Added plugin loading/unloading/reloading. Many locks. Too many damn locks.

library/Console-linux.cpp

@@ -209,6 +209,7 @@ namespace DFHack
             else
             {
                 print("\033c\033[3J\033[H");
+                fflush(dfout_C);
             }
         }
         /// Position cursor at x,y. 1,1 = top left corner

library/Core.cpp

@@ -43,6 +43,7 @@ using namespace std;
 #include "dfhack/PluginManager.h"
 #include "ModuleFactory.h"
 #include "dfhack/modules/Gui.h"
+#include "dfhack/modules/World.h"
 
 #include "dfhack/SDL_fakes/events.h"
 
@@ -130,46 +131,189 @@ int fIOthread(void * iodata)
         return 0;
     }
     con.print("DFHack is ready. Have a nice day! Type in '?' or 'help' for help.\n");
-    //dfterm <<  << endl;
     int clueless_counter = 0;
     while (true)
     {
         string command = "";
-        con.lineedit("[DFHack]# ",command);
-        con.history_add(command);
-        //con <<"[DFHack]# ";
-        //char * line = linenoise("[DFHack]# ", core->con.dfout_C);
-        //        dfout <<"[DFHack]# ";
-        /*
-        if (line)
+        int ret = con.lineedit("[DFHack]# ",command);
+        if(ret == -2)
         {
-            command=line;
-            linenoiseHistoryAdd(line);
-            free(line);
-        }*/
-        //getline(cin, command);
-        if(command=="help" || command == "?")
+            cerr << "Console is shutting down properly." << endl;
+            return 0;
+        }
+        else if(ret == -1)
+        {
+            cerr << "Console caught an unspecified error." << endl;
+            continue;
+        }
+        else if(ret)
+        {
+            // a proper, non-empty command was entered
+            con.history_add(command);
+        }
+        // cut the input into parts
+        vector <string> parts;
+        cheap_tokenise(command,parts);
+        if(parts.size() == 0)
+        {
+            clueless_counter ++;
+            continue;
+        }
+        string first = parts[0];
+        parts.erase(parts.begin());
+        // let's see what we actually got
+        if(first=="help" || first == "?")
+        {
+            if(!parts.size())
+            {
+                con.print("This is the DFHack console. You can type commands in and manage DFHack plugins from it.\n"
+                          "Some basic editing capabilities are included (single-line text editing).\n"
+                          "The console also has a command history - you can navigate it with Up and Down keys.\n"
+                          "On Windows, you may have to resize your console window. The appropriate menu is accessible\n"
+                          "by clicking on the program icon in the top bar of the window.\n\n"
+                          "Available basic commands:\n"
+                          "  help|? [plugin]       - This text or help specific to a plugin.\n"
+                          "  load plugin|all       - Load a plugin by name or load all possible plugins.\n"
+                          "  unload plugin|all     - Unload a plugin or all loaded plugins.\n"
+                          "  reload plugin|all     - Reload a plugin or all loaded plugins.\n"
+                          "  listp                 - List plugins with their status.\n"
+                          "  listc [plugin]        - List commands. Optionally of a single plugin.\n"
+                          "  lista                 - List all commands, sorted by plugin (verbose).\n"
+                          "  fpause                - Force DF to pause without syncing.\n"
+                          "  die                   - Force DF to close immediately\n"
+                          "  cls                   - Clear the console scrollback.\n"
+                         );
+            }
+            else
+            {
+                con.printerr("not implemented yet\n");
+            }
+        }
+        else if( first == "load" )
+        {
+            if(parts.size())
+            {
+                string & plugname = parts[0];
+                if(plugname == "all")
+                {
+                    for(int i = 0; i < plug_mgr->size();i++)
+                    {
+                        Plugin * plug = (plug_mgr->operator[](i));
+                        plug->load();
+                    }
+                }
+                else
+                {
+                    Plugin * plug = plug_mgr->getPluginByName(plugname);
+                    if(!plug) con.printerr("No such plugin\n");
+                    plug->load();
+                }
+            }
+        }
+        else if( first == "reload" )
+        {
+            if(parts.size())
+            {
+                string & plugname = parts[0];
+                if(plugname == "all")
+                {
+                    for(int i = 0; i < plug_mgr->size();i++)
+                    {
+                        Plugin * plug = (plug_mgr->operator[](i));
+                        plug->reload();
+                    }
+                }
+                else
+                {
+                    Plugin * plug = plug_mgr->getPluginByName(plugname);
+                    if(!plug) con.printerr("No such plugin\n");
+                    plug->reload();
+                }
+            }
+        }
+        else if( first == "unload" )
+        {
+            if(parts.size())
+            {
+                string & plugname = parts[0];
+                if(plugname == "all")
+                {
+                    for(int i = 0; i < plug_mgr->size();i++)
+                    {
+                        Plugin * plug = (plug_mgr->operator[](i));
+                        plug->unload();
+                    }
+                }
+                else
+                {
+                    Plugin * plug = plug_mgr->getPluginByName(plugname);
+                    if(!plug) con.printerr("No such plugin\n");
+                    plug->unload();
+                }
+            }
+        }
+        else if(first == "listp")
+        {
+            for(int i = 0; i < plug_mgr->size();i++)
+            {
+                const Plugin * plug = (plug_mgr->operator[](i));
+                con.print("%s\n", plug->getName().c_str());
+            }
+        }
+        else if(first == "listc")
+        {
+            if(parts.size())
+            {
+                string & plugname = parts[0];
+                const Plugin * plug = plug_mgr->getPluginByName(plugname);
+                if(!plug)
+                {
+                    con.printerr("There's no plugin called %s!\n",plugname.c_str());
+                }
+                else for (int j = 0; j < plug->size();j++)
+                {
+                    const PluginCommand & pcmd = (plug->operator[](j));
+                    con.print("%12s| %s\n",pcmd.name.c_str(), pcmd.description.c_str());
+                }
+            }
+            else for(int i = 0; i < plug_mgr->size();i++)
+            {
+                const Plugin * plug = (plug_mgr->operator[](i));
+                if(!plug->size())
+                    continue;
+                for (int j = 0; j < plug->size();j++)
+                {
+                    const PluginCommand & pcmd = (plug->operator[](j));
+                    con.print("%12s| %s\n",pcmd.name.c_str(), pcmd.description.c_str());
+                }
+            }
+        }
+        else if(first == "lista")
         {
-            con.print("Available commands\n");
-            con.print("------------------\n");
             for(int i = 0; i < plug_mgr->size();i++)
             {
                 const Plugin * plug = (plug_mgr->operator[](i));
                 if(!plug->size())
                     continue;
-                con.print("Plugin %s :\n", plug->getName().c_str());
+                con.print("%s :\n", plug->getName().c_str());
                 for (int j = 0; j < plug->size();j++)
                 {
                     const PluginCommand & pcmd = (plug->operator[](j));
                     con.print("%12s| %s\n",pcmd.name.c_str(), pcmd.description.c_str());
                     //con << setw(12) << pcmd.name << "| " << pcmd.description << endl;
                 }
-                con.print("\n");
+                //con.print("\n");
             }
         }
-        else if( command == "" )
+        else if(first == "fpause")
+        {
+            World * w = core->getWorld();
+            w->SetPauseState(true);
+            con.print("The game was forced to pause!");
+        }
+        else if(first == "cls")
         {
-            clueless_counter++;
+            con.clear();
         }
         else
         {
@@ -189,10 +333,12 @@ int fIOthread(void * iodata)
                     con.printerr("Invalid command.\n");
                     clueless_counter ++;
                 }
+                /*
                 else if(res == CR_FAILURE)
                 {
                     con.printerr("ERROR!\n");
                 }
+                */
             }
         }
         if(clueless_counter == 3)
@@ -393,6 +539,7 @@ int Core::SDL_Event(SDL::Event* ev, int orig_return)
             if(g->hotkeys && g->df_interface && g->df_menu_state)
             {
                 t_viewscreen * ws = g->GetCurrentScreen();
+                // FIXME: put hardcoded values into memory.xml
                 if(ws->getClassName() == "viewscreen_dwarfmodest" && *g->df_menu_state == 0x23)
                     return orig_return;
                 else

library/PluginManager.cpp

@@ -67,71 +67,241 @@ bool hasEnding (std::string const &fullString, std::string const &ending)
         return false;
     }
 }
-
-Plugin::Plugin(Core * core, const std::string & file)
+struct Plugin::RefLock
+{
+    RefLock()
+    {
+        refcount = 0;
+        wakeup = SDL_CreateCond();
+        mut = SDL_CreateMutex();
+    }
+    ~RefLock()
+    {
+        SDL_DestroyCond(wakeup);
+        SDL_DestroyMutex(mut);
+    }
+    void lock()
+    {
+        SDL_mutexP(mut);
+    }
+    void unlock()
+    {
+        SDL_mutexV(mut);
+    }
+    void lock_add()
+    {
+        SDL_mutexP(mut);
+        refcount ++;
+        SDL_mutexV(mut);
+    }
+    void lock_sub()
+    {
+        SDL_mutexP(mut);
+        refcount --;
+        SDL_CondSignal(wakeup);
+        SDL_mutexV(mut);
+    }
+    void operator++()
+    {
+        refcount ++;
+    }
+    void operator--()
+    {
+        refcount --;
+        SDL_CondSignal(wakeup);
+    }
+    void wait()
+    {
+        while(refcount)
+        {
+            SDL_CondWait(wakeup, mut);
+        }
+    }
+    SDL::Cond * wakeup;
+    SDL::Mutex * mut;
+    int refcount;
+};
+Plugin::Plugin(Core * core, const std::string & filepath, const std::string & _filename, PluginManager * pm)
 {
-    filename = file;
+    filename = filepath;
+    parent = pm;
+    name.reserve(_filename.size());
+    for(int i = 0; i < _filename.size();i++)
+    {
+        char ch = _filename[i];
+        if(ch == '.')
+            break;
+        name.append(1,ch);
+    }
     Console & con = core->con;
     plugin_lib = 0;
     plugin_init = 0;
     plugin_shutdown = 0;
     plugin_status = 0;
     plugin_onupdate = 0;
-    loaded = false;
-    DFLibrary * plug = OpenPlugin(file.c_str());
+    state = PS_UNLOADED;
+    access = new RefLock();
+}
+
+Plugin::~Plugin()
+{
+    if(state == PS_LOADED)
+    {
+        unload();
+    }
+    delete access;
+}
+
+bool Plugin::load()
+{
+    access->lock();
+    if(state == PS_BROKEN)
+    {
+        access->unlock();
+        return false;
+    }
+    else if(state == PS_LOADED)
+    {
+        access->unlock();
+        return true;
+    }
+    Core & c = Core::getInstance();
+    Console & con = c.con;
+    DFLibrary * plug = OpenPlugin(filename.c_str());
     if(!plug)
     {
-        con.print("Can't load plugin %s\n", filename.c_str());
-        return;
+        con.printerr("Can't load plugin %s\n", filename.c_str());
+        state = PS_BROKEN;
+        access->unlock();
+        return false;
     }
     const char * (*_PlugName)() =(const char * (*)()) LookupPlugin(plug, "plugin_name");
     if(!_PlugName)
     {
-        con.print("Plugin %s has no name.\n", filename.c_str());
+        con.printerr("Plugin %s has no name.\n", filename.c_str());
         ClosePlugin(plug);
-        return;
+        state = PS_BROKEN;
+        access->unlock();
+        return false;
     }
     plugin_init = (command_result (*)(Core *, std::vector <PluginCommand> &)) LookupPlugin(plug, "plugin_init");
     if(!plugin_init)
     {
-        con.print("Plugin %s has no init function.\n", filename.c_str());
+        con.printerr("Plugin %s has no init function.\n", filename.c_str());
         ClosePlugin(plug);
-        return;
+        state = PS_BROKEN;
+        access->unlock();
+        return false;
     }
     plugin_status = (command_result (*)(Core *, std::string &)) LookupPlugin(plug, "plugin_status");
     plugin_onupdate = (command_result (*)(Core *)) LookupPlugin(plug, "plugin_onupdate");
     plugin_shutdown = (command_result (*)(Core *)) LookupPlugin(plug, "plugin_shutdown");
     name = _PlugName();
     plugin_lib = plug;
-    loaded = true;
-    //dfout << "Found plugin " << name << endl;
-    if(plugin_init(core,commands) == CR_OK)
+    if(plugin_init(&c,commands) == CR_OK)
+    {
+        state = PS_LOADED;
+        parent->registerCommands(this);
+        access->unlock();
+        return true;
+    }
+    else
     {
-        /*
-        for(int i = 0; i < commands.size();i++)
+        con.printerr("Plugin %s has failed to initialize properly.\n", filename.c_str());
+        ClosePlugin(plugin_lib);
+        state = PS_BROKEN;
+        access->unlock();
+        return false;
+    }
+    // not reachable
+}
+
+bool Plugin::unload()
+{
+    Core & c = Core::getInstance();
+    Console & con = c.con;
+    // get the mutex
+    access->lock();
+    // if we are actually loaded
+    if(state == PS_LOADED)
+    {
+        // notify plugin about shutdown
+        command_result cr = plugin_shutdown(&Core::getInstance());
+        // wait for all calls to finish
+        access->wait();
+        // cleanup...
+        parent->unregisterCommands(this);
+        if(cr == CR_OK)
+        {
+            ClosePlugin(plugin_lib);
+            state = PS_UNLOADED;
+            access->unlock();
+            return false;
+        }
+        else
         {
-            dfout << commands[i].name << " : " << commands[i].description << std::endl;
+            con.printerr("Plugin %s has failed to shutdown!\n",name.c_str());
+            state = PS_BROKEN;
+            access->unlock();
+            return false;
         }
-        */
     }
-    else
+    else if(state == PS_UNLOADED)
     {
-        // horrible!
+        access->unlock();
+        return true;
     }
+    access->unlock();
+    return false;
 }
 
-Plugin::~Plugin()
+bool Plugin::reload()
+{
+    if(state != PS_LOADED)
+        return false;
+    if(!unload())
+        return false;
+    if(!load())
+        return false;
+    return true;
+}
+
+command_result Plugin::invoke( std::string & command, std::vector <std::string> & parameters)
 {
-    if(loaded)
+    Core & c = Core::getInstance();
+    command_result cr = CR_NOT_IMPLEMENTED;
+    access->lock_add();
+    if(state == PS_LOADED)
     {
-        plugin_shutdown(&Core::getInstance());
-        ClosePlugin(plugin_lib);
+        for (int i = 0; i < commands.size();i++)
+        {
+            if(commands[i].name == command)
+            {
+                cr = commands[i].function(&c, parameters);
+                break;
+            }
+        }
     }
+    access->lock_sub();
+    return cr;
 }
 
-bool Plugin::isLoaded() const
+command_result Plugin::on_update()
 {
-    return loaded;
+    Core & c = Core::getInstance();
+    command_result cr = CR_NOT_IMPLEMENTED;
+    access->lock_add();
+    if(state == PS_LOADED && plugin_onupdate)
+    {
+        cr = plugin_onupdate(&c);
+    }
+    access->lock_sub();
+    return cr;
+}
+
+Plugin::plugin_state Plugin::getState() const
+{
+    return state;
 }
 
 PluginManager::PluginManager(Core * core)
@@ -143,18 +313,14 @@ PluginManager::PluginManager(Core * core)
     string path = core->p->getPath() + "\\plugins\\";
     const string searchstr = ".plug.dll";
 #endif
+    cmdlist_mutex = SDL_CreateMutex();
     vector <string> filez;
     getdir(path, filez);
     for(int i = 0; i < filez.size();i++)
     {
         if(hasEnding(filez[i],searchstr))
         {
-            Plugin * p = new Plugin(core, path + filez[i]);
-            Plugin & pr = *p;
-            for(int j = 0; j < pr.size();j++)
-            {
-                commands[p->commands[j].name] = &pr[j];
-            }
+            Plugin * p = new Plugin(core, path + filez[i], filez[i], this);
             all_plugins.push_back(p);
         }
     }
@@ -162,15 +328,15 @@ PluginManager::PluginManager(Core * core)
 
 PluginManager::~PluginManager()
 {
-    commands.clear();
     for(int i = 0; i < all_plugins.size();i++)
     {
         delete all_plugins[i];
     }
     all_plugins.clear();
+    SDL_DestroyMutex(cmdlist_mutex);
 }
 
-const Plugin *PluginManager::getPluginByName (const std::string & name)
+Plugin *PluginManager::getPluginByName (const std::string & name)
 {
     for(int i = 0; i < all_plugins.size(); i++)
     {
@@ -183,23 +349,45 @@ const Plugin *PluginManager::getPluginByName (const std::string & name)
 // FIXME: handle name collisions...
 command_result PluginManager::InvokeCommand( std::string & command, std::vector <std::string> & parameters)
 {
+    command_result cr = CR_NOT_IMPLEMENTED;
     Core * c = &Core::getInstance();
-    map <string, const PluginCommand *>::iterator iter = commands.find(command);
-    if(iter != commands.end())
+    SDL_mutexP(cmdlist_mutex);
+    map <string, Plugin *>::iterator iter = belongs.find(command);
+    if(iter != belongs.end())
     {
-        return iter->second->function(c,parameters);
+        cr = iter->second->invoke(command, parameters);
     }
-    return CR_NOT_IMPLEMENTED;
+    SDL_mutexV(cmdlist_mutex);
+    return cr;
 }
 
 void PluginManager::OnUpdate( void )
 {
-    Core * c = &Core::getInstance();
     for(int i = 0; i < all_plugins.size(); i++)
     {
-        if(all_plugins[i]->plugin_onupdate)
-        {
-            all_plugins[i]->plugin_onupdate(c);
-        }
+        all_plugins[i]->on_update();
+    }
+}
+// FIXME: doesn't check name collisions!
+void PluginManager::registerCommands( Plugin * p )
+{
+    SDL_mutexP(cmdlist_mutex);
+    vector <PluginCommand> & cmds = p->commands;
+    for(int i = 0; i < cmds.size();i++)
+    {
+        belongs[cmds[i].name] = p;
     }
+    SDL_mutexV(cmdlist_mutex);
 }
+
+// FIXME: doesn't check name collisions!
+void PluginManager::unregisterCommands( Plugin * p )
+{
+    SDL_mutexP(cmdlist_mutex);
+    vector <PluginCommand> & cmds = p->commands;
+    for(int i = 0; i < cmds.size();i++)
+    {
+        belongs.erase(cmds[i].name);
+    }
+    SDL_mutexV(cmdlist_mutex);
+}

library/include/dfhack/PluginManager.h

@@ -28,6 +28,7 @@ distribution.
 #include <map>
 #include <string>
 #include <vector>
+#include "FakeSDL.h"
 struct DFLibrary;
 namespace DFHack
 {
@@ -62,11 +63,23 @@ namespace DFHack
     };
     class Plugin
     {
+        struct RefLock;
+        enum plugin_state
+        {
+            PS_UNLOADED,
+            PS_LOADED,
+            PS_BROKEN
+        };
         friend class PluginManager;
-    public:
-        Plugin(DFHack::Core* core, const std::string& file);
+        Plugin(DFHack::Core* core, const std::string& filepath, const std::string& filename, PluginManager * pm);
         ~Plugin();
-        bool isLoaded () const;
+        command_result on_update();
+    public:
+        bool load();
+        bool unload();
+        bool reload();
+        command_result invoke( std::string & command, std::vector <std::string> & parameters );
+        plugin_state getState () const;
         const PluginCommand& operator[] (std::size_t index) const
         {
             return commands[index];
@@ -80,11 +93,13 @@ namespace DFHack
             return name;
         }
     private:
+        RefLock * access;
         std::vector <PluginCommand> commands;
         std::string filename;
         std::string name;
         DFLibrary * plugin_lib;
-        bool loaded;
+        PluginManager * parent;
+        plugin_state state;
         command_result (*plugin_init)(Core *, std::vector <PluginCommand> &);
         command_result (*plugin_status)(Core *, std::string &);
         command_result (*plugin_shutdown)(Core *);
@@ -94,14 +109,17 @@ namespace DFHack
     {
     // PRIVATE METHODS
         friend class Core;
+        friend class Plugin;
         PluginManager(Core * core);
         ~PluginManager();
         void OnUpdate( void );
+        void registerCommands( Plugin * p );
+        void unregisterCommands( Plugin * p );
     // PUBLIC METHODS
     public:
-        const Plugin *getPluginByName (const std::string & name);
+        Plugin *getPluginByName (const std::string & name);
         command_result InvokeCommand( std::string & command, std::vector <std::string> & parameters );
-        const Plugin* operator[] (std::size_t index)
+        Plugin* operator[] (std::size_t index)
         {
             if(index >= all_plugins.size())
                 return 0;
@@ -113,7 +131,8 @@ namespace DFHack
         }
     // DATA
     private:
-        std::map <std::string, const PluginCommand *> commands;
+        SDL::Mutex * cmdlist_mutex;
+        std::map <std::string, Plugin *> belongs;
         std::vector <Plugin *> all_plugins;
         std::string plugin_path;
     };

plugins/qtplug/qtplug.cpp

@@ -39,7 +39,7 @@ DFhackCExport command_result plugin_init ( Core * c, std::vector <PluginCommand>
 
 DFhackCExport command_result plugin_shutdown ( Core * c )
 {
-    return CR_OK;
+    return CR_FAILURE;
 }
 
 DFhackCExport command_result runqt (Core * c, vector <string> & parameters)