thirdparty/ui for macOS (temporary)

vlib/compiler/cc.v

@@ -172,8 +172,20 @@ fn (v mut V) cc() {
 				libs += ' ' + path
 			} else {
 				println('$path not found... building module $imp')
-				os.system('$vexe build module vlib${os.path_separator}$imp_path')
+				if path.ends_with('vlib/ui.o') {
+					vdir := os.dir(vexe)
+					println('copying ui...')
+					os.cp('$vdir/thirdparty/ui/ui.o', path)
+					os.cp('$vdir/thirdparty/ui/ui.vh', v_modules_path +
+							'/vlib/ui.vh')
+					
+				}	else {
+					os.system('$vexe build module vlib${os.path_separator}$imp_path')
+				}
 			}	
+			if path.ends_with('vlib/ui.o') {
+				a << '-framework Cocoa -framework Carbon'
+			}
 		}
 	}
 	if v.pref.sanitize {

vlib/darwin/darwin.v

@@ -9,7 +9,8 @@ module darwin
 struct C.NSString { }
 
 // macOS and iOS helpers
-pub fn nsstring(s string) *C.NSString {
+//pub fn nsstring(s string) *C.NSString {
+pub fn nsstring(s string) voidptr {
 	// println('ns $s len=$s.len')
 	# return [ [ NSString alloc ] initWithBytesNoCopy:s.str  length:s.len
 	# encoding:NSUTF8StringEncoding freeWhenDone: false];

vlib/os/os.v

@@ -126,6 +126,15 @@ pub fn mv(old, new string) {
 	}
 }
 
+// TODO implement actual cp()
+pub fn cp(old, new string) {
+	$if windows {
+		panic('not implemented')
+	}	$else {
+		os.system('cp $old $new')
+	}	
+}
+
 fn vfopen(path, mode string) *C.FILE {
 	$if windows {
 		return C._wfopen(path.to_wide(), mode.to_wide())