Now that we have string-encodable game parameters, let's support a

command-line argument which is either a set of parameters or a
params+seed game ID.

[originally from svn r4234]

gtk.c

@@ -762,7 +762,7 @@ static void add_menu_separator(GtkContainer *cont)
     gtk_widget_show(menuitem);
 }
 
-static frontend *new_window(void)
+static frontend *new_window(char *game_id, char **error)
 {
     frontend *fe;
     GtkBox *vbox;
@@ -774,6 +774,14 @@ static frontend *new_window(void)
 
     time(&t);
     fe->me = midend_new(fe, &t, sizeof(t));
+    if (game_id) {
+        *error = midend_game_id(fe->me, game_id, FALSE);
+        if (*error) {
+            midend_free(fe->me);
+            sfree(fe);
+            return NULL;
+        }
+    }
     midend_new_game(fe->me);
 
     fe->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
@@ -944,8 +952,16 @@ static frontend *new_window(void)
 
 int main(int argc, char **argv)
 {
+    char *pname = argv[0];
+    char *error;
+
     gtk_init(&argc, &argv);
-    (void) new_window();
+
+    if (!new_window(argc > 1 ? argv[1] : NULL, &error)) {
+        fprintf(stderr, "%s: %s\n", pname, error);
+        return 1;
+    }
+
     gtk_main();
 
     return 0;

midend.c

@@ -373,9 +373,62 @@ config_item *midend_get_config(midend_data *me, int which, char **wintitle)
     return NULL;
 }
 
+char *midend_game_id(midend_data *me, char *id, int def_seed)
+{
+    char *error, *par, *seed;
+    game_params *params;
+
+    seed = strchr(id, ':');
+
+    if (seed) {
+        /*
+         * We have a colon separating parameters from game seed. So
+         * `par' now points to the parameters string, and `seed' to
+         * the seed string.
+         */
+        *seed++ = '\0';
+        par = id;
+    } else {
+        /*
+         * We only have one string. Depending on `def_seed', we
+         * take it to be either parameters or seed.
+         */
+        if (def_seed) {
+            seed = id;
+            par = NULL;
+        } else {
+            seed = NULL;
+            par = id;
+        }
+    }
+
+    if (par) {
+        params = decode_params(par);
+        error = validate_params(params);
+        if (error) {
+            free_params(params);
+            return error;
+        }
+        free_params(me->params);
+        me->params = params;
+    }
+
+    if (seed) {
+        error = validate_seed(me->params, seed);
+        if (error)
+            return error;
+
+        sfree(me->seed);
+        me->seed = dupstr(seed);
+        me->fresh_seed = TRUE;
+    }
+
+    return NULL;
+}
+
 char *midend_set_config(midend_data *me, int which, config_item *cfg)
 {
-    char *error, *p;
+    char *error;
     game_params *params;
 
     switch (which) {
@@ -393,36 +446,9 @@ char *midend_set_config(midend_data *me, int which, config_item *cfg)
 	break;
 
       case CFG_SEED:
-
-        /*
-         * The game ID will often (in fact, mostly) have a prefix
-         * containing a string-encoded parameter specification
-         * followed by a colon. So first find the colon, and then
-         * split the string up.
-         */
-        p = strchr(cfg[0].sval, ':');
-
-        if (p) {
-            *p++ = '\0';               /* p now points to game seed */
-            params = decode_params(cfg[0].sval);
-            error = validate_params(params);
-            if (error) {
-                free_params(params);
-                return error;
-            }
-            free_params(me->params);
-            me->params = params;
-        } else
-            p = cfg[0].sval;
-
-	error = validate_seed(me->params, p);
+        error = midend_game_id(me, cfg[0].sval, TRUE);
 	if (error)
 	    return error;
-
-	sfree(me->seed);
-	me->seed = dupstr(p);
-	me->fresh_seed = TRUE;
-
 	break;
     }
 

puzzles.h

@@ -127,6 +127,7 @@ int midend_wants_statusbar(midend_data *me);
 enum { CFG_SETTINGS, CFG_SEED };
 config_item *midend_get_config(midend_data *me, int which, char **wintitle);
 char *midend_set_config(midend_data *me, int which, config_item *cfg);
+char *midend_game_id(midend_data *me, char *id, int def_seed);
 
 /*
  * malloc.c

windows.c

@@ -7,6 +7,7 @@
 
 #include <stdio.h>
 #include <assert.h>
+#include <ctype.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <time.h>
@@ -309,7 +310,7 @@ void activate_timer(frontend *fe)
     }
 }
 
-static frontend *new_window(HINSTANCE inst)
+static frontend *new_window(HINSTANCE inst, char *game_id, char **error)
 {
     frontend *fe;
     int x, y;
@@ -322,6 +323,15 @@ static frontend *new_window(HINSTANCE inst)
     time(&t);
     fe->me = midend_new(fe, &t, sizeof(t));
 
+    if (game_id) {
+        *error = midend_game_id(fe->me, game_id, FALSE);
+        if (*error) {
+            midend_free(fe->me);
+            sfree(fe);
+            return NULL;
+        }
+    }
+
     fe->inst = inst;
     midend_new_game(fe->me);
     midend_size(fe->me, &x, &y);
@@ -1008,6 +1018,7 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show)
 {
     MSG msg;
+    char *error;
 
     InitCommonControls();
 
@@ -1028,7 +1039,15 @@ int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show)
 	RegisterClass(&wndclass);
     }
 
-    new_window(inst);
+    while (*cmdline && isspace(*cmdline))
+	cmdline++;
+
+    if (!new_window(inst, *cmdline ? cmdline : NULL, &error)) {
+	char buf[128];
+	sprintf(buf, "%.100s Error", game_name);
+	MessageBox(NULL, error, buf, MB_OK|MB_ICONERROR);
+	return 1;
+    }
 
     while (GetMessage(&msg, NULL, 0, 0)) {
 	DispatchMessage(&msg);