#!/usr/bin/ruby

#I'll put this in here as an example

# make a folder called src and a folder called build
# then put some c source code in src
# then run rub and watch it build

# of course you could make your own build.rb to build any project

#	ruby might not let you modify CONSTANTS
#	so put a $ in front of the name which makes
#	them global and not CONSTANT
$CC="gcc"
CFLAGS="-O1 -march=native -std=c11 -fmacro-prefix-map=src="
$EFLAGS = "" #extra flags
APPNAME="chess"
SRCDIR="src"
BUILDDIR="build"
INCLUDE=""
LIB="-lraylib"

#handle argument parsing yourself
def parse(arg)
	case arg
	when "clean"
		`rm build/*`
		`rm #{APPNAME}`
		exit(0)

	when "debug"
		$EFLAGS = "-DDEBUG"
		main

	when arg.split("=")[0] = "cc"
		$CC = arg.split("=")[1]
		main
	
	else
		error "unknown argument: #{arg}"
	end
end

#same as above
def args
	case ARGV.count
	when 0
		main
	when 1
		parse(ARGV[0])
	else
		puts "too many arguments"
	end
end

#main build function
def main
	if Dir.children(SRCDIR).count == 0
		error("src directory empty")
	end

	threads = []

	Dir.each_child(SRCDIR) {|x|
		threads << Thread.new {
			system("#{$CC} #{INCLUDE} #{CFLAGS} #{$EFLAGS} -c #{SRCDIR}/#{x} -o #{BUILDDIR}/#{File.basename(x, ".*") + ".o"}") if x.end_with?(".c")
			message "compiled: #{x}\n" if x.end_with?(".c")
		}
	}

	threads.each{ |t| t.join }

	#wait for each thread to finish 
	until threads.map { |t| t.alive? }.include?(false) 
	end

	build = Dir.each_child(BUILDDIR)
	o_files = []
	build.each { |s|
		o_files.append("#{BUILDDIR}/#{s}")
	}

	`#{$CC} #{CFLAGS} #{$EFLAGS} #{o_files.join(" ")} -o #{APPNAME} #{LIB}`
	exit(0)
end

#run some functions
args