Do a refactor of command parsing in lpxclient and lpxserver

luprex/cpp/core/luaconsole.hpp

@@ -59,8 +59,6 @@ private:
     StringVec words_;
 
     void clear_raw_input();
-    void simplify(const StringVec &words);
-    void synerr(const eng::string &msg);
 
 public:
     LuaConsole();
@@ -74,16 +72,49 @@ public:
     
     // Get the command words.
     //
-    // Note that the command words may not be exactly what
-    // the user typed.  Typically, the LuaConsole simplifies
-    // the command before returning it to the caller.
-    //
     StringVec get_command();
     
     // Add a line of text that was just read from the console.
     //
     void add(eng::string line);
+};
 
+//////////////////////////////////////////////////////
+//
+// CommonCommands is parses slash-commands that are understood by
+// lpxclient and lpxserver.  That way, these two separate
+// sourcefiles don't have to duplicate the code for parsing.
+//
+// After parsing, this module calls a virtual function
+// to execute the command.  lpxserver and lpxclient
+// implement these virtual functions in different ways.
+//
+//////////////////////////////////////////////////////
+
+class CommonCommands {
+public:
+    using StringVec = eng::vector<eng::string>;
+
+protected:
+    virtual void do_syntax_error(std::string_view error) = 0;
+    virtual void do_unknown_command(std::string_view name) = 0;
+    virtual void do_choose_command(int64_t n) = 0;
+    virtual void do_view_command() = 0;
+    virtual void do_moveto_command(int x, int y) = 0;
+    virtual void do_menu_command(int64_t tanid) = 0;
+    virtual void do_quit_command() = 0;
+    virtual void do_cpl_command() = 0;
+    virtual void do_work_command() = 0;
+    virtual void do_display_command() = 0;
+    virtual void do_aborthttp_command() = 0;
+    virtual void do_connect_command(std::string_view hostname) = 0;
+    virtual void do_luainvoke_command(std::string_view cmd) = 0;
+    virtual void do_luaprobe_command(std::string_view cmd) = 0;
+
+public:
+    // Parse a command and call one of the virtual command functions above.
+    //
+    void do_command(const StringVec &command);
 };
 
 #endif // LUACONSOLE_HPP