#! /bin/bash

################################################################################
# Prepare
################################################################################

# Set up shell
set -x                          # Output commands
set -e                          # Abort on errors



################################################################################
# Build
################################################################################

if [ -z "${LUA_DIR}" -o "${LUA_DIR}" = 'BUILD' ]; then
    echo "BEGIN MESSAGE"
    echo "Building Lua..."
    echo "END MESSAGE"

    # Set locations
    THORN=lua
    NAME=lua-5.2.2
    SRCDIR=$(dirname $0)
    BUILD_DIR=${SCRATCH_BUILD}/build/${THORN}
    INSTALL_DIR=${SCRATCH_BUILD}/external/${THORN}
    DONE_FILE=${SCRATCH_BUILD}/done/${THORN}
    LUA_DIR=${INSTALL_DIR}

(
    exec >&2                    # Redirect stdout to stderr
    set -x                      # Output commands
    set -e                      # Abort on errors
    cd ${SCRATCH_BUILD}
    if [ -e ${DONE_FILE} -a ${DONE_FILE} -nt ${SRCDIR}/dist/${NAME}.tar.gz \
                         -a ${DONE_FILE} -nt ${SRCDIR}/lua.sh ]
    then
        echo "LUA: The enclosed lua library has already been built; doing nothing"
    else
        echo "LUA: Building enclosed lua library"

        # Should we use gmake or make?
        MAKE=$(gmake --help > /dev/null 2>&1 && echo gmake || echo make)
        # Should we use gtar or tar?
        TAR=$(gtar --help > /dev/null 2> /dev/null && echo gtar || echo tar)

        # Set up environment
        unset LIBS

        echo "LUA: Preparing directory structure..."
        mkdir build external done 2> /dev/null || true
        rm -rf ${BUILD_DIR} ${INSTALL_DIR}
        mkdir ${BUILD_DIR} ${INSTALL_DIR}

        echo "LUA: Unpacking archive..."
        pushd ${BUILD_DIR}
        ${TAR} xzf ${SRCDIR}/dist/${NAME}.tar.gz

        echo "LUA: Configuring..."
        target="generic"
        # Check whether we are running on Windows
        if perl -we 'exit (`uname` !~ /^CYGWIN/)'; then
            target="mingw"
        fi
        # Check whether we are running on MacOS
        if perl -we 'exit (`uname` !~ /^Darwin/)'; then
            target="macosx"
        fi
        # Check whether we are running on Linux
        if perl -we 'exit (`uname` !~ /^Linux/)'; then
            target="linux"
        fi
        cd ${NAME}

        perl -p -i -e "s:^CFLAGS=(.*):CFLAGS=\$1 -I${LIBREADLINE_INC_DIRS} -L${LIBREADLINE_LIB_DIRS} -I${LIBNCURSES_INC_DIRS} -L${LIBNCURSES_LIB_DIRS}:g" src/Makefile
        perl -p -i -e 's:\$\(CC\) -o \$@:\$(CC) -o \$@ \$(CFLAGS):g' src/Makefile
        perl -p -i -e 's:(-Wl,-E -ldl -lreadline):\1 -lncurses:' src/Makefile
        
        echo "LUA: Building (${target}) ..."
        ${MAKE} $target
        
        echo "LUA: Installing..."
        ${MAKE} install INSTALL_TOP=${INSTALL_DIR}
        popd
        
        echo "LUA: Cleaning up..."
        rm -rf ${BUILD_DIR}

        date > ${DONE_FILE}
        echo "LUA: Done."
    fi
)

    if (( $? )); then
        echo 'BEGIN ERROR'
        echo 'Error while building LUA. Aborting.'
        echo 'END ERROR'
        exit 1
    fi

fi


################################################################################
# Configure Cactus
################################################################################

# Set options
LUA_INC_DIRS="${LUA_DIR}/include"
LUA_LIB_DIRS="${LUA_DIR}/lib"
LUA_LIBS="lua"

# Pass options to Cactus
echo "BEGIN MAKE_DEFINITION"
echo "HAVE_LUA     = 1"
echo "LUA_DIR      = ${LUA_DIR}"
echo "LUA_INC_DIRS = ${LUA_INC_DIRS}"
echo "LUA_LIB_DIRS = ${LUA_LIB_DIRS}"
echo "LUA_LIBS     = ${LUA_LIBS}"
cat ${SRCDIR}/src/make.lua.rules
echo "END MAKE_DEFINITION"

echo 'INCLUDE_DIRECTORY $(LUA_INC_DIRS) $(CURL_INC_DIRS) $(LIBXML2_INC_DIRS)'
echo 'LIBRARY_DIRECTORY $(LUA_LIB_DIRS) $(CURL_LIB_DIRS) $(LIBXML2_LIB_DIRS)'
echo 'LIBRARY           $(LUA_LIBS) $(CURL_LIBS) $(LIBXML2_LIBS)'