LUA Command Window
Author
Currently I'm using an in-game console to debug and change my engine's global settings and to load models during run-time. In addition, I would really like to create an external LUA command window that runs in debug mode. This way I can load additional scripts, view globals, view debug info, and call functions directly.
I guess a simple example would be to have a print() statement in one of my LUA scripts and view it in the command window. Is this possible? I can't seem to find any information on the subject, so I would greatly appreciate some direction. What I don't want to do is bind my console to LUA, but maybe this is the only way...
redirecting lua's output to somthing other than std out can be tricky. What I ended up doing was redefining the print() function to redirect it to a c++ stream and then set the stream to one of my own streams that goes to log files/console/std out.
Here's the function I used to do that:
This is almost exactly what Lua's print() function actually does (taken from their source) but instead of using fprint(), I used my custom c++ stream. You can use whatever meets your needs.
To replace the function, I simply set this as the global "print" function.
Cheers,
Bob
Here's the function I used to do that:
int LuaState::myPrint(lua_State *L){ assert(theOutputStream!=NULL); int n = lua_gettop(L); /* number of arguments */ int i; lua_getglobal(L, "tostring"); for (i=1; i<=n; i++) { const char *s; lua_pushvalue(L, -1); /* function to be called */ lua_pushvalue(L, i); /* value to print */ lua_call(L, 1, 1); s = lua_tostring(L, -1); /* get result */ if (s == NULL) { return luaL_error(L, LUA_QL("tostring") " must return a string to " LUA_QL("print")); } if (i>1) { *theOutputStream << '\t'; } *theOutputStream << s; lua_pop(L, 1); /* pop result */ } *theOutputStream << std::endl; return 0;}This is almost exactly what Lua's print() function actually does (taken from their source) but instead of using fprint(), I used my custom c++ stream. You can use whatever meets your needs.
To replace the function, I simply set this as the global "print" function.
//register the new print() debug << "changing lua print function" << endl; theOutputStream=&warn lua_pushcfunction(myState, LuaState::myPrint); lua_setglobal(myState, "print");Cheers,
Bob
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