Allow overriding of monster target selection through Lua.

_find_monster now calls ch_target_monster with coordinates of
a possible target.

Currently ch_target_monster is only passed the relative
coordinates of the possible target. It could easily be
passed flags like need_path. Eventually, it should be able
to check what the targetting is about (which spell, etc.),
but that's not so easy to do currently.

1 files changed, 11 insertions, 0 deletions

diff --git a/crawl-ref/source/directn.cc b/crawl-ref/source/directn.cc
index 405078316b..07736e93ce 100644
--- a/crawl-ref/source/directn.cc
+++ b/crawl-ref/source/directn.cc
@@ -2020,6 +2020,17 @@ static bool _find_mlist(const coord_def& where, int idx, bool need_path,
 static bool _find_monster( const coord_def& where, int mode, bool need_path,
                            int range = -1)
 {
+#ifdef CLUA_BINDINGS
+    {
+        coord_def dp = grid2player(where);
+        // We could pass more info here.
+        maybe_bool x = clua.callmbooleanfn("ch_target_monster", "dd",
+                                           dp.x, dp.y);
+        if (x != B_MAYBE)
+            return (tobool(x));
+    }
+#endif
+
     // Target the player for friendly and general spells.
     if ((mode == TARG_FRIEND || mode == TARG_ANY) && where == you.pos())
         return (true);