More refactors to prepare for doc-search, including moving unicode support into ext.

luprex/cpp/core/source.cpp

@@ -545,6 +545,24 @@ void SourceDB::register_lua_builtins() {
     lua_close(L);
 }
 
+
+
+util::StringVec SourceDB::search_docs(const eng::string &substring) {
+    // This map will hold the results.  It maps function name
+    // to a documentation line.
+    eng::map<eng::string, eng::string> results;
+
+    // Search the built-in functions.
+    // for (const LuaFunctionReg *reg = LuaFunctionReg::All; reg != nullptr; reg=reg->next()) {
+    // }
+
+    util::StringVec resultvec;
+    for (const auto &pair : results) {
+        resultvec.push_back(pair.second);
+    }
+    return resultvec;
+}
+
 eng::string SourceDB::function_docs(const LuaCoreStack &LS, LuaSlot fn) {
     lua_State *L = LS.state();
     if (LS.iscfunction(fn)) {