#! /bin/bash

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

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



################################################################################
# Search
################################################################################

if [ -z "${GSL_DIR}" ]; then
    echo "BEGIN MESSAGE"
    echo "GSL selected, but GSL_DIR not set.  Checking some places..."
    echo "END MESSAGE"
    
    FILES="include/gsl/gsl_math.h"
    DIRS="/usr /usr/local /usr/local/gsl /usr/local/packages/gsl /usr/local/apps/gsl ${HOME} c:/packages/gsl"
    for file in $FILES; do
        for dir in $DIRS; do
            if test -r "$dir/$file"; then
                GSL_DIR="$dir"
                break
            fi
        done
    done
    
    if [ -z "$GSL_DIR" ]; then
        echo "BEGIN MESSAGE"
        echo "GSL not found"
        echo "END MESSAGE"
    else
        echo "BEGIN MESSAGE"
        echo "Found GSL in ${GSL_DIR}"
        echo "END MESSAGE"
    fi
fi



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

if [ -z "${GSL_DIR}" ]; then
    echo "BEGIN MESSAGE"
    echo "Building GSL..."
    echo "END MESSAGE"
    
    # Set locations
    NAME=gsl-1.12
    SRCDIR=$(dirname $0)
    INSTALL_DIR=${SCRATCH_BUILD}
    GSL_DIR=${INSTALL_DIR}/${NAME}

    # Set up environment
    unset LIBS
    unset MAKEFLAGS
    if echo '' ${ARFLAGS} | grep 64 > /dev/null 2>&1; then
        export OBJECT_MODE=64
    fi
    
(
    exec >&2                    # Redirect stdout to stderr
    set -x                      # Output commands
    set -e                      # Abort on errors
    cd ${INSTALL_DIR}
    if [ -e done-${NAME} -a done-${NAME} -nt ${SRCDIR}/dist/${NAME}.tar.gz \
                         -a done-${NAME} -nt ${SRCDIR}/GSL.sh ]
    then
        echo "GSL: The enclosed GSL library has already been built; doing nothing"
    else
        echo "GSL: Building enclosed GSL library"
        
        # Should we use gmake or make?
        MAKE=$(gmake --help > /dev/null 2>&1 && echo gmake || echo make)
        
        echo "GSL: Unpacking archive..."
        rm -rf build-${NAME}
        mkdir build-${NAME}
        pushd build-${NAME}
        # Should we use gtar or tar?
        TAR=$(gtar --help > /dev/null 2> /dev/null && echo gtar || echo tar)
        ${TAR} xzf ${SRCDIR}/dist/${NAME}.tar.gz
        popd
        
        echo "GSL: Configuring..."
        rm -rf ${NAME}
        mkdir ${NAME}
        pushd build-${NAME}/${NAME}
        ./configure --prefix=${GSL_DIR}
        
        echo "GSL: Building..."
        ${MAKE}
        
        echo "GSL: Installing..."
        ${MAKE} install
        popd
        
        echo 'done' > done-${NAME}
        echo "GSL: Done."
    fi
)

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

fi



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

# Set options
if [ "${GSL_DIR}" != '/usr' -a "${GSL_DIR}" != '/usr/local' ]; then
    GSL_INC_DIRS="${GSL_DIR}/include"
    GSL_LIB_DIRS="${GSL_DIR}/lib"
fi
: ${GSL_LIBS='gsl gslcblas'}

# Pass options to Cactus
echo "BEGIN MAKE_DEFINITION"
echo "HAVE_GSL     = 1"
echo "GSL_DIR      = ${GSL_DIR}"
echo "GSL_INC_DIRS = ${GSL_INC_DIRS}"
echo "GSL_LIB_DIRS = ${GSL_LIB_DIRS}"
echo "GSL_LIBS     = ${GSL_LIBS}"
echo "END MAKE_DEFINITION"

echo 'INCLUDE_DIRECTORY $(GSL_INC_DIRS)'
echo 'LIBRARY_DIRECTORY $(GSL_LIB_DIRS)'
echo 'LIBRARY           $(GSL_LIBS)'