making tostring() work

src/common/kernel/region.c

@@ -1353,7 +1353,7 @@ region_setinfo(struct region * r, const char * info)
 
 const char *
 region_getinfo(const region * r) {
-  return (const char *)r->display;
+  return r->display?r->display:"";
 }
 
 void
@@ -1367,6 +1367,8 @@ region_setname(struct region * r, const char * name)
 
 const char *
 region_getname(const region * r) {
-  if (r->land) return (const char *)r->land->name;
-  return NULL;
+  if (r->land && r->land->name) {
+    return r->land->name;
+  }
+  return "";
 }

src/eressea/lua/region.cpp

@@ -316,6 +316,7 @@ plane_getbyname(const char * str)
   return 0;
 }
 
+
 void
 bind_region(lua_State * L)
 {

src/eressea/tolua/bind_building.c

@@ -119,6 +119,13 @@ tolua_building_create(lua_State* tolua_S)
   return 1;
 }
 
+static int
+tolua_building_tostring(lua_State *tolua_S)
+{
+  building * self = (building *)tolua_tousertype(tolua_S, 1, 0);
+  lua_pushstring(tolua_S, buildingname(self));
+  return 1;
+}
 
 void
 tolua_building_open(lua_State* tolua_S)
@@ -133,6 +140,8 @@ tolua_building_open(lua_State* tolua_S)
     tolua_cclass(tolua_S, "building", "building", "", NULL);
     tolua_beginmodule(tolua_S, "building");
     {
+      tolua_function(tolua_S, "__tostring", tolua_building_tostring);
+
       tolua_variable(tolua_S, "id", tolua_building_get_id, NULL);
       tolua_variable(tolua_S, "name", tolua_building_get_name, tolua_building_set_name);
       tolua_variable(tolua_S, "units", tolua_building_get_units, NULL);

src/eressea/tolua/bind_faction.c

@@ -374,6 +374,13 @@ static int tolua_faction_get_items(lua_State* tolua_S)
   return 1;
 }
 
+static int
+tolua_faction_tostring(lua_State *tolua_S)
+{
+  faction * self = (faction *)tolua_tousertype(tolua_S, 1, 0);
+  lua_pushstring(tolua_S, factionname(self));
+  return 1;
+}
 
 void
 tolua_faction_open(lua_State* tolua_S)
@@ -388,6 +395,8 @@ tolua_faction_open(lua_State* tolua_S)
     tolua_cclass(tolua_S, "faction", "faction", "", NULL);
     tolua_beginmodule(tolua_S, "faction");
     {
+      tolua_function(tolua_S, "__tostring", tolua_faction_tostring);
+
       tolua_variable(tolua_S, "name", tolua_faction_get_name, tolua_faction_set_name);
       tolua_variable(tolua_S, "info", tolua_faction_get_info, tolua_faction_set_info);
       tolua_variable(tolua_S, "units", tolua_faction_get_units, NULL);

src/eressea/tolua/bind_region.c

@@ -288,6 +288,14 @@ tolua_region_setkey(lua_State* tolua_S)
   return 0;
 }
 
+static int
+tolua_region_tostring(lua_State *tolua_S)
+{
+  region * self = (region *)tolua_tousertype(tolua_S, 1, 0);
+  lua_pushstring(tolua_S, regionname(self, NULL));
+  return 1;
+}
+
 void
 tolua_region_open(lua_State* tolua_S)
 {
@@ -301,6 +309,7 @@ tolua_region_open(lua_State* tolua_S)
     tolua_beginmodule(tolua_S, "region");
     {
       tolua_function(tolua_S, "create", tolua_region_create);
+      tolua_function(tolua_S, "__tostring", tolua_region_tostring);
 
       tolua_variable(tolua_S, "id", tolua_region_get_id, NULL);
       tolua_variable(tolua_S, "x", tolua_region_get_x, NULL);

src/eressea/tolua/bind_ship.c

@@ -95,6 +95,14 @@ tolua_ship_create(lua_State* tolua_S)
   return 1;
 }
 
+static int
+tolua_ship_tostring(lua_State *tolua_S)
+{
+  ship * self = (ship *)tolua_tousertype(tolua_S, 1, 0);
+  lua_pushstring(tolua_S, shipname(self));
+  return 1;
+}
+
 void
 tolua_ship_open(lua_State* tolua_S)
 {
@@ -107,6 +115,7 @@ tolua_ship_open(lua_State* tolua_S)
     tolua_cclass(tolua_S, "ship", "ship", "", NULL);
     tolua_beginmodule(tolua_S, "ship");
     {
+      tolua_function(tolua_S, "__tostring", tolua_ship_tostring);
       tolua_variable(tolua_S, "id", tolua_ship_get_id, NULL);
       tolua_variable(tolua_S, "name", tolua_ship_get_name, tolua_ship_set_name);
       tolua_variable(tolua_S, "units", tolua_ship_get_units, NULL);

src/eressea/tolua/bind_unit.c

@@ -832,6 +832,14 @@ tolua_unit_create(lua_State* tolua_S)
   return 1;
 }
 
+static int
+tolua_unit_tostring(lua_State *tolua_S)
+{
+  unit * self = (unit *)tolua_tousertype(tolua_S, 1, 0);
+  lua_pushstring(tolua_S, unitname(self));
+  return 1;
+}
+
 void
 tolua_unit_open(lua_State * tolua_S)
 {
@@ -845,6 +853,7 @@ tolua_unit_open(lua_State * tolua_S)
     tolua_cclass(tolua_S, "unit", "unit", "", NULL);
     tolua_beginmodule(tolua_S, "unit");
     {
+      tolua_function(tolua_S, "__tostring", tolua_unit_tostring);
       tolua_function(tolua_S, "create", tolua_unit_create);
 
       tolua_variable(tolua_S, "name", tolua_unit_get_name, tolua_unit_set_name);

src/scripts/tests.lua

@@ -108,6 +108,13 @@ local function test_region()
     assert(r:get_resource("horse") == 42)
     assert(r:get_resource("money") == 45)
     assert(r:get_resource("peasant") == 200)
+    r.name = nil
+    r.info = nil
+    assert(r.name=="")
+    assert(r.info=="")
+    r.name = "Alabasterheim"
+    r.info = "Hier wohnen die siebzehn Zwerge"
+    assert(tostring(r) == "Alabasterheim (0,0)")
 end
 
 local function test_building()