#!/bin/sh
#
# Enable local models to link to GSL.
#
# Please run this script from BUILD_DIR, after ./configure,
# but before make.
#
# For OS X

# Please set the correct location of GSL:

# Fink
#export SW_INSTALL_DIR=/sw

# Macports
export SW_INSTALL_DIR=/opt/local

#############################
# Set directories
export INC=$SW_INSTALL_DIR/include
export LIB=$SW_INSTALL_DIR/lib

# Check for libgsl:
if [ ! -f $SW_INSTALL_DIR/lib/libgsl.dylib ]; then
    echo "$SW_INSTALL_DIR/lib/libgsl.dylib does not exist."
    echo "You may want to check where GSL is installed." 
    echo "Exiting."
    exit 1
fi

echo "Enabling local models to link to GSL."
echo "Adding -L${LIB} -lgsl -lgslcblas to HD_SHLIB_LIBS"
echo " and adding -I${INC} to HD_CXXFLAGS"

file=../Xspec/src/tools/initpackage/xspackage.tmpl
if [ -f $file ]; then
    echo " in file " $file
    
# This sed command finds the block beginning with HD_CXXFLAGS and 
# ending with a blank line. It then looks for lines in that block that
# do not contain a backslash (\) and that are not blank (blank lines are
# represented by ^$ ). There should be only one such line - the last. 
# The first command (s/$/ \\/) appends a space followed by a backslash 
# to the end of the line. The second command (// a\ etc.)
# appends the flag to include the include path on a new line.
# The second sed command is similar.

    sed -e '/HD_CXXFLAGS/,/^$/ {
    /\\/ !{
    /^$/ !{
    s/$/ \\/
    // a\
    \                      -I'$INC'
    }
    }
    }
    ' -e '/HD_SHLIB_LIBS/,/^$/ {
    /placeholder/ i\
    \                      -L'${LIB}' -lgsl -lgslcblas
    }
    ' $file > temp.tmpl

    echo "If this worked correctly, you should see them appended:" 

    sed -n -e '/HD_CXXFLAGS/,/^$/ p' -e '/HD_SHLIB_LIBS/,/^$/ p' temp.tmpl
    mv temp.tmpl $file
else
    echo "${file} does not exist. Please check that you are in BUILD_DIR."
fi
echo "Done!"