Add argcargv.i to Lua
Found in https://stackoverflow.com/questions/9860362/swig-lua-call-mint-argv-char-argc
diff --git a/Lib/lua/argcargv.i b/Lib/lua/argcargv.i
new file mode 100644
index 0000000..670ce4a
--- /dev/null
+++ b/Lib/lua/argcargv.i
@@ -0,0 +1,58 @@
+/* ------------------------------------------------------------
+ * --- Argc & Argv ---
+ * ------------------------------------------------------------
+ *
+ * Use it as follow:
+ *
+ * %apply (int ARGC, char **ARGV) { (size_t argc, const char **argv) }
+ * extern int mainApp(size_t argc, const char **argv);
+ *
+ * then in the lua:
+ *
+ * args = { "arg0", "arg1" }
+ * mainApp(args);
+ *
+ * ------------------------------------------------------------ */
+
+%{
+SWIGINTERN int SWIG_argv_size(lua_State* L, int index) {
+ int n=0;
+ while(1){
+ lua_rawgeti(L,index,n+1);
+ if (lua_isnil(L,-1))
+ break;
+ ++n;
+ lua_pop(L,1);
+ }
+ lua_pop(L,1);
+ return n;
+}
+%}
+
+%typemap(in) (int ARGC, char **ARGV) {
+ if (lua_istable(L,$input)) {
+ int i, size = SWIG_argv_size(L,$input);
+ $1 = ($1_ltype) size;
+ $2 = (char **) malloc((size+1)*sizeof(char *));
+ for (i = 0; i < size; i++) {
+ lua_rawgeti(L,$input,i+1);
+ if (lua_isnil(L,-1))
+ break;
+ $2[i] = (char *)lua_tostring(L, -1);
+ lua_pop(L,1);
+ }
+ $2[i]=NULL;
+ } else {
+ $1 = 0; $2 = 0;
+ lua_pushstring(L,"Expecting argv array");
+ lua_error(L);
+ }
+}
+
+%typemap(typecheck, precedence=SWIG_TYPECHECK_STRING_ARRAY) (int ARGC, char **ARGV) {
+ $1 = lua_istable(L,$input);
+}
+
+%typemap(freearg) (int ARGC, char **ARGV) {
+ free((char *) $2);
+}
