From 3d6551a70e3f3ca212d4a6141aa816a193c9c4c7 Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Sat, 10 Oct 2020 11:31:16 +0300
Subject: [PATCH] Lua: Allow matching any wall

A 'w' in a map fragment will match any wall (IS_WALL macro):

   des.replace_terrain({ mapfragment = "w", toterrain = "F" });
---
 src/sp_lev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/sp_lev.c b/src/sp_lev.c
index 446e78258..f11099af2 100755
--- a/src/sp_lev.c
+++ b/src/sp_lev.c
@@ -197,6 +197,9 @@ static struct monst *invent_carrying_monster = (struct monst *) 0;
      * end of no 'g.'
      */
 
+#define TYP_CANNOT_MATCH(typ) \
+    ((typ) == MAX_TYPE || (typ) == INVALID_TYPE)
+
 /* Does typ match with levl[][].typ, considering special types
    MATCH_WALL and MAX_TYPE (aka transparency)? */
 static boolean
@@ -277,7 +280,7 @@ struct mapfragment *mf;
     else if (!mapfrag_canmatch(mf)) {
         mapfrag_free(&mf);
         return "mapfragment needs to have odd height and width";
-    } else if (mapfrag_get(mf, (mf->wid/2), (mf->hei/2)) >= MAX_TYPE) {
+    } else if (TYP_CANNOT_MATCH(mapfrag_get(mf, (mf->wid/2), (mf->hei/2)))) {
         mapfrag_free(&mf);
         return "mapfragment center must be valid terrain";
     }