actions: add action for environment update

NEWS

@@ -22,6 +22,7 @@ ncmpcpp-0.7 (????-??-??)
 * NCurses terminal sequence escaping is no longer used as it's not accurate enough.
 * Selecting items no longer depends on space mode and is bound by default to Insert key.
 * Support for Alt, Ctrl and Shift modifiers as well as Escape key was added.
+* Action that updates the environment can now be used in bindings configuration file.
 
 ncmpcpp-0.6.4 (2015-05-02)
 

doc/bindings

@@ -114,6 +114,13 @@
 ##    could be used. Then ncmpcpp will not wait for confirmation
 ##    (enter) and will execute the command the moment it sees it.
 ##
+##    Note: while command chains are executed, internal environment
+##    update (which includes current window refresh and mpd status
+##    update) is not performed for performance reasons. However, it
+##    may be desirable to do so in some situration. Therefore it's
+##    possible to invoke by hand by performing 'update enviroment'
+##    action.
+##
 ## Note: There is a difference between:
 ##
 ##         def_key "key"

src/actions.cpp

@@ -301,6 +301,36 @@ BaseAction *get(const std::string &name)
 	return result;
 }
 
+UpdateEnvironment::UpdateEnvironment()
+: BaseAction(Type::UpdateEnvironment, "update_environment")
+, m_past(boost::posix_time::from_time_t(0))
+{ }
+
+void UpdateEnvironment::run(bool update_timer, bool refresh_window)
+{
+	using Global::Timer;
+
+	// update timer, status if necessary etc.
+	Status::trace(update_timer, true);
+
+	// header stuff
+	if ((myScreen == myPlaylist || myScreen == myBrowser || myScreen == myLyrics)
+	&&  (Timer - m_past > boost::posix_time::milliseconds(500))
+	)
+	{
+		drawHeader();
+		m_past = Timer;
+	}
+
+	if (refresh_window)
+		myScreen->refreshWindow();
+}
+
+void UpdateEnvironment::run()
+{
+	run(true, true);
+}
+
 bool MouseEvent::canBeRun()
 {
 	return Config.mouse_support;
@@ -2427,6 +2457,7 @@ void populateActions()
 		AvailableActions[static_cast<size_t>(a->type())] = a;
 	};
 	insert_action(new Actions::Dummy());
+	insert_action(new Actions::UpdateEnvironment());
 	insert_action(new Actions::MouseEvent());
 	insert_action(new Actions::ScrollUp());
 	insert_action(new Actions::ScrollDown());

src/actions.h

@@ -21,6 +21,7 @@
 #ifndef NCMPCPP_ACTIONS_H
 #define NCMPCPP_ACTIONS_H
 
+#include <boost/date_time/posix_time/posix_time_types.hpp>
 #include <boost/format.hpp>
 #include <map>
 #include <string>
@@ -34,7 +35,7 @@ namespace Actions {
 enum class Type
 {
 	MacroUtility = 0,
-	Dummy, MouseEvent, ScrollUp, ScrollDown, ScrollUpArtist, ScrollUpAlbum,
+	Dummy, UpdateEnvironment, MouseEvent, ScrollUp, ScrollDown, ScrollUpArtist, ScrollUpAlbum,
 	ScrollDownArtist, ScrollDownAlbum, PageUp, PageDown, MoveHome, MoveEnd,
 	ToggleInterface, JumpToParentDirectory, PressEnter, PressSpace, PreviousColumn,
 	NextColumn, MasterScreen, SlaveScreen, VolumeUp, VolumeDown, DeletePlaylistItems,
@@ -122,6 +123,18 @@ private:
 	virtual void run() OVERRIDE { }
 };
 
+struct UpdateEnvironment: BaseAction
+{
+	UpdateEnvironment();
+
+	void run(bool update_status, bool refresh_window);
+
+private:
+	boost::posix_time::ptime m_past;
+
+	virtual void run() OVERRIDE;
+};
+
 struct MouseEvent: BaseAction
 {
 	MouseEvent(): BaseAction(Type::MouseEvent, "mouse_event")
@@ -134,9 +147,8 @@ private:
 	virtual bool canBeRun() OVERRIDE;
 	virtual void run() OVERRIDE;
 	
-	private:
-		MEVENT m_mouse_event;
-		MEVENT m_old_mouse_event;
+	MEVENT m_mouse_event;
+	MEVENT m_old_mouse_event;
 };
 
 struct ScrollUp: BaseAction

src/ncmpcpp.cpp

@@ -162,7 +162,9 @@ int main(int argc, char **argv)
 	bool key_pressed = false;
 	auto input = NC::Key::None;
 	auto connect_attempt = boost::posix_time::from_time_t(0);
-	auto past = boost::posix_time::from_time_t(0);
+	auto update_environment = static_cast<Actions::UpdateEnvironment &>(
+		Actions::get(Actions::Type::UpdateEnvironment)
+	);
 	
 	while (!Actions::ExitMainLoop)
 	{
@@ -190,29 +192,16 @@ int main(int argc, char **argv)
 				}
 			}
 
-			// update timer, status if necessary etc.
-			Status::trace(!key_pressed, true);
-
 			if (run_resize_screen)
 			{
 				Actions::resizeScreen(true);
 				run_resize_screen = false;
 			}
 
-			// header stuff
-			if ((myScreen == myPlaylist || myScreen == myBrowser || myScreen == myLyrics)
-			&&  (Timer - past > boost::posix_time::milliseconds(500))
-			)
-			{
-				drawHeader();
-				past = Timer;
-			}
+			update_environment.run(!key_pressed, key_pressed);
 
-			if (key_pressed)
-				myScreen->refreshWindow();
 			input = readKey(*wFooter);
 			key_pressed = input != NC::Key::None;
-			
 			if (!key_pressed)
 				continue;