#!/bin/bash

function_exists()
{
    local FUNCTION_NAME=$1

    [ -z "$FUNCTION_NAME" ] && return 1

    declare -F "$FUNCTION_NAME" > /dev/null 2>&1

    return $?
}

unset -f hvpatch_pre
unset -f hvconfig_pre
unset -f hvconfig_cache
unset -f hvconfig_post
unset -f hvbuild_post

ipkg_decompress_package()
{
    echo "Decompressing package"
    decompress_package ${PACKAGE}

    local DECOMPRESSED_DIRNAME=$(static_decompressed_dirname ${PACKAGE})

    # Rename the decompressed package as per the package name if necessary
    if [ "x${DECOMPRESSED_DIRNAME}" != "x${PACKAGE}" ]; then
        mv -v ${LFS_TMP}/${DECOMPRESSED_DIRNAME} ${LFS_TMP}/${PACKAGE}
    fi

    # Displaying package source size in log file
    echo "  Source size:" $(du -h -s ${LFS_TMP}/${PACKAGE} | awk '{ print $1 }') 1>> ${LFS_LOG_FILE}

    # Removing old build directory (if any)
    if [ -d ${LFS_TMP}/${PACKAGE}-build ]; then
        echo "Removing old build directory"
	rm -rf ${LFS_TMP}/${PACKAGE}-build
    fi

    # Creating build directory
    mkdir -v ${LFS_TMP}/${PACKAGE}-build
}

# Default configure function
hvconfig()
{
    if [ "x${IPKG_MODE}" = "xacnb" -o "x${IPKG_MODE}" = "xpm" ]; then
        # Broken autoconf package that must build in source dir, or Perl module.
        cd ${LFS_TMP}/${PACKAGE}
    else
        # Standard autoconf mode
        cd ${LFS_TMP}/${PACKAGE}-build
    fi

    if [ "x${IPKG_MODE}" = "xpm" ]; then
        # Configure Perl module.
        # The option "-n" is used to avoid having to answer a question and
        # accept the default configuration.
        perl Makefile.PL -n ${CONFIGURE_OPTS}
    else
        # Standard configure script
        ${LFS_TMP}/${PACKAGE}/configure ${CONFIGURE_OPTS}
    fi
}

# Default build function
hvbuild()
{
    if [ "x${IPKG_MODE}" = "xacnb" -o \
        "x${IPKG_MODE}" = "xnoac" -o \
        "x${IPKG_MODE}" = "xpm" ]; then
        # Broken autoconf package that must build in source dir, or Perl module.
        cd ${LFS_TMP}/${PACKAGE}
    fi

    ${HVMAKE}
    ${HVMAKE} install
}

# Default patch applying function
hvpatch()
{
    # Applying patches (if any)
    apply_patches ${PACKAGE}
}

ipkg_finish()
{
    # Make sure to return to scripts directory
    cd ${SCRDIR}

    # Displaying package build size in log file
    BUILD_SIZE=$(du -h -s -c ${LFS_TMP}/${PACKAGE} ${LFS_TMP}/${PACKAGE}-build | grep total | awk '{ print $1 }')
    echo "  Build size : ${BUILD_SIZE}" 1>> ${LFS_LOG_FILE}

    # Some scripts need to preserve the source or build directory. They can
    # do so by renaming them.
    if [ -d ${LFS_TMP}/${PACKAGE} ]; then
	# Removing source directory
        echo "Removing source directory"
	rm -rf ${LFS_TMP}/${PACKAGE}
    fi
    if [ -d ${LFS_TMP}/${PACKAGE}-build ]; then
	# Removing build directory
        echo "Removing build directory"
	rm -rf ${LFS_TMP}/${PACKAGE}-build
    fi
}

# This is the main function doing all the work
# Arg #1: alternate script name (optional)
ipkg_script()
{
    if [ $# -eq 1 ]; then
        # Use supplied script name
        PACKAGE_DEF=${SCRDIR}/pkg/${1}
    else
        # Use default script name
        PACKAGE_DEF=${SCRDIR}/pkg/$(get_pkg_name ${PACKAGE})

    fi

    ipkg_decompress_package

    if [ -f ${PACKAGE_DEF} ]; then
        echo "Load custom package functions and definitions from ${PACKAGE_DEF}"
        source ${PACKAGE_DEF}
    fi

    # Execute pre-patch function if applicable
    if function_exists hvpatch_pre ; then
        echo "Running patch pre-script"
        hvpatch_pre
    fi

    hvpatch

    # Execute pre-configure function if applicable
    if function_exists hvconfig_pre ; then
        echo "Running configure pre-script"
        hvconfig_pre
    fi

    # Execute config-cache function if applicable
    if function_exists hvconfig_cache ; then
        echo "Running configure cache script"
        hvconfig_cache
        CONFIGURE_OPTS="\
            ${CONFIGURE_OPTS} \
            --cache-file=${LFS_TMP}/${PACKAGE}-build/config.cache"
    fi

    if [ "x${IPKG_MODE}" != "xnoac" ]; then
        # Add option --disable-dependency-tracking if supported
        if cat ${LFS_TMP}/${PACKAGE}/configure | \
            grep "disable-dependency-tracking" 1> /dev/null 2>&1; then
            CONFIGURE_OPTS="\
                ${CONFIGURE_OPTS} \
                --disable-dependency-tracking"
        fi
    fi

    ipkg_display_build_infos

    if [ "x${IPKG_MODE}" = "xnoac" ]; then
        echo "Not calling configure because ${PACKAGE} has no configure script"
    else
        hvconfig
    fi

    # Execute post-configure function if applicable
    if function_exists hvconfig_post ; then
        echo "Running configure post-script"
        hvconfig_post
    fi

    hvbuild

    # Execute post-build function if applicable
    if function_exists hvbuild_post ; then
        echo "Running build post-script"
        hvbuild_post
    fi

    ipkg_finish
}