Experimental: try wrapping a dfhack api function.

library/LuaTools.cpp

@@ -35,14 +35,18 @@ distribution.
 // must be last due to MS stupidity
 #include "DataDefs.h"
 #include "DataIdentity.h"
+#include "DataFuncs.h"
 
 #include "modules/World.h"
+#include "modules/Gui.h"
 
 #include "LuaWrapper.h"
 #include "LuaTools.h"
 
 #include "MiscUtils.h"
 
+#include "df/job.h"
+
 #include <lua.h>
 #include <lauxlib.h>
 #include <lualib.h>
@@ -868,6 +872,8 @@ lua_State *DFHack::Lua::Open(color_ostream &out, lua_State *state)
 
     OpenPersistent(state);
 
+    LuaWrapper::AddMethodWrapper(state, 0, -1, "getSelectedJob", df::wrap_function(&Gui::getSelectedJob));
+
     lua_setglobal(state, "dfhack");
 
     // load dfhack.lua

library/LuaTypes.cpp

@@ -1029,11 +1029,16 @@ static int meta_call_function(lua_State *state)
 /**
  * Create a closure invoking the given function, and add it to the field table.
  */
-static void AddMethodWrapper(lua_State *state, int meta_idx, int field_idx,
+void LuaWrapper::AddMethodWrapper(lua_State *state, int meta_idx, int field_idx,
                                   const char *name, function_identity_base *fun)
 {
+    field_idx = lua_absindex(state, field_idx);
+
     lua_rawgetp(state, LUA_REGISTRYINDEX, &DFHACK_TYPETABLE_TOKEN);
+    if (meta_idx)
         lua_pushvalue(state, meta_idx);
+    else
+        lua_pushlightuserdata(state, NULL); // can't be a metatable
     lua_pushfstring(state, "%s()", name);
     lua_pushlightuserdata(state, fun);
     lua_pushcclosure(state, meta_call_function, 4);

library/LuaWrapper.cpp

@@ -53,6 +53,9 @@ static luaL_Reg no_functions[] = { { NULL, NULL } };
  */
 void LuaWrapper::field_error(lua_State *state, int index, const char *err, const char *mode)
 {
+    if (lua_islightuserdata(state, UPVAL_METATABLE))
+        lua_pushstring(state, "(global)");
+    else
         lua_getfield(state, UPVAL_METATABLE, "__metatable");
     const char *cname = lua_tostring(state, -1);
     const char *fname = index ? lua_tostring(state, index) : "*";

library/include/DataFuncs.h

@@ -67,10 +67,15 @@ namespace df {
     CT *self = (CT*)DFHack::LuaWrapper::get_object_addr(state, base++, UPVAL_METHOD_NAME, "invoke");
 #define LOAD_ARG(type) \
     type v##type; df::identity_traits<type>::get()->lua_write(state, UPVAL_METHOD_NAME, &v##type, base++);
+#define OSTREAM_ARG DFHack::color_ostream&
+#define LOAD_OSTREAM(name) \
+    DFHack::color_ostream_proxy name(DFHack::Core::getInstance().getConsole());
 
-#define INSTANTIATE_WRAPPERS(Count, FArgs, Args, Loads) \
+#define INSTANTIATE_RETURN_TYPE(FArgs) \
     template<FW_TARGSC class RT> struct return_type<RT (*) FArgs> { typedef RT type; }; \
-    template<FW_TARGSC class RT, class CT> struct return_type<RT (CT::*) FArgs> { typedef RT type; }; \
+    template<FW_TARGSC class RT, class CT> struct return_type<RT (CT::*) FArgs> { typedef RT type; };
+
+#define INSTANTIATE_WRAPPERS(Count, FArgs, Args, Loads) \
     template<FW_TARGS> struct function_wrapper<void (*) FArgs, true> { \
         static const bool is_method = false; \
         static const int num_args = Count; \
@@ -96,24 +101,35 @@ namespace df {
 
 #define FW_TARGSC
 #define FW_TARGS
+INSTANTIATE_RETURN_TYPE(())
 INSTANTIATE_WRAPPERS(0, (), (), ;)
+INSTANTIATE_WRAPPERS(0, (OSTREAM_ARG), (out), LOAD_OSTREAM(out);)
 #undef FW_TARGS
 
 #undef FW_TARGSC
 #define FW_TARGSC FW_TARGS,
 #define FW_TARGS class A1
+INSTANTIATE_RETURN_TYPE((A1))
 INSTANTIATE_WRAPPERS(1, (A1), (vA1), LOAD_ARG(A1);)
+INSTANTIATE_WRAPPERS(1, (OSTREAM_ARG,A1), (out,vA1), LOAD_OSTREAM(out); LOAD_ARG(A1);)
 #undef FW_TARGS
 
 #define FW_TARGS class A1, class A2
+INSTANTIATE_RETURN_TYPE((A1,A2))
 INSTANTIATE_WRAPPERS(2, (A1,A2), (vA1,vA2), LOAD_ARG(A1); LOAD_ARG(A2);)
+INSTANTIATE_WRAPPERS(2, (OSTREAM_ARG,A1,A2), (out,vA1,vA2),
+                     LOAD_OSTREAM(out); LOAD_ARG(A1); LOAD_ARG(A2);)
 #undef FW_TARGS
 
 #define FW_TARGS class A1, class A2, class A3
+INSTANTIATE_RETURN_TYPE((A1,A2,A3))
 INSTANTIATE_WRAPPERS(3, (A1,A2,A3), (vA1,vA2,vA3), LOAD_ARG(A1); LOAD_ARG(A2); LOAD_ARG(A3);)
+INSTANTIATE_WRAPPERS(3, (OSTREAM_ARG,A1,A2,A3), (out,vA1,vA2,vA3),
+                     LOAD_OSTREAM(out); LOAD_ARG(A1); LOAD_ARG(A2); LOAD_ARG(A3);)
 #undef FW_TARGS
 
 #define FW_TARGS class A1, class A2, class A3, class A4
+INSTANTIATE_RETURN_TYPE((A1,A2,A3,A4))
 INSTANTIATE_WRAPPERS(4, (A1,A2,A3,A4), (vA1,vA2,vA3,vA4),
                      LOAD_ARG(A1); LOAD_ARG(A2); LOAD_ARG(A3); LOAD_ARG(A4);)
 #undef FW_TARGS
@@ -124,6 +140,8 @@ INSTANTIATE_WRAPPERS(4, (A1,A2,A3,A4), (vA1,vA2,vA3,vA4),
 #undef INVOKE_RV
 #undef LOAD_CLASS
 #undef LOAD_ARG
+#undef OSTREAM_ARG
+#undef LOAD_OSTREAM
 
     template<class T>
     class function_identity : public function_identity_base {

library/include/LuaWrapper.h

@@ -220,6 +220,11 @@ namespace DFHack { namespace LuaWrapper {
      * and the enum itself to the _enum metafield. Pushes the key table on the stack.
      */
     void AttachEnumKeys(lua_State *state, int meta_idx, int ftable_idx, type_identity *ienum);
+    /**
+     * Create a closure invoking the given function, and add it to the field table.
+     */
+    void AddMethodWrapper(lua_State *state, int meta_idx, int field_idx,
+                          const char *name, function_identity_base *fun);
 
     void IndexStatics(lua_State *state, int meta_idx, int ftable_idx, struct_identity *pstruct);