From dd009ccdfd62f9153dbc72f5f5de5d5f72979690 Mon Sep 17 00:00:00 2001
From: David Walter Seikel
Date: Tue, 22 Apr 2014 15:13:38 +1000
Subject: Move all source into the new src directory, and shuffle a few other
 things around.

---
 src/GuiLua/test_c.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 src/GuiLua/test_c.c

(limited to 'src/GuiLua/test_c.c')

diff --git a/src/GuiLua/test_c.c b/src/GuiLua/test_c.c
new file mode 100644
index 0000000..5328bda
--- /dev/null
+++ b/src/GuiLua/test_c.c
@@ -0,0 +1,88 @@
+/* Should be a Lua skang module, roughly the same as test.lua
+
+Seems to be several problems with linking in various OSes, here's some
+possibly helpful links -
+
+http://lua.2524044.n2.nabble.com/C-Lua-modules-not-compatible-with-every-Lua-interpreter-td7647522.html
+http://lua-users.org/wiki/LuaProxyDllFour
+http://stackoverflow.com/questions/11492194/how-do-you-create-a-lua-plugin-that-calls-the-c-lua-api?rq=1
+http://lua-users.org/lists/lua-l/2008-01/msg00671.html
+*/
+
+
+#include "GuiLua.h"
+
+
+static const char *ourName = "test_c";
+int skang, _M;
+
+static int cfunc (lua_State *L)
+{
+  double arg1 = luaL_checknumber(L, 1);
+  const char *arg2 = luaL_checkstring(L, 2);
+
+  printf("Inside %s.cfunc(%f, %s)\n", ourName, arg1, arg2);
+  return 0;
+}
+
+/* local test_c = require 'test_c'
+
+Lua's require() function will strip any stuff from the front of the name
+separated by a hyphen, so 'ClientHamr-GuiLua-test_c' -> 'test_c'.  Then
+it will search through a path, and eventually find this test_c.so (or
+test_c.dll or whatever), then call luaopen_test_c(), which should return
+a table.  The argument (only thing on the stack) for this function will
+be 'test_c'.
+
+Normally luaL_register() creates a table of functions, that is the table
+returned, but we want to do something different with skang.
+*/
+int luaopen_test_c(lua_State *L)
+{
+  // In theory, the only thing on the stack now is 'test_c' from the require() call.
+
+// pseudo-indices, special tables that can be accessed like the stack -
+//    LUA_GLOBALSINDEX - thread environment, where globals are
+//    LUA_ENVIRONINDEX - C function environment, in this case luaopen_test_c() is the C function
+//    LUA_REGISTRYINDEX - C registry, global, for unique keys use the module name as a string, or a lightuserdata address to a C object in our module.
+//    lua_upvalueindex(n) - C function upvalues
+
+// The only locals we care about are skang and _M.
+// All modules go into package.loaded[name] as well.
+// skang is essentially a global anyway.
+// _M we pass back as the result, and our functions get added to it by skang.thingasm()
+//   Not entirely true, _M is a proxy table, getmetatable(_M).__values[cfunc] would be our function.
+
+// local skang = require 'skang'
+  lua_getglobal(L, "require");
+  lua_pushstring(L, SKANG);
+  lua_call(L, 1, 1);
+  lua_setfield(L, LUA_REGISTRYINDEX, SKANG);
+  lua_getfield(L, LUA_REGISTRYINDEX, SKANG);
+  skang = lua_gettop(L);
+
+// local _M = skang.moduleBegin('test_c', nil, 'Copyright 2014 David Seikel', '0.1', '2014-03-27 03:57:00', nil, false)
+  push_lua(L, "@ ( $ ~ $ $ $ ~ ! )", skang, MODULEBEGIN, ourName, "Copyright 2014 David Seikel", "0.1", "2014-03-27 03:57:00", 0, 1);
+  lua_setfield(L, LUA_REGISTRYINDEX, ourName);
+  lua_getfield(L, LUA_REGISTRYINDEX, ourName);
+  _M = lua_gettop(L);
+
+// This uses function{} style.
+// skang.thingasm{_M, 'cfooble,c', 'cfooble help text', 1, widget=\"'edit', 'The cfooble:', 1, 1, 10, 50\", required=true}
+  push_lua(L, "@ ( { = $ $ % $widget !required } )", skang, THINGASM, _M, "cfooble,c", "cfooble help text", 1, "'edit', 'The cfooble:', 1, 1, 10, 50", 1, 0);
+
+// skang.thing(_M, 'cbar', 'Help text', 'Default')
+  push_lua(L, "@ ( = $ $ $ )", skang, THINGASM, _M, "cbar", "Help text", "Default", 0);
+
+// skang.thingasm(_M, 'cfoo')
+  push_lua(L, "@ ( = $ )", skang, THINGASM, _M, "cfoo", 0);
+
+// skang.thingasm(_M, 'cfunc', 'cfunc does nothing really', cfunc, 'number,string')
+ push_lua(L, "@ ( = $ $ & $ )", skang, THINGASM, _M, "cfunc", "cfunc does nothing really", cfunc, "number,string", 0);
+
+// skang.moduleEnd(_M)
+  push_lua(L, "@ ( = )", skang, MODULEEND, _M, 0);
+
+  // Return _M, the table itself, not the index.
+  return 1;
+}
-- 
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