configure

#!/bin/bash

#global consts
CONFIG_HPP="include/config.hpp"
PROG_DIR="std::string(getenv(\"HOME\")) + \"/local/$(basename $(pwd))\""
SCRIPT_NAME="configure"

#displays usage information and exits program
function usage {
	echo -e "\nusage: $SCRIPT_NAME [-d <program_dir>] [-h]\n"
	exit
}

#returns the absolute path of a relative reference
function absPath {
	if [ -d "$1" ]; then
		( cd "$1"; echo $(dirs -l +0))
	else
		( cd "$(dirname "$1")"; d=$(dirs -l +0); echo "${d%/}/${1##*/}" )
	fi
}

#checks that $1 is not empty or a flag
function isArg {
	if [[ $1 == -* ]] || [[ -z "$1" ]] ; then
		usage
	fi
}

#begin main

#get args
while ! [[ -z "$1" ]] ; do
	case $1 in
		"-d"|"--program-directory")
			shift
			isArg "$1"
			PROG_DIR="\"$(absPath "$1")\"" ;;
		"-h"|"--help")
			usage ;;
		*)
			usage ;;
	esac			
	shift
done		

#update config.hpp
echo "Updating $CONFIG_HPP..."
echo -e "\n#ifndef config_hpp" > $CONFIG_HPP
echo -e "#define config_hpp\n" >> $CONFIG_HPP
echo "#define CONFIG_PROG_WD_DIR $PROG_DIR;" >> $CONFIG_HPP
echo -e "\n#endif /* config_hpp */" >> $CONFIG_HPP