Introduce a mechanism by which calls to midend_supersede_game_desc()

can trigger a call to a front end notification function. Use this to
update the game ID permalink when Mines supersedes its game ID.

[originally from svn r9793]

1 files changed, 16 insertions, 0 deletions

diff --git a/emcc.c b/emcc.c
index 4116fd1..2a5f788 100644
--- a/emcc.c
+++ b/emcc.c
@@ -309,6 +309,15 @@ static void update_permalinks(void)
     sfree(seed);
 }
 
+/*
+ * Callback from the midend if Mines supersedes its game description,
+ * so we can update the permalinks.
+ */
+static void desc_changed(void *ignored)
+{
+    update_permalinks();
+}
+
 /* ----------------------------------------------------------------------
  * Implementation of the drawing API by calling Javascript canvas
  * drawing functions. (Well, half of it; the other half is on the JS
@@ -762,6 +771,13 @@ int main(int argc, char **argv)
     }
 
     /*
+     * Request notification if a puzzle (hopefully only ever Mines)
+     * supersedes its game description, so that we can proactively
+     * update the permalink.
+     */
+    midend_request_desc_changes(me, desc_changed, NULL);
+
+    /*
      * Draw the puzzle's initial state, and set up the permalinks and
      * undo/redo greying out.
      */