user_data: use writeln and hashmap (associative arrays) on emscript…

…en target

build.zig

@@ -266,7 +266,7 @@ pub fn build(b: *Build) !void {
                 .betterC = if (std.mem.eql(u8, example, "user-data")) false else enable_betterC,
                 .dflags = &.{
                     "-w",
-                    "-preview=all",
+                    "-preview=rvaluerefparam",
                 },
                 // fixme: https://github.com/kassane/sokol-d/issues/1 - betterC works on darwin
                 .zig_cc = if (target.result.isDarwin() and !enable_betterC) false else enable_zigcc,

src/examples/user_data.d

@@ -7,52 +7,58 @@ import sglue = sokol.glue;
 
 extern (C):
 
-struct ExampleUserData {
+struct ExampleUserData
+{
     ubyte data;
     int[ubyte] map; // need druntime
 }
 
-void init() @safe {
+void init() @safe
+{
     sg.Desc gfx = {
         environment: sglue.environment,
-        logger: { func: &log.slog_func }
+        logger: {func: &log.slog_func}
     };
     sg.setup(gfx);
 }
 
-void frame_userdata(scope void* userdata) @trusted {
+void frame_userdata(scope void* userdata) @trusted
+{
     auto state = cast(ExampleUserData*) userdata;
 
     state.data++;
-    version (WebAssembly) {
-        // TODO support
+    version (D_BetterC)
+    {
+
     }
-    else {
-        if (state.data % 13 == 0) {
+    else
+    {
+        if (state.data % 13 == 0)
+        {
             state.map[state.data] = state.data * 13 / 3;
         }
-        if (state.data % 12 == 0 && state.data % 15 == 0) {
+        if (state.data % 12 == 0 && state.data % 15 == 0)
+        {
             state.map.clear();
         }
-    }
-    debug {
         import std.stdio : writeln;
-        try {
-            writeln(*state);
-        } catch (Exception) { }
+
+        writeln(*state);
     }
 
-    sg.Pass pass = { swapchain: sglue.swapchain };
+    sg.Pass pass = {swapchain: sglue.swapchain};
     sg.beginPass(pass);
     sg.endPass();
     sg.commit();
 }
 
-void cleanup() @safe {
+void cleanup() @safe
+{
     sg.shutdown();
 }
 
-void main() {
+void main()
+{
     auto userData = ExampleUserData(0, null);
     sapp.Desc runner = {
         window_title: "user-data.d",