From 19663e157fb51c18ee286b5587b7b4803f279238 Mon Sep 17 00:00:00 2001
From: PatR <rankin@nethack.org>
Date: Mon, 9 Oct 2017 17:34:02 -0700
Subject: [PATCH] hurtling into unseen monsters

Expand "You bump into it." into something more comprehensive when
encountering an unseen monster while hurtling.  Tested with jumping
but other forms of hurtling should behave the same.
---
 src/dothrow.c | 41 +++++++++++++++++++++++++++++++++++------
 1 file changed, 35 insertions(+), 6 deletions(-)

diff --git a/src/dothrow.c b/src/dothrow.c
index 9918e5e77..0b1539454 100644
--- a/src/dothrow.c
+++ b/src/dothrow.c
@@ -625,8 +625,8 @@ int x, y;
         }
         if ((u.ux - x) && (u.uy - y) && bad_rock(youmonst.data, u.ux, y)
             && bad_rock(youmonst.data, x, u.uy)) {
-            boolean too_much =
-                (invent && (inv_weight() + weight_cap() > 600));
+            boolean too_much = (invent && (inv_weight() + weight_cap() > 600));
+
             /* Move at a diagonal. */
             if (bigmonst(youmonst.data) || too_much) {
                 You("%sget forcefully wedged into a crevice.",
@@ -640,14 +640,43 @@ int x, y;
         }
     }
 
-    if ((mon = m_at(x, y)) != 0) {
-        You("bump into %s.", a_monnam(mon));
+    if ((mon = m_at(x, y)) != 0
+#if 0   /* we can't include these two exceptions unless we know we're
+         * going to end up past the current spot rather than on it;
+         * for that, we need to know that the range is not exhausted
+         * and also that the next spot doesn't contain an obstacle */
+        && !(mon->mundetected && hides_under(mon) && (Flying || Levitation))
+        && !(mon->mundetected && mon->data->mlet == S_EEL
+             && (Flying || Levitation || Wwalking))
+#endif
+        ) {
+        const char *mnam, *pronoun;
+        int glyph = glyph_at(x, y);
+
+        mon->mundetected = 0; /* wakeup() will handle mimic */
+        mnam = a_monnam(mon); /* after unhiding */
+        pronoun = mhim(mon);
+        if (!strcmp(mnam, "it")) {
+            /* mhim() uses pronoun_gender() which forces neuter if monster
+               can't be seen; we want him/her for humanoid sensed by touch */
+            if (!strcmp(pronoun, "it") && humanoid(mon->data))
+                pronoun = genders[mon->female].him;
+            mnam = !strcmp(pronoun, "it") ? "something" : "someone";
+        }
+        if (!glyph_is_monster(glyph) && !glyph_is_invisible(glyph))
+            You("find %s by bumping into %s.", mnam, pronoun);
+        else
+            You("bump into %s.", mnam);
         wakeup(mon, FALSE);
+        if (!canspotmon(mon))
+            map_invisible(mon->mx, mon->my);
         setmangry(mon, FALSE);
-        wake_nearto(x,y, 10);
+        wake_nearto(x, y, 10);
         return FALSE;
     }
-    if ((u.ux - x) && (u.uy - y) && bad_rock(youmonst.data, u.ux, y)
+
+    if ((u.ux - x) && (u.uy - y)
+        && bad_rock(youmonst.data, u.ux, y)
         && bad_rock(youmonst.data, x, u.uy)) {
         /* Move at a diagonal. */
         if (Sokoban) {
-- 
2.40.0