demos: space-shooter: Fix high score saving (#217)

Signed-off-by: Marek Maškarinec <marek@mrms.cz>

Author: marekmaskarinec

demos/space-shooter/enemy.um

@@ -73,9 +73,13 @@ fn handle*() {
 			if global::hp == 0 {
 				if global::score > global::hi {
 					global::hi = global::score
-					f := std::fopen("score", "w").item0
-					fprintf(f, "%d", global::hi)
-					std::fclose(f)
+					f, err := std::fopen(th::convPath("data://score"), "w")
+					if err.code != 0 {
+						printf("Error: Could not write high score\n")
+					} else {
+						fprintf(f, "%d", global::hi)
+						std::fclose(f)
+					}
 				}
 
 				enemies = []Enemy{}

demos/space-shooter/main.um

@@ -26,8 +26,8 @@ fn init*() {
 	sound::init()
 	global::hp = 10
 
-	f, err := std::fopen("score", "r")
-	if err.code != 0 {
+	f, err := std::fopen(th::convPath("data://score"), "r")
+	if err.code == 0 {
 		fscanf(f, "%d", &global::hi)
 		std::fclose(f)
 	}

demos/space-shooter/score

@@ -392,7 +392,7 @@ var (
 
 fn umth_conv_path(path: str): str
 //~~fn convPath
-// Expands the path to a platform specific path.
+// Evaluate path prefixes and return as a platform native path.
 fn convPath*(path: str): str {
 //~~
 	return umth_conv_path(path)