configure

#!/bin/bash
prefix=/opt
prefix_set=false
pkg_config_path=''
pkg_config_path_set=false
common_packages=" mono;2.6"

usage ()
{
        echo "Usage : configure [OPTION]... [--config=CONFIG]"
        echo
        echo "Options:"
        echo "  --prefix=PREFIX         install architecture-independent files in PREFIX"
        echo "                          [/usr/local]"
        echo
}
check_package ()
{
        name=`echo $1 | cut -d\; -f1`
        version=`echo $1 | cut -d\; -f2`
        echo -n "Checking for package '$name'.." | tee -a config.log
        pkg-config --atleast-version=$version $name
        if [ $? -ne 0 ]; then
                echo " ERROR: Package named '$name' >= $version not found." | tee -a config.log
                echo "Try adjusting your PKG_CONFIG_PATH environment variable." | tee -a config.log
                return 1
        fi
        echo " found." | tee -a config.log
}

check_required_packages ()
{
        echo "Looking for required packages" | tee config.log
        var=required_packages_$config
        for pkg in $common_packages ${!var}; do
                check_package $pkg
                retval=$?
                [ $retval -ne 0 ] && return $retval
        done
        return 0
}

check_pkg_config_path ()
{
    if $pkg_config_path_set ; then
        return 0
    fi

    if $prefix_set ; then
        pkg_config_path=$prefix/lib/pkgconfig
        return 0
    fi

    pkg_config_path=`pkg-config --variable=pc_path pkg-config |  awk -F":" '{print $1}'`
    if [[ $pkg_config_path == '' ]]; then
	pkg_config_path=$prefix/lib/pkgconfig
    fi
    return 0;
}

check_darwin ()
{
        # This is hacky convience thing for Mac users that just installed vanialla Mono without setting up env
        # that don't have PKG_CONFIG_PATH defined. 
        unamestr=`uname`
        if [[ "$unamestr" == 'Darwin' && -n "${PKG_CONFIG_PATH-x}" && -d /Library/Frameworks/Mono.framework/ ]]; then
                echo "adding default Mono installation to PKG_CONFIG_PATH. Override by setting PKG_CONFIG_PATH"
                export PKG_CONFIG_PATH=/Library/Frameworks/Mono.framework/Versions/Current/lib/pkgconfig/
        fi        
}

while test x$1 != x; do
                case $1 in
                --prefix=*)
                                prefix=`echo $1 | sed 's/--prefix=//'`
                                prefix_set=true
                                ;;
                --prefix)
                                shift
                                prefix=$1
                                prefix_set=true
                                ;;
                --pkg_config_path=*)
                                pkg_config_path=`echo $1 | sed 's/--pkg_config_path=//'`
                                pkg_config_path_set=true
                                ;;
                --pkg_config_path)
                                shift
                                pkg_config_path=$1
                                pkg_config_path_set=true
                                ;;
                --help)
                        usage
                        exit
                        ;;
                *)
                        echo Unknown argument $1 >&2
                        usage
                        exit 1
                        ;;
                esac
                shift
done

check_darwin
check_required_packages
check_pkg_config_path

[ $? -eq 1 ] && exit 1

echo "prefix=$prefix" > config.make
echo "pkg_config_path=$pkg_config_path" >> config.make

echo
echo "$PACKAGE has been configured with "
echo "        prefix = $prefix"
echo "        pkg_config_path = $pkg_config_path"
echo