Add /spoiler command

As a temporary measure until we have an extensible Markdown parser.

Signed-off-by: Robin Townsend <robin@robin.town>

src/SlashCommands.tsx

@@ -154,6 +154,18 @@ function success(promise?: Promise<any>) {
  */
 
 export const Commands = [
+    new Command({
+        command: 'spoiler',
+        args: '<message>',
+        description: _td('Sends the given message as a spoiler'),
+        runFn: function(roomId, message) {
+            return success(MatrixClientPeg.get().sendHtmlMessage(
+                roomId, message,
+                `<span data-mx-spoiler>${message}</span>`,
+            ));
+        },
+        category: CommandCategories.messages,
+    }),
     new Command({
         command: 'shrug',
         args: '<message>',