Replaced timed markers with Lua markers. Breaks save compatibility.

KFEAT: feature names are now as in the dungeon_feature_type enum.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1930 c06c8d41-db1a-0410-9941-cceddc491573

43 files changed, 1267 insertions, 348 deletions

diff --git a/crawl-ref/docs/level-design.txt b/crawl-ref/docs/level-design.txt
index 2c42429363..33d52687c2 100644
--- a/crawl-ref/docs/level-design.txt
+++ b/crawl-ref/docs/level-design.txt
@@ -517,7 +517,7 @@ NSUBST:  ? = 3:w / *:l
          omit the initial N: or N=, then 1= is assumed, except for the
          last spec where *= is assumed.
 
-KFEAT:   Z = C / needle trap / antique armour shop / altar of Zin
+KFEAT:   Z = C / needle trap / antique armour shop / altar_zin
          The KFEAT: directive allows you to specify a placeholder symbol 
          that is replaced with another symbol, named feature, trap, or 
          shop. For example, the line above will replace occurrences of Z 
@@ -530,11 +530,11 @@ KFEAT:   Z = C / needle trap / antique armour shop / altar of Zin
          You'll notice that 'Z' is the symbol of the Orb of Zot. Kxxx 
          directives allow you to assign arbitrary definitions to any symbol.
 
-         KFEAT features are specified as a unique substring of the in-game
-         description of the feature; simple * and ? wildcards can also be
-         used. For instance, to place a portal to the Abyss, you can use:
+         KFEAT features are specified as a feature name (see section I
+         for a full list of feature names). As another example, you can
+         place a portal to the Abyss as:
 
-         KFEAT: A = gate to the * Abyss
+         KFEAT: A = enter_abyss
 
          If you want no feature as an option in a KFEAT line, use 'floor'.
          If you do not want to specify the type of shop, use 'any shop' or
@@ -611,8 +611,8 @@ MARKER:  A = feat:<feature_name> or timer:
          feature to deep water at the end of it.
 
          Feature names used in markers must be names matching the
-         names in the source code, not the descriptions as used in
-         KFEAT. There's a full list of feature names at the end of this
+         names in the source code. There's a full list of feature
+         names in section I (Feature names) at the end of this
          document.
          
 
diff --git a/crawl-ref/source/clua.cc b/crawl-ref/source/clua.cc
index d16c2bf31d..717707c1cc 100644
--- a/crawl-ref/source/clua.cc
+++ b/crawl-ref/source/clua.cc
@@ -11,6 +11,7 @@
 #include "chardump.h"
 #include "cio.h"
 #include "delay.h"
+#include "dgnevent.h"
 #include "files.h"
 #include "food.h"
 #include "invent.h"
@@ -32,6 +33,7 @@
 #include "spl-util.h"
 #include "stuff.h"
 #include "travel.h"
+#include "view.h"
 
 #include <cstring>
 #include <map>
@@ -215,7 +217,7 @@ int CLua::loadstring(const char *s, const char *context)
     return loadbuffer(s, strlen(s), context);
 }
 
-int CLua::execstring(const char *s, const char *context)
+int CLua::execstring(const char *s, const char *context, int nresults)
 {
     int err = 0;
     if ((err = loadstring(s, context)))
@@ -223,7 +225,7 @@ int CLua::execstring(const char *s, const char *context)
     
     lua_State *ls = state();
     lua_call_throttle strangler(this);
-    err = lua_pcall(ls, 0, 0, 0);
+    err = lua_pcall(ls, 0, nresults, 0);
     set_error(err, ls);
     return err;
 }
@@ -266,6 +268,9 @@ int CLua::execfile(const char *filename, bool trusted, bool die_on_fail)
     if (!err)
         err = lua_pcall(ls, 0, 0, 0);
     set_error(err);
+    if (die_on_fail && !error.empty())
+        end(1, false, "Lua execfile error (%s): %s",
+            filename, dlua.error.c_str());
     return (err);
 }
 
@@ -411,6 +416,9 @@ int CLua::push_args(lua_State *ls, const char *format, va_list args,
         case 'b':
             lua_pushboolean(ls, va_arg(args, int));
             break;
+        case 'D':
+            clua_push_dgn_event(ls, va_arg(args, const dgn_event *));
+            break;
         case 'm':
             clua_push_map(ls, va_arg(args, map_def *));
             break;
@@ -579,6 +587,8 @@ void CLua::init_lua()
     if (!_state)
         return;
 
+    lua_stack_cleaner clean(_state);
+
     lua_atpanic(_state, clua_panic);
 
     luaopen_base(_state);
@@ -601,16 +611,25 @@ void CLua::init_lua()
     load_cmacro();
     load_chooks();
 
+    lua_register(_state, "loadfile", clua_loadfile);
+    lua_register(_state, "dofile", clua_dofile);
+
     if (managed_vm)
     {
         lua_register(_state, "pcall", clua_guarded_pcall);
-        lua_register(_state, "loadfile", clua_loadfile);
-        lua_register(_state, "dofile", clua_dofile);
-
         execfile("clua/userbase.lua", true, true);
-    }
+    }        
 
-    lua_settop(_state, 1);
+    lua_pushboolean(_state, managed_vm);
+    setregistry("lua_vm_is_managed");
+}
+
+bool CLua::is_managed_vm(lua_State *ls)
+{
+    lua_stack_cleaner clean(ls);
+    lua_pushstring(ls, "lua_vm_is_managed");
+    lua_gettable(ls, LUA_REGISTRYINDEX);
+    return (lua_toboolean(ls, -1));
 }
 
 void CLua::load_chooks()
@@ -652,15 +671,6 @@ static void clua_register_metatable(lua_State *ls, const char *tn,
     lua_settop(ls, top);
 }
 
-template <class T> T *clua_new_userdata(
-        lua_State *ls, const char *mt)
-{
-    void *udata = lua_newuserdata( ls, sizeof(T) );
-    luaL_getmetatable(ls, mt);
-    lua_setmetatable(ls, -2);
-    return static_cast<T*>( udata );
-}
-
 /////////////////////////////////////////////////////////////////////
 // Bindings to get information on the player
 //
@@ -724,6 +734,9 @@ LUARET1(you_branch, string, level_id::current().describe(false, false).c_str())
 LUARET1(you_subdepth, number, level_id::current().depth)
 LUARET1(you_absdepth, number, you.your_level + 1)
 LUAWRAP(you_stop_activity, interrupt_activity(AI_FORCE_INTERRUPT))
+LUARET1(you_turns, number, you.num_turns)
+LUARET1(you_see_grid, boolean,
+        see_grid(luaL_checkint(ls, 1), luaL_checkint(ls, 2)))
 
 void lua_push_floor_items(lua_State *ls);
 static int you_floor_items(lua_State *ls)
@@ -764,6 +777,7 @@ static int l_you_abils(lua_State *ls)
 static const struct luaL_reg you_lib[] =
 {
     { "turn_is_over", you_turn_is_over },
+    { "turns"       , you_turns },
     { "spells"      , l_you_spells },
     { "abilities"   , l_you_abils },
     { "name"        , you_name },
@@ -800,6 +814,9 @@ static const struct luaL_reg you_lib[] =
     { "branch",       you_branch },
     { "subdepth",     you_subdepth },
     { "absdepth",     you_absdepth },
+
+    { "see_grid",     you_see_grid },
+    
     { NULL, NULL },
 };
 
@@ -1268,33 +1285,6 @@ static int l_item_worn(lua_State *ls)
     return (2);
 }
 
-static description_level_type desc_code(const char *desc)
-{
-    if (!desc)
-        return DESC_PLAIN;
-    
-    if (!strcmp("The", desc))
-        return DESC_CAP_THE;
-    else if (!strcmp("the", desc))
-        return DESC_NOCAP_THE;
-    else if (!strcmp("A", desc))
-        return DESC_CAP_A;
-    else if (!strcmp("a", desc))
-        return DESC_NOCAP_A;
-    else if (!strcmp("Your", desc))
-        return DESC_CAP_YOUR;
-    else if (!strcmp("your", desc))
-        return DESC_NOCAP_YOUR;
-    else if (!strcmp("its", desc))
-        return DESC_NOCAP_ITS;
-    else if (!strcmp("worn", desc))
-        return DESC_INVENTORY_EQUIP;
-    else if (!strcmp("inv", desc))
-        return DESC_INVENTORY;
-
-    return DESC_PLAIN;
-}
-
 static int l_item_name(lua_State *ls)
 {
     LUA_ITEM(item, 1);
@@ -1302,7 +1292,9 @@ static int l_item_name(lua_State *ls)
     {
         description_level_type ndesc = DESC_PLAIN;
         if (lua_isstring(ls, 2))
-            ndesc = desc_code(lua_tostring(ls, 2));
+            ndesc = description_type_by_name(lua_tostring(ls, 2));
+        else if (lua_isnumber(ls, 2))
+            ndesc = static_cast<description_level_type>(luaL_checkint(ls, 2));
         bool terse = lua_toboolean(ls, 3);
         lua_pushstring(ls, item->name(ndesc, terse).c_str());
     }
@@ -1916,6 +1908,9 @@ LUARET1(crawl_random2, number, random2( luaL_checkint(ls, 1) ))
 LUARET1(crawl_one_chance_in, boolean, one_chance_in( luaL_checkint(ls, 1) ))
 LUARET1(crawl_random2avg, number,
         random2avg( luaL_checkint(ls, 1), luaL_checkint(ls, 2) ))
+LUARET1(crawl_random_range, number,
+        random_range( luaL_checkint(ls, 1), luaL_checkint(ls, 2),
+                      lua_isnumber(ls, 3)? luaL_checkint(ls, 3) : 1 ))
 LUARET1(crawl_coinflip, boolean, coinflip())
 
 static int crawl_err_trace(lua_State *ls)
@@ -1959,6 +1954,7 @@ static const struct luaL_reg crawl_lib[] =
     { "one_chance_in",  crawl_one_chance_in },
     { "random2avg"   ,  crawl_random2avg },
     { "coinflip",       crawl_coinflip },
+    { "random_range",   crawl_random_range },
     { "redraw_screen",  crawl_redraw_screen },
     { "input_line",     crawl_input_line },
     { "c_input_line",   crawl_c_input_line},
@@ -1996,7 +1992,6 @@ void luaopen_crawl(lua_State *ls)
 ///////////////////////////////////////////////////////////
 // File operations
 
-
 static const struct luaL_reg file_lib[] =
 {
     { "write", CLua::file_write },
@@ -2262,6 +2257,13 @@ void clua_push_map(lua_State *ls, map_def *map)
     *mapref = map;
 }
 
+void clua_push_dgn_event(lua_State *ls, const dgn_event *devent)
+{
+    const dgn_event **de =
+        clua_new_userdata<const dgn_event *>(ls, DEVENT_METATABLE);
+    *de = devent;
+}
+
 void luaopen_monsters(lua_State *ls)
 {
     luaL_newmetatable(ls, MONS_METATABLE);
@@ -2626,7 +2628,7 @@ static int clua_loadfile(lua_State *ls)
     if (!file)
         return (0);
 
-    const int err = CLua::loadfile(ls, file);
+    const int err = CLua::loadfile(ls, file, !CLua::is_managed_vm(ls));
     if (err)
     {
         const int place = lua_gettop(ls);
@@ -2643,7 +2645,7 @@ static int clua_dofile(lua_State *ls)
     if (!file)
         return (0);
 
-    const int err = CLua::loadfile(ls, file);
+    const int err = CLua::loadfile(ls, file, !CLua::is_managed_vm(ls));
     if (err)
         return (lua_error(ls));
 
diff --git a/crawl-ref/source/clua.h b/crawl-ref/source/clua.h
index 44da65b057..99a4e24bc3 100644
--- a/crawl-ref/source/clua.h
+++ b/crawl-ref/source/clua.h
@@ -23,6 +23,17 @@ extern "C" {
 #endif
 
 class CLua;
+
+class lua_stack_cleaner
+{
+public:
+    lua_stack_cleaner(lua_State *_ls) : ls(_ls), top(lua_gettop(_ls)) { }
+    ~lua_stack_cleaner() { lua_settop(ls, top); }
+private:
+    lua_State *ls;
+    int top;
+};
+
 class lua_call_throttle
 {
 public:
@@ -55,7 +66,7 @@ public:
 
     void setglobal(const char *name);
     void getglobal(const char *name);
-    
+
     // Assigns the value on top of the stack to a unique name in the registry
     // and returns the name.
     std::string setuniqregistry();
@@ -65,7 +76,8 @@ public:
 
     int loadbuffer(const char *buf, size_t size, const char *context);
     int loadstring(const char *str, const char *context);
-    int execstring(const char *str, const char *context = "init.txt");
+    int execstring(const char *str, const char *context = "init.txt",
+                   int nresults = 0);
     int execfile(const char *filename, bool trusted = false,
                  bool die_on_fail = false);
 
@@ -80,6 +92,8 @@ public:
                         bool trusted = false, bool die_on_fail = false);
     static bool is_path_safe(std::string file, bool trusted = false);
 
+    static bool is_managed_vm(lua_State *ls);
+
 public:
     std::string error;
 
@@ -208,8 +222,21 @@ inline static T *clua_get_userdata(lua_State *ls, const char *mt)
 std::string quote_lua_string(const std::string &s);
 
 class map_def;
+class dgn_event;
 void clua_push_map(lua_State *ls, map_def *map);
+void clua_push_dgn_event(lua_State *ls, const dgn_event *devent);
+
+template <class T> T *clua_new_userdata(
+        lua_State *ls, const char *mt)
+{
+    void *udata = lua_newuserdata( ls, sizeof(T) );
+    luaL_getmetatable(ls, mt);
+    lua_setmetatable(ls, -2);
+    return static_cast<T*>( udata );
+}
 
 #define MAP_METATABLE "dgn.mtmap"
+#define DEVENT_METATABLE "dgn.devent"
+#define MAPMARK_METATABLE "dgn.mapmark"
 
 #endif
diff --git a/crawl-ref/source/dat/bazaar.des b/crawl-ref/source/dat/bazaar.des
index 618509f125..cc1cb17d0b 100644
--- a/crawl-ref/source/dat/bazaar.des
+++ b/crawl-ref/source/dat/bazaar.des
@@ -9,8 +9,14 @@
 
 lua {{
     function check_expire_marker(e)
+        e.messager = 
+            bell_clock_msg { initmsg="You hear coins being counted." }
         if not crawl.one_chance_in(3) then
-            e.marker("O = timer: 1000-1500")
+            e.marker( [[ O = lua: timed_marker {
+                            low=1000, high=1500, msg=messager }
+                      ]] )
+        else
+            e.marker("O = lua: one_way_stair()")
         end
     end
 }}
diff --git a/crawl-ref/source/dat/clua/lm_1way.lua b/crawl-ref/source/dat/clua/lm_1way.lua
new file mode 100644
index 0000000000..6ce1e6d722
--- /dev/null
+++ b/crawl-ref/source/dat/clua/lm_1way.lua
@@ -0,0 +1,35 @@
+------------------------------------------------------------------------------
+-- lm_1way.lua:
+-- One-way stair marker.
+------------------------------------------------------------------------------
+
+OneWayStair = { }
+OneWayStair.__index = OneWayStair
+
+function OneWayStair.new()
+  local ows = { }
+  setmetatable(ows, OneWayStair)
+  return ows
+end
+
+function OneWayStair:activate(marker)
+  local ev = dgn.dgn_event_type('player_climb')
+  dgn.register_listener(ev, marker, marker:pos())
+end
+
+function OneWayStair:event(marker, ev)
+  if ev:type() == dgn.dgn_event_type('player_climb') then
+    local x, y = ev:pos()
+    dgn.terrain_changed(x, y, 'floor', false)
+    dgn.remove_listener(marker, ev:pos())
+    dgn.remove_marker(marker)
+  end
+end
+
+function OneWayStair.read(marker, th)
+  return OneWayStair.new()
+end
+
+function one_way_stair()
+  return OneWayStair.new()
+end
diff --git a/crawl-ref/source/dat/clua/lm_timed.lua b/crawl-ref/source/dat/clua/lm_timed.lua
new file mode 100644
index 0000000000..8b9f1aaf26
--- /dev/null
+++ b/crawl-ref/source/dat/clua/lm_timed.lua
@@ -0,0 +1,105 @@
+------------------------------------------------------------------------------
+-- lm_timed.lua:
+-- Lua timed map feature markers.
+------------------------------------------------------------------------------
+
+dofile('clua/lm_tmsg.lua')
+
+TimedMarker = { }
+TimedMarker.__index = TimedMarker
+
+function TimedMarker._new()
+  local marker = { }
+  setmetatable(marker, TimedMarker)
+  return marker
+end
+
+function TimedMarker.new(pars)
+  pars = pars or { }
+  if not pars.msg then
+    error("No messaging object provided (msg = nil)")
+  end
+  pars.high = pars.high or pars.low or pars.turns or 1
+  pars.low  = pars.low or pars.high or pars.turns or 1
+  local dur = crawl.random_range(pars.low, pars.high, pars.navg or 1)
+  local feat = pars.feat or 'floor'
+  local fnum = dgn.feature_number(feat)
+  if fnum == dgn.feature_number('unseen') then
+    error("Bad feature name: " .. feat)
+  end
+
+  local tmarker = TimedMarker._new()
+  tmarker.dur   = dur * 10
+  tmarker.fnum  = fnum
+  tmarker.feat  = feat
+  tmarker.msg   = pars.msg
+  return tmarker
+end
+
+function TimedMarker:activate(marker)
+  self.msg:init(self, marker)
+
+  dgn.register_listener(dgn.dgn_event_type('turn'), marker)
+  dgn.register_listener(dgn.dgn_event_type('player_climb'), 
+                        marker, marker:pos())
+end
+
+function TimedMarker:timeout(marker, verbose, affect_player)
+  local x, y = marker:pos()
+  if verbose then
+    if you.see_grid(marker:pos()) then
+      crawl.mpr(dgn.feature_desc(dgn.grid(x, y), "The") .. 
+                " disappears!")
+    else
+      crawl.mpr("The walls and floor vibrate strangely for a moment.")
+    end
+  end
+  dgn.terrain_changed(x, y, self.fnum, affect_player)
+  dgn.remove_listener(marker)
+  dgn.remove_listener(marker, marker:pos())
+  dgn.remove_marker(marker)
+end
+
+function TimedMarker:event(marker, ev)
+  self.ticktype = self.ticktype or dgn.dgn_event_type('turn')
+  self.stairtype = self.stairtype or dgn.dgn_event_type('player_climb')
+
+  if ev:type() == self.stairtype then
+    local mx, my = marker:pos()
+    local ex, ey = ev:pos()
+    if mx == ex and my == ey then
+      self:timeout(marker, false, false)
+    end
+    return
+  end
+
+  if ev:type() ~= self.ticktype then
+    return
+  end
+  self.dur = self.dur - ev:ticks()
+  self.msg:event(self, marker, ev)
+  if self.dur <= 0 then
+    self:timeout(marker, true, true)
+  end
+end
+
+function TimedMarker:describe(marker)
+  return self.feat .. "/" .. tostring(self.dur)
+end
+
+function TimedMarker.read(marker, th)
+  local marker = TimedMarker._new()
+  marker.dur = file.unmarshall_number(th)
+  marker.fnum = file.unmarshall_number(th)
+  marker.feat = file.unmarshall_string(th)
+  marker.msg  = file.unmarshall_fn(th)(th)
+  return marker
+end
+
+function TimedMarker:write(marker, th)
+  file.marshall(th, self.dur)
+  file.marshall(th, self.fnum)
+  file.marshall(th, self.feat)
+  file.marshall(th, self.msg.read)
+  self.msg:write(th)
+end
diff --git a/crawl-ref/source/dat/clua/lm_tmsg.lua b/crawl-ref/source/dat/clua/lm_tmsg.lua
new file mode 100644
index 0000000000..1448e7ade0
--- /dev/null
+++ b/crawl-ref/source/dat/clua/lm_tmsg.lua
@@ -0,0 +1,106 @@
+------------------------------------------------------------------------------
+-- lm_tmsg.lua:
+-- Messaging for timed Lua markers.
+------------------------------------------------------------------------------
+
+TimedMessaging = { }
+TimedMessaging.__index = TimedMessaging
+
+function TimedMessaging._new()
+  local m = { }
+  setmetatable(m, TimedMessaging)
+  return m
+end
+
+function TimedMessaging.new(pars)
+  pars = pars or { }
+  local m = TimedMessaging._new()
+  m.noisemaker = pars.noisemaker
+  m.verb       = pars.verb
+  m.finalmsg   = pars.finalmsg
+  m.ranges     = pars.ranges
+  m.initmsg    = pars.initmsg or ''
+  return m
+end
+
+function TimedMessaging:init(tmarker, cm)
+  local lab = dgn.grid(cm:pos()) == dgn.feature_number('enter_labyrinth')
+  if not self.noisemaker then
+    self.noisemaker = lab and "an ancient clock" or "a massive bell"
+  end
+
+  self.verb = self.verb or (lab and 'ticking' or 'tolling')
+
+  if not self.finalmsg then
+    self.finalmsg = lab and "last, dying ticks of the clock"
+                        or  "last, dying notes of the bell"
+  end
+
+  if not self.ranges then
+    self.ranges = { { 5000, 'stately ' }, { 4000, '' },
+                    { 2500, 'brisk ' },   { 1500, 'urgent ' },
+                    { 0, 'frantic ' } }
+  end
+
+  self.check = self.check or tmarker.dur - 500
+  if self.check < 50 then
+    self.check = 50
+  end
+
+  if #self.initmsg > 0 and you.hear_pos(cm:pos()) then
+    crawl.mpr(self.initmsg, "sound")
+  end
+end
+
+function TimedMessaging:say_message(dur)
+  self.sound_channel = self.sound_channel or crawl.msgch_num('sound')
+  if dur <= 0 then
+    crawl.mpr("You hear the " .. self.finalmsg .. ".", self.sound_channel)
+    return
+  end
+  for _, chk in ipairs(self.ranges) do
+    if dur > chk[1] then
+      crawl.mpr("You hear the " .. chk[2] .. self.verb 
+                .. " of " .. self.noisemaker .. ".",
+                self.sound_channel)
+      break
+    end
+  end
+end
+
+function TimedMessaging:event(luamark, cmarker, event)
+  if luamark.dur < self.check or luamark.dur <= 0 then
+    self.check = luamark.dur - 250
+    if luamark.dur > 900 then
+      self.check = self.check - 250
+    end
+
+    if you.hear_pos(cmarker:pos()) then
+      self:say_message(luamark.dur)
+    end
+  end
+end
+
+function TimedMessaging:write(th)
+  file.marshall(th, self.check)
+  file.marshall(th, self.noisemaker)
+  file.marshall(th, self.verb)
+  file.marshall(th, self.initmsg)
+  file.marshall(th, self.finalmsg)
+  lmark.marshall_table(th, self.ranges)
+end
+
+function TimedMessaging.read(th)
+  local tm = TimedMessaging._new()
+  tm.check = file.unmarshall_number(th)
+  tm.noisemaker = file.unmarshall_string(th)
+  tm.verb = file.unmarshall_string(th)
+  tm.initmsg = file.unmarshall_string(th)
+  tm.finalmsg = file.unmarshall_string(th)
+  tm.ranges = lmark.unmarshall_table(th)
+  return tm
+end
+
+function bell_clock_msg(pars)
+  return TimedMessaging.new(pars)
+end
diff --git a/crawl-ref/source/dat/clua/luamark.lua b/crawl-ref/source/dat/clua/luamark.lua
new file mode 100644
index 0000000000..d2d12ce34e
--- /dev/null
+++ b/crawl-ref/source/dat/clua/luamark.lua
@@ -0,0 +1,88 @@
+------------------------------------------------------------------------------
+-- luamark.lua:
+-- Lua map marker handling.
+------------------------------------------------------------------------------
+
+dofile('clua/lm_timed.lua')
+dofile('clua/lm_1way.lua')
+
+function dlua_marker_function(table, name)
+  return table[name]
+end
+
+function dlua_marker_method(table, name, marker, ...)
+  if table[name] then
+    return table[name](table, marker, ...)
+  end
+end
+
+function dlua_marker_read(fn, marker, th)
+  return fn(marker, th)
+end
+
+function timed_marker(pars)
+  return TimedMarker.new(pars)
+end
+
+lmark = { }
+
+-- Marshalls a table comprising of keys that are strings or numbers only,
+-- and values that are strings, numbers, functions, or tables only. The table
+-- cannot have cycles, and the table's metatable is not preserved.
+function lmark.marshall_table(th, table)
+  if not table then
+    file.marshall(th, -1)
+    return
+  end
+
+  -- Count the number of elements first (ugh)
+  local nsize = 0
+  local tsize = 0
+  for _, v in pairs(table) do
+    if type(v) == 'table' then
+      tsize = tsize + 1
+    else
+      nsize = nsize + 1
+    end
+  end
+
+  file.marshall(th, nsize)
+  for key, value in pairs(table) do
+    if type(value) ~= 'table' then
+      file.marshall_meta(th, key)
+      file.marshall_meta(th, value)
+    end
+  end
+
+  file.marshall(th, tsize)
+  for key, value in pairs(table) do
+    if type(value) == 'table' then
+      file.marshall_meta(th, key)
+      lmark.marshall_table(th, value)
+    end
+  end
+end
+
+-- Unmarshals a table marshaled by marshall_table.
+function lmark.unmarshall_table(th)
+  local nsize = file.unmarshall_number(th)
+
+  if nsize == -1 then
+    return nil
+  end
+
+  local ret = { }
+  for i = 1, nsize do
+    local key = file.unmarshall_meta(th)
+    local val = file.unmarshall_meta(th)
+    ret[key] = val
+  end
+
+  local tsize = file.unmarshall_number(th)
+  for i = 1, tsize do
+    local key = file.unmarshall_meta(th)
+    local val = lmark.unmarshall_table(th)
+    ret[key] = val
+  end
+  return ret
+end
diff --git a/crawl-ref/source/dat/float.des b/crawl-ref/source/dat/float.des
index 4922553783..175ef6ee52 100644
--- a/crawl-ref/source/dat/float.des
+++ b/crawl-ref/source/dat/float.des
@@ -283,7 +283,7 @@ MONS:    rat/grey rat/w:6 green rat/w:3 orange rat/w:20 giant bat
 MONS:    flying skull, human zombie
 MONS:    vampire, vampire mage, vampire knight
 KITEM:   > = any good_item
-KFEAT:   ; = altar of Yredelemnul/altar of Kikubaaqudgha
+KFEAT:   ; = altar_yredelemnul/altar_kikubaaqudgha
 SHUFFLE: defg
 SHUFFLE: *s/!?
 SUBST:   d = =, e = x, f = x, g = x
diff --git a/crawl-ref/source/dat/hells.des b/crawl-ref/source/dat/hells.des
index 05e7d75db8..a98f785006 100644
--- a/crawl-ref/source/dat/hells.des
+++ b/crawl-ref/source/dat/hells.des
@@ -111,7 +111,9 @@ ENDMAP
 NAME: vestibule_of_hell
 PLACE: Hell
 ORIENT: encompass
-MARKER: D=feat:enter_dis, G=feat:enter_gehenna, C=feat:enter_cocytus
+MARKER: D=feat:enter_dis
+MARKER: G=feat:enter_gehenna
+MARKER: C=feat:enter_cocytus
 MARKER: T=feat:enter_tartarus
 SUBST: D=A, G=A, C=A, T=A
 
diff --git a/crawl-ref/source/dat/lab.des b/crawl-ref/source/dat/lab.des
index a5a4e68cec..72056aa1d4 100644
--- a/crawl-ref/source/dat/lab.des
+++ b/crawl-ref/source/dat/lab.des
@@ -12,7 +12,10 @@ NAME:   lab_entry_generic
 TAGS:   lab_entry transparent
 DEPTH:  12-26
 ORIENT: float
-MARKER: O = timer:400-600
+: messager = bell_clock_msg { initmsg="You hear a distant snort." }
+MARKER: O = lua: timed_marker {  \
+                 low=400, high=600, msg=messager \
+            }
 MAP
 O
 ENDMAP
@@ -344,7 +347,7 @@ ENDMAP
 # Teaser: fake exit
 NAME: labyrinth_fake_exit
 TAGS: lab
-KFEAT: X = gate * Abyss
+KFEAT: X = enter_abyss
 MAP
 ........
 .vvvvvv.
diff --git a/crawl-ref/source/dat/large.des b/crawl-ref/source/dat/large.des
index 3261f5b342..e34102e181 100644
--- a/crawl-ref/source/dat/large.des
+++ b/crawl-ref/source/dat/large.des
@@ -781,7 +781,7 @@ FLAGS:  no_rotate
 DEPTH:  D:14-26, Orc
 MONS:   orc warlord, orc priest, orc high priest, orc warrior, orc wizard
 MONS:   orc knight, orc sorcerer
-KFEAT:  C = altar of Beogh
+KFEAT:  C = altar_beogh
 MAP
 xxxxxxxxxxxxxxxxxxxxxxx@xxxxxxxxxxxxxxxx
 xxxxxxxxxxxxxxxxxxxxxxx.xxxxxxxxxxxxxxxx
diff --git a/crawl-ref/source/dat/mini.des b/crawl-ref/source/dat/mini.des
index bb0b679b8d..97472702c6 100644
--- a/crawl-ref/source/dat/mini.des
+++ b/crawl-ref/source/dat/mini.des
@@ -398,7 +398,7 @@ NAME:    david_defended_altar
 DEPTH:   7-20, !Lair, !Swamp, !Shoal
 SHUFFLE: 1ID/2TC
 MONS:    orc priest, deep elf priest / w:30 nothing
-KFEAT:   D = altar of Beogh / w:2 altar of Okawaru / w:2 altar of Makhleb
+KFEAT:   D = altar_beogh / w:2 altar_okawaru / w:2 altar_makhleb
 MAP
 ccccc...
 c1..c...
@@ -1106,11 +1106,11 @@ SHUFFLE: !;
 SUBST:   " = .:80 W:30
 SUBST:   ; = .:80 W:30
 SUBST:   ! = w:20 W ? c
-KFEAT:   3 = deep water
-KFEAT:   2 = shallow water / .
-KFEAT:   1 = shallow water / . w:30
-KFEAT:   d = shallow water / .
-KFEAT:   e = shallow water / .
+KFEAT:   3 = w
+KFEAT:   2 = W / .
+KFEAT:   1 = W / . w:30
+KFEAT:   d = W / .
+KFEAT:   e = W / .
 KFEAT:   ? = spear trap / blade trap
 MAP
 .........
@@ -1135,11 +1135,11 @@ MONS:    yaktaur captain, grey snake, storm dragon
 ITEM:    potion of cure mutation/potion of gain dexterity/potion of gain strength
 ITEM:    potion of gain intelligence/potion of experience/w:40 potion of heal wound
 SHUFFLE: de, !;
-KFEAT:   3 = deep water / .
-KFEAT:   | = shallow water / .
-KFEAT:   d = shallow water / .
-KFEAT:   e = shallow water / .
-KFEAT:   2 = shallow water 
+KFEAT:   3 = w / .
+KFEAT:   | = W / .
+KFEAT:   d = W / .
+KFEAT:   e = W / .
+KFEAT:   2 = W 
 SUBST:   ; = .:80 W:30
 SUBST:   " = .:80 W:30
 SUBST:   ! = w:20 W ? c
diff --git a/crawl-ref/source/dat/orc.des b/crawl-ref/source/dat/orc.des
index b541934960..f170b12959 100644
--- a/crawl-ref/source/dat/orc.des
+++ b/crawl-ref/source/dat/orc.des
@@ -148,7 +148,7 @@ ENDMAP
 NAME:    david_orc_5
 TAGS:    orc_entry
 ORIENT:  float
-KFEAT:   C = altar of Beogh w:70 / altar of Yredelemnul / altar of Makhleb / altar of Trog
+KFEAT:   C = altar_beogh w:70 / altar_yredelemnul / altar_makhleb / altar_trog
 SHUFFLE: EFGH
 SUBST:   E=3
 SUBST:   F=1, G=1, H=1
@@ -478,7 +478,7 @@ ENDMAP
 ###################################
 # Beogh 1
 NAME: mines1_david
-KFEAT: C = altar of Beogh
+KFEAT: C = altar_beogh
 MAP
 ...........
 .xxxx.xxxx.
@@ -496,7 +496,7 @@ ENDMAP
 ###################################
 # Beogh 2
 NAME: mines2_david
-KFEAT: C = altar of Beogh
+KFEAT: C = altar_beogh
 MONS: orc / orc warrior w:1
 SUBST: . = . 1:2
 MAP
diff --git a/crawl-ref/source/dat/temple.des b/crawl-ref/source/dat/temple.des
index e958377c35..a64b684bde 100644
--- a/crawl-ref/source/dat/temple.des
+++ b/crawl-ref/source/dat/temple.des
@@ -458,18 +458,18 @@ ORIENT:  encompass
 SHUFFLE: ABC/DEF/GHI/JKL/MNO
 SHUFFLE: ABC, DEF, GHI, JKL, MNO
 SUBST:   A=[, B=(, C={
-KFEAT:   D = altar of Trog
-KFEAT:   E = altar of Makhleb
-KFEAT:   F = altar of Okawaru
-KFEAT:   G = altar of The Shining One
-KFEAT:   H = altar of Zin
-KFEAT:   I = altar of Elyvilon
-KFEAT:   J = altar of Sif Muna
-KFEAT:   K = altar of Vehumet
-KFEAT:   L = altar of Kikubaaqudgha
-KFEAT:   M = altar of Yredelemnul
-KFEAT:   N = altar of Xom
-KFEAT:   O = altar of Nemelex Xobeh
+KFEAT:   D = altar_trog
+KFEAT:   E = altar_makhleb
+KFEAT:   F = altar_okawaru
+KFEAT:   G = altar_shining_one
+KFEAT:   H = altar_zin
+KFEAT:   I = altar_elyvilon
+KFEAT:   J = altar_sif_muna
+KFEAT:   K = altar_vehumet
+KFEAT:   L = altar_kikubaaqudgha
+KFEAT:   M = altar_yredelemnul
+KFEAT:   N = altar_xom
+KFEAT:   O = altar_nemelex_xobeh
 SUBST:   X : GUT
 MAP
 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
diff --git a/crawl-ref/source/dgnevent.h b/crawl-ref/source/dgnevent.h
index 9b22d8c477..efc5cdd59a 100644
--- a/crawl-ref/source/dgnevent.h
+++ b/crawl-ref/source/dgnevent.h
@@ -12,6 +12,7 @@
 #include "externs.h"
 #include <list>
 
+// Keep event names in luadgn.cc in sync.
 enum dgn_event_type
 {
     DET_NONE           = 0x0000,
@@ -20,7 +21,9 @@ enum dgn_event_type
     DET_MONSTER_MOVED  = 0x0002,
     DET_PLAYER_MOVED   = 0x0004,
     DET_LEAVING_LEVEL  = 0x0008,
-    DET_ENTERING_LEVEL = 0x0010
+    DET_ENTERING_LEVEL = 0x0010,
+    DET_PLAYER_IN_LOS  = 0x0020,   // Player just entered LOS.
+    DET_PLAYER_CLIMBS  = 0x0040    // Player climbing stairs.
 };
 
 class dgn_event
diff --git a/crawl-ref/source/direct.cc b/crawl-ref/source/direct.cc
index 21ffebe163..675e214549 100644
--- a/crawl-ref/source/direct.cc
+++ b/crawl-ref/source/direct.cc
@@ -1211,7 +1211,20 @@ std::string feature_description(dungeon_feature_type grid,
     if (add_stop)
         desc += ".";
     if (dtype == DESC_PLAIN || (!grid_is_trap(grid) && isupper(desc[0])))
+    {
+        if (isupper(desc[0]))
+        {
+            switch (dtype)
+            {
+            case DESC_PLAIN: case DESC_NOCAP_THE: case DESC_NOCAP_A:
+                desc[0] = tolower(desc[0]);
+                break;
+            default:
+                break;
+            }
+        }
         return (desc);
+    }
 
     switch (dtype)
     {
@@ -1465,10 +1478,7 @@ std::string feature_description(int mx, int my, description_level_type dtype,
     case DNGN_ENTER_SHOP:
         return (shop_name(mx, my, add_stop));
     default:
-        return (feature_description(
-                    grid, NUM_TRAPS,
-                    env_find_marker(coord_def(mx, my), MAT_TIMED_FEATURE),
-                    dtype, add_stop));
+        return (feature_description(grid, NUM_TRAPS, false, dtype, add_stop));
     }
 }
 
@@ -1703,7 +1713,12 @@ static void describe_cell(int mx, int my)
 #ifdef DEBUG_DIAGNOSTICS
     std::string marker;
     if (map_marker *mark = env_find_marker(coord_def(mx, my), MAT_ANY))
-        marker = " (" + mark->describe() + ")";
+    {
+        std::string desc = mark->describe();
+        if (desc.empty())
+            desc = "?";
+        marker = " (" + desc + ")";
+    }
     const std::string traveldest =
         stair_destination_description(coord_def(mx, my));
     mprf("(%d,%d): %s - %s%s%s", mx, my,
diff --git a/crawl-ref/source/dungeon.cc b/crawl-ref/source/dungeon.cc
index 7919634957..5a0f9e20b4 100644
--- a/crawl-ref/source/dungeon.cc
+++ b/crawl-ref/source/dungeon.cc
@@ -4433,6 +4433,7 @@ static void place_shops(int level_number, int nshops)
         {
             place_specific_stair(DNGN_ENTER_BAZAAR, "bzr_entry",
                                  level_number, true);
+            allow_bazaars = false;
         }
         else
         {
diff --git a/crawl-ref/source/externs.h b/crawl-ref/source/externs.h
index ceb0f5c0bc..ade4bf5014 100644
--- a/crawl-ref/source/externs.h
+++ b/crawl-ref/source/externs.h
@@ -1027,6 +1027,7 @@ public:
 public:
     bool has_action_energy() const;
     void check_redraw(const coord_def &oldpos) const;
+    void apply_location_effects();
     
     kill_category kill_alignment() const;
 
diff --git a/crawl-ref/source/files.cc b/crawl-ref/source/files.cc
index 2b64064856..e7e6762ec2 100644
--- a/crawl-ref/source/files.cc
+++ b/crawl-ref/source/files.cc
@@ -931,6 +931,7 @@ bool load( dungeon_feature_type stair_taken, load_mode_type load_mode,
 
     sanity_test_monster_inventory();
 
+    dungeon_events.fire_event(DET_ENTERING_LEVEL);
     // Things to update for player entering level
     if (load_mode == LOAD_ENTER_LEVEL)
     {
diff --git a/crawl-ref/source/libutil.cc b/crawl-ref/source/libutil.cc
index e1cca6a43e..845f96b380 100644
--- a/crawl-ref/source/libutil.cc
+++ b/crawl-ref/source/libutil.cc
@@ -46,6 +46,33 @@
     #include <regex.h>
 #endif
 
+description_level_type description_type_by_name(const char *desc)
+{
+    if (!desc)
+        return DESC_PLAIN;
+    
+    if (!strcmp("The", desc))
+        return DESC_CAP_THE;
+    else if (!strcmp("the", desc))
+        return DESC_NOCAP_THE;
+    else if (!strcmp("A", desc))
+        return DESC_CAP_A;
+    else if (!strcmp("a", desc))
+        return DESC_NOCAP_A;
+    else if (!strcmp("Your", desc))
+        return DESC_CAP_YOUR;
+    else if (!strcmp("your", desc))
+        return DESC_NOCAP_YOUR;
+    else if (!strcmp("its", desc))
+        return DESC_NOCAP_ITS;
+    else if (!strcmp("worn", desc))
+        return DESC_INVENTORY_EQUIP;
+    else if (!strcmp("inv", desc))
+        return DESC_INVENTORY;
+
+    return DESC_PLAIN;
+}
+
 // Should return true if the filename contains nothing that
 // the shell can do damage with.
 bool shell_safe(const char *file)
diff --git a/crawl-ref/source/libutil.h b/crawl-ref/source/libutil.h
index 9af70c60ad..183f6fac2f 100644
--- a/crawl-ref/source/libutil.h
+++ b/crawl-ref/source/libutil.h
@@ -15,12 +15,15 @@
 
 #include "AppHdr.h"
 #include "defines.h"
+#include "enum.h"
 #include <cctype>
 #include <string>
 #include <vector>
 
 extern const char *standard_plural_qualifiers[];
 
+description_level_type description_type_by_name(const char *desc);
+
 std::string lowercase_string(std::string s);
 std::string &lowercase(std::string &s);
 std::string &uppercase(std::string &s);
diff --git a/crawl-ref/source/luadgn.cc b/crawl-ref/source/luadgn.cc
index 2cb194a44e..041b0460ad 100644
--- a/crawl-ref/source/luadgn.cc
+++ b/crawl-ref/source/luadgn.cc
@@ -7,12 +7,14 @@
 
 #include "AppHdr.h"
 #include "clua.h"
+#include "direct.h"
 #include "files.h"
 #include "luadgn.h"
 #include "mapdef.h"
 #include "mapmark.h"
 #include "maps.h"
 #include "stuff.h"
+#include "tags.h"
 #include "dungeon.h"
 #include <sstream>
 
@@ -41,6 +43,14 @@ int dlua_stringtable(lua_State *ls, const std::vector<std::string> &s)
     return dlua_gentable(ls, s, dlua_pushcxxstring);
 }
 
+static int dlua_compiled_chunk_writer(lua_State *ls, const void *p,
+                                      size_t sz, void *ud)
+{
+    std::ostringstream &out = *static_cast<std::ostringstream*>(ud);
+    out.write((const char *) p, sz);
+    return (0);
+}
+
 ///////////////////////////////////////////////////////////////////////////
 // dlua_chunk
 
@@ -51,6 +61,31 @@ dlua_chunk::dlua_chunk(const std::string &_context)
     clear();
 }
 
+// Initialises a chunk from the function on the top of stack.
+// This function must not be a closure, i.e. must not have any upvalues.
+dlua_chunk::dlua_chunk(lua_State *ls)
+    : file(), chunk(), compiled(), context(), first(-1), last(-1), error()
+{
+    clear();
+
+    lua_stack_cleaner cln(ls);
+    std::ostringstream out;
+    const int err = lua_dump(ls, dlua_compiled_chunk_writer, &out);
+    if (err)
+    {
+        const char *e = lua_tostring(ls, -1);
+        error = e? e : "Unknown error compiling chunk";
+    }
+    compiled = out.str();
+}
+
+dlua_chunk dlua_chunk::precompiled(const std::string &chunk)
+{
+    dlua_chunk dchunk;
+    dchunk.compiled = chunk;
+    return (dchunk);
+}
+
 void dlua_chunk::write(FILE *outf) const
 {
     if (empty())
@@ -132,14 +167,6 @@ int dlua_chunk::check_op(CLua &interp, int err)
     return (err);
 }
 
-static int dlua_compiled_chunk_writer(lua_State *ls, const void *p,
-                                      size_t sz, void *ud)
-{
-    std::ostringstream &out = *static_cast<std::ostringstream*>(ud);
-    out.write((const char *) p, sz);
-    return (0);
-}
-
 int dlua_chunk::load(CLua &interp)
 {
     if (!compiled.empty())
@@ -263,6 +290,10 @@ std::string dlua_chunk::get_chunk_prefix(const std::string &sorig) const
 
 #define MAP(ls, n, var)                             \
     map_def *var = *(map_def **) luaL_checkudata(ls, n, MAP_METATABLE)
+#define DEVENT(ls, n, var) \
+    dgn_event *var = *(dgn_event **) luaL_checkudata(ls, n, DEVENT_METATABLE)
+#define MAPMARKER(ls, n, var) \
+    map_marker *var = *(map_marker **) luaL_checkudata(ls, n, MAPMARK_METATABLE)
 
 void dgn_reset_default_depth()
 {
@@ -859,6 +890,123 @@ static int dgn_feature_name(lua_State *ls)
             dungeon_feature_name(static_cast<dungeon_feature_type>(feat)));
 }
 
+static const char *dgn_event_type_names[] =
+{
+    "none", "turn", "mons_move", "player_move", "leave_level", "enter_level",
+    "player_los", "player_climb"
+};
+
+static dgn_event_type dgn_event_type_by_name(const std::string &name)
+{
+    for (unsigned i = 0; i < ARRAYSIZE(dgn_event_type_names); ++i)
+        if (dgn_event_type_names[i] == name)
+            return static_cast<dgn_event_type>(i? 1 << (i - 1) : 0);
+    return (DET_NONE);
+}
+
+static const char *dgn_event_type_name(unsigned evmask)
+{
+    if (evmask == 0)
+        return (dgn_event_type_names[0]);
+    
+    for (unsigned i = 1; i < ARRAYSIZE(dgn_event_type_names); ++i)
+        if (evmask & (1 << (i - 1)))
+            return (dgn_event_type_names[i]);
+
+    return (dgn_event_type_names[0]);
+}
+
+static void dgn_push_event_type(lua_State *ls, int n)
+{
+    if (lua_isstring(ls, n))
+        lua_pushnumber(ls, dgn_event_type_by_name(lua_tostring(ls, n)));
+    else if (lua_isnumber(ls, n))
+        lua_pushstring(ls, dgn_event_type_name(luaL_checkint(ls, n)));
+    else
+        lua_pushnil(ls);
+}
+
+static int dgn_dgn_event(lua_State *ls)
+{
+    const int start = lua_isuserdata(ls, 1)? 2 : 1;
+    int retvals = 0;
+    for (int i = start, nargs = lua_gettop(ls); i <= nargs; ++i)
+    {
+        dgn_push_event_type(ls, i);
+        retvals++;
+    }
+    return (retvals);
+}
+
+static int dgn_register_listener(lua_State *ls)
+{
+    unsigned mask = luaL_checkint(ls, 1);
+    MAPMARKER(ls, 2, mark);
+    map_lua_marker *listener = dynamic_cast<map_lua_marker*>(mark);
+    coord_def pos;
+    // Was a position supplied?
+    if (lua_gettop(ls) == 4)
+    {
+        pos.x = luaL_checkint(ls, 3);
+        pos.y = luaL_checkint(ls, 4);
+    }
+
+    dungeon_events.register_listener(mask, listener, pos);
+    return (0);
+}
+
+static int dgn_remove_listener(lua_State *ls)
+{
+    MAPMARKER(ls, 1, mark);
+    map_lua_marker *listener = dynamic_cast<map_lua_marker*>(mark);
+    coord_def pos;
+    // Was a position supplied?
+    if (lua_gettop(ls) == 3)
+    {
+        pos.x = luaL_checkint(ls, 2);
+        pos.y = luaL_checkint(ls, 3);
+    }
+    dungeon_events.remove_listener(listener, pos);
+    return (0);
+}
+
+static int dgn_remove_marker(lua_State *ls)
+{
+    MAPMARKER(ls, 1, mark);
+    env_remove_marker(mark);
+    return (0);
+}
+
+static int dgn_feature_desc(lua_State *ls)
+{
+    const dungeon_feature_type feat =
+        static_cast<dungeon_feature_type>(luaL_checkint(ls, 1));
+    const description_level_type dtype =
+        lua_isnumber(ls, 2)?
+        static_cast<description_level_type>(luaL_checkint(ls, 2)) :
+        description_type_by_name(lua_tostring(ls, 2));
+    const bool need_stop = lua_isboolean(ls, 3)? lua_toboolean(ls, 3) : false;
+    const std::string s =
+        feature_description(feat, NUM_TRAPS, false, dtype, need_stop);
+    lua_pushstring(ls, s.c_str());
+    return (1);
+}
+
+static int dgn_terrain_changed(lua_State *ls)
+{
+    dungeon_feature_type type = DNGN_UNSEEN;
+    if (lua_isnumber(ls, 3))
+        type = static_cast<dungeon_feature_type>(luaL_checkint(ls, 3));
+    else if (lua_isstring(ls, 3))
+        type = dungeon_feature_by_name(lua_tostring(ls, 3));
+    const bool affect_player =
+        lua_isboolean(ls, 4)? lua_toboolean(ls, 4) : true;
+    dungeon_terrain_changed( coord_def( luaL_checkint(ls, 1),
+                                        luaL_checkint(ls, 2) ),
+                             type, affect_player );
+    return (0);
+}
+
 static const struct luaL_reg dgn_lib[] =
 {
     { "default_depth", dgn_default_depth },
@@ -883,6 +1031,7 @@ static const struct luaL_reg dgn_lib[] =
     { "kitem", dgn_kitem },
     { "kmons", dgn_kmons },
     { "grid", dgn_grid },
+    { "terrain_changed", dgn_terrain_changed },
     { "points_connected", dgn_points_connected },
     { "any_point_connected", dgn_any_point_connected },
     { "has_exit_from", dgn_has_exit_from },
@@ -892,6 +1041,11 @@ static const struct luaL_reg dgn_lib[] =
     { "load_des_file", dgn_load_des_file },
     { "feature_number", dgn_feature_number },
     { "feature_name", dgn_feature_name },
+    { "dgn_event_type", dgn_dgn_event },
+    { "register_listener", dgn_register_listener },
+    { "remove_listener", dgn_remove_listener },
+    { "remove_marker", dgn_remove_marker },
+    { "feature_desc", dgn_feature_desc },
     { NULL, NULL }
 };
 
@@ -906,16 +1060,207 @@ static const struct luaL_reg crawl_lib[] =
     { NULL, NULL }
 };
 
+static int file_marshall(lua_State *ls)
+{
+    if (lua_gettop(ls) != 2)
+        luaL_error(ls, "Need two arguments: tag header and value");
+    tagHeader &th(*static_cast<tagHeader*>( lua_touserdata(ls, 1) ));
+    if (lua_isnumber(ls, 2))
+        marshallLong(th, luaL_checklong(ls, 2));
+    else if (lua_isstring(ls, 2))
+        marshallString(th, lua_tostring(ls, 2));
+    else if (lua_isfunction(ls, 2))
+    {
+        dlua_chunk chunk(ls);
+        marshallString(th, chunk.compiled_chunk());
+    }
+    return (0);
+}
+
+static int file_unmarshall_number(lua_State *ls)
+{
+    if (lua_gettop(ls) != 1)
+        luaL_error(ls, "Need tag header as one argument");
+    tagHeader &th(*static_cast<tagHeader*>( lua_touserdata(ls, 1) ));
+    lua_pushnumber(ls, unmarshallLong(th));
+    return (1);
+}
+
+static int file_unmarshall_string(lua_State *ls)
+{
+    if (lua_gettop(ls) != 1)
+        luaL_error(ls, "Need tag header as one argument");
+    tagHeader &th(*static_cast<tagHeader*>( lua_touserdata(ls, 1) ));
+    lua_pushstring(ls, unmarshallString(th).c_str());
+    return (1);
+}
+
+static int file_unmarshall_fn(lua_State *ls)
+{
+    if (lua_gettop(ls) != 1)
+        luaL_error(ls, "Need tag header as one argument");
+    tagHeader &th(*static_cast<tagHeader*>( lua_touserdata(ls, 1) ));
+    const std::string s(unmarshallString(th, LUA_CHUNK_MAX_SIZE));
+    dlua_chunk chunk = dlua_chunk::precompiled(s);
+    if (chunk.load(dlua))
+        lua_pushnil(ls);
+    return (1);
+}
+
+enum lua_persist_type
+{
+    LPT_NONE,
+    LPT_NUMBER,
+    LPT_STRING,
+    LPT_FUNCTION
+};
+
+static int file_marshall_meta(lua_State *ls)
+{
+    if (lua_gettop(ls) != 2)
+        luaL_error(ls, "Need two arguments: tag header and value");
+    
+    tagHeader &th(*static_cast<tagHeader*>( lua_touserdata(ls, 1) ));
+
+    lua_persist_type ptype = LPT_NONE;
+    if (lua_isnumber(ls, 2))
+        ptype = LPT_NUMBER;
+    else if (lua_isstring(ls, 2))
+        ptype = LPT_STRING;
+    else if (lua_isfunction(ls, 2))
+        ptype = LPT_FUNCTION;
+    else
+        luaL_error(ls, "Can marshall only numbers, strings and functions.");
+    marshallByte(th, ptype);
+    file_marshall(ls);
+    return (0);
+}
+
+static int file_unmarshall_meta(lua_State *ls)
+{
+    tagHeader &th(*static_cast<tagHeader*>( lua_touserdata(ls, 1) ));
+    const lua_persist_type ptype =
+        static_cast<lua_persist_type>(unmarshallByte(th));
+    switch (ptype)
+    {
+    case LPT_NUMBER:
+        return file_unmarshall_number(ls);
+    case LPT_STRING:
+        return file_unmarshall_string(ls);
+    case LPT_FUNCTION:
+        return file_unmarshall_fn(ls);
+    default:
+        luaL_error(ls, "Unexpected type signature.");
+    }
+    // Never get here.
+    return (0);
+}
+
+static const struct luaL_reg file_lib[] =
+{
+    { "marshall",   file_marshall },
+    { "marshall_meta", file_marshall_meta },
+    { "unmarshall_meta", file_unmarshall_meta },
+    { "unmarshall_number", file_unmarshall_number },
+    { "unmarshall_string", file_unmarshall_string },
+    { "unmarshall_fn", file_unmarshall_fn },
+    { NULL, NULL }
+};
+
+LUARET1(you_can_hear_pos, boolean,
+        player_can_hear(luaL_checkint(ls,1), luaL_checkint(ls, 2)))
+
+static const struct luaL_reg you_lib[] =
+{
+    { "hear_pos", you_can_hear_pos },
+    { NULL, NULL }
+};
+
+static int dgnevent_type(lua_State *ls)
+{
+    DEVENT(ls, 1, dev);
+    PLUARET(number, dev->type);
+}
+
+static int dgnevent_place(lua_State *ls)
+{
+    DEVENT(ls, 1, dev);
+    lua_pushnumber(ls, dev->place.x);
+    lua_pushnumber(ls, dev->place.y);
+    return (2);
+}
+
+static int dgnevent_ticks(lua_State *ls)
+{
+    DEVENT(ls, 1, dev);
+    PLUARET(number, dev->elapsed_ticks);
+}
+
+static const struct luaL_reg dgnevent_lib[] =
+{
+    { "type",  dgnevent_type },
+    { "pos", dgnevent_place },
+    { "ticks", dgnevent_ticks },
+    { NULL, NULL }
+};
+
+static void luaopen_setmeta(lua_State *ls, 
+                            const char *global,
+                            const luaL_reg *lua_lib,
+                            const char *meta)
+{
+    luaL_newmetatable(ls, meta);
+    lua_setglobal(ls, global);
+
+    luaL_openlib(ls, global, lua_lib, 0);
+    
+    // Do <global>.__index = <global>
+    lua_pushstring(ls, "__index");
+    lua_pushvalue(ls, -2);
+    lua_settable(ls, -3);
+}
+
+static void luaopen_dgnevent(lua_State *ls)
+{
+    luaopen_setmeta(ls, "dgnevent", dgnevent_lib, DEVENT_METATABLE);
+}
+
+static int mapmarker_pos(lua_State *ls)
+{
+    MAPMARKER(ls, 1, mark);
+    lua_pushnumber(ls, mark->pos.x);
+    lua_pushnumber(ls, mark->pos.y);
+    return (2);
+}
+
+static const struct luaL_reg mapmarker_lib[] =
+{
+    { "pos", mapmarker_pos },
+    { NULL, NULL }
+};
+
+static void luaopen_mapmarker(lua_State *ls)
+{
+    luaopen_setmeta(ls, "mapmarker", mapmarker_lib, MAPMARK_METATABLE);
+}
+
 void init_dungeon_lua()
 {
+    lua_stack_cleaner clean(dlua);
+    
     luaL_openlib(dlua, "dgn", dgn_lib, 0);
     // Add additional function to the Crawl module.
     luaL_openlib(dlua, "crawl", crawl_lib, 0);
+    luaL_openlib(dlua, "file", file_lib, 0);
+    luaL_openlib(dlua, "you", you_lib, 0);
+    
     dlua.execfile("clua/dungeon.lua", true, true);
-    if (!dlua.error.empty())
-        end(1, false, "Lua error: %s", dlua.error.c_str());
+    dlua.execfile("clua/luamark.lua", true, true);
+    
     lua_getglobal(dlua, "dgn_run_map");
     luaopen_debug(dlua);
     luaL_newmetatable(dlua, MAP_METATABLE);
-    lua_settop(dlua, 1);
+
+    luaopen_dgnevent(dlua);
+    luaopen_mapmarker(dlua);
 }
diff --git a/crawl-ref/source/luadgn.h b/crawl-ref/source/luadgn.h
index d717f38f5f..04e85c2de0 100644
--- a/crawl-ref/source/luadgn.h
+++ b/crawl-ref/source/luadgn.h
@@ -43,6 +43,10 @@ public:
 
 public:
     dlua_chunk(const std::string &_context = "dlua_chunk");
+    dlua_chunk(lua_State *ls);
+
+    static dlua_chunk precompiled(const std::string &compiled);
+    
     void clear();
     void add(int line, const std::string &line);
     void set_chunk(const std::string &s);
@@ -57,6 +61,8 @@ public:
     
     bool empty() const;
 
+    const std::string &compiled_chunk() const { return compiled; }
+    
     void write(FILE *) const;
     void read(FILE *);
 };
@@ -69,6 +75,13 @@ int dlua_stringtable(lua_State *ls, const std::vector<std::string> &s);
 dungeon_feature_type dungeon_feature_by_name(const std::string &name);
 const char *dungeon_feature_name(dungeon_feature_type feat);
 
+template <typename T>
+inline void dlua_push_userdata(lua_State *ls, T udata, const char *meta)
+{
+    T *de = clua_new_userdata<T>(ls, meta);
+    *de = udata;
+}
+
 //////////////////////////////////////////////////////////////////////////
 
 #endif
diff --git a/crawl-ref/source/mapdef.cc b/crawl-ref/source/mapdef.cc
index a5854ae236..6e5e5c7c8d 100644
--- a/crawl-ref/source/mapdef.cc
+++ b/crawl-ref/source/mapdef.cc
@@ -302,9 +302,9 @@ map_transformer::~map_transformer()
 // map_lines
 
 map_lines::map_lines()
-    : transforms(), markers(), lines(), map_width(0), solid_north(false),
-      solid_east(false), solid_south(false), solid_west(false),
-      solid_checked(false)
+    : transforms(), markers(), lines(), map_width(0),
+      solid_north(false), solid_east(false), solid_south(false),
+      solid_west(false), solid_checked(false)
 {
 }
 
@@ -1023,9 +1023,9 @@ dlua_set_map::~dlua_set_map()
 
 map_def::map_def()
     : name(), tags(), place(), depths(), orient(), chance(),
-      map(), mons(), items(), keyspecs(), prelude("dlprelude"), main("dlmain"),
-      validate("dlvalidate"), veto("dlveto"), index_only(false),
-      cache_offset(0L)
+      map(), mons(), items(), keyspecs(), prelude("dlprelude"),
+      main("dlmain"), validate("dlvalidate"), veto("dlveto"),
+      index_only(false), cache_offset(0L)
 {
     init();
 }
@@ -1330,6 +1330,7 @@ std::string map_def::validate_map_def()
         break;
     }
 
+    dlua_set_map dl(this);
     return (map.apply_transforms());
 }
 
@@ -1574,6 +1575,7 @@ void map_def::normalise()
 
 std::string map_def::resolve()
 {
+    dlua_set_map dl(this);
     return map.apply_transforms();
 }
 
@@ -2306,27 +2308,27 @@ std::string shuffle_spec::describe() const
 std::string map_marker_spec::apply_transform(map_lines &map)
 {
     std::vector<coord_def> positions = map.find_glyph(key);
-    if (positions.size() == 1)
+    if (positions.empty())
+        return make_stringf("cant find key '%c' for marker", key);
+
+    for (int i = 0, size = positions.size(); i < size; ++i)
     {
         try
         {
-            map_marker *mark = map_marker::parse_marker(marker);
+            map_marker *mark =
+                map_marker::parse_marker(marker);
             if (!mark)
                 return make_stringf("Unable to parse marker from %s",
                                     marker.c_str());
-            mark->pos = positions[0];
+            mark->pos = positions[i];
             map.add_marker(mark);
-            return ("");
         }
         catch (const std::string &err)
         {
             return (err);
         }
     }
-    else if (positions.empty())
-        return make_stringf("cant find key '%c' for marker", key);
-    else
-        return make_stringf("too many matches for key '%c' for marker", key);
+    return ("");
 }
 
 map_transformer::transform_type map_marker_spec::type() const
@@ -2436,15 +2438,13 @@ feature_spec_list keyed_mapspec::parse_feature(const std::string &str)
         list.push_back( parse_shop(s, weight) );
         return (list);
     }
-    
-    std::vector<dungeon_feature_type> feats =
-        features_by_desc( glob_pattern(s, true) );
-    if (!feats.empty())
-        list.push_back( feature_spec(feats[0], weight) );
 
-    if (feats.empty())
+    const dungeon_feature_type ftype = dungeon_feature_by_name(s);
+    if (ftype == DNGN_UNSEEN)
         err = make_stringf("no features matching \"%s\"",
                            str.c_str());
+    else
+        list.push_back( feature_spec( ftype, weight ) );
     
     return (list);
 }
diff --git a/crawl-ref/source/mapdef.h b/crawl-ref/source/mapdef.h
index 9ff325bcca..d1a0316aad 100644
--- a/crawl-ref/source/mapdef.h
+++ b/crawl-ref/source/mapdef.h
@@ -167,6 +167,7 @@ struct map_marker_spec : public map_transformer
     map_transformer *clone() const;
 };
 
+class map_def;
 class map_lines
 {
 public:
@@ -260,6 +261,7 @@ private:
     friend class subst_spec;
     friend class nsubst_spec;
     friend class shuffle_spec;
+    friend class map_marker_spec;
     
 private:
     std::vector<map_transformer *> transforms;
diff --git a/crawl-ref/source/mapmark.cc b/crawl-ref/source/mapmark.cc
index 696f042b4c..4867225072 100644
--- a/crawl-ref/source/mapmark.cc
+++ b/crawl-ref/source/mapmark.cc
@@ -9,6 +9,7 @@
 #include "AppHdr.h"
 #include "mapmark.h"
 
+#include "clua.h"
 #include "direct.h"
 #include "libutil.h"
 #include "luadgn.h"
@@ -22,13 +23,13 @@
 map_marker::marker_reader map_marker::readers[NUM_MAP_MARKER_TYPES] =
 {
     &map_feature_marker::read,
-    &map_timed_feature_marker::read,
+    &map_lua_marker::read,
 };
 
 map_marker::marker_parser map_marker::parsers[NUM_MAP_MARKER_TYPES] =
 {
     &map_feature_marker::parse,
-    &map_timed_feature_marker::parse,
+    &map_lua_marker::parse,
 };
 
 map_marker::map_marker(map_marker_type t, const coord_def &p)
@@ -64,13 +65,14 @@ map_marker *map_marker::read_marker(tagHeader &inf)
     return readers[type]? (*readers[type])(inf, type) : NULL;
 }
 
-map_marker *map_marker::parse_marker(const std::string &s) throw (std::string)
+map_marker *map_marker::parse_marker(
+    const std::string &s, const std::string &ctx) throw (std::string)
 {
     for (int i = 0; i < NUM_MAP_MARKER_TYPES; ++i)
     {
         if (parsers[i])
         {
-            if (map_marker *m = parsers[i](s))
+            if (map_marker *m = parsers[i](s, ctx))
                 return (m);
         }
     }
@@ -112,7 +114,8 @@ map_marker *map_feature_marker::read(tagHeader &inf, map_marker_type)
     return (mapf);
 }
 
-map_marker *map_feature_marker::parse(const std::string &s) throw (std::string)
+map_marker *map_feature_marker::parse(
+    const std::string &s, const std::string &) throw (std::string)
 {
     if (s.find("feat:") != 0)
         return (NULL);
@@ -132,190 +135,195 @@ std::string map_feature_marker::describe() const
 }
 
 ////////////////////////////////////////////////////////////////////////////
-// map_feature_marker
+// map_lua_marker
 
-map_timed_feature_marker::map_timed_feature_marker(
-    const coord_def &_pos,
-    int duration_turns,
-    dungeon_feature_type _feat)
-    : map_feature_marker(_pos, _feat), duration_ticks(duration_turns * 10),
-      warn_threshold(-1000)
+map_lua_marker::map_lua_marker()
+    : map_marker(MAT_LUA_MARKER, coord_def()), initialised(false)
 {
-    type = MAT_TIMED_FEATURE;
 }
 
-void map_timed_feature_marker::activate()
+map_lua_marker::map_lua_marker(const std::string &s, const std::string &)
+    : map_marker(MAT_LUA_MARKER, coord_def()), initialised(false)
 {
-    dungeon_events.register_listener(DET_TURN_ELAPSED, this);
+    lua_stack_cleaner clean(dlua);
+    if (dlua.loadstring(("return " + s).c_str(), "lua_marker"))
+        mprf(MSGCH_WARN, "lua_marker load error: %s", dlua.error.c_str());
+    if (!dlua.callfn("dgn_run_map", 1, 1))
+        mprf(MSGCH_WARN, "lua_marker exec error: %s", dlua.error.c_str());
+    check_register_table();
+}
 
-    if (player_can_hear(pos))
+map_lua_marker::~map_lua_marker()
+{
+    // Remove the Lua marker table from the registry.
+    if (initialised)
     {
-        const dungeon_feature_type ft = grd(pos);
-        switch (ft)
-        {
-        case DNGN_ENTER_BAZAAR:
-            mprf(MSGCH_SOUND, "You %shear coins being counted.",
-                 duration_ticks < 1000? "can faintly " : "");
-            break;
-        case DNGN_ENTER_LABYRINTH:
-            mprf(MSGCH_SOUND, "You hear a faint echoing snort.");
-            break;
-        default:
-            break;
-        }
+        lua_pushlightuserdata(dlua, this);
+        lua_pushnil(dlua);
+        lua_settable(dlua, LUA_REGISTRYINDEX);
     }
 }
 
-void map_timed_feature_marker::write(tagHeader &th) const
+void map_lua_marker::check_register_table()
 {
-    map_feature_marker::write(th);
-    marshallShort(th, duration_ticks);
-    marshallShort(th, warn_threshold);
-}
+    if (!lua_istable(dlua, -1))
+    {
+        mprf(MSGCH_WARN, "lua_marker: Expected table, didn't get it.");
+        initialised = false;
+        return;
+    }
 
-void map_timed_feature_marker::read(tagHeader &th)
-{
-    map_feature_marker::read(th);
-    duration_ticks = unmarshallShort(th);
-    warn_threshold = unmarshallShort(th);
-}
+    // Got a table. Save it in the registry.
 
-std::string map_timed_feature_marker::describe() const
-{
-    return make_stringf("timer: %d ticks (%s)",
-                        duration_ticks, dungeon_feature_name(feat));
+    // Key is this.
+    lua_pushlightuserdata(dlua, this);
+    // Move key before value.
+    lua_insert(dlua, -2);
+    lua_settable(dlua, LUA_REGISTRYINDEX);
+
+    initialised = true;
 }
 
-const char *map_timed_feature_marker::bell_urgency(int ticks) const
+bool map_lua_marker::get_table() const
 {
-    if (ticks > 5000)
-        return "stately ";
-    else if (ticks > 4000)
-        return "";
-    else if (ticks > 2500)
-        return "brisk ";
-    else if (ticks > 1500)
-        return "urgent ";
-    else if (ticks > 0)
-        return "frantic ";
-    else
-        return "last, dying notes of the ";
+    // First save the unmarshall Lua function.
+    lua_pushlightuserdata(dlua, const_cast<map_lua_marker*>(this));
+    lua_gettable(dlua, LUA_REGISTRYINDEX);
+    return (lua_istable(dlua, -1));
 }
 
-const char *map_timed_feature_marker::noise_maker(int ticks) const
+void map_lua_marker::write(tagHeader &th) const
 {
-    switch (grd(pos))
+    map_marker::write(th);
+    
+    lua_stack_cleaner clean(dlua);
+    bool init = initialised;
+    if (!get_table())
     {
-    case DNGN_ENTER_LABYRINTH:
-        return (ticks > 0? "tolling of a bell" : "bell");
-    case DNGN_ENTER_BAZAAR:
-        return (ticks > 0? "ticking of an ancient clock" : "clock");
-    default:
-        return (ticks > 0?
-                "trickling of a stream filled with giant, killer bugs."
-                : "stream");
+        mprf(MSGCH_WARN, "Couldn't find table.");
+        init = false;
     }
+    
+    marshallByte(th, init);
+    if (!init)
+        return;
+
+    // Call dlua_marker_function(table, 'read')
+    lua_pushstring(dlua, "read");
+    if (!dlua.callfn("dlua_marker_function", 2, 1))
+        end(1, false, "lua_marker: write error: %s", dlua.error.c_str());
+
+    // Right, what's on top should be a function. Save it.
+    dlua_chunk reader(dlua);
+    if (!reader.error.empty())
+        end(1, false, "lua_marker: couldn't save read function: %s",
+            reader.error.c_str());
+
+    marshallString(th, reader.compiled_chunk());
+
+    // Okay, saved the reader. Now ask the writer to do its thing.
+
+    // Call: dlua_marker_method(table, fname, marker)
+    get_table();
+    lua_pushstring(dlua, "write");
+    lua_pushlightuserdata(dlua, const_cast<map_lua_marker*>(this));
+    lua_pushlightuserdata(dlua, &th);
+
+    if (!dlua.callfn("dlua_marker_method", 4))
+        end(1, false, "lua_marker::write error: %s", dlua.error.c_str());
 }
 
-void map_timed_feature_marker::notify_dgn_event(const dgn_event &e)
+void map_lua_marker::read(tagHeader &th)
 {
-    if (!e.elapsed_ticks || e.type != DET_TURN_ELAPSED)
+    map_marker::read(th);
+    
+    if (!(initialised = unmarshallByte(th)))
         return;
 
-    if (warn_threshold == -1000)
-        warn_threshold = std::max(50, duration_ticks - 500);
-    
-    duration_ticks -= e.elapsed_ticks;
+    lua_stack_cleaner cln(dlua);
+    // Read the Lua chunk we saved.
+    const std::string compiled = unmarshallString(th, LUA_CHUNK_MAX_SIZE);
 
-    if (duration_ticks < warn_threshold || duration_ticks <= 0)
-    {
-        if (duration_ticks > 900)
-            warn_threshold = duration_ticks - 500;
-        else
-            warn_threshold = duration_ticks - 250;
-
-        if (duration_ticks > 0 && player_can_hear(pos))
-            mprf(MSGCH_SOUND, "You hear the %s%s.",
-                 bell_urgency(duration_ticks),
-                 noise_maker(duration_ticks));
-
-        if (duration_ticks <= 0)
-            timeout(true);
-    }
+    dlua_chunk chunk = dlua_chunk::precompiled(compiled);
+    if (chunk.load(dlua))
+        end(1, false, "lua_marker::read error: %s", chunk.error.c_str());
+    dlua_push_userdata(dlua, this, MAPMARK_METATABLE);
+    lua_pushlightuserdata(dlua, &th);
+    if (!dlua.callfn("dlua_marker_read", 3, 1))
+        end(1, false, "lua_marker::read error: %s", dlua.error.c_str());
+
+    // Right, what's on top had better be a table.
+    check_register_table();
 }
 
-void map_timed_feature_marker::timeout(bool verbose)
+map_marker *map_lua_marker::read(tagHeader &th, map_marker_type)
 {
-    if (verbose)
-    {
-        if (see_grid(pos))
-            mprf("%s disappears!",
-                 feature_description(grd(pos), NUM_TRAPS, false,
-                                     DESC_CAP_THE, false).c_str());
-        else
-            mpr("The walls and floor vibrate strangely for a moment.");
-    }
+    map_marker *marker = new map_lua_marker;
+    marker->read(th);
+    return (marker);
+}
 
-    // And it's gone forever.
-    grd(pos) = feat;
+void map_lua_marker::push_fn_args(const char *fn) const
+{
+    get_table();
+    lua_pushstring(dlua, fn);
+    dlua_push_userdata(dlua, this, MAPMARK_METATABLE);
+}
 
-    dungeon_terrain_changed(pos);
+bool map_lua_marker::callfn(const char *fn, bool warn_err) const
+{
+    const int top = lua_gettop(dlua);
+    push_fn_args(fn);
+    const bool res =
+        dlua.callfn("dlua_marker_method", lua_gettop(dlua) - top, 1);
+    if (!res && warn_err)
+        mprf(MSGCH_WARN, "mlua error: %s", dlua.error.c_str());
+    return (res);
+}
 
-    // Stop listening for further ticks.
-    dungeon_events.remove_listener(this);
+void map_lua_marker::activate()
+{
+    lua_stack_cleaner clean(dlua);
+    callfn("activate", true);
+}
 
-    // Kill this marker.
-    env_remove_marker(this);
+void map_lua_marker::notify_dgn_event(const dgn_event &e)
+{
+    lua_stack_cleaner clean(dlua);
+    push_fn_args("event");
+    clua_push_dgn_event(dlua, &e);
+    if (!dlua.callfn("dlua_marker_method", 4, 0))
+        mprf(MSGCH_WARN, "notify_dgn_event: Lua error: %s",
+             dlua.error.c_str());
 }
 
-map_marker *map_timed_feature_marker::read(tagHeader &th, map_marker_type)
+std::string map_lua_marker::describe() const
 {
-    map_marker *mt = new map_timed_feature_marker();
-    mt->read(th);
-    return (mt);
+    lua_stack_cleaner cln(dlua);
+    if (!callfn("describe"))
+        return make_stringf("error: %s", dlua.error.c_str());
+
+    std::string desc;
+    if (lua_isstring(dlua, -1))
+        desc = lua_tostring(dlua, -1);
+    return desc;
 }
 
-map_marker *map_timed_feature_marker::parse(const std::string &s)
-    throw (std::string)
+map_marker *map_lua_marker::parse(
+    const std::string &s, const std::string &ctx) throw (std::string)
 {
-    if (s.find("timer:") != 0)
+    if (s.find("lua:") != 0)
         return (NULL);
     std::string raw = s;
-    strip_tag(raw, "timer:", true);
-
-    int navg = strip_number_tag(raw, "avg:");
-    if (navg == TAG_UNFOUND)
-        navg = 1;
-
-    if (navg < 1 || navg > 20)
-        throw make_stringf("Bad marker spec '%s' (avg out of bounds)",
-                           s.c_str());
-
-    dungeon_feature_type feat = DNGN_FLOOR;
-    std::string fname = strip_tag_prefix(raw, "feat:");
-    if (!fname.empty()
-        && (feat = dungeon_feature_by_name(fname)) == DNGN_UNSEEN)
+    strip_tag(raw, "lua:");
+    map_lua_marker *mark = new map_lua_marker(raw, ctx);
+    if (!mark->initialised)
     {
-        throw make_stringf("Bad feature name (%s) in marker spec '%s'",
-                           fname.c_str(), s.c_str());
+        delete mark;
+        throw make_stringf("Unable to initialise Lua marker from '%s'",
+                           raw.c_str());
     }
-    
-    std::vector<std::string> limits = split_string("-", raw);
-    const int nlims = limits.size();
-    if (nlims < 1 || nlims > 2)
-        throw make_stringf("Malformed turn range (%s) in marker '%s'",
-                           raw.c_str(), s.c_str());
-
-    const int low = atoi(limits[0].c_str());
-    const int high = nlims == 1? low : atoi(limits[1].c_str());
-
-    if (low == 0 || high < low)
-        throw make_stringf("Malformed turn range (%s) in marker '%s'",
-                           raw.c_str(), s.c_str());
-
-    const int duration = low == high? low : random_range(low, high, navg);
-    return new map_timed_feature_marker(coord_def(0, 0),
-                                        duration, feat);
+    return (mark);
 }
 
 //////////////////////////////////////////////////////////////////////////
diff --git a/crawl-ref/source/mapmark.h b/crawl-ref/source/mapmark.h
index 31d0b74e29..eacddcf266 100644
--- a/crawl-ref/source/mapmark.h
+++ b/crawl-ref/source/mapmark.h
@@ -3,6 +3,8 @@
 
 #include "dungeon.h"
 #include "dgnevent.h"
+#include "clua.h"
+#include "luadgn.h"
 
 //////////////////////////////////////////////////////////////////////////
 // Map markers
@@ -11,7 +13,7 @@
 enum map_marker_type
 {
     MAT_FEATURE,              // Stock marker.
-    MAT_TIMED_FEATURE,
+    MAT_LUA_MARKER,
     NUM_MAP_MARKER_TYPES,
     MAT_ANY
 };
@@ -30,7 +32,8 @@ public:
     virtual std::string describe() const = 0;
     
     static map_marker *read_marker(tagHeader&);
-    static map_marker *parse_marker(const std::string &text)
+    static map_marker *parse_marker(const std::string &text,
+                                    const std::string &ctx = "")
         throw (std::string);
 
 public:
@@ -40,7 +43,8 @@ protected:
     map_marker_type type;
 
     typedef map_marker *(*marker_reader)(tagHeader &, map_marker_type);
-    typedef map_marker *(*marker_parser)(const std::string &);
+    typedef map_marker *(*marker_parser)(const std::string &,
+                                         const std::string &);
     static marker_reader readers[NUM_MAP_MARKER_TYPES];
     static marker_parser parsers[NUM_MAP_MARKER_TYPES];
 };
@@ -55,39 +59,39 @@ public:
     void read(tagHeader &);
     std::string describe() const;
     static map_marker *read(tagHeader &, map_marker_type);
-    static map_marker *parse(const std::string &s) throw (std::string);
+    static map_marker *parse(const std::string &s, const std::string &)
+        throw (std::string);
     
 public:
     dungeon_feature_type feat;
 };
 
-class map_timed_feature_marker : public map_feature_marker, dgn_event_listener
+// A marker powered by Lua.
+class map_lua_marker : public map_marker, public dgn_event_listener
 {
 public:
-    map_timed_feature_marker(const coord_def &pos = coord_def(),
-                             int duration_turns = 0,
-                             dungeon_feature_type feat = DNGN_FLOOR);
+    map_lua_marker();
+    map_lua_marker(const std::string &s, const std::string &ctx);
+    ~map_lua_marker();
+
     void activate();
+
     void write(tagHeader &) const;
     void read(tagHeader &);
     std::string describe() const;
-
+ 
     void notify_dgn_event(const dgn_event &e);
-
-    // Expires this marker *now* and cleans it up.
-    void timeout(bool verbose);
-    
+   
     static map_marker *read(tagHeader &, map_marker_type);
-    static map_marker *parse(const std::string &s) throw (std::string);
-
+    static map_marker *parse(const std::string &s, const std::string &)
+        throw (std::string);
 private:
-    const char *bell_urgency(int ticks) const; 
-    const char *noise_maker(int ticks) const;
-   
-public:
-    // Ticks are a tenth of a turn.
-    int duration_ticks;
-    int warn_threshold;
+    bool initialised;
+private:
+    void check_register_table();
+    bool get_table() const;
+    void push_fn_args(const char *fn) const;
+    bool callfn(const char *fn, bool warn_err = false) const;
 };
 
 void env_activate_markers();
diff --git a/crawl-ref/source/message.cc b/crawl-ref/source/message.cc
index 9789881fbb..bef5843dca 100644
--- a/crawl-ref/source/message.cc
+++ b/crawl-ref/source/message.cc
@@ -372,6 +372,12 @@ void mprf( const char *format, ... )
 
 void mpr(const char *inf, int channel, int param)
 {
+    if (!crawl_state.io_inited)
+    {
+        if (channel == MSGCH_WARN)
+            fprintf(stderr, "%s\n", inf);
+        return;
+    }
     char mbuf[400];
     size_t i = 0;
     const int stepsize = get_number_of_cols() - 1;
diff --git a/crawl-ref/source/misc.cc b/crawl-ref/source/misc.cc
index 94bf165bf4..f94624ff39 100644
--- a/crawl-ref/source/misc.cc
+++ b/crawl-ref/source/misc.cc
@@ -535,10 +535,20 @@ static void dgn_check_terrain_monsters(const coord_def &pos)
     }
 }
 
-void dungeon_terrain_changed(const coord_def &pos)
+void dungeon_terrain_changed(const coord_def &pos,
+                             dungeon_feature_type nfeat,
+                             bool affect_player)
 {
+    if (nfeat != DNGN_UNSEEN)
+    {
+        unnotice_feature(level_pos(level_id::current(), pos));
+        grd(pos) = nfeat;
+        if (is_notable_terrain(nfeat) && see_grid(pos))
+            seen_notable_thing(nfeat, pos.x, pos.y);
+    }
+    
     dgn_check_terrain_items(pos);
-    if (pos == you.pos())
+    if (affect_player && pos == you.pos())
     {
         if (!grid_is_solid(grd(pos)))
         {
@@ -776,6 +786,12 @@ static void climb_message(dungeon_feature_type stair, bool going_up)
         mpr(going_up? "You climb upwards." : "You climb downwards.");
 }
 
+static void leaving_level_now()
+{
+    dungeon_events.fire_position_event(DET_PLAYER_CLIMBS, you.pos());
+    dungeon_events.fire_event(DET_LEAVING_LEVEL);
+}
+
 void up_stairs(void)
 {
     dungeon_feature_type stair_find = grd[you.x_pos][you.y_pos];
@@ -828,6 +844,7 @@ void up_stairs(void)
     }
 
     // Checks are done, the character is committed to moving between levels.
+    leaving_level_now();
     exit_stair_message(stair_find, true);
     
     int old_level  = you.your_level;
@@ -1028,6 +1045,9 @@ void down_stairs( int old_level, dungeon_feature_type force_stair )
     }
 
     // All checks are done, the player is on the move now.
+
+    // Fire level-leaving trigger.
+    leaving_level_now();
     exit_stair_message(stair_find, false);
     
 #ifdef DGL_MILESTONES
@@ -1132,16 +1152,8 @@ void down_stairs( int old_level, dungeon_feature_type force_stair )
         }
     }
 
-    if (stair_find == DNGN_ENTER_LABYRINTH || stair_find == DNGN_ENTER_BAZAAR)
-    {
-        // no longer a feature
-        if (stair_find == DNGN_ENTER_LABYRINTH)
-            unnotice_labyrinth_portal();
-        grd[you.x_pos][you.y_pos] = DNGN_FLOOR;
-        // remove any markers that were going to expire this labyrinth.
-        if (map_marker *marker = env_find_marker(you.pos(), MAT_TIMED_FEATURE))
-            dynamic_cast<map_timed_feature_marker*>(marker)->timeout(false);
-    }
+    if (stair_find == DNGN_ENTER_LABYRINTH)
+        dungeon_terrain_changed(you.pos(), DNGN_FLOOR);
 
     if (stair_find == DNGN_ENTER_LABYRINTH)
     {
diff --git a/crawl-ref/source/misc.h b/crawl-ref/source/misc.h
index 37477745fd..7bbfd4a602 100644
--- a/crawl-ref/source/misc.h
+++ b/crawl-ref/source/misc.h
@@ -171,7 +171,9 @@ void setup_environment_effects();
 void run_environment_effects();
 
 // Terrain changed under 'pos', perform necessary effects.
-void dungeon_terrain_changed(const coord_def &pos);
+void dungeon_terrain_changed(const coord_def &pos,
+                             dungeon_feature_type feat = DNGN_UNSEEN,
+                             bool affect_player = true);
 
 //////////////////////////////////////////////////////////////////////
 // Places and names
diff --git a/crawl-ref/source/mon-util.cc b/crawl-ref/source/mon-util.cc
index 1dc3d462fd..15194b25b2 100644
--- a/crawl-ref/source/mon-util.cc
+++ b/crawl-ref/source/mon-util.cc
@@ -33,6 +33,7 @@
 #include "beam.h"
 #include "debug.h"
 #include "delay.h"
+#include "dgnevent.h"
 #include "itemname.h"
 #include "itemprop.h"
 #include "items.h"
@@ -4225,6 +4226,17 @@ void monsters::check_redraw(const coord_def &old) const
     }
 }
 
+void monsters::apply_location_effects()
+{
+    dungeon_events.fire_position_event(DET_MONSTER_MOVED, pos());
+    
+    // monsters stepping on traps:
+    mons_trap(this);
+
+    if (alive())
+        mons_check_pool(this);
+}
+    
 /////////////////////////////////////////////////////////////////////////
 // mon_enchant
 
diff --git a/crawl-ref/source/monstuff.cc b/crawl-ref/source/monstuff.cc
index f7b3f495fc..13ef4ef37f 100644
--- a/crawl-ref/source/monstuff.cc
+++ b/crawl-ref/source/monstuff.cc
@@ -1189,6 +1189,7 @@ bool monster_blink(monsters *monster)
 
     mgrd[monster->x][monster->y] = NON_MONSTER;
 
+    const coord_def oldplace = monster->pos();
     monster->x = nx;
     monster->y = ny;
 
@@ -1197,6 +1198,9 @@ bool monster_blink(monsters *monster)
     if (player_monster_visible(monster) && mons_near(monster))
         seen_monster(monster);
 
+    monster->check_redraw(oldplace);
+    monster->apply_location_effects();
+
     return (true);
 }                               // end monster_blink()
 
@@ -4131,9 +4135,8 @@ static bool monster_swaps_places( monsters *mon, int mx, int my )
     immobile_monster[m2i] = true;
 
     mon->check_redraw(coord_def(cx, cy));
-
-    mons_trap(mon);
-    mons_trap(m2);
+    mon->apply_location_effects();
+    m2->apply_location_effects();
 
     return (false);
 }
@@ -4186,12 +4189,7 @@ static void do_move_monster(monsters *monster, int xi, int yi)
     mgrd[monster->x][monster->y] = monster_index(monster);
 
     monster->check_redraw(monster->pos() - coord_def(xi, yi));
-    
-    // monsters stepping on traps:
-    mons_trap(monster);
-
-    if (monster->alive())
-        mons_check_pool(monster);
+    monster->apply_location_effects();
 }
 
 void mons_check_pool(monsters *mons, killer_type killer, int killnum)
diff --git a/crawl-ref/source/mstuff2.cc b/crawl-ref/source/mstuff2.cc
index 5612953152..2a48a3fc35 100644
--- a/crawl-ref/source/mstuff2.cc
+++ b/crawl-ref/source/mstuff2.cc
@@ -835,8 +835,9 @@ void monster_teleport(struct monsters *monster, bool instan, bool silent)
     if (!silent)
         simple_monster_message(monster, " disappears!");
 
+    const coord_def oldplace = monster->pos();
     // pick the monster up
-    mgrd[monster->x][monster->y] = NON_MONSTER;
+    mgrd(oldplace) = NON_MONSTER;
 
     int newx, newy;
     while(true)
@@ -880,6 +881,9 @@ void monster_teleport(struct monsters *monster, bool instan, bool silent)
     if (player_monster_visible(monster) && now_visible)
         seen_monster(monster);
 
+    monster->check_redraw(oldplace);
+    monster->apply_location_effects();
+
     // Teleporting mimics change form - if they reappear out of LOS, they are
     // no longer known.
     if (mons_is_mimic(monster->type))
diff --git a/crawl-ref/source/overmap.cc b/crawl-ref/source/overmap.cc
index 1fa8d5ddee..078e3f3415 100644
--- a/crawl-ref/source/overmap.cc
+++ b/crawl-ref/source/overmap.cc
@@ -26,6 +26,7 @@
 #include "externs.h"
 
 #include "branch.h"
+#include "dgnevent.h"
 #include "direct.h"
 #include "files.h"
 #include "menu.h"
@@ -46,11 +47,16 @@ altar_map_type altars_present;
 portal_map_type portals_present;
 
 static void seen_altar( god_type god, const coord_def& pos );
-static void seen_staircase(unsigned char which_staircase,const coord_def& pos);
-static void seen_other_thing(unsigned char which_thing, const coord_def& pos);
+static void seen_staircase(dungeon_feature_type which_staircase,
+                           const coord_def& pos);
+static void seen_other_thing(dungeon_feature_type which_thing,
+                             const coord_def& pos);
 
 void seen_notable_thing( dungeon_feature_type which_thing, int x, int y )
 {
+    // Tell the world first.
+    dungeon_events.fire_position_event(DET_PLAYER_IN_LOS, coord_def(x, y));
+    
     // Don't record in temporary terrain
     if (you.level_type != LEVEL_DUNGEON)
         return;
@@ -348,16 +354,55 @@ std::string overview_description_string()
     return disp;
 }
 
-void unnotice_labyrinth_portal()
+template <typename Z, typename Key>
+inline static bool find_erase(Z &map, const Key &k)
 {
-    level_pos curpos(level_id::current());
-    // XXX Is there really no better way to do this?
-    curpos.pos.x = you.x_pos;
-    curpos.pos.y = you.y_pos;
-    if ( portals_present.find(curpos) != portals_present.end() )
-        portals_present.erase(curpos);
-    else
-        mprf(MSGCH_DIAGNOSTICS, "Oops - tried to unnotice bad portal.");
+    if (map.find(k) != map.end())
+    {
+        map.erase(k);
+        return (true);
+    }
+    return (false);
+}
+
+static bool unnotice_portal(const level_pos &pos)
+{
+    return find_erase(portals_present, pos);
+}
+
+static bool unnotice_altar(const level_pos &pos)
+{
+    return find_erase(altars_present, pos);
+}
+
+static bool unnotice_shop(const level_pos &pos)
+{
+    return find_erase(shops_present, pos);
+}
+
+static bool unnotice_stair(const level_pos &pos)
+{
+    const dungeon_feature_type feat = grd(pos.pos);
+    if (grid_is_branch_stairs(feat))
+    {
+        for (int i = 0; i < NUM_BRANCHES; ++i)
+        {
+            if (branches[i].entry_stairs == feat)
+            {
+                const branch_type br = static_cast<branch_type>(i);
+                return (find_erase(stair_level, br));
+            }
+        }
+    }
+    return (false);
+}
+
+bool unnotice_feature(const level_pos &pos)
+{
+    return (unnotice_portal(pos)
+            || unnotice_altar(pos)
+            || unnotice_shop(pos)
+            || unnotice_stair(pos));
 }
 
 void display_overmap()
@@ -369,7 +414,8 @@ void display_overmap()
     redraw_screen();
 }
 
-void seen_staircase( unsigned char which_staircase, const coord_def& pos )
+void seen_staircase( dungeon_feature_type which_staircase,
+                     const coord_def& pos )
 {
     // which_staircase holds the grid value of the stair, must be converted
     // Only handles stairs, not gates or arches
@@ -427,7 +473,7 @@ portal_type feature_to_portal( unsigned char feat )
 }
 
 // if player has seen any other thing; record it
-void seen_other_thing( unsigned char which_thing, const coord_def& pos )
+void seen_other_thing( dungeon_feature_type which_thing, const coord_def& pos )
 {
     if ( you.level_type != LEVEL_DUNGEON ) // can't record in abyss or pan.
         return;
diff --git a/crawl-ref/source/overmap.h b/crawl-ref/source/overmap.h
index 214073cecf..f9f16a71ad 100644
--- a/crawl-ref/source/overmap.h
+++ b/crawl-ref/source/overmap.h
@@ -18,8 +18,7 @@
 void seen_notable_thing( dungeon_feature_type which_thing, int x, int y );
 bool overmap_knows_portal(dungeon_feature_type portal);
 void display_overmap();
-void unnotice_labyrinth_portal();
-void unnotice_altar();
+bool unnotice_feature(const level_pos &pos);
 std::string overview_description_string();
 
 #endif
diff --git a/crawl-ref/source/player.cc b/crawl-ref/source/player.cc
index c3458c2eb7..1c6d08afe3 100644
--- a/crawl-ref/source/player.cc
+++ b/crawl-ref/source/player.cc
@@ -34,6 +34,7 @@
 
 #include "clua.h"
 #include "delay.h"
+#include "dgnevent.h"
 #include "effects.h"
 #include "fight.h"
 #include "food.h"
@@ -5523,14 +5524,16 @@ bool player::is_icy() const
 
 void player::moveto(int x, int y)
 {
-    x_pos = x;
-    y_pos = y;
-    crawl_view.set_player_at(coord_def(x, y));
+    moveto(coord_def(x, y));
 }
 
 void player::moveto(const coord_def &c)
 {
+    const bool real_move = c != pos();
     x_pos = c.x;
     y_pos = c.y;
     crawl_view.set_player_at(c);
+
+    if (real_move)
+        dungeon_events.fire_position_event(DET_PLAYER_MOVED, c);
 }
diff --git a/crawl-ref/source/tags.cc b/crawl-ref/source/tags.cc
index 5748975294..cc0e1648d9 100644
--- a/crawl-ref/source/tags.cc
+++ b/crawl-ref/source/tags.cc
@@ -374,7 +374,7 @@ void marshallString(struct tagHeader &th, const std::string &data, int maxSize)
 }
 
 // string -- unmarshall length & string data
-void unmarshallCString(struct tagHeader &th, char *data, int maxSize)
+int unmarshallCString(struct tagHeader &th, char *data, int maxSize)
 {
     // get length
     short len = unmarshallShort(th);
@@ -388,6 +388,8 @@ void unmarshallCString(struct tagHeader &th, char *data, int maxSize)
     data[copylen] = 0;
 
     th.offset += len;
+
+    return (copylen);
 }
 
 std::string unmarshallString(tagHeader &th, int maxSize)
@@ -398,10 +400,9 @@ std::string unmarshallString(tagHeader &th, int maxSize)
     if (!buffer)
         return ("");    
     *buffer = 0;
-    unmarshallCString(th, buffer, maxSize);
-    const std::string res = buffer;
+    const int slen = unmarshallCString(th, buffer, maxSize);
+    const std::string res(buffer, slen);
     delete [] buffer;
-
     return (res);
 }
 
diff --git a/crawl-ref/source/tags.h b/crawl-ref/source/tags.h
index ebc61c6d4d..f07ada57ab 100644
--- a/crawl-ref/source/tags.h
+++ b/crawl-ref/source/tags.h
@@ -52,7 +52,7 @@ short unmarshallShort(struct tagHeader &th);
 long unmarshallLong(struct tagHeader &th);
 float unmarshallFloat(struct tagHeader &th);
 bool unmarshallBoolean(struct tagHeader &th);
-void unmarshallCString(struct tagHeader &th, char *data, int maxSize);
+int unmarshallCString(struct tagHeader &th, char *data, int maxSize);
 std::string unmarshallString(tagHeader &th, int maxSize = 1000);
 void unmarshallCoord(tagHeader &th, coord_def &c);
 
diff --git a/crawl-ref/source/util/levcomp.lpp b/crawl-ref/source/util/levcomp.lpp
index 6ec10124ad..e234f90b2d 100644
--- a/crawl-ref/source/util/levcomp.lpp
+++ b/crawl-ref/source/util/levcomp.lpp
@@ -39,14 +39,12 @@ static void clean()
     alloced = false;
 }
 
-static void settext(bool trim_right = false, int strip_trailing = 0)
+static char *copy_text(bool trim_right, int strip_trailing)
 {
-    clean();
     char *newstring = NULL;
     if ((yylval.text = newstring = strdup(yytext)))
     {
         alloced = true;
-
         char *s = NULL;
         if (trim_right)
         {
@@ -62,6 +60,14 @@ static void settext(bool trim_right = false, int strip_trailing = 0)
                 *s-- = 0;
         }
     }
+    return (newstring);
+}
+
+static void settext(bool trim_right = false, int strip_trailing = 0)
+{
+    clean();
+    char *newstring = copy_text(trim_right, strip_trailing);
+    yylval.text = newstring;
 }
 
 %}
@@ -73,6 +79,7 @@ static void settext(bool trim_right = false, int strip_trailing = 0)
 %s MNAME
 %s KEYWORDS
 %x ITEM_LIST
+%x TOEOL
 
 %option yylineno
 %option never-interactive
@@ -152,6 +159,17 @@ NSPACE [^\ \t\r\n]
 
 <ARGUMENT>\r?\n     { BEGIN(INITIAL); }
 
+<TOEOL>.*\\[ \t]*$  {
+                        settext(true, 1);
+                        return STRING;
+                    }
+
+<TOEOL>.+$          {
+                        BEGIN(INITIAL);
+                        settext();
+                        return STRING;
+                    }
+
 ^[ \t]*#.*          ;
 
 ^\s*MAP[ \t]*$      { BEGIN(MAPDEF); }
@@ -178,7 +196,7 @@ SUBST:              { BEGIN(ITEM_LIST); return SUBST; }
 NSUBST:             { BEGIN(ITEM_LIST); return NSUBST; }
 MONS:               { BEGIN(MNAME); return MONS; }
 ITEM:               { BEGIN(ITEM_LIST); return ITEM; }
-MARKER:             { BEGIN(ITEM_LIST); return MARKER; }
+MARKER:             { BEGIN(TOEOL); return MARKER; }
 SHUFFLE:            { BEGIN(ITEM_LIST); return SHUFFLE; }
 
 KFEAT:              { BEGIN(ARGUMENT); return KFEAT; }
diff --git a/crawl-ref/source/util/levcomp.ypp b/crawl-ref/source/util/levcomp.ypp
index 0da88b1ce1..10b74dcc04 100644
--- a/crawl-ref/source/util/levcomp.ypp
+++ b/crawl-ref/source/util/levcomp.ypp
@@ -15,6 +15,8 @@ int yylex();
 
 extern int yylineno;
 
+static bool start_marker_segment = false;
+
 void yyerror(const char *e)
 {
     if (strstr(e, lc_desfile.c_str()) == e)
@@ -280,19 +282,32 @@ tagstring       : STRING
                 }
                 ;
 
-marker          : MARKER marker_specs { }
+marker          : MARKER 
+                {
+                    lc_map.main.add(yylineno, "marker(");
+                    start_marker_segment = true;
+                }
+                  marker_spec
+                {
+                    lc_map.main.add(yylineno, ")");
+                }
                 ;
 
-marker_specs    : marker_spec                       { }
-                | marker_specs COMMA marker_spec    { }
+marker_spec     : mspec_segments
+
+mspec_segments  : /* nothing */
+                | mspec_segments mspec_segment
                 ;
 
-marker_spec     : ITEM_INFO
+mspec_segment   : STRING
                 {
                     lc_map.main.add(
-                        yylineno,
-                        make_stringf("marker(\"%s\")",
+                        yylineno, 
+                        make_stringf(
+                            "%s\"%s\"",
+                            start_marker_segment? "" : " .. ",
                             quote_lua_string($1).c_str()));
+                    start_marker_segment = false;
                 }
                 ;
 
diff --git a/crawl-ref/source/view.cc b/crawl-ref/source/view.cc
index 85e780d42d..67e9274d22 100644
--- a/crawl-ref/source/view.cc
+++ b/crawl-ref/source/view.cc
@@ -232,6 +232,11 @@ void clear_envmap_grid( int x, int y )
     env.map[x][y].clear();
 }
 
+bool is_notable_terrain(dungeon_feature_type ftype)
+{
+    return Feature[ftype].notable;
+}
+
 #if defined(WIN32CONSOLE) || defined(DOS)
 static unsigned colflag2brand(int colflag)
 {
diff --git a/crawl-ref/source/view.h b/crawl-ref/source/view.h
index 19f0cedbd5..a5357ce218 100644
--- a/crawl-ref/source/view.h
+++ b/crawl-ref/source/view.h
@@ -124,6 +124,7 @@ bool is_terrain_known( int x, int y );
 bool is_terrain_seen( int x, int y );
 bool is_terrain_changed( int x, int y );
 bool is_terrain_known(const coord_def &p);
+bool is_notable_terrain(dungeon_feature_type ftype);
 
 inline bool is_terrain_seen(const coord_def &c)
 {