Fix hang if we press Cmd-S two or more times quickly to launch File > Save

With this we avoid to unintentional execute two or more times a
command when we are already in a command execution.

src/app/app_menus.cpp

@@ -730,7 +730,7 @@ void AppMenus::createNativeMenus()
     about.execute = [native]{
       if (can_call_global_shortcut(&native)) {
         Command* cmd = Commands::instance()->byId(CommandId::About());
-        UIContext::instance()->executeCommand(cmd);
+        UIContext::instance()->executeCommandFromMenuOrShortcut(cmd);
       }
     };
     about.validate = [native](os::MenuItem* item){
@@ -743,7 +743,7 @@ void AppMenus::createNativeMenus()
     preferences.execute = [native]{
       if (can_call_global_shortcut(&native)) {
         Command* cmd = Commands::instance()->byId(CommandId::Options());
-        UIContext::instance()->executeCommand(cmd);
+        UIContext::instance()->executeCommandFromMenuOrShortcut(cmd);
       }
     };
     preferences.validate = [native](os::MenuItem* item){

src/app/context.cpp

@@ -18,7 +18,9 @@
 #include "app/console.h"
 #include "app/doc.h"
 #include "app/site.h"
+#include "base/scoped_value.h"
 #include "doc/layer.h"
+#include "ui/system.h"
 
 #include <algorithm>
 #include <stdexcept>
@@ -93,24 +95,33 @@ void Context::notifyActiveSiteChanged()
   notify_observers<const Site&>(&ContextObserver::onActiveSiteChange, site);
 }
 
-void Context::executeCommand(const char* commandName)
+void Context::executeCommandFromMenuOrShortcut(Command* command, const Params& params)
 {
-  Command* cmd = Commands::instance()->byId(commandName);
-  if (cmd)
-    executeCommand(cmd);
-  else
-    throw std::runtime_error("Invalid command name");
+  ui::assert_ui_thread();
+
+  // With this we avoid executing a command when we are inside another
+  // command (e.g. if we press Cmd-S quickly the program can enter two
+  // times in the File > Save command and hang).
+  static Command* executingCommand = nullptr;
+  if (executingCommand) {         // Ignore command execution
+    LOG(VERBOSE, "CTXT: Ignoring command %s because we are inside %s\n",
+        command->id().c_str(), executingCommand->id().c_str());
+    return;
+  }
+  base::ScopedValue<Command*> commandGuard(executingCommand,
+                                           command, nullptr);
+
+  executeCommand(command, params);
 }
 
 void Context::executeCommand(Command* command, const Params& params)
 {
-  Console console;
-
-  ASSERT(command != NULL);
-  if (command == NULL)
+  ASSERT(command);
+  if (!command)
     return;
 
-  LOG(VERBOSE) << "CTXT: Executing command " << command->id() << "\n";
+  Console console;
+  LOG(VERBOSE, "CTXT: Executing command %s\n", command->id().c_str());
   try {
     m_flags.update(this);
 
@@ -122,14 +133,14 @@ void Context::executeCommand(Command* command, const Params& params)
     BeforeCommandExecution(ev);
 
     if (ev.isCanceled()) {
-      LOG(VERBOSE) << "CTXT: Command " << command->id() << " was canceled/simulated.\n";
+      LOG(VERBOSE, "CTXT: Command %s was canceled/simulated.\n", command->id().c_str());
     }
     else if (command->isEnabled(this)) {
       command->execute(this);
-      LOG(VERBOSE) << "CTXT: Command " << command->id() << " executed successfully\n";
+      LOG(VERBOSE, "CTXT: Command %s executed successfully\n", command->id().c_str());
     }
     else {
-      LOG(VERBOSE) << "CTXT: Command " << command->id() << " is disabled\n";
+      LOG(VERBOSE, "CTXT: Command %s is disabled\n", command->id().c_str());
     }
 
     AfterCommandExecution(ev);
@@ -139,20 +150,19 @@ void Context::executeCommand(Command* command, const Params& params)
       app_rebuild_documents_tabs();
   }
   catch (base::Exception& e) {
-    LOG(ERROR) << "CTXT: Exception caught executing " << command->id() << " command\n"
-               << e.what() << "\n";
-
+    LOG(ERROR, "CTXT: Exception caught executing %s command\n%s\n",
+        command->id().c_str(), e.what());
     Console::showException(e);
   }
   catch (std::exception& e) {
-    LOG(ERROR) << "CTXT: std::exception caught executing " << command->id() << " command\n"
-               << e.what() << "\n";
-
+    LOG(ERROR, "CTXT: std::exception caught executing %s command\n%s\n",
+        command->id().c_str(), e.what());
     console.printf("An error ocurred executing the command.\n\nDetails:\n%s", e.what());
   }
 #ifdef NDEBUG
   catch (...) {
-    LOG(ERROR) << "CTXT: Unknown exception executing " << command->id() << " command\n";
+    LOG(ERROR, "CTXT: Unknown exception executing %s command\n",
+        command->id().c_str());
 
     console.printf("An unknown error ocurred executing the command.\n"
                    "Please save your work, close the program, try it\n"

src/app/context.h

@@ -88,7 +88,7 @@ namespace app {
     bool hasModifiedDocuments() const;
     void notifyActiveSiteChanged();
 
-    void executeCommand(const char* commandName);
+    void executeCommandFromMenuOrShortcut(Command* command, const Params& params = Params());
     virtual void executeCommand(Command* command, const Params& params = Params());
 
     virtual DocView* getFirstDocView(Doc* document) const {

src/app/modules/gui.cpp

@@ -502,7 +502,7 @@ bool CustomizedGuiManager::onProcessMessage(Message* msg)
               if (getForegroundWindow() == App::instance()->mainWindow()) {
                 // OK, so we can execute the command represented
                 // by the pressed-key in the message...
-                UIContext::instance()->executeCommand(
+                UIContext::instance()->executeCommandFromMenuOrShortcut(
                   command, key->params());
                 return true;
               }

src/app/ui/app_menuitem.cpp

@@ -141,7 +141,7 @@ void AppMenuItem::onClick()
 
     UIContext* context = UIContext::instance();
     if (m_command->isEnabled(context)) {
-      context->executeCommand(m_command, params);
+      context->executeCommandFromMenuOrShortcut(m_command, params);
     }
   }
 }

src/app/ui/editor/drawing_state.cpp

@@ -232,7 +232,7 @@ bool DrawingState::onKeyDown(Editor* editor, KeyMessage* msg)
         ->getCommandFromKeyMessage(msg, &command, &params)) {
     // We accept zoom commands.
     if (command->id() == CommandId::Zoom()) {
-      UIContext::instance()->executeCommand(command, params);
+      UIContext::instance()->executeCommandFromMenuOrShortcut(command, params);
       return true;
     }
   }

src/app/ui/editor/moving_pixels_state.cpp

@@ -436,7 +436,7 @@ bool MovingPixelsState::onKeyDown(Editor* editor, KeyMessage* msg)
     // The escape key drop pixels and deselect the mask.
     if (msg->scancode() == kKeyEsc) { // TODO make this key customizable
       Command* cmd = Commands::instance()->byId(CommandId::DeselectMask());
-      UIContext::instance()->executeCommand(cmd);
+      UIContext::instance()->executeCommandFromMenuOrShortcut(cmd);
     }
 
     return true;

src/app/ui/editor/standby_state.cpp

@@ -406,7 +406,7 @@ bool StandbyState::onDoubleClick(Editor* editor, MouseMessage* msg)
     else if (int(editor->getToolLoopModifiers()) & int(tools::ToolLoopModifiers::kIntersectSelection))
       params.set("mode", "intersect");
 
-    UIContext::instance()->executeCommand(selectTileCmd, params);
+    UIContext::instance()->executeCommandFromMenuOrShortcut(selectTileCmd, params);
     return true;
   }
   // Show slice properties when we double-click it
@@ -416,7 +416,7 @@ bool StandbyState::onDoubleClick(Editor* editor, MouseMessage* msg)
       Command* cmd = Commands::instance()->byId(CommandId::SliceProperties());
       Params params;
       params.set("id", base::convert_to<std::string>(hit.slice()->id()).c_str());
-      UIContext::instance()->executeCommand(cmd, params);
+      UIContext::instance()->executeCommandFromMenuOrShortcut(cmd, params);
       return true;
     }
   }

src/app/ui/home_view.cpp

@@ -137,13 +137,13 @@ void HomeView::onWorkspaceViewSelected()
 void HomeView::onNewFile()
 {
   Command* command = Commands::instance()->byId(CommandId::NewFile());
-  UIContext::instance()->executeCommand(command);
+  UIContext::instance()->executeCommandFromMenuOrShortcut(command);
 }
 
 void HomeView::onOpenFile()
 {
   Command* command = Commands::instance()->byId(CommandId::OpenFile());
-  UIContext::instance()->executeCommand(command);
+  UIContext::instance()->executeCommandFromMenuOrShortcut(command);
 }
 
 void HomeView::onResize(ui::ResizeEvent& ev)

src/app/ui/main_window.cpp

@@ -452,7 +452,7 @@ void MainWindow::onTabsContainerDoubleClicked(Tabs* tabs)
   Doc* oldDoc = UIContext::instance()->activeDocument();
 
   Command* command = Commands::instance()->byId(CommandId::NewFile());
-  UIContext::instance()->executeCommand(command);
+  UIContext::instance()->executeCommandFromMenuOrShortcut(command);
 
   Doc* newDoc = UIContext::instance()->activeDocument();
   if (newDoc != oldDoc) {

src/app/ui/palette_popup.cpp

@@ -111,7 +111,7 @@ void PalettePopup::onLoadPal()
   SetPaletteCommand* cmd = static_cast<SetPaletteCommand*>(
     Commands::instance()->byId(CommandId::SetPalette()));
   cmd->setPalette(palette);
-  UIContext::instance()->executeCommand(cmd);
+  UIContext::instance()->executeCommandFromMenuOrShortcut(cmd);
 
   m_paletteListBox.requestFocus();
 }

src/app/ui/recent_listbox.cpp

@@ -308,7 +308,7 @@ void RecentFilesListBox::onClick(const std::string& path)
   Command* command = Commands::instance()->byId(CommandId::OpenFile());
   Params params;
   params.set("filename", path.c_str());
-  UIContext::instance()->executeCommand(command, params);
+  UIContext::instance()->executeCommandFromMenuOrShortcut(command, params);
 }
 
 void RecentFilesListBox::onUpdateRecentListFromUIItems(const base::paths& pinnedPaths,
@@ -346,7 +346,7 @@ void RecentFoldersListBox::onClick(const std::string& path)
   Command* command = Commands::instance()->byId(CommandId::OpenFile());
   Params params;
   params.set("folder", path.c_str());
-  UIContext::instance()->executeCommand(command, params);
+  UIContext::instance()->executeCommandFromMenuOrShortcut(command, params);
 }
 
 void RecentFoldersListBox::onUpdateRecentListFromUIItems(const base::paths& pinnedPaths,

src/app/ui/status_bar.cpp

@@ -515,7 +515,7 @@ public:
           Command* cmd = Commands::instance()->byId(CommandId::GotoFrame());
           Params params;
           params.set("frame", text().c_str());
-          UIContext::instance()->executeCommand(cmd, params);
+          UIContext::instance()->executeCommandFromMenuOrShortcut(cmd, params);
 
           // Select the text again
           selectAllText();
@@ -813,7 +813,7 @@ void StatusBar::onPixelFormatChanged(DocEvent& ev)
 void StatusBar::newFrame()
 {
   Command* cmd = Commands::instance()->byId(CommandId::NewFrame());
-  UIContext::instance()->executeCommand(cmd);
+  UIContext::instance()->executeCommandFromMenuOrShortcut(cmd);
 }
 
 void StatusBar::onChangeZoom(const render::Zoom& zoom)

src/app/ui/timeline/ani_controls.cpp

@@ -83,7 +83,7 @@ void AniControls::onClickButton()
 
   Command* cmd = Commands::instance()->byId(getCommandId(item));
   if (cmd) {
-    UIContext::instance()->executeCommand(cmd);
+    UIContext::instance()->executeCommandFromMenuOrShortcut(cmd);
     updateUsingEditor(current_editor);
   }
 }