add map_id condition for EoC

doc/EFFECT_ON_CONDITION.md

@@ -1031,6 +1031,37 @@ Check the north terrain or furniture has `TRANSPARENT` flag.
 },
 ```
 
+### `map_terrain_id`, `map_furniture_id`
+- type: string or [variable object](##variable-object)
+- return true if the terrain or furniture has specific id
+- `loc` will specify location of terrain or furniture (**mandatory**)
+
+#### Valid talkers:
+
+No talker is needed.
+
+#### Examples
+Runs a query, allowing you to pick specific tile around. When picked, stores coordinates of this tile in `check_terrain` variable, and then check is it a `t_grass`. If yes, `effect` is run, otherwise `false_effect` is run
+```json
+{
+  "type": "effect_on_condition",
+  "id": "EOC_TEST_QUERY",
+  "condition": {
+    "and": [
+      {
+        "u_query_tile": "line_of_sight",
+        "target_var": { "context_val": "check_terrain" },
+        "message": "Check what terrain it is",
+        "range": 10
+      },
+      { "map_terrain_id": "t_grass", "loc": { "context_val": "check_terrain" } }
+    ]
+  },
+  "effect": [ { "u_message": "it is a grass" } ],
+  "false_effect": [ { "u_message": "it is NOT a grass" } ]
+}
+```
+
 ### `map_in_city`
 - type: location string or [variable object](##variable-object)
 - return true if the location is in a city

src/condition.cpp

@@ -1589,6 +1589,26 @@
     };
 }
 
+conditional_t::func f_map_ter_furn_id( const JsonObject &jo, std::string_view member )
+{
+    str_or_var furn_type = get_str_or_var( jo.get_member( member ), member, true );
+    var_info loc_var = read_var_info( jo.get_object( "loc" ) );
+    bool terrain = true;
+    if( member == "map_terrain_id" ) {
+        terrain = true;
+    } else if( member == "map_furniture_id" ) {
+        terrain = false;
+    }
+    return [terrain, furn_type, loc_var]( dialogue const & d ) {
+        tripoint loc = get_map().getlocal( get_tripoint_from_var( loc_var, d ) );
+        if( terrain ) {
+            return get_map().ter( loc ) == ter_id( furn_type.evaluate( d ) );
+        } else {
+            return get_map().ter( loc ) == ter_id( furn_type.evaluate( d ) );
+        }
+    };
+}
+
 conditional_t::func f_map_in_city( const JsonObject &jo, std::string_view member )
 {
     str_or_var target = get_str_or_var( jo.get_member( member ), member, true );
@@ -2400,6 +2420,8 @@
     {"is_weather", jarg::member, &conditional_fun::f_is_weather },
     {"map_terrain_with_flag", jarg::member, &conditional_fun::f_map_ter_furn_with_flag },
     {"map_furniture_with_flag", jarg::member, &conditional_fun::f_map_ter_furn_with_flag },
+    {"map_terrain_id", jarg::member, &conditional_fun::f_map_ter_furn_id },
+    {"map_furniture_id", jarg::member, &conditional_fun::f_map_ter_furn_id },
     {"map_in_city", jarg::member, &conditional_fun::f_map_in_city },
     {"mod_is_loaded", jarg::member, &conditional_fun::f_mod_is_loaded },
     {"u_has_faction_trust", jarg::member | jarg::array, &conditional_fun::f_has_faction_trust },