLUAVERSION
	else
		for VERSION in 5.4 5.3 5.2 5.1 ; do
			searchLuaVersionWithRawFind $VERSION
		done
	fi
}

searchLuaWithPkgConfig
>&2 echo "Failed to determine Lua package info with $PKGCONFIG, now searching with raw find ..."
searchLuaWithRawFind
if [ "x$OPTLUAVERSION" != "x" ]; then
	>&2 echo "Lua installation (version $OPTLUAVERSION) not found!"
else
	>&2 echo "Lua installation (version 5.1,5.2,5.3 or 5.4) not found!"
fi