Warn the player that invisibility is about to time out

doc/xnh-changelog-9.0.md

@@ -38,6 +38,8 @@ changes:
 - When you #chat and are next to only one observable monster, you will
   automatically attempt to chat to that monster without being prompted for a
   direction to chat in.
+- When you are a few turns from temporary invisibility expiring, you receive a
+  message warning you that you're becoming visible again.
 
 ### Architectural changes
 

src/timeout.c

@@ -9,6 +9,7 @@ static void stoned_dialogue(void);
 static void vomiting_dialogue(void);
 static void choke_dialogue(void);
 static void levitation_dialogue(void);
+static void reappear_dialogue(void);
 static void slime_dialogue(void);
 static void slimed_to_death(struct kinfo *);
 static void sickness_dialogue(void);
@@ -388,6 +389,23 @@ levitation_dialogue(void)
     }
 }
 
+static void
+reappear_dialogue(void)
+{
+    if (EInvis)
+        return;
+
+    if ((HInvis & TIMEOUT) == 5) {
+        if (Hallucination) {
+            You("are starting to get less clarified.");
+        } else if (See_invisible) {
+            You("are beginning to unfade.");
+        } else {
+            Your("outline is starting to become visible.");
+        }
+    }
+}
+
 static NEARDATA const char *const slime_texts[] = {
     "You are turning a little %s.",   /* 5 */
     "Your limbs are getting oozy.",   /* 4 */
@@ -587,6 +605,8 @@ nh_timeout(void)
         else if (u.uluck < baseluck && (nostone || time_luck > 0))
             u.uluck++;
     }
+    if (HInvis & TIMEOUT)
+        reappear_dialogue();
     if (u.uinvulnerable)
         return; /* things past this point could kill you */
     if (Stoned)