fix(tcl-wasm): register magic:: Tcl commands after C initialization completes

magic_wasm_init() called Tclmagic_Init() and magicMainInit() but never
ran the command-registration loop in _magic_initialize(), so magic::tech,
magic::load, magic::gds and all other Magic commands were missing from
the Tcl interpreter.

Add TclmagicRegisterCommands() in tclmagic.c containing the
WindNextClient/WindGetCommandTable loop and call it from magic_wasm_init()
after magicMainInit() succeeds.

Also change magic_wasm_source_file() to use Tcl_EvalFile in MAGIC_WRAPPER
mode so scripts with magic:: commands are evaluated through the Tcl
interpreter instead of the plain text dispatcher.

magic/magicWasm.c

@@ -98,7 +98,18 @@ magic_wasm_init(void)
     }
 #endif
 
-    return magicMainInit(5, argv);
+    {
+	static int commandsRegistered = FALSE;
+	int rc = magicMainInit(5, argv);
+#ifdef MAGIC_WRAPPER
+	if (rc == 0 && !commandsRegistered)
+	{
+	    TclmagicRegisterCommands(magicinterp);
+	    commandsRegistered = TRUE;
+	}
+#endif
+	return rc;
+    }
 }
 
 EMSCRIPTEN_KEEPALIVE int
@@ -134,7 +145,6 @@ magic_wasm_run_command(const char *command)
 EMSCRIPTEN_KEEPALIVE int
 magic_wasm_source_file(const char *path)
 {
-    FILE *f;
     int status;
 
     status = magic_wasm_init();
@@ -144,27 +154,30 @@ magic_wasm_source_file(const char *path)
     if ((path == NULL) || (*path == '\0'))
 	return -1;
 
-    f = PaOpen((char *)path, "r", (char *)NULL, ".", (char *)NULL,
-	    (char **)NULL);
-    if (f == NULL)
-    {
-	TxError("Unable to open command file \"%s\".\n", path);
-	return -1;
-    }
-
-    /* Set the current point to the centre of the screen so that
-     * WindSendCommand routes all commands from the file to the layout
-     * window client, just as magic_wasm_run_command does for single
-     * commands.  Without this, commands arrive with point (0,0) and
-     * end up in the border/windClient context where most commands are
-     * unknown.
-     */
     TxSetPoint(GrScreenRect.r_xtop / 2, GrScreenRect.r_ytop / 2,
 	    WIND_UNKNOWN_WINDOW);
 
-    TxDispatch(f);
-    fclose(f);
-    return 0;
+#ifdef MAGIC_WRAPPER
+    /* In wrapper mode the file contains Tcl; evaluate it through the
+     * Tcl interpreter so that magic:: commands are dispatched via
+     * _tcl_dispatch just like magic_wasm_run_command does for strings. */
+    if (magicinterp == NULL)
+	return -1;
+    return Tcl_EvalFile(magicinterp, path);
+#else
+    {
+	FILE *f = PaOpen((char *)path, "r", (char *)NULL, ".", (char *)NULL,
+		(char **)NULL);
+	if (f == NULL)
+	{
+	    TxError("Unable to open command file \"%s\".\n", path);
+	    return -1;
+	}
+	TxDispatch(f);
+	fclose(f);
+	return 0;
+    }
+#endif
 }
 
 EMSCRIPTEN_KEEPALIVE void

tcltk/tclmagic.c

@@ -656,6 +656,37 @@ process_rlimit_startup_check(void)
 #endif /* HAVE_GETRLIMIT */
 }
 
+/*------------------------------------------------------*/
+/* Register magic:: commands with the Tcl interpreter.  */
+/* Called after Magic's C subsystems are fully		*/
+/* initialized (i.e. after magicMainInit returns 0)	*/
+/* so that WindNextClient / WindGetCommandTable return  */
+/* populated tables.					*/
+/*------------------------------------------------------*/
+
+void
+TclmagicRegisterCommands(Tcl_Interp *interp)
+{
+    WindClient client;
+    int n;
+    char keyword[100];
+    char *kwptr = keyword + 7;
+    const char * const *commandTable;
+
+    sprintf(keyword, "magic::");
+    client = (WindClient)NULL;
+    while ((client = WindNextClient(client)) != NULL)
+    {
+	commandTable = WindGetCommandTable(client);
+	for (n = 0; commandTable[n] != NULL; n++)
+	{
+	    sscanf(commandTable[n], "%s ", kwptr);
+	    Tcl_CreateCommand(interp, keyword, (Tcl_CmdProc *)_tcl_dispatch,
+			(ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
+	}
+    }
+}
+
 /*------------------------------------------------------*/
 /* Main startup procedure				*/
 /*------------------------------------------------------*/

tcltk/tclmagic.h

@@ -32,5 +32,7 @@ extern void MakeWindowCommand();
 
 extern const char *Tclmagic_InitStubsVersion;
 
+extern void TclmagicRegisterCommands(Tcl_Interp *interp);
+
 #endif	/* MAGIC_WRAPPER */
 #endif /* _MAGIC__TCLTK__TCLMAGIC_H */