actions: add support for range selection and make a few actions work on ranges

NEWS

@@ -26,6 +26,7 @@ ncmpcpp-0.7 (????-??-??)
 * Searching in text fields now respects regular expression configuration.
 * Monolithic 'press_space' action was split into 'add_item_to_playlist', 'toggle_lyrics_update_on_song_change' and 'toggle_visualization_type'.
 * Sorting actions were rebound to Ctrl-S.
+* Support for range selection was added (bound to Ctrl-V by default). In addition, sorting, reversing and shuffling items in playlist now works on ranges.
 
 ncmpcpp-0.6.4 (2015-05-02)
 

doc/bindings

@@ -415,6 +415,9 @@
 #def_key "l"
 #  show_lyrics
 #
+#def_key "ctrl_v"
+#  select_range
+#
 #def_key "v"
 #  reverse_selection
 #

src/actions.cpp

@@ -89,6 +89,15 @@ void seek();
 void findItem(const SearchDirection direction);
 void listsChangeFinisher();
 
+template <typename Iterator>
+bool findSelectedRangeAndPrintInfoIfNot(Iterator &first, Iterator &last)
+{
+	bool success = findSelectedRange(first, last);
+	if (!success)
+		Statusbar::print("No range selected");
+	return success;
+}
+
 }
 
 namespace Actions {
@@ -1173,11 +1182,19 @@ void ToggleRepeat::run()
 	Mpd.SetRepeat(!Status::State::repeat());
 }
 
+bool Shuffle::canBeRun()
+{
+	if (myScreen != myPlaylist)
+		return false;
+	m_begin = myPlaylist->main().begin();
+	m_end = myPlaylist->main().end();
+	return findSelectedRangeAndPrintInfoIfNot(m_begin, m_end);
+}
+
 void Shuffle::run()
 {
-	auto begin = myPlaylist->main().begin(), end = myPlaylist->main().end();
-	auto range = getSelectedRange(begin, end);
-	Mpd.ShuffleRange(range.first-begin, range.second-begin);
+	auto begin = myPlaylist->main().begin();
+	Mpd.ShuffleRange(m_begin-begin, m_end-begin);
 	Statusbar::print("Range shuffled");
 }
 
@@ -1654,6 +1671,23 @@ void SelectItem::run()
 	current->setSelected(!current->isSelected());
 }
 
+bool SelectRange::canBeRun()
+{
+	m_list = dynamic_cast<NC::List *>(myScreen->activeWindow());
+	if (m_list == nullptr)
+		return false;
+	m_begin = m_list->beginP();
+	m_end = m_list->endP();
+	return findRange(m_begin, m_end);
+}
+
+void SelectRange::run()
+{
+	for (; m_begin != m_end; ++m_begin)
+		m_begin->setSelected(true);
+	Statusbar::print("Range selected");
+}
+
 bool ReverseSelection::canBeRun()
 {
 	m_list = dynamic_cast<NC::List *>(myScreen->activeWindow());
@@ -1793,7 +1827,10 @@ void ClearPlaylist::run()
 
 bool SortPlaylist::canBeRun()
 {
-	return myScreen == myPlaylist;
+	if (myScreen != myPlaylist)
+		return false;
+	auto first = myPlaylist->main().begin(), last = myPlaylist->main().end();
+	return findSelectedRangeAndPrintInfoIfNot(first, last);
 }
 
 void SortPlaylist::run()
@@ -1803,12 +1840,21 @@ void SortPlaylist::run()
 
 bool ReversePlaylist::canBeRun()
 {
-	return myScreen == myPlaylist;
+	if (myScreen != myPlaylist)
+		return false;
+	m_begin = myPlaylist->main().begin();
+	m_end = myPlaylist->main().end();
+	return findSelectedRangeAndPrintInfoIfNot(m_begin, m_end);
 }
 
 void ReversePlaylist::run()
 {
-	myPlaylist->Reverse();
+	Statusbar::print("Reversing range...");
+	Mpd.StartCommandsList();
+	for (--m_end; m_begin < m_end; ++m_begin, --m_end)
+		Mpd.Swap(m_begin->value().getPosition(), m_end->value().getPosition());
+	Mpd.CommitCommandsList();
+	Statusbar::print("Range reversed");
 }
 
 bool Find::canBeRun()
@@ -2512,6 +2558,7 @@ void populateActions()
 	insert_action(new Actions::JumpToParentDirectory());
 	insert_action(new Actions::PressEnter());
 	insert_action(new Actions::SelectItem());
+	insert_action(new Actions::SelectRange());
 	insert_action(new Actions::PreviousColumn());
 	insert_action(new Actions::NextColumn());
 	insert_action(new Actions::MasterScreen());

src/actions.h

@@ -49,7 +49,7 @@ enum class Type
 	SetCrossfade, SetVolume, EditSong, EditLibraryTag, EditLibraryAlbum, EditDirectoryName,
 	EditPlaylistName, EditLyrics, JumpToBrowser, JumpToMediaLibrary,
 	JumpToPlaylistEditor, ToggleScreenLock, JumpToTagEditor, JumpToPositionInSong,
-	SelectItem, ReverseSelection, RemoveSelection, SelectAlbum, AddSelectedItems,
+	SelectItem, SelectRange, ReverseSelection, RemoveSelection, SelectAlbum, AddSelectedItems,
 	CropMainPlaylist, CropPlaylist, ClearMainPlaylist, ClearPlaylist, SortPlaylist,
 	ReversePlaylist, Find, FindItemForward, FindItemBackward,
 	NextFoundItem, PreviousFoundItem, ToggleFindMode, ToggleReplayGainMode,
@@ -581,7 +581,11 @@ struct Shuffle: BaseAction
 	Shuffle(): BaseAction(Type::Shuffle, "shuffle") { }
 	
 private:
+	virtual bool canBeRun() OVERRIDE;
 	virtual void run() OVERRIDE;
+
+	NC::Menu<MPD::Song>::ConstIterator m_begin;
+	NC::Menu<MPD::Song>::ConstIterator m_end;
 };
 
 struct ToggleRandom: BaseAction
@@ -776,6 +780,19 @@ private:
 	NC::List *m_list;
 };
 
+struct SelectRange: BaseAction
+{
+	SelectRange(): BaseAction(Type::SelectRange, "select_range") { }
+
+private:
+	virtual bool canBeRun() OVERRIDE;
+	virtual void run() OVERRIDE;
+
+	NC::List *m_list;
+	NC::List::Iterator m_begin;
+	NC::List::Iterator m_end;
+};
+
 struct ReverseSelection: BaseAction
 {
 	ReverseSelection(): BaseAction(Type::ReverseSelection, "reverse_selection") { }
@@ -869,6 +886,9 @@ struct ReversePlaylist: BaseAction
 private:
 	virtual bool canBeRun() OVERRIDE;
 	virtual void run() OVERRIDE;
+
+	NC::Menu<MPD::Song>::ConstIterator m_begin;
+	NC::Menu<MPD::Song>::ConstIterator m_end;
 };
 
 struct Find: BaseAction

src/bindings.cpp

@@ -630,6 +630,8 @@ void BindingsConfiguration::generateDefaults()
 		bind(k, Actions::Type::JumpToPositionInSong);
 	if (notBound(k = stringToKey("l")))
 		bind(k, Actions::Type::ShowLyrics);
+	if (notBound(k = stringToKey("ctrl_v")))
+		bind(k, Actions::Type::SelectRange);
 	if (notBound(k = stringToKey("v")))
 		bind(k, Actions::Type::ReverseSelection);
 	if (notBound(k = stringToKey("V")))

src/help.cpp

@@ -178,6 +178,7 @@ void write_bindings(NC::Scrollpad &w)
 	w << '\n';
 	key(w, Type::ToggleAddMode, "Toggle add mode (add or remove/always add)");
 	key(w, Type::ToggleMouse, "Toggle mouse support");
+	key(w, Type::SelectRange, "Select range");
 	key(w, Type::ReverseSelection, "Reverse selection");
 	key(w, Type::RemoveSelection, "Remove selection");
 	key(w, Type::SelectItem, "Select current item");
@@ -191,7 +192,6 @@ void write_bindings(NC::Scrollpad &w)
 	key(w, Type::ToggleConsume, "Toggle consume mode");
 	key(w, Type::ToggleReplayGainMode, "Toggle replay gain mode");
 	key(w, Type::ToggleBitrateVisibility, "Toggle bitrate visibility");
-	key(w, Type::Shuffle, "Shuffle selected range in playlist");
 	key(w, Type::ToggleCrossfade, "Toggle crossfade mode");
 	key(w, Type::SetCrossfade, "Set crossfade");
 	key(w, Type::SetVolume, "Set volume");
@@ -239,8 +239,9 @@ void write_bindings(NC::Scrollpad &w)
 	key(w, Type::EditSong, "Edit song");
 #	endif // HAVE_TAGLIB_H
 	key(w, Type::SavePlaylist, "Save playlist");
-	key(w, Type::SortPlaylist, "Sort playlist");
-	key(w, Type::ReversePlaylist, "Reverse playlist");
+	key(w, Type::Shuffle, "Shuffle range");
+	key(w, Type::SortPlaylist, "Sort range");
+	key(w, Type::ReversePlaylist, "Reverse range");
 	key(w, Type::JumpToPlayingSong, "Jump to current song");
 	key(w, Type::TogglePlayingSongCentering, "Toggle playing song centering");
 

src/helpers.h

@@ -113,21 +113,40 @@ std::vector<Iterator> getSelected(Iterator first, Iterator last)
 	return result;
 }
 
-/// @return selected range within given range or original range if no item is selected
+/// @return true if range that begins and ends with selected items was found
 template <typename Iterator>
-std::pair<Iterator, Iterator> getSelectedRange(Iterator first, Iterator second)
+bool findRange(Iterator &first, Iterator &last)
 {
-	auto result = std::make_pair(first, second);
-	if (hasSelected(first, second))
+	for (; first != last; ++first)
 	{
-		while (!result.first->isSelected())
-			++result.first;
-		do
-			--result.second;
-		while (!result.second->isSelected());
-		++result.second;
+		if (first->isSelected())
+			break;
 	}
-	return result;
+	if (first == last)
+		return false;
+	--last;
+	for (; first != last; --last)
+	{
+		if (last->isSelected())
+			break;
+	}
+	++last;
+	return true;
+}
+
+/// @return true if fully selected range was found, false otherwise.
+template <typename Iterator>
+bool findSelectedRange(Iterator &first, Iterator &last)
+{
+	if (!findRange(first, last))
+		return false;
+	// we have range, now check if it's filled with selected items
+	for (auto it = first; it != last; ++it)
+	{
+		if (!it->isSelected())
+			return false;
+	}
+	return true;
 }
 
 template <typename T>

src/playlist.cpp

@@ -197,18 +197,6 @@ MPD::Song Playlist::nowPlayingSong()
 	return s;
 }
 
-void Playlist::Reverse()
-{
-	Statusbar::print("Reversing playlist order...");
-	auto begin = w.begin(), end = w.end();
-	std::tie(begin, end) = getSelectedRange(begin, end);
-	Mpd.StartCommandsList();
-	for (--end; begin < end; ++begin, --end)
-		Mpd.Swap(begin->value().getPosition(), end->value().getPosition());
-	Mpd.CommitCommandsList();
-	Statusbar::print("Playlist reversed");
-}
-
 void Playlist::EnableHighlighting()
 {
 	w.setHighlighting(true);

src/playlist.h

@@ -62,8 +62,7 @@ struct Playlist: Screen<SongMenu>, HasSongs, Searchable, Tabbable
 	// private members
 	MPD::Song nowPlayingSong();
 	
-	void Reverse();
-	
+
 	void EnableHighlighting();
 	
 	void SetSelectedItemsPriority(int prio);

src/sort_playlist.cpp

@@ -156,8 +156,9 @@ void SortPlaylistDialog::sort() const
 {
 	auto &pl = myPlaylist->main();
 	auto begin = pl.begin(), end = pl.end();
-	std::tie(begin, end) = getSelectedRange(begin, end);
-	
+	if (!findSelectedRange(begin, end))
+		return;
+
 	size_t start_pos = begin - pl.begin();
 	std::vector<MPD::Song> playlist;
 	playlist.reserve(end - begin);
@@ -203,7 +204,7 @@ void SortPlaylistDialog::sort() const
 	Mpd.StartCommandsList();
 	quick_sort(playlist.begin(), playlist.end());
 	Mpd.CommitCommandsList();
-	Statusbar::print("Playlist sorted");
+	Statusbar::print("Range sorted");
 	switchToPreviousScreen();
 }