Haxe macro custom generator example

build.hxml

-cp src
-main Main
--macro YourGenerator.use()

Main.hx

class Main {
    static function main() {
		trace("Hello world");
    }
}

YourGenerator.hx

import haxe.macro.Context;
import haxe.macro.Type;

class YourGenerator {
	static public function use() {
		Context.onGenerate(generate);
	}
	
	static function generate(types:Array<Type>) {
		// types contains all the compiled types, see http://api.haxe.org/haxe/macro/Type.html
		// Typically you now do something like this:
		
		for (type in types ){
			switch(type) {
				case TInst(c, _):
					trace('Generating class $c');
				case TEnum(en, _):
					trace('Generating enum $en');
				case TAbstract(a, _):
					trace('Generating abstract $a');
				case TType(t, _):
					// Ignore, I guess.
				case t:
					trace("This never happens: " + t);
			}
		}
	}
}