nestedenums.d

#!opend test app.d
--- app.d
import std;
mixin template makeid(string[][] fields,alias INT=ubyte){
	static assert(INT.min==0, "I assume unsigned");
	enum string enumsmixin=(){
		string[] o;
		
		o~="enum allids{nil=INT(0),";
		INT i=INT(1);
		foreach(list;fields){
			o~="enum INT actaulmin(T:"~list.front~")="~i.to!string~";";
			o~="enum "~list.front~"{nil=INT(0),";
			list.popFront;
			foreach(s;list){
				o[0]~=s~"=INT("~i.to!string~"),";
				o[$-1]~=s~"=INT("~i.to!string~"),";
				i++;
			}
			o[$-1]~="}";
		}
		o[0]~="}";
		return o.join('\n');
	}();
	enum INT nil=INT(0);
	mixin(enumsmixin);
	enum string[] idnames=["nil"]~fields.map!(a=>a.drop(1)).join.array;
}

version(unittest){
	
	mixin makeid!([
		["wallsid","wall","ground","fakewall"],
		["actorsid","player","goblin","horse"],
		["weponsid","ax","sword"],
	]);
	
	unittest{
		//enumsmixin.writeln;
		6.to!allids.writeln;
		assert(cast(allids)weponsid.ax==allids.ax);
		idnames.writeln;
		idnames[weponsid.ax].writeln;
	}
}