playlist editor: add data fetch delay after position changes

[ncmpcpp.git] / src / actions.cpp

/***************************************************************************
 *   Copyright (C) 2008-2014 by Andrzej Rybczak                            *
 *   electricityispower@gmail.com                                          *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
 ***************************************************************************/

#include <cassert>
#include <cerrno>
#include <cstring>
#include <boost/array.hpp>
#include <boost/bind.hpp>
#include <boost/locale/conversion.hpp>
#include <boost/lexical_cast.hpp>
#include <algorithm>
#include <iostream>
#include <readline/readline.h>

#include "actions.h"
#include "charset.h"
#include "config.h"
#include "display.h"
#include "global.h"
#include "mpdpp.h"
#include "helpers.h"
#include "statusbar.h"
#include "utility/comparators.h"
#include "utility/conversion.h"

#include "bindings.h"
#include "browser.h"
#include "clock.h"
#include "help.h"
#include "media_library.h"
#include "lastfm.h"
#include "lyrics.h"
#include "playlist.h"
#include "playlist_editor.h"
#include "sort_playlist.h"
#include "search_engine.h"
#include "sel_items_adder.h"
#include "server_info.h"
#include "song_info.h"
#include "outputs.h"
#include "utility/string.h"
#include "utility/type_conversions.h"
#include "tag_editor.h"
#include "tiny_tag_editor.h"
#include "visualizer.h"
#include "title.h"
#include "tags.h"

#ifdef HAVE_TAGLIB_H
# include "fileref.h"
# include "tag.h"
#endif // HAVE_TAGLIB_H

using Global::myScreen;

namespace {//

enum class Find { Forward, Backward };

boost::array<
        Actions::BaseAction *, static_cast<size_t>(Actions::Type::_numberOfActions)
> AvailableActions;

void populateActions();

void seek();
void findItem(const Find direction);
void listsChangeFinisher();

}

namespace Actions {//

bool OriginalStatusbarVisibility;
bool ExitMainLoop = false;

size_t HeaderHeight;
size_t FooterHeight;
size_t FooterStartY;

void validateScreenSize()
{
        using Global::MainHeight;
        
        if (COLS < 30 || MainHeight < 5)
        {
                NC::destroyScreen();
                std::cout << "Screen is too small to handle ncmpcpp correctly\n";
                exit(1);
        }
}

void initializeScreens()
{
        myHelp = new Help;
        myPlaylist = new Playlist;
        myBrowser = new Browser;
        mySearcher = new SearchEngine;
        myLibrary = new MediaLibrary;
        myPlaylistEditor = new PlaylistEditor;
        myLyrics = new Lyrics;
        mySelectedItemsAdder = new SelectedItemsAdder;
        mySongInfo = new SongInfo;
        myServerInfo = new ServerInfo;
        mySortPlaylistDialog = new SortPlaylistDialog;
        
#       ifdef HAVE_CURL_CURL_H
        myLastfm = new Lastfm;
#       endif // HAVE_CURL_CURL_H
        
#       ifdef HAVE_TAGLIB_H
        myTinyTagEditor = new TinyTagEditor;
        myTagEditor = new TagEditor;
#       endif // HAVE_TAGLIB_H
        
#       ifdef ENABLE_VISUALIZER
        myVisualizer = new Visualizer;
#       endif // ENABLE_VISUALIZER
        
#       ifdef ENABLE_OUTPUTS
        myOutputs = new Outputs;
#       endif // ENABLE_OUTPUTS
        
#       ifdef ENABLE_CLOCK
        myClock = new Clock;
#       endif // ENABLE_CLOCK
        
}

void setResizeFlags()
{
        myHelp->hasToBeResized = 1;
        myPlaylist->hasToBeResized = 1;
        myBrowser->hasToBeResized = 1;
        mySearcher->hasToBeResized = 1;
        myLibrary->hasToBeResized = 1;
        myPlaylistEditor->hasToBeResized = 1;
        myLyrics->hasToBeResized = 1;
        mySelectedItemsAdder->hasToBeResized = 1;
        mySongInfo->hasToBeResized = 1;
        myServerInfo->hasToBeResized = 1;
        mySortPlaylistDialog->hasToBeResized = 1;
        
#       ifdef HAVE_CURL_CURL_H
        myLastfm->hasToBeResized = 1;
#       endif // HAVE_CURL_CURL_H
        
#       ifdef HAVE_TAGLIB_H
        myTinyTagEditor->hasToBeResized = 1;
        myTagEditor->hasToBeResized = 1;
#       endif // HAVE_TAGLIB_H
        
#       ifdef ENABLE_VISUALIZER
        myVisualizer->hasToBeResized = 1;
#       endif // ENABLE_VISUALIZER
        
#       ifdef ENABLE_OUTPUTS
        myOutputs->hasToBeResized = 1;
#       endif // ENABLE_OUTPUTS
        
#       ifdef ENABLE_CLOCK
        myClock->hasToBeResized = 1;
#       endif // ENABLE_CLOCK
}

void resizeScreen(bool reload_main_window)
{
        using Global::MainHeight;
        using Global::wHeader;
        using Global::wFooter;
        
#       if defined(USE_PDCURSES)
        resize_term(0, 0);
#       else
        // update internal screen dimensions
        if (reload_main_window)
        {
                rl_resize_terminal();
                endwin();
                refresh();
        }
#       endif
        
        MainHeight = LINES-(Config.design == Design::Alternative ? 7 : 4);
        
        validateScreenSize();
        
        if (!Config.header_visibility)
                MainHeight += 2;
        if (!Config.statusbar_visibility)
                ++MainHeight;
        
        setResizeFlags();
        
        applyToVisibleWindows(&BaseScreen::resize);
        
        if (Config.header_visibility || Config.design == Design::Alternative)
                wHeader->resize(COLS, HeaderHeight);
        
        FooterStartY = LINES-(Config.statusbar_visibility ? 2 : 1);
        wFooter->moveTo(0, FooterStartY);
        wFooter->resize(COLS, Config.statusbar_visibility ? 2 : 1);
        
        applyToVisibleWindows(&BaseScreen::refresh);
        
        Status::Changes::elapsedTime(false);
        Status::Changes::playerState();
        // Note: routines for drawing separator if alternative user
        // interface is active and header is hidden are placed in
        // NcmpcppStatusChanges.StatusFlags
        Status::Changes::flags();
        drawHeader();
        wFooter->refresh();
        refresh();
}

void setWindowsDimensions()
{
        using Global::MainStartY;
        using Global::MainHeight;
        
        MainStartY = Config.design == Design::Alternative ? 5 : 2;
        MainHeight = LINES-(Config.design == Design::Alternative ? 7 : 4);
        
        if (!Config.header_visibility)
        {
                MainStartY -= 2;
                MainHeight += 2;
        }
        if (!Config.statusbar_visibility)
                ++MainHeight;
        
        HeaderHeight = Config.design == Design::Alternative ? (Config.header_visibility ? 5 : 3) : 1;
        FooterStartY = LINES-(Config.statusbar_visibility ? 2 : 1);
        FooterHeight = Config.statusbar_visibility ? 2 : 1;
}

bool askYesNoQuestion(const boost::format &fmt, void (*callback)())
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << fmt.str() << " [" << NC::Format::Bold << 'y' << NC::Format::NoBold << '/' << NC::Format::Bold << 'n' << NC::Format::NoBold << "]";
        wFooter->refresh();
        int answer = 0;
        do
        {
                if (callback)
                        callback();
                answer = wFooter->readKey();
        }
        while (answer != 'y' && answer != 'n');
        Statusbar::unlock();
        return answer == 'y';
}

bool isMPDMusicDirSet()
{
        if (Config.mpd_music_dir.empty())
        {
                Statusbar::print("Proper mpd_music_dir variable has to be set in configuration file");
                return false;
        }
        return true;
}

BaseAction &get(Actions::Type at)
{
        if (AvailableActions[1] == nullptr)
                populateActions();
        BaseAction *action = AvailableActions[static_cast<size_t>(at)];
        // action should be always present if action type in queried
        assert(action != nullptr);
        return *action;
}

BaseAction *get(const std::string &name)
{
        BaseAction *result = 0;
        if (AvailableActions[1] == nullptr)
                populateActions();
        for (auto it = AvailableActions.begin(); it != AvailableActions.end(); ++it)
        {
                if (*it != nullptr && (*it)->name() == name)
                {
                        result = *it;
                        break;
                }
        }
        return result;
}

bool MouseEvent::canBeRun() const
{
        return Config.mouse_support;
}

void MouseEvent::run()
{
        using Global::VolumeState;
        
        m_old_mouse_event = m_mouse_event;
        getmouse(&m_mouse_event);
        // workaround shitty ncurses behavior introduced in >=5.8, when we mysteriously get
        // a few times after ncmpcpp startup 2^27 code instead of BUTTON{1,3}_RELEASED. since that
        // 2^27 thing shows constantly instead of BUTTON2_PRESSED, it was redefined to be recognized
        // as BUTTON2_PRESSED. but clearly we don't want to trigger behavior bound to BUTTON2
        // after BUTTON{1,3} was pressed. so, here is the workaround: if last event was BUTTON{1,3}_PRESSED,
        // we MUST get BUTTON{1,3}_RELEASED afterwards. if we get BUTTON2_PRESSED, erroneus behavior
        // is about to occur and we need to prevent that.
        if (m_old_mouse_event.bstate & (BUTTON1_PRESSED | BUTTON3_PRESSED) && m_mouse_event.bstate & BUTTON2_PRESSED)
                return;
        if (m_mouse_event.bstate & BUTTON1_PRESSED
        &&  m_mouse_event.y == LINES-(Config.statusbar_visibility ? 2 : 1)
           ) // progressbar
        {
                if (Status::State::player() == MPD::psStop)
                        return;
                Mpd.Seek(myPlaylist->currentSongPosition(),
                        myPlaylist->currentSongLength()*m_mouse_event.x/double(COLS));
        }
        else if (m_mouse_event.bstate & BUTTON1_PRESSED
             &&  (Config.statusbar_visibility || Config.design == Design::Alternative)
             &&  Status::State::player() != MPD::psStop
             &&  m_mouse_event.y == (Config.design == Design::Alternative ? 1 : LINES-1)
                         &&  m_mouse_event.x < 9
                ) // playing/paused
        {
                Mpd.Toggle();
        }
        else if ((m_mouse_event.bstate & BUTTON2_PRESSED || m_mouse_event.bstate & BUTTON4_PRESSED)
             &&  (Config.header_visibility || Config.design == Design::Alternative)
             &&  m_mouse_event.y == 0 && size_t(m_mouse_event.x) > COLS-VolumeState.length()
        ) // volume
        {
                if (m_mouse_event.bstate & BUTTON2_PRESSED)
                        get(Type::VolumeDown).execute();
                else
                        get(Type::VolumeUp).execute();
        }
        else if (m_mouse_event.bstate & (BUTTON1_PRESSED | BUTTON2_PRESSED | BUTTON3_PRESSED | BUTTON4_PRESSED))
                myScreen->mouseButtonPressed(m_mouse_event);
}

void ScrollUp::run()
{
        myScreen->scroll(NC::Scroll::Up);
        listsChangeFinisher();
}

void ScrollDown::run()
{
        myScreen->scroll(NC::Scroll::Down);
        listsChangeFinisher();
}

bool ScrollUpArtist::canBeRun() const
{
        return proxySongList(myScreen);
}

void ScrollUpArtist::run()
{
        auto pl = proxySongList(myScreen);
        assert(pl);
        size_t pos = pl.choice();
        if (MPD::Song *s = pl.getSong(pos))
        {
                std::string artist = s->getArtist();
                while (pos > 0)
                {
                        s = pl.getSong(--pos);
                        if (!s || s->getArtist() != artist)
                                break;
                }
                pl.highlight(pos);
        }
}

bool ScrollUpAlbum::canBeRun() const
{
        return proxySongList(myScreen);
}

void ScrollUpAlbum::run()
{
        auto pl = proxySongList(myScreen);
        assert(pl);
        size_t pos = pl.choice();
        if (MPD::Song *s = pl.getSong(pos))
        {
                std::string album = s->getAlbum();
                while (pos > 0)
                {
                        s = pl.getSong(--pos);
                        if (!s || s->getAlbum() != album)
                                break;
                }
                pl.highlight(pos);
        }
}

bool ScrollDownArtist::canBeRun() const
{
        return proxySongList(myScreen);
}

void ScrollDownArtist::run()
{
        auto pl = proxySongList(myScreen);
        assert(pl);
        size_t pos = pl.choice();
        if (MPD::Song *s = pl.getSong(pos))
        {
                std::string artist = s->getArtist();
                while (pos < pl.size() - 1)
                {
                        s = pl.getSong(++pos);
                        if (!s || s->getArtist() != artist)
                                break;
                }
                pl.highlight(pos);
        }
}

bool ScrollDownAlbum::canBeRun() const
{
        return proxySongList(myScreen);
}

void ScrollDownAlbum::run()
{
        auto pl = proxySongList(myScreen);
        assert(pl);
        size_t pos = pl.choice();
        if (MPD::Song *s = pl.getSong(pos))
        {
                std::string album = s->getAlbum();
                while (pos < pl.size() - 1)
                {
                        s = pl.getSong(++pos);
                        if (!s || s->getAlbum() != album)
                                break;
                }
                pl.highlight(pos);
        }
}

void PageUp::run()
{
        myScreen->scroll(NC::Scroll::PageUp);
        listsChangeFinisher();
}

void PageDown::run()
{
        myScreen->scroll(NC::Scroll::PageDown);
        listsChangeFinisher();
}

void MoveHome::run()
{
        myScreen->scroll(NC::Scroll::Home);
        listsChangeFinisher();
}

void MoveEnd::run()
{
        myScreen->scroll(NC::Scroll::End);
        listsChangeFinisher();
}

void ToggleInterface::run()
{
        switch (Config.design)
        {
                case Design::Classic:
                        Config.design = Design::Alternative;
                        Config.statusbar_visibility = false;
                        break;
                case Design::Alternative:
                        Config.design = Design::Classic;
                        Config.statusbar_visibility = OriginalStatusbarVisibility;
                        break;
        }
        setWindowsDimensions();
        Progressbar::unlock();
        Statusbar::unlock();
        resizeScreen(false);
        Status::Changes::mixer();
        Status::Changes::elapsedTime(false);
        Statusbar::printf("User interface: %1%", Config.design);
}

bool JumpToParentDirectory::canBeRun() const
{
        return (myScreen == myBrowser)
#       ifdef HAVE_TAGLIB_H
            || (myScreen->activeWindow() == myTagEditor->Dirs)
#       endif // HAVE_TAGLIB_H
        ;
}

void JumpToParentDirectory::run()
{
        if (myScreen == myBrowser)
        {
                if (myBrowser->CurrentDir() != "/")
                {
                        myBrowser->main().reset();
                        myBrowser->enterPressed();
                }
        }
#       ifdef HAVE_TAGLIB_H
        else if (myScreen == myTagEditor)
        {
                if (myTagEditor->CurrentDir() != "/")
                {
                        myTagEditor->Dirs->reset();
                        myTagEditor->enterPressed();
                }
        }
#       endif // HAVE_TAGLIB_H
}

void PressEnter::run()
{
        myScreen->enterPressed();
}

void PressSpace::run()
{
        myScreen->spacePressed();
}

bool PreviousColumn::canBeRun() const
{
        auto hc = hasColumns(myScreen);
        return hc && hc->previousColumnAvailable();
}

void PreviousColumn::run()
{
        hasColumns(myScreen)->previousColumn();
}

bool NextColumn::canBeRun() const
{
        auto hc = hasColumns(myScreen);
        return hc && hc->nextColumnAvailable();
}

void NextColumn::run()
{
        hasColumns(myScreen)->nextColumn();
}

bool MasterScreen::canBeRun() const
{
        using Global::myLockedScreen;
        using Global::myInactiveScreen;
        
        return myLockedScreen
            && myInactiveScreen
            && myLockedScreen != myScreen
            && myScreen->isMergable();
}

void MasterScreen::run()
{
        using Global::myInactiveScreen;
        using Global::myLockedScreen;
        
        myInactiveScreen = myScreen;
        myScreen = myLockedScreen;
        drawHeader();
}

bool SlaveScreen::canBeRun() const
{
        using Global::myLockedScreen;
        using Global::myInactiveScreen;
        
        return myLockedScreen
            && myInactiveScreen
            && myLockedScreen == myScreen
            && myScreen->isMergable();
}

void SlaveScreen::run()
{
        using Global::myInactiveScreen;
        using Global::myLockedScreen;
        
        myScreen = myInactiveScreen;
        myInactiveScreen = myLockedScreen;
        drawHeader();
}

void VolumeUp::run()
{
        int volume = std::min(Status::State::volume()+Config.volume_change_step, 100u);
        Mpd.SetVolume(volume);
}

void VolumeDown::run()
{
        int volume = std::max(int(Status::State::volume()-Config.volume_change_step), 0);
        Mpd.SetVolume(volume);
}

bool DeletePlaylistItems::canBeRun() const
{
        return (myScreen == myPlaylist && !myPlaylist->main().empty())
            || (myScreen->isActiveWindow(myPlaylistEditor->Content) && !myPlaylistEditor->Content.empty());
}

void DeletePlaylistItems::run()
{
        if (myScreen == myPlaylist)
        {
                Statusbar::print("Deleting items...");
                auto delete_fun = boost::bind(&MPD::Connection::Delete, _1, _2);
                deleteSelectedSongs(myPlaylist->main(), delete_fun);
                Statusbar::print("Item(s) deleted");
        }
        else if (myScreen->isActiveWindow(myPlaylistEditor->Content))
        {
                std::string playlist = myPlaylistEditor->Playlists.current().value();
                auto delete_fun = boost::bind(&MPD::Connection::PlaylistDelete, _1, playlist, _2);
                Statusbar::print("Deleting items...");
                deleteSelectedSongs(myPlaylistEditor->Content, delete_fun);
                Statusbar::print("Item(s) deleted");
        }
}

bool DeleteBrowserItems::canBeRun() const
{
        auto check_if_deletion_allowed = []() {
                if (Config.allow_for_physical_item_deletion)
                        return true;
                else
                {
                        Statusbar::print("Flag \"allow_for_physical_item_deletion\" needs to be enabled in configuration file");
                        return false;
                }
        };
        return myScreen == myBrowser
            && !myBrowser->main().empty()
            && isMPDMusicDirSet()
            && check_if_deletion_allowed();
}

void DeleteBrowserItems::run()
{
        boost::format question;
        if (hasSelected(myBrowser->main().begin(), myBrowser->main().end()))
                question = boost::format("Delete selected items?");
        else
        {
                MPD::Item &item = myBrowser->main().current().value();
                std::string iname = item.type == MPD::itSong ? item.song->getName() : item.name;
                question = boost::format("Delete %1% \"%2%\"?")
                        % itemTypeToString(item.type) % wideShorten(iname, COLS-question.size()-10);
        }
        bool yes = askYesNoQuestion(question, Status::trace);
        if (yes)
        {
                bool success = true;
                auto list = getSelectedOrCurrent(myBrowser->main().begin(), myBrowser->main().end(), myBrowser->main().currentI());
                for (auto it = list.begin(); it != list.end(); ++it)
                {
                        const MPD::Item &i = (*it)->value();
                        std::string iname = i.type == MPD::itSong ? i.song->getName() : i.name;
                        std::string errmsg;
                        if (myBrowser->deleteItem(i, errmsg))
                        {
                                const char msg[] = "\"%1%\" deleted";
                                Statusbar::printf(msg, wideShorten(iname, COLS-const_strlen(msg)));
                        }
                        else
                        {
                                Statusbar::print(errmsg);
                                success = false;
                                break;
                        }
                }
                if (success)
                {
                        if (myBrowser->isLocal())
                                myBrowser->GetDirectory(myBrowser->CurrentDir());
                        else
                                Mpd.UpdateDirectory(myBrowser->CurrentDir());
                }
        }
        else
                Statusbar::print("Aborted");
}

bool DeleteStoredPlaylist::canBeRun() const
{
        return myScreen->isActiveWindow(myPlaylistEditor->Playlists)
            && myPlaylistEditor->Playlists.empty();
}

void DeleteStoredPlaylist::run()
{
        boost::format question;
        if (hasSelected(myPlaylistEditor->Playlists.begin(), myPlaylistEditor->Playlists.end()))
                question = boost::format("Delete selected playlists?");
        else
                question = boost::format("Delete playlist \"%1%\"?")
                        % wideShorten(myPlaylistEditor->Playlists.current().value(), COLS-question.size()-10);
        bool yes = askYesNoQuestion(question, Status::trace);
        if (yes)
        {
                auto list = getSelectedOrCurrent(myPlaylistEditor->Playlists.begin(), myPlaylistEditor->Playlists.end(), myPlaylistEditor->Playlists.currentI());
                Mpd.StartCommandsList();
                for (auto it = list.begin(); it != list.end(); ++it)
                        Mpd.DeletePlaylist((*it)->value());
                Mpd.CommitCommandsList();
                Statusbar::printf("%1% deleted", list.size() == 1 ? "Playlist" : "Playlists");
        }
        else
                Statusbar::print("Aborted");
}

void ReplaySong::run()
{
        if (Status::State::player() != MPD::psStop)
                Mpd.Seek(myPlaylist->currentSongPosition(), 0);
}

void PreviousSong::run()
{
        Mpd.Prev();
}

void NextSong::run()
{
        Mpd.Next();
}

void Pause::run()
{
        Mpd.Toggle();
}

void SavePlaylist::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << "Save playlist as: ";
        std::string playlist_name = wFooter->getString();
        Statusbar::unlock();
        if (playlist_name.find("/") != std::string::npos)
        {
                Statusbar::print("Playlist name must not contain slashes");
                return;
        }
        if (!playlist_name.empty())
        {
                if (myPlaylist->main().isFiltered())
                {
                        Mpd.StartCommandsList();
                        for (size_t i = 0; i < myPlaylist->main().size(); ++i)
                                Mpd.AddToPlaylist(playlist_name, myPlaylist->main()[i].value());
                        Mpd.CommitCommandsList();
                        Statusbar::printf("Filtered items added to playlist \"%1%\"", playlist_name);
                }
                else
                {
                        try
                        {
                                Mpd.SavePlaylist(playlist_name);
                                Statusbar::printf("Playlist saved as \"%1%\"", playlist_name);
                        }
                        catch (MPD::ServerError &e)
                        {
                                if (e.code() == MPD_SERVER_ERROR_EXIST)
                                {
                                        bool yes = askYesNoQuestion(
                                                boost::format("Playlist \"%1%\" already exists, overwrite?") % playlist_name,
                                                Status::trace
                                        );
                                        if (yes)
                                        {
                                                Mpd.DeletePlaylist(playlist_name);
                                                Mpd.SavePlaylist(playlist_name);
                                                Statusbar::print("Playlist overwritten");
                                        }
                                        else
                                                Statusbar::print("Aborted");
                                        if (myScreen == myPlaylist)
                                                myPlaylist->EnableHighlighting();
                                }
                                else
                                        throw e;
                        }
                }
        }
        if (!myBrowser->isLocal()
        &&  myBrowser->CurrentDir() == "/"
        &&  !myBrowser->main().empty())
                myBrowser->GetDirectory(myBrowser->CurrentDir());
}

void Stop::run()
{
        Mpd.Stop();
}

void ExecuteCommand::run()
{
        using Global::wFooter;
        Statusbar::lock();
        Statusbar::put() << NC::Format::Bold << ":" << NC::Format::NoBold;
        wFooter->setGetStringHelper(Statusbar::Helpers::TryExecuteImmediateCommand());
        std::string cmd_name = wFooter->getString();
        wFooter->setGetStringHelper(Statusbar::Helpers::getString);
        Statusbar::unlock();
        if (cmd_name.empty())
                return;
        auto cmd = Bindings.findCommand(cmd_name);
        if (cmd)
        {
                Statusbar::printf(1, "Executing %1%...", cmd_name);
                bool res = cmd->binding().execute();
                Statusbar::printf("Execution of command \"%1%\" %2%.",
                        cmd_name, res ? "successful" : "unsuccessful"
                );
        }
        else
                Statusbar::printf("No command named \"%1%\"", cmd_name);
}

bool MoveSortOrderUp::canBeRun() const
{
        return myScreen == mySortPlaylistDialog;
}

void MoveSortOrderUp::run()
{
        mySortPlaylistDialog->moveSortOrderUp();
}

bool MoveSortOrderDown::canBeRun() const
{
        return myScreen == mySortPlaylistDialog;
}

void MoveSortOrderDown::run()
{
        mySortPlaylistDialog->moveSortOrderDown();
}

bool MoveSelectedItemsUp::canBeRun() const
{
        return ((myScreen == myPlaylist
            &&  !myPlaylist->main().empty()
            &&  !myPlaylist->isFiltered())
         ||    (myScreen->isActiveWindow(myPlaylistEditor->Content)
            &&  !myPlaylistEditor->Content.empty()
            &&  !myPlaylistEditor->isContentFiltered()));
}

void MoveSelectedItemsUp::run()
{
        if (myScreen == myPlaylist)
        {
                moveSelectedItemsUp(myPlaylist->main(), boost::bind(&MPD::Connection::Move, _1, _2, _3));
        }
        else if (myScreen == myPlaylistEditor)
        {
                assert(!myPlaylistEditor->Playlists.empty());
                std::string playlist = myPlaylistEditor->Playlists.current().value();
                auto move_fun = boost::bind(&MPD::Connection::PlaylistMove, _1, playlist, _2, _3);
                moveSelectedItemsUp(myPlaylistEditor->Content, move_fun);
        }
}

bool MoveSelectedItemsDown::canBeRun() const
{
        return ((myScreen == myPlaylist
            &&  !myPlaylist->main().empty()
            &&  !myPlaylist->isFiltered())
         ||    (myScreen->isActiveWindow(myPlaylistEditor->Content)
            &&  !myPlaylistEditor->Content.empty()
            &&  !myPlaylistEditor->isContentFiltered()));
}

void MoveSelectedItemsDown::run()
{
        if (myScreen == myPlaylist)
        {
                moveSelectedItemsDown(myPlaylist->main(), boost::bind(&MPD::Connection::Move, _1, _2, _3));
        }
        else if (myScreen == myPlaylistEditor)
        {
                assert(!myPlaylistEditor->Playlists.empty());
                std::string playlist = myPlaylistEditor->Playlists.current().value();
                auto move_fun = boost::bind(&MPD::Connection::PlaylistMove, _1, playlist, _2, _3);
                moveSelectedItemsDown(myPlaylistEditor->Content, move_fun);
        }
}

bool MoveSelectedItemsTo::canBeRun() const
{
        return myScreen == myPlaylist
            || myScreen->isActiveWindow(myPlaylistEditor->Content);
}

void MoveSelectedItemsTo::run()
{
        if (myScreen == myPlaylist)
                moveSelectedItemsTo(myPlaylist->main(), boost::bind(&MPD::Connection::Move, _1, _2, _3));
        else
        {
                assert(!myPlaylistEditor->Playlists.empty());
                std::string playlist = myPlaylistEditor->Playlists.current().value();
                auto move_fun = boost::bind(&MPD::Connection::PlaylistMove, _1, playlist, _2, _3);
                moveSelectedItemsTo(myPlaylistEditor->Content, move_fun);
        }
}

bool Add::canBeRun() const
{
        return myScreen != myPlaylistEditor
           || !myPlaylistEditor->Playlists.empty();
}

void Add::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << (myScreen == myPlaylistEditor ? "Add to playlist: " : "Add: ");
        std::string path = wFooter->getString();
        Statusbar::unlock();
        if (!path.empty())
        {
                Statusbar::put() << "Adding...";
                wFooter->refresh();
                if (myScreen == myPlaylistEditor)
                        Mpd.AddToPlaylist(myPlaylistEditor->Playlists.current().value(), path);
                else
                {
                        const char lastfm_url[] = "lastfm://";
                        if (path.compare(0, const_strlen(lastfm_url), lastfm_url) == 0
                        ||  path.find(".asx", path.length()-4) != std::string::npos
                        ||  path.find(".cue", path.length()-4) != std::string::npos
                        ||  path.find(".m3u", path.length()-4) != std::string::npos
                        ||  path.find(".pls", path.length()-4) != std::string::npos
                        ||  path.find(".xspf", path.length()-5) != std::string::npos)
                                Mpd.LoadPlaylist(path);
                        else
                                Mpd.Add(path);
                }
        }
}

bool SeekForward::canBeRun() const
{
        return Status::State::player() != MPD::psStop && myPlaylist->currentSongLength() > 0;
}

void SeekForward::run()
{
        seek();
}

bool SeekBackward::canBeRun() const
{
        return Status::State::player() != MPD::psStop && myPlaylist->currentSongLength() > 0;
}

void SeekBackward::run()
{
        seek();
}

bool ToggleDisplayMode::canBeRun() const
{
        return myScreen == myPlaylist
            || myScreen == myBrowser
            || myScreen == mySearcher
            || myScreen->isActiveWindow(myPlaylistEditor->Content);
}

void ToggleDisplayMode::run()
{
        if (myScreen == myPlaylist)
        {
                switch (Config.playlist_display_mode)
                {
                        case DisplayMode::Classic:
                                Config.playlist_display_mode = DisplayMode::Columns;
                                myPlaylist->main().setItemDisplayer(boost::bind(
                                        Display::SongsInColumns, _1, myPlaylist->proxySongList()
                                ));
                                if (Config.titles_visibility)
                                        myPlaylist->main().setTitle(Display::Columns(myPlaylist->main().getWidth()));
                                else
                                        myPlaylist->main().setTitle("");
                                break;
                        case DisplayMode::Columns:
                                Config.playlist_display_mode = DisplayMode::Classic;
                                myPlaylist->main().setItemDisplayer(boost::bind(
                                        Display::Songs, _1, myPlaylist->proxySongList(), Config.song_list_format
                                ));
                                myPlaylist->main().setTitle("");
                }
                Statusbar::printf("Playlist display mode: %1%", Config.playlist_display_mode);
        }
        else if (myScreen == myBrowser)
        {
                switch (Config.browser_display_mode)
                {
                        case DisplayMode::Classic:
                                Config.browser_display_mode = DisplayMode::Columns;
                                if (Config.titles_visibility)
                                        myBrowser->main().setTitle(Display::Columns(myBrowser->main().getWidth()));
                                else
                                        myBrowser->main().setTitle("");
                                break;
                        case DisplayMode::Columns:
                                Config.browser_display_mode = DisplayMode::Classic;
                                myBrowser->main().setTitle("");
                                break;
                }
                Statusbar::printf("Browser display mode: %1%", Config.browser_display_mode);
        }
        else if (myScreen == mySearcher)
        {
                switch (Config.search_engine_display_mode)
                {
                        case DisplayMode::Classic:
                                Config.search_engine_display_mode = DisplayMode::Columns;
                                break;
                        case DisplayMode::Columns:
                                Config.search_engine_display_mode = DisplayMode::Classic;
                                break;
                }
                Statusbar::printf("Search engine display mode: %1%", Config.search_engine_display_mode);
                if (mySearcher->main().size() > SearchEngine::StaticOptions)
                        mySearcher->main().setTitle(
                                   Config.search_engine_display_mode == DisplayMode::Columns
                                && Config.titles_visibility
                                ? Display::Columns(mySearcher->main().getWidth())
                                : ""
                        );
        }
        else if (myScreen->isActiveWindow(myPlaylistEditor->Content))
        {
                switch (Config.playlist_editor_display_mode)
                {
                        case DisplayMode::Classic:
                                Config.playlist_editor_display_mode = DisplayMode::Columns;
                                myPlaylistEditor->Content.setItemDisplayer(boost::bind(
                                        Display::SongsInColumns, _1, myPlaylistEditor->contentProxyList()
                                ));
                                break;
                        case DisplayMode::Columns:
                                Config.playlist_editor_display_mode = DisplayMode::Classic;
                                myPlaylistEditor->Content.setItemDisplayer(boost::bind(
                                        Display::Songs, _1, myPlaylistEditor->contentProxyList(), Config.song_list_format
                                ));
                                break;
                }
                Statusbar::printf("Playlist editor display mode: %1%", Config.playlist_editor_display_mode);
        }
}

bool ToggleSeparatorsBetweenAlbums::canBeRun() const
{
        return true;
}

void ToggleSeparatorsBetweenAlbums::run()
{
        Config.playlist_separate_albums = !Config.playlist_separate_albums;
        Statusbar::printf("Separators between albums: %1%",
                Config.playlist_separate_albums ? "on" : "off"
        );
}

#ifndef HAVE_CURL_CURL_H
bool ToggleLyricsFetcher::canBeRun() const
{
        return false;
}
#endif // NOT HAVE_CURL_CURL_H

void ToggleLyricsFetcher::run()
{
#       ifdef HAVE_CURL_CURL_H
        myLyrics->ToggleFetcher();
#       endif // HAVE_CURL_CURL_H
}

#ifndef HAVE_CURL_CURL_H
bool ToggleFetchingLyricsInBackground::canBeRun() const
{
        return false;
}
#endif // NOT HAVE_CURL_CURL_H

void ToggleFetchingLyricsInBackground::run()
{
#       ifdef HAVE_CURL_CURL_H
        Config.fetch_lyrics_in_background = !Config.fetch_lyrics_in_background;
        Statusbar::printf("Fetching lyrics for playing songs in background: %1%",
                Config.fetch_lyrics_in_background ? "on" : "off"
        );
#       endif // HAVE_CURL_CURL_H
}

void TogglePlayingSongCentering::run()
{
        Config.autocenter_mode = !Config.autocenter_mode;
        Statusbar::printf("Centering playing song: %1%",
                Config.autocenter_mode ? "on" : "off"
        );
        if (Config.autocenter_mode
        && Status::State::player() != MPD::psStop
        && !myPlaylist->main().isFiltered())
                myPlaylist->main().highlight(myPlaylist->currentSongPosition());
}

void UpdateDatabase::run()
{
        if (myScreen == myBrowser)
                Mpd.UpdateDirectory(myBrowser->CurrentDir());
#       ifdef HAVE_TAGLIB_H
        else if (myScreen == myTagEditor)
                Mpd.UpdateDirectory(myTagEditor->CurrentDir());
#       endif // HAVE_TAGLIB_H
        else
                Mpd.UpdateDirectory("/");
}

bool JumpToPlayingSong::canBeRun() const
{
        return ((myScreen == myPlaylist && !myPlaylist->isFiltered())
            ||  myScreen == myBrowser
            ||  myScreen == myLibrary)
          &&   Status::State::player() != MPD::psStop;
}

void JumpToPlayingSong::run()
{
        if (myScreen == myPlaylist)
                myPlaylist->main().highlight(myPlaylist->currentSongPosition());
        else if (myScreen == myBrowser)
        {
                myBrowser->LocateSong(myPlaylist->nowPlayingSong());
                drawHeader();
        }
        else if (myScreen == myLibrary)
        {
                myLibrary->LocateSong(myPlaylist->nowPlayingSong());
        }
}

void ToggleRepeat::run()
{
        Mpd.SetRepeat(!Status::State::repeat());
}

void Shuffle::run()
{
        Mpd.Shuffle();
}

void ToggleRandom::run()
{
        Mpd.SetRandom(!Status::State::random());
}

bool StartSearching::canBeRun() const
{
        return myScreen == mySearcher && !mySearcher->main()[0].isInactive();
}

void StartSearching::run()
{
        mySearcher->main().highlight(SearchEngine::SearchButton);
        mySearcher->main().setHighlighting(0);
        mySearcher->main().refresh();
        mySearcher->main().setHighlighting(1);
        mySearcher->enterPressed();
}

bool SaveTagChanges::canBeRun() const
{
#       ifdef HAVE_TAGLIB_H
        return myScreen == myTinyTagEditor
            || myScreen->activeWindow() == myTagEditor->TagTypes;
#       else
        return false;
#       endif // HAVE_TAGLIB_H
}

void SaveTagChanges::run()
{
#       ifdef HAVE_TAGLIB_H
        if (myScreen == myTinyTagEditor)
        {
                myTinyTagEditor->main().highlight(myTinyTagEditor->main().size()-2); // Save
                myTinyTagEditor->enterPressed();
        }
        else if (myScreen->activeWindow() == myTagEditor->TagTypes)
        {
                myTagEditor->TagTypes->highlight(myTagEditor->TagTypes->size()-1); // Save
                myTagEditor->enterPressed();
        }
#       endif // HAVE_TAGLIB_H
}

void ToggleSingle::run()
{
        Mpd.SetSingle(!Status::State::single());
}

void ToggleConsume::run()
{
        Mpd.SetConsume(!Status::State::consume());
}

void ToggleCrossfade::run()
{
        Mpd.SetCrossfade(Status::State::crossfade() ? 0 : Config.crossfade_time);
}

void SetCrossfade::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << "Set crossfade to: ";
        std::string crossfade = wFooter->getString();
        Statusbar::unlock();
        int cf = fromString<unsigned>(crossfade);
        lowerBoundCheck(cf, 1);
        Config.crossfade_time = cf;
        Mpd.SetCrossfade(cf);
}

void SetVolume::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << "Set volume to: ";
        std::string strvolume = wFooter->getString();
        Statusbar::unlock();
        int volume = fromString<unsigned>(strvolume);
        boundsCheck(volume, 0, 100);
        Mpd.SetVolume(volume);
        Statusbar::printf("Volume set to %1%%%", volume);
}

bool EditSong::canBeRun() const
{
#       ifdef HAVE_TAGLIB_H
        return currentSong(myScreen)
            && isMPDMusicDirSet();
#       else
        return false;
#       endif // HAVE_TAGLIB_H
}

void EditSong::run()
{
#       ifdef HAVE_TAGLIB_H
        auto s = currentSong(myScreen);
        myTinyTagEditor->SetEdited(*s);
        myTinyTagEditor->switchTo();
#       endif // HAVE_TAGLIB_H
}

bool EditLibraryTag::canBeRun() const
{
#       ifdef HAVE_TAGLIB_H
        return myScreen->isActiveWindow(myLibrary->Tags)
            && !myLibrary->Tags.empty()
            && isMPDMusicDirSet();
#       else
        return false;
#       endif // HAVE_TAGLIB_H
}

void EditLibraryTag::run()
{
#       ifdef HAVE_TAGLIB_H
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << NC::Format::Bold << tagTypeToString(Config.media_lib_primary_tag) << NC::Format::NoBold << ": ";
        std::string new_tag = wFooter->getString(myLibrary->Tags.current().value().tag());
        Statusbar::unlock();
        if (!new_tag.empty() && new_tag != myLibrary->Tags.current().value().tag())
        {
                Statusbar::print("Updating tags...");
                Mpd.StartSearch(1);
                Mpd.AddSearch(Config.media_lib_primary_tag, myLibrary->Tags.current().value().tag());
                MPD::MutableSong::SetFunction set = tagTypeToSetFunction(Config.media_lib_primary_tag);
                assert(set);
                bool success = true;
                std::string dir_to_update;
                Mpd.CommitSearchSongs([set, &dir_to_update, &new_tag, &success](MPD::Song s) {
                        if (!success)
                                return;
                        MPD::MutableSong ms = s;
                        ms.setTags(set, new_tag, Config.tags_separator);
                        Statusbar::printf("Updating tags in \"%1%\"...", ms.getName());
                        std::string path = Config.mpd_music_dir + ms.getURI();
                        if (!Tags::write(ms))
                        {
                                const char msg[] = "Error while updating tags in \"%1%\"";
                                Statusbar::printf(msg, wideShorten(ms.getURI(), COLS-const_strlen(msg)));
                                success = false;
                        }
                        if (dir_to_update.empty())
                                dir_to_update = s.getURI();
                        else
                                dir_to_update = getSharedDirectory(dir_to_update, s.getURI());
                });
                if (success)
                {
                        Mpd.UpdateDirectory(dir_to_update);
                        Statusbar::print("Tags updated successfully");
                }
        }
#       endif // HAVE_TAGLIB_H
}

bool EditLibraryAlbum::canBeRun() const
{
#       ifdef HAVE_TAGLIB_H
        return myScreen->isActiveWindow(myLibrary->Albums)
            && !myLibrary->Albums.empty()
                && isMPDMusicDirSet();
#       else
        return false;
#       endif // HAVE_TAGLIB_H
}

void EditLibraryAlbum::run()
{
#       ifdef HAVE_TAGLIB_H
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << NC::Format::Bold << "Album: " << NC::Format::NoBold;
        std::string new_album = wFooter->getString(myLibrary->Albums.current().value().entry().album());
        Statusbar::unlock();
        if (!new_album.empty() && new_album != myLibrary->Albums.current().value().entry().album())
        {
                bool success = 1;
                Statusbar::print("Updating tags...");
                for (size_t i = 0;  i < myLibrary->Songs.size(); ++i)
                {
                        Statusbar::printf("Updating tags in \"%1%\"...", myLibrary->Songs[i].value().getName());
                        std::string path = Config.mpd_music_dir + myLibrary->Songs[i].value().getURI();
                        TagLib::FileRef f(path.c_str());
                        if (f.isNull())
                        {
                                const char msg[] = "Error while opening file \"%1%\"";
                                Statusbar::printf(msg, wideShorten(myLibrary->Songs[i].value().getURI(), COLS-const_strlen(msg)));
                                success = 0;
                                break;
                        }
                        f.tag()->setAlbum(ToWString(new_album));
                        if (!f.save())
                        {
                                const char msg[] = "Error while writing tags in \"%1%\"";
                                Statusbar::printf(msg, wideShorten(myLibrary->Songs[i].value().getURI(), COLS-const_strlen(msg)));
                                success = 0;
                                break;
                        }
                }
                if (success)
                {
                        Mpd.UpdateDirectory(getSharedDirectory(myLibrary->Songs.beginV(), myLibrary->Songs.endV()));
                        Statusbar::print("Tags updated successfully");
                }
        }
#       endif // HAVE_TAGLIB_H
}

bool EditDirectoryName::canBeRun() const
{
        return  ((myScreen == myBrowser
              && !myBrowser->main().empty()
              && myBrowser->main().current().value().type == MPD::itDirectory)
#       ifdef HAVE_TAGLIB_H
            ||   (myScreen->activeWindow() == myTagEditor->Dirs
              && !myTagEditor->Dirs->empty()
              && myTagEditor->Dirs->choice() > 0)
#       endif // HAVE_TAGLIB_H
        ) &&     isMPDMusicDirSet();
}

void EditDirectoryName::run()
{
        using Global::wFooter;
        
        if (myScreen == myBrowser)
        {
                std::string old_dir = myBrowser->main().current().value().name;
                Statusbar::lock();
                Statusbar::put() << NC::Format::Bold << "Directory: " << NC::Format::NoBold;
                std::string new_dir = wFooter->getString(old_dir);
                Statusbar::unlock();
                if (!new_dir.empty() && new_dir != old_dir)
                {
                        std::string full_old_dir;
                        if (!myBrowser->isLocal())
                                full_old_dir += Config.mpd_music_dir;
                        full_old_dir += old_dir;
                        std::string full_new_dir;
                        if (!myBrowser->isLocal())
                                full_new_dir += Config.mpd_music_dir;
                        full_new_dir += new_dir;
                        int rename_result = rename(full_old_dir.c_str(), full_new_dir.c_str());
                        if (rename_result == 0)
                        {
                                const char msg[] = "Directory renamed to \"%1%\"";
                                Statusbar::printf(msg, wideShorten(new_dir, COLS-const_strlen(msg)));
                                if (!myBrowser->isLocal())
                                        Mpd.UpdateDirectory(getSharedDirectory(old_dir, new_dir));
                                myBrowser->GetDirectory(myBrowser->CurrentDir());
                        }
                        else
                        {
                                const char msg[] = "Couldn't rename \"%1%\": %s";
                                Statusbar::printf(msg, wideShorten(old_dir, COLS-const_strlen(msg)-25), strerror(errno));
                        }
                }
        }
#       ifdef HAVE_TAGLIB_H
        else if (myScreen->activeWindow() == myTagEditor->Dirs)
        {
                std::string old_dir = myTagEditor->Dirs->current().value().first;
                Statusbar::lock();
                Statusbar::put() << NC::Format::Bold << "Directory: " << NC::Format::NoBold;
                std::string new_dir = wFooter->getString(old_dir);
                Statusbar::unlock();
                if (!new_dir.empty() && new_dir != old_dir)
                {
                        std::string full_old_dir = Config.mpd_music_dir + myTagEditor->CurrentDir() + "/" + old_dir;
                        std::string full_new_dir = Config.mpd_music_dir + myTagEditor->CurrentDir() + "/" + new_dir;
                        if (rename(full_old_dir.c_str(), full_new_dir.c_str()) == 0)
                        {
                                const char msg[] = "Directory renamed to \"%1%\"";
                                Statusbar::printf(msg, wideShorten(new_dir, COLS-const_strlen(msg)));
                                Mpd.UpdateDirectory(myTagEditor->CurrentDir());
                        }
                        else
                        {
                                const char msg[] = "Couldn't rename \"%1%\": %2%";
                                Statusbar::printf(msg, wideShorten(old_dir, COLS-const_strlen(msg)-25), strerror(errno));
                        }
                }
        }
#       endif // HAVE_TAGLIB_H
}

bool EditPlaylistName::canBeRun() const
{
        return   (myScreen->isActiveWindow(myPlaylistEditor->Playlists)
              && !myPlaylistEditor->Playlists.empty())
            ||   (myScreen == myBrowser
              && !myBrowser->main().empty()
                  && myBrowser->main().current().value().type == MPD::itPlaylist);
}

void EditPlaylistName::run()
{
        using Global::wFooter;
        
        std::string old_name;
        if (myScreen->isActiveWindow(myPlaylistEditor->Playlists))
                old_name = myPlaylistEditor->Playlists.current().value();
        else
                old_name = myBrowser->main().current().value().name;
        Statusbar::lock();
        Statusbar::put() << NC::Format::Bold << "Playlist: " << NC::Format::NoBold;
        std::string new_name = wFooter->getString(old_name);
        Statusbar::unlock();
        if (!new_name.empty() && new_name != old_name)
        {
                Mpd.Rename(old_name, new_name);
                const char msg[] = "Playlist renamed to \"%1%\"";
                Statusbar::printf(msg, wideShorten(new_name, COLS-const_strlen(msg)));
                if (!myBrowser->isLocal())
                        myBrowser->GetDirectory("/");
        }
}

bool EditLyrics::canBeRun() const
{
        return myScreen == myLyrics;
}

void EditLyrics::run()
{
        myLyrics->Edit();
}

bool JumpToBrowser::canBeRun() const
{
        return currentSong(myScreen);
}

void JumpToBrowser::run()
{
        auto s = currentSong(myScreen);
        myBrowser->LocateSong(*s);
}

bool JumpToMediaLibrary::canBeRun() const
{
        return currentSong(myScreen);
}

void JumpToMediaLibrary::run()
{
        auto s = currentSong(myScreen);
        myLibrary->LocateSong(*s);
}

bool JumpToPlaylistEditor::canBeRun() const
{
        return myScreen == myBrowser
            && myBrowser->main().current().value().type == MPD::itPlaylist;
}

void JumpToPlaylistEditor::run()
{
        myPlaylistEditor->Locate(myBrowser->main().current().value().name);
}

void ToggleScreenLock::run()
{
        using Global::wFooter;
        using Global::myLockedScreen;
        
        if (myLockedScreen != 0)
        {
                BaseScreen::unlock();
                Actions::setResizeFlags();
                myScreen->resize();
                Statusbar::print("Screen unlocked");
        }
        else
        {
                int part = Config.locked_screen_width_part*100;
                if (Config.ask_for_locked_screen_width_part)
                {
                        Statusbar::lock();
                        Statusbar::put() << "% of the locked screen's width to be reserved (20-80): ";
                        std::string strpart = wFooter->getString(boost::lexical_cast<std::string>(part));
                        Statusbar::unlock();
                        part = fromString<unsigned>(strpart);
                }
                boundsCheck(part, 20, 80);
                Config.locked_screen_width_part = part/100.0;
                if (myScreen->lock())
                        Statusbar::printf("Screen locked (with %1%%% width)", part);
                else
                        Statusbar::print("Current screen can't be locked");
        }
}

bool JumpToTagEditor::canBeRun() const
{
#       ifdef HAVE_TAGLIB_H
        return currentSong(myScreen)
            && isMPDMusicDirSet();
#       else
        return false;
#       endif // HAVE_TAGLIB_H
}

void JumpToTagEditor::run()
{
#       ifdef HAVE_TAGLIB_H
        auto s = currentSong(myScreen);
        myTagEditor->LocateSong(*s);
#       endif // HAVE_TAGLIB_H
}

bool JumpToPositionInSong::canBeRun() const
{
        return Status::State::player() != MPD::psStop && myPlaylist->currentSongLength() > 0;
}

void JumpToPositionInSong::run()
{
        using Global::wFooter;
        
        const MPD::Song s = myPlaylist->nowPlayingSong();
        
        Statusbar::lock();
        Statusbar::put() << "Position to go (in %/m:ss/seconds(s)): ";
        std::string strpos = wFooter->getString();
        Statusbar::unlock();
        
        boost::regex rx;
        boost::smatch what;
        
        if (boost::regex_match(strpos, what, rx.assign("([0-9]+):([0-9]{2})"))) // mm:ss
        {
                int mins = fromString<int>(what[1]);
                int secs = fromString<int>(what[2]);
                boundsCheck(secs, 0, 60);
                Mpd.Seek(s.getPosition(), mins * 60 + secs);
        }
        else if (boost::regex_match(strpos, what, rx.assign("([0-9]+)s"))) // position in seconds
        {
                int secs = fromString<int>(what[1]);
                Mpd.Seek(s.getPosition(), secs);
        }
        else if (boost::regex_match(strpos, what, rx.assign("([0-9]+)[%]{0,1}"))) // position in %
        {
                int percent = fromString<int>(what[1]);
                boundsCheck(percent, 0, 100);
                int secs = (percent * s.getDuration()) / 100.0;
                Mpd.Seek(s.getPosition(), secs);
        }
        else
                Statusbar::print("Invalid format ([m]:[ss], [s]s, [%]%, [%] accepted)");
}

bool ReverseSelection::canBeRun() const
{
        auto w = hasSongs(myScreen);
        return w && w->allowsSelection();
}

void ReverseSelection::run()
{
        auto w = hasSongs(myScreen);
        w->reverseSelection();
        Statusbar::print("Selection reversed");
}

bool RemoveSelection::canBeRun() const
{
        return proxySongList(myScreen);
}

void RemoveSelection::run()
{
        auto pl = proxySongList(myScreen);
        for (size_t i = 0; i < pl.size(); ++i)
                pl.setSelected(i, false);
        Statusbar::print("Selection removed");
}

bool SelectAlbum::canBeRun() const
{
        auto w = hasSongs(myScreen);
        return w && w->allowsSelection() && w->proxySongList();
}

void SelectAlbum::run()
{
        auto pl = proxySongList(myScreen);
        size_t pos = pl.choice();
        if (MPD::Song *s = pl.getSong(pos))
        {
                std::string album = s->getAlbum();
                // select song under cursor
                pl.setSelected(pos, true);
                // go up
                while (pos > 0)
                {
                        s = pl.getSong(--pos);
                        if (!s || s->getAlbum() != album)
                                break;
                        else
                                pl.setSelected(pos, true);
                }
                // go down
                pos = pl.choice();
                while (pos < pl.size() - 1)
                {
                        s = pl.getSong(++pos);
                        if (!s || s->getAlbum() != album)
                                break;
                        else
                                pl.setSelected(pos, true);
                }
                Statusbar::print("Album around cursor position selected");
        }
}

bool AddSelectedItems::canBeRun() const
{
        return myScreen != mySelectedItemsAdder;
}

void AddSelectedItems::run()
{
        mySelectedItemsAdder->switchTo();
}

void CropMainPlaylist::run()
{
        bool yes = true;
        if (Config.ask_before_clearing_playlists)
                yes = askYesNoQuestion("Do you really want to crop main playlist?", Status::trace);
        if (yes)
        {
                Statusbar::print("Cropping playlist...");
                cropPlaylist(myPlaylist->main(), boost::bind(&MPD::Connection::Delete, _1, _2));
        }
}

bool CropPlaylist::canBeRun() const
{
        return myScreen == myPlaylistEditor;
}

void CropPlaylist::run()
{
        assert(!myPlaylistEditor->Playlists.empty());
        std::string playlist = myPlaylistEditor->Playlists.current().value();
        bool yes = true;
        if (Config.ask_before_clearing_playlists)
                yes = askYesNoQuestion(
                        boost::format("Do you really want to crop playlist \"%1%\"?") % playlist,
                        Status::trace
                );
        if (yes)
        {
                auto delete_fun = boost::bind(&MPD::Connection::PlaylistDelete, _1, playlist, _2);
                Statusbar::printf("Cropping playlist \"%1%\"...", playlist);
                cropPlaylist(myPlaylistEditor->Content, delete_fun);
                Statusbar::printf("Playlist \"%1%\" cropped", playlist);
        }
}

void ClearMainPlaylist::run()
{
        bool yes = true;
        if (Config.ask_before_clearing_playlists)
                yes = askYesNoQuestion("Do you really want to clear main playlist?", Status::trace);
        if (yes)
        {
                auto delete_fun = boost::bind(&MPD::Connection::Delete, _1, _2);
                auto clear_fun = boost::bind(&MPD::Connection::ClearMainPlaylist, _1);
                Statusbar::printf("Deleting items...");
                clearPlaylist(myPlaylist->main(), delete_fun, clear_fun);
                Statusbar::printf("Items deleted");
                myPlaylist->main().reset();
        }
}

bool ClearPlaylist::canBeRun() const
{
        return myScreen == myPlaylistEditor;
}

void ClearPlaylist::run()
{
        assert(!myPlaylistEditor->Playlists.empty());
        std::string playlist = myPlaylistEditor->Playlists.current().value();
        bool yes = true;
        if (Config.ask_before_clearing_playlists)
                yes = askYesNoQuestion(
                        boost::format("Do you really want to clear playlist \"%1%\"?") % playlist,
                        Status::trace
                );
        if (yes)
        {
                auto delete_fun = boost::bind(&MPD::Connection::PlaylistDelete, _1, playlist, _2);
                auto clear_fun = boost::bind(&MPD::Connection::ClearPlaylist, _1, playlist);
                Statusbar::printf("Deleting items from \"%1%\"...", playlist);
                clearPlaylist(myPlaylistEditor->Content, delete_fun, clear_fun);
                Statusbar::printf("Items deleted from \"%1%\"", playlist);
        }
}

bool SortPlaylist::canBeRun() const
{
        return myScreen == myPlaylist;
}

void SortPlaylist::run()
{
        mySortPlaylistDialog->switchTo();
}

bool ReversePlaylist::canBeRun() const
{
        return myScreen == myPlaylist;
}

void ReversePlaylist::run()
{
        myPlaylist->Reverse();
}

bool ApplyFilter::canBeRun() const
{
        auto w = dynamic_cast<Filterable *>(myScreen);
        return w && w->allowsFiltering();
}

void ApplyFilter::run()
{
        using Global::wFooter;
        
        Filterable *f = dynamic_cast<Filterable *>(myScreen);
        std::string filter = f->currentFilter();
        // if filter is already here, apply it
        if (!filter.empty())
        {
                f->applyFilter(filter);
                myScreen->refreshWindow();
        }

        Statusbar::lock();
        Statusbar::put() << NC::Format::Bold << "Apply filter: " << NC::Format::NoBold;
        wFooter->setGetStringHelper(Statusbar::Helpers::ApplyFilterImmediately(f, filter));
        wFooter->getString(filter);
        wFooter->setGetStringHelper(Statusbar::Helpers::getString);
        Statusbar::unlock();
        
        filter = f->currentFilter();
        if (filter.empty())
        {
                myPlaylist->main().clearFilterResults();
                Statusbar::printf("Filtering disabled");
        }
        else
        {
                // apply filter here so even if old one wasn't modified
                // (and callback wasn't invoked), it still gets applied.
                f->applyFilter(filter);
                Statusbar::printf("Using filter \"%1%\"", filter);
        }
        
        if (myScreen == myPlaylist)
        {
                myPlaylist->EnableHighlighting();
                myPlaylist->reloadTotalLength();
                drawHeader();
        }
        listsChangeFinisher();
}

bool Find::canBeRun() const
{
        return myScreen == myHelp
            || myScreen == myLyrics
#       ifdef HAVE_CURL_CURL_H
            || myScreen == myLastfm
#       endif // HAVE_CURL_CURL_H
        ;
}

void Find::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << "Find: ";
        std::string findme = wFooter->getString();
        Statusbar::unlock();
        
        Statusbar::print("Searching...");
        auto s = static_cast<Screen<NC::Scrollpad> *>(myScreen);
        s->main().removeProperties();
        if (findme.empty() || s->main().setProperties(NC::Format::Reverse, findme, NC::Format::NoReverse))
                Statusbar::print("Done");
        else
                Statusbar::print("No matching patterns found");
        s->main().flush();
}

bool FindItemBackward::canBeRun() const
{
        auto w = dynamic_cast<Searchable *>(myScreen);
        return w && w->allowsSearching();
}

void FindItemForward::run()
{
        findItem(::Find::Forward);
        listsChangeFinisher();
}

bool FindItemForward::canBeRun() const
{
        auto w = dynamic_cast<Searchable *>(myScreen);
        return w && w->allowsSearching();
}

void FindItemBackward::run()
{
        findItem(::Find::Backward);
        listsChangeFinisher();
}

bool NextFoundItem::canBeRun() const
{
        return dynamic_cast<Searchable *>(myScreen);
}

void NextFoundItem::run()
{
        Searchable *w = dynamic_cast<Searchable *>(myScreen);
        w->nextFound(Config.wrapped_search);
        listsChangeFinisher();
}

bool PreviousFoundItem::canBeRun() const
{
        return dynamic_cast<Searchable *>(myScreen);
}

void PreviousFoundItem::run()
{
        Searchable *w = dynamic_cast<Searchable *>(myScreen);
        w->prevFound(Config.wrapped_search);
        listsChangeFinisher();
}

void ToggleFindMode::run()
{
        Config.wrapped_search = !Config.wrapped_search;
        Statusbar::printf("Search mode: %1%",
                Config.wrapped_search ? "Wrapped" : "Normal"
        );
}

void ToggleReplayGainMode::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << "Replay gain mode? [" << NC::Format::Bold << 'o' << NC::Format::NoBold << "ff/" << NC::Format::Bold << 't' << NC::Format::NoBold << "rack/" << NC::Format::Bold << 'a' << NC::Format::NoBold << "lbum]";
        wFooter->refresh();
        int answer = 0;
        do
        {
                Status::trace();
                answer = wFooter->readKey();
        }
        while (answer != 'o' && answer != 't' && answer != 'a');
        Statusbar::unlock();
        Mpd.SetReplayGainMode(answer == 't' ? MPD::rgmTrack : (answer == 'a' ? MPD::rgmAlbum : MPD::rgmOff));
        Statusbar::printf("Replay gain mode: %1%", Mpd.GetReplayGainMode());
}

void ToggleSpaceMode::run()
{
        Config.space_selects = !Config.space_selects;
        Statusbar::printf("Space mode: %1% item", Config.space_selects ? "select" : "add");
}

void ToggleAddMode::run()
{
        std::string mode_desc;
        switch (Config.space_add_mode)
        {
                case SpaceAddMode::AddRemove:
                        Config.space_add_mode = SpaceAddMode::AlwaysAdd;
                        mode_desc = "always add an item to playlist";
                        break;
                case SpaceAddMode::AlwaysAdd:
                        Config.space_add_mode = SpaceAddMode::AddRemove;
                        mode_desc = "add an item to playlist or remove if already added";
                        break;
        }
        Statusbar::printf("Add mode: %1%", mode_desc);
}

void ToggleMouse::run()
{
        Config.mouse_support = !Config.mouse_support;
        mousemask(Config.mouse_support ? ALL_MOUSE_EVENTS : 0, 0);
        Statusbar::printf("Mouse support %1%",
                Config.mouse_support ? "enabled" : "disabled"
        );
}

void ToggleBitrateVisibility::run()
{
        Config.display_bitrate = !Config.display_bitrate;
        Statusbar::printf("Bitrate visibility %1%",
                Config.display_bitrate ? "enabled" : "disabled"
        );
}

void AddRandomItems::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << "Add random? [" << NC::Format::Bold << 's' << NC::Format::NoBold << "ongs/" << NC::Format::Bold << 'a' << NC::Format::NoBold << "rtists/al" << NC::Format::Bold << 'b' << NC::Format::NoBold << "ums] ";
        wFooter->refresh();
        int answer = 0;
        do
        {
                Status::trace();
                answer = wFooter->readKey();
        }
        while (answer != 's' && answer != 'a' && answer != 'b');
        Statusbar::unlock();
        
        mpd_tag_type tag_type = MPD_TAG_ARTIST;
        std::string tag_type_str ;
        if (answer != 's')
        {
                tag_type = charToTagType(answer);
                tag_type_str = boost::locale::to_lower(tagTypeToString(tag_type));
        }
        else
                tag_type_str = "song";
        
        Statusbar::lock();
        Statusbar::put() << "Number of random " << tag_type_str << "s: ";
        std::string strnum = wFooter->getString();
        Statusbar::unlock();
        size_t number = fromString<size_t>(strnum);
        if (number && (answer == 's' ? Mpd.AddRandomSongs(number) : Mpd.AddRandomTag(tag_type, number)))
        {
                Statusbar::printf("%1% random %2%%3% added to playlist",
                        number, tag_type_str, number == 1 ? "" : "s"
                );
        }
}

bool ToggleBrowserSortMode::canBeRun() const
{
        return myScreen == myBrowser;
}

void ToggleBrowserSortMode::run()
{
        switch (Config.browser_sort_mode)
        {
                case SortMode::Name:
                        Config.browser_sort_mode = SortMode::ModificationTime;
                        Statusbar::print("Sort songs by: modification time");
                        break;
                case SortMode::ModificationTime:
                        Config.browser_sort_mode = SortMode::CustomFormat;
                        Statusbar::print("Sort songs by: custom format");
                        break;
                case SortMode::CustomFormat:
                        Config.browser_sort_mode = SortMode::NoOp;
                        Statusbar::print("Do not sort songs");
                        break;
                case SortMode::NoOp:
                        Config.browser_sort_mode = SortMode::Name;
                        Statusbar::print("Sort songs by: name");
        }
        if (Config.browser_sort_mode != SortMode::NoOp)
                std::sort(myBrowser->main().begin()+(myBrowser->CurrentDir() != "/"), myBrowser->main().end(),
                        LocaleBasedItemSorting(std::locale(), Config.ignore_leading_the, Config.browser_sort_mode)
                );
}

bool ToggleLibraryTagType::canBeRun() const
{
        return (myScreen->isActiveWindow(myLibrary->Tags))
            || (myLibrary->Columns() == 2 && myScreen->isActiveWindow(myLibrary->Albums));
}

void ToggleLibraryTagType::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << "Tag type? [" << NC::Format::Bold << 'a' << NC::Format::NoBold << "rtist/album" << NC::Format::Bold << 'A' << NC::Format::NoBold << "rtist/" << NC::Format::Bold << 'y' << NC::Format::NoBold << "ear/" << NC::Format::Bold << 'g' << NC::Format::NoBold << "enre/" << NC::Format::Bold << 'c' << NC::Format::NoBold << "omposer/" << NC::Format::Bold << 'p' << NC::Format::NoBold << "erformer] ";
        wFooter->refresh();
        int answer = 0;
        do
        {
                Status::trace();
                answer = wFooter->readKey();
        }
        while (answer != 'a' && answer != 'A' && answer != 'y' && answer != 'g' && answer != 'c' && answer != 'p');
        Statusbar::unlock();
        mpd_tag_type new_tagitem = charToTagType(answer);
        if (new_tagitem != Config.media_lib_primary_tag)
        {
                Config.media_lib_primary_tag = new_tagitem;
                std::string item_type = tagTypeToString(Config.media_lib_primary_tag);
                myLibrary->Tags.setTitle(Config.titles_visibility ? item_type + "s" : "");
                myLibrary->Tags.reset();
                item_type = boost::locale::to_lower(item_type);
                std::string and_mtime = Config.media_library_sort_by_mtime ?
                                        " and mtime" :
                                        "";
                if (myLibrary->Columns() == 2)
                {
                        myLibrary->Songs.clear();
                        myLibrary->Albums.reset();
                        myLibrary->Albums.clear();
                        myLibrary->Albums.setTitle(Config.titles_visibility ? "Albums (sorted by " + item_type + and_mtime + ")" : "");
                        myLibrary->Albums.display();
                }
                else
                {
                        myLibrary->Tags.clear();
                        myLibrary->Tags.display();
                }
                Statusbar::printf("Switched to the list of %1%s", item_type);
        }
}

bool ToggleMediaLibrarySortMode::canBeRun() const
{
        return myScreen == myLibrary;
}

void ToggleMediaLibrarySortMode::run()
{
        myLibrary->toggleSortMode();
}

bool RefetchLyrics::canBeRun() const
{
#       ifdef HAVE_CURL_CURL_H
        return myScreen == myLyrics;
#       else
        return false;
#       endif // HAVE_CURL_CURL_H
}

void RefetchLyrics::run()
{
#       ifdef HAVE_CURL_CURL_H
        myLyrics->Refetch();
#       endif // HAVE_CURL_CURL_H
}

bool SetSelectedItemsPriority::canBeRun() const
{
        if (Mpd.Version() < 17)
        {
                Statusbar::print("Priorities are supported in MPD >= 0.17.0");
                return false;
        }
        return myScreen == myPlaylist && !myPlaylist->main().empty();
}

void SetSelectedItemsPriority::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << "Set priority [0-255]: ";
        std::string strprio = wFooter->getString();
        Statusbar::unlock();
        unsigned prio = fromString<unsigned>(strprio);
        boundsCheck(prio, 0u, 255u);
        myPlaylist->SetSelectedItemsPriority(prio);
}

bool FilterPlaylistOnPriorities::canBeRun() const
{
        return myScreen == myPlaylist;
}

void FilterPlaylistOnPriorities::run()
{
        using Global::wFooter;
        
        Statusbar::lock();
        Statusbar::put() << "Show songs with priority higher than: ";
        std::string strprio = wFooter->getString();
        Statusbar::unlock();
        unsigned prio = fromString<unsigned>(strprio);
        boundsCheck(prio, 0u, 255u);
        myPlaylist->main().filter(myPlaylist->main().begin(), myPlaylist->main().end(),
                [prio](const NC::Menu<MPD::Song>::Item &s) {
                        return s.value().getPrio() > prio;
        });
        Statusbar::printf("Playlist filtered (songs with priority higher than %1%)", prio);
}

void ShowSongInfo::run()
{
        mySongInfo->switchTo();
}

bool ShowArtistInfo::canBeRun() const
{
        #ifdef HAVE_CURL_CURL_H
        return myScreen == myLastfm
          ||   (myScreen->isActiveWindow(myLibrary->Tags)
            && !myLibrary->Tags.empty()
            && Config.media_lib_primary_tag == MPD_TAG_ARTIST)
          ||   currentSong(myScreen);
#       else
        return false;
#       endif // NOT HAVE_CURL_CURL_H
}

void ShowArtistInfo::run()
{
#       ifdef HAVE_CURL_CURL_H
        if (myScreen == myLastfm)
        {
                myLastfm->switchTo();
                return;
        }
        
        std::string artist;
        if (myScreen->isActiveWindow(myLibrary->Tags))
        {
                assert(!myLibrary->Tags.empty());
                assert(Config.media_lib_primary_tag == MPD_TAG_ARTIST);
                artist = myLibrary->Tags.current().value().tag();
        }
        else
        {
                auto s = currentSong(myScreen);
                assert(s);
                artist = s->getArtist();
        }
        
        if (!artist.empty())
        {
                myLastfm->queueJob(LastFm::ArtistInfo(artist, Config.lastfm_preferred_language));
                myLastfm->switchTo();
        }
#       endif // HAVE_CURL_CURL_H
}

void ShowLyrics::run()
{
        myLyrics->switchTo();
}

void Quit::run()
{
        ExitMainLoop = true;
}

void NextScreen::run()
{
        if (Config.screen_switcher_previous)
        {
                if (auto tababble = dynamic_cast<Tabbable *>(myScreen))
                        tababble->switchToPreviousScreen();
        }
        else if (!Config.screen_sequence.empty())
        {
                const auto &seq = Config.screen_sequence;
                auto screen_type = std::find(seq.begin(), seq.end(), myScreen->type());
                if (++screen_type == seq.end())
                        toScreen(seq.front())->switchTo();
                else
                        toScreen(*screen_type)->switchTo();
        }
}

void PreviousScreen::run()
{
        if (Config.screen_switcher_previous)
        {
                if (auto tababble = dynamic_cast<Tabbable *>(myScreen))
                        tababble->switchToPreviousScreen();
        }
        else if (!Config.screen_sequence.empty())
        {
                const auto &seq = Config.screen_sequence;
                auto screen_type = std::find(seq.begin(), seq.end(), myScreen->type());
                if (screen_type == seq.begin())
                        toScreen(seq.back())->switchTo();
                else
                        toScreen(*--screen_type)->switchTo();
        }
}

bool ShowHelp::canBeRun() const
{
        return myScreen != myHelp
#       ifdef HAVE_TAGLIB_H
            && myScreen != myTinyTagEditor
#       endif // HAVE_TAGLIB_H
        ;
}

void ShowHelp::run()
{
        myHelp->switchTo();
}

bool ShowPlaylist::canBeRun() const
{
        return myScreen != myPlaylist
#       ifdef HAVE_TAGLIB_H
            && myScreen != myTinyTagEditor
#       endif // HAVE_TAGLIB_H
        ;
}

void ShowPlaylist::run()
{
        myPlaylist->switchTo();
}

bool ShowBrowser::canBeRun() const
{
        return myScreen != myBrowser
#       ifdef HAVE_TAGLIB_H
            && myScreen != myTinyTagEditor
#       endif // HAVE_TAGLIB_H
        ;
}

void ShowBrowser::run()
{
        myBrowser->switchTo();
}

bool ChangeBrowseMode::canBeRun() const
{
        return myScreen == myBrowser;
}

void ChangeBrowseMode::run()
{
        myBrowser->ChangeBrowseMode();
}

bool ShowSearchEngine::canBeRun() const
{
        return myScreen != mySearcher
#       ifdef HAVE_TAGLIB_H
            && myScreen != myTinyTagEditor
#       endif // HAVE_TAGLIB_H
        ;
}

void ShowSearchEngine::run()
{
        mySearcher->switchTo();
}

bool ResetSearchEngine::canBeRun() const
{
        return myScreen == mySearcher;
}

void ResetSearchEngine::run()
{
        mySearcher->reset();
}

bool ShowMediaLibrary::canBeRun() const
{
        return myScreen != myLibrary
#       ifdef HAVE_TAGLIB_H
            && myScreen != myTinyTagEditor
#       endif // HAVE_TAGLIB_H
        ;
}

void ShowMediaLibrary::run()
{
        myLibrary->switchTo();
}

bool ToggleMediaLibraryColumnsMode::canBeRun() const
{
        return myScreen == myLibrary;
}

void ToggleMediaLibraryColumnsMode::run()
{
        myLibrary->toggleColumnsMode();
        myLibrary->refresh();
}

bool ShowPlaylistEditor::canBeRun() const
{
        return myScreen != myPlaylistEditor
#       ifdef HAVE_TAGLIB_H
            && myScreen != myTinyTagEditor
#       endif // HAVE_TAGLIB_H
        ;
}

void ShowPlaylistEditor::run()
{
        myPlaylistEditor->switchTo();
}

bool ShowTagEditor::canBeRun() const
{
#       ifdef HAVE_TAGLIB_H
        return myScreen != myTagEditor
            && myScreen != myTinyTagEditor;
#       else
        return false;
#       endif // HAVE_TAGLIB_H
}

void ShowTagEditor::run()
{
#       ifdef HAVE_TAGLIB_H
        if (isMPDMusicDirSet())
                myTagEditor->switchTo();
#       endif // HAVE_TAGLIB_H
}

bool ShowOutputs::canBeRun() const
{
#       ifdef ENABLE_OUTPUTS
        return myScreen != myOutputs
#       ifdef HAVE_TAGLIB_H     
            && myScreen != myTinyTagEditor
#       endif // HAVE_TAGLIB_H
        ;
#       else
        return false;
#       endif // ENABLE_OUTPUTS
}

void ShowOutputs::run()
{
#       ifdef ENABLE_OUTPUTS
        myOutputs->switchTo();
#       endif // ENABLE_OUTPUTS
}

bool ShowVisualizer::canBeRun() const
{
#       ifdef ENABLE_VISUALIZER
        return myScreen != myVisualizer
#       ifdef HAVE_TAGLIB_H
            && myScreen != myTinyTagEditor
#       endif // HAVE_TAGLIB_H
        ;
#       else
        return false;
#       endif // ENABLE_VISUALIZER
}

void ShowVisualizer::run()
{
#       ifdef ENABLE_VISUALIZER
        myVisualizer->switchTo();
#       endif // ENABLE_VISUALIZER
}

bool ShowClock::canBeRun() const
{
#       ifdef ENABLE_CLOCK
        return myScreen != myClock
#       ifdef HAVE_TAGLIB_H
            && myScreen != myTinyTagEditor
#       endif // HAVE_TAGLIB_H
        ;
#       else
        return false;
#       endif // ENABLE_CLOCK
}

void ShowClock::run()
{
#       ifdef ENABLE_CLOCK
        myClock->switchTo();
#       endif // ENABLE_CLOCK
}

#ifdef HAVE_TAGLIB_H
bool ShowServerInfo::canBeRun() const
{
        return myScreen != myTinyTagEditor;
}
#endif // HAVE_TAGLIB_H

void ShowServerInfo::run()
{
        myServerInfo->switchTo();
}

}

namespace {//

void populateActions()
{
        auto insert_action = [](Actions::BaseAction *a) {
                AvailableActions[static_cast<size_t>(a->type())] = a;
        };
        insert_action(new Actions::Dummy());
        insert_action(new Actions::MouseEvent());
        insert_action(new Actions::ScrollUp());
        insert_action(new Actions::ScrollDown());
        insert_action(new Actions::ScrollUpArtist());
        insert_action(new Actions::ScrollUpAlbum());
        insert_action(new Actions::ScrollDownArtist());
        insert_action(new Actions::ScrollDownAlbum());
        insert_action(new Actions::PageUp());
        insert_action(new Actions::PageDown());
        insert_action(new Actions::MoveHome());
        insert_action(new Actions::MoveEnd());
        insert_action(new Actions::ToggleInterface());
        insert_action(new Actions::JumpToParentDirectory());
        insert_action(new Actions::PressEnter());
        insert_action(new Actions::PressSpace());
        insert_action(new Actions::PreviousColumn());
        insert_action(new Actions::NextColumn());
        insert_action(new Actions::MasterScreen());
        insert_action(new Actions::SlaveScreen());
        insert_action(new Actions::VolumeUp());
        insert_action(new Actions::VolumeDown());
        insert_action(new Actions::DeletePlaylistItems());
        insert_action(new Actions::DeleteStoredPlaylist());
        insert_action(new Actions::DeleteBrowserItems());
        insert_action(new Actions::ReplaySong());
        insert_action(new Actions::PreviousSong());
        insert_action(new Actions::NextSong());
        insert_action(new Actions::Pause());
        insert_action(new Actions::Stop());
        insert_action(new Actions::ExecuteCommand());
        insert_action(new Actions::SavePlaylist());
        insert_action(new Actions::MoveSortOrderUp());
        insert_action(new Actions::MoveSortOrderDown());
        insert_action(new Actions::MoveSelectedItemsUp());
        insert_action(new Actions::MoveSelectedItemsDown());
        insert_action(new Actions::MoveSelectedItemsTo());
        insert_action(new Actions::Add());
        insert_action(new Actions::SeekForward());
        insert_action(new Actions::SeekBackward());
        insert_action(new Actions::ToggleDisplayMode());
        insert_action(new Actions::ToggleSeparatorsBetweenAlbums());
        insert_action(new Actions::ToggleLyricsFetcher());
        insert_action(new Actions::ToggleFetchingLyricsInBackground());
        insert_action(new Actions::TogglePlayingSongCentering());
        insert_action(new Actions::UpdateDatabase());
        insert_action(new Actions::JumpToPlayingSong());
        insert_action(new Actions::ToggleRepeat());
        insert_action(new Actions::Shuffle());
        insert_action(new Actions::ToggleRandom());
        insert_action(new Actions::StartSearching());
        insert_action(new Actions::SaveTagChanges());
        insert_action(new Actions::ToggleSingle());
        insert_action(new Actions::ToggleConsume());
        insert_action(new Actions::ToggleCrossfade());
        insert_action(new Actions::SetCrossfade());
        insert_action(new Actions::SetVolume());
        insert_action(new Actions::EditSong());
        insert_action(new Actions::EditLibraryTag());
        insert_action(new Actions::EditLibraryAlbum());
        insert_action(new Actions::EditDirectoryName());
        insert_action(new Actions::EditPlaylistName());
        insert_action(new Actions::EditLyrics());
        insert_action(new Actions::JumpToBrowser());
        insert_action(new Actions::JumpToMediaLibrary());
        insert_action(new Actions::JumpToPlaylistEditor());
        insert_action(new Actions::ToggleScreenLock());
        insert_action(new Actions::JumpToTagEditor());
        insert_action(new Actions::JumpToPositionInSong());
        insert_action(new Actions::ReverseSelection());
        insert_action(new Actions::RemoveSelection());
        insert_action(new Actions::SelectAlbum());
        insert_action(new Actions::AddSelectedItems());
        insert_action(new Actions::CropMainPlaylist());
        insert_action(new Actions::CropPlaylist());
        insert_action(new Actions::ClearMainPlaylist());
        insert_action(new Actions::ClearPlaylist());
        insert_action(new Actions::SortPlaylist());
        insert_action(new Actions::ReversePlaylist());
        insert_action(new Actions::ApplyFilter());
        insert_action(new Actions::Find());
        insert_action(new Actions::FindItemForward());
        insert_action(new Actions::FindItemBackward());
        insert_action(new Actions::NextFoundItem());
        insert_action(new Actions::PreviousFoundItem());
        insert_action(new Actions::ToggleFindMode());
        insert_action(new Actions::ToggleReplayGainMode());
        insert_action(new Actions::ToggleSpaceMode());
        insert_action(new Actions::ToggleAddMode());
        insert_action(new Actions::ToggleMouse());
        insert_action(new Actions::ToggleBitrateVisibility());
        insert_action(new Actions::AddRandomItems());
        insert_action(new Actions::ToggleBrowserSortMode());
        insert_action(new Actions::ToggleLibraryTagType());
        insert_action(new Actions::ToggleMediaLibrarySortMode());
        insert_action(new Actions::RefetchLyrics());
        insert_action(new Actions::SetSelectedItemsPriority());
        insert_action(new Actions::FilterPlaylistOnPriorities());
        insert_action(new Actions::ShowSongInfo());
        insert_action(new Actions::ShowArtistInfo());
        insert_action(new Actions::ShowLyrics());
        insert_action(new Actions::Quit());
        insert_action(new Actions::NextScreen());
        insert_action(new Actions::PreviousScreen());
        insert_action(new Actions::ShowHelp());
        insert_action(new Actions::ShowPlaylist());
        insert_action(new Actions::ShowBrowser());
        insert_action(new Actions::ChangeBrowseMode());
        insert_action(new Actions::ShowSearchEngine());
        insert_action(new Actions::ResetSearchEngine());
        insert_action(new Actions::ShowMediaLibrary());
        insert_action(new Actions::ToggleMediaLibraryColumnsMode());
        insert_action(new Actions::ShowPlaylistEditor());
        insert_action(new Actions::ShowTagEditor());
        insert_action(new Actions::ShowOutputs());
        insert_action(new Actions::ShowVisualizer());
        insert_action(new Actions::ShowClock());
        insert_action(new Actions::ShowServerInfo());
}

void seek()
{
        using Global::wHeader;
        using Global::wFooter;
        using Global::Timer;
        using Global::SeekingInProgress;
        
        if (!myPlaylist->currentSongLength())
        {
                Statusbar::print("Unknown item length");
                return;
        }
        
        Progressbar::lock();
        Statusbar::lock();
        
        unsigned songpos = Status::State::elapsedTime();
        auto t = Timer;
        
        int old_timeout = wFooter->getTimeout();
        wFooter->setTimeout(500);
        
        auto seekForward = &Actions::get(Actions::Type::SeekForward);
        auto seekBackward = &Actions::get(Actions::Type::SeekBackward);
        
        SeekingInProgress = true;
        while (true)
        {
                Status::trace();
                
                unsigned howmuch = Config.incremental_seeking
                                 ? (Timer-t).seconds()/2+Config.seek_time
                                 : Config.seek_time;
                
                Key input = Key::read(*wFooter);
                auto k = Bindings.get(input);
                if (k.first == k.second || !k.first->isSingle()) // no single action?
                        break;
                auto a = k.first->action();
                if (a == seekForward)
                {
                        if (songpos < myPlaylist->currentSongLength())
                                songpos = std::min(songpos + howmuch, myPlaylist->currentSongLength());
                }
                else if (a == seekBackward)
                {
                        if (songpos > 0)
                        {
                                if (songpos < howmuch)
                                        songpos = 0;
                                else
                                        songpos -= howmuch;
                        }
                }
                else
                        break;
                
                *wFooter << NC::Format::Bold;
                std::string tracklength;
                switch (Config.design)
                {
                        case Design::Classic:
                                tracklength = " [";
                                if (Config.display_remaining_time)
                                {
                                        tracklength += "-";
                                        tracklength += MPD::Song::ShowTime(myPlaylist->currentSongLength()-songpos);
                                }
                                else
                                        tracklength += MPD::Song::ShowTime(songpos);
                                tracklength += "/";
                                tracklength += MPD::Song::ShowTime(myPlaylist->currentSongLength());
                                tracklength += "]";
                                *wFooter << NC::XY(wFooter->getWidth()-tracklength.length(), 1) << tracklength;
                                break;
                        case Design::Alternative:
                                if (Config.display_remaining_time)
                                {
                                        tracklength = "-";
                                        tracklength += MPD::Song::ShowTime(myPlaylist->currentSongLength()-songpos);
                                }
                                else
                                        tracklength = MPD::Song::ShowTime(songpos);
                                tracklength += "/";
                                tracklength += MPD::Song::ShowTime(myPlaylist->currentSongLength());
                                *wHeader << NC::XY(0, 0) << tracklength << " ";
                                wHeader->refresh();
                                break;
                }
                *wFooter << NC::Format::NoBold;
                Progressbar::draw(songpos, myPlaylist->currentSongLength());
                wFooter->refresh();
        }
        SeekingInProgress = false;
        Mpd.Seek(myPlaylist->currentSongPosition(), songpos);
        
        wFooter->setTimeout(old_timeout);
        
        Progressbar::unlock();
        Statusbar::unlock();
}

void findItem(const Find direction)
{
        using Global::wFooter;
        
        Searchable *w = dynamic_cast<Searchable *>(myScreen);
        assert(w);
        assert(w->allowsSearching());
        
        Statusbar::lock();
        Statusbar::put() << "Find " << (direction == Find::Forward ? "forward" : "backward") << ": ";
        std::string findme = wFooter->getString();
        Statusbar::unlock();
        
        if (!findme.empty())
                Statusbar::print("Searching...");
        
        bool success = w->search(findme);
        
        if (findme.empty())
                return;
        
        if (success)
                Statusbar::print("Searching finished");
        else
                Statusbar::printf("Unable to find \"%1%\"", findme);
        
        if (direction == ::Find::Forward)
                w->nextFound(Config.wrapped_search);
        else
                w->prevFound(Config.wrapped_search);
        
        if (myScreen == myPlaylist)
                myPlaylist->EnableHighlighting();
}

void listsChangeFinisher()
{
        if (myScreen == myLibrary
        ||  myScreen == myPlaylistEditor
#       ifdef HAVE_TAGLIB_H
        ||  myScreen == myTagEditor
#       endif // HAVE_TAGLIB_H
           )
        {
                if (myScreen->activeWindow() == &myLibrary->Tags)
                {
                        myLibrary->Albums.clear();
                        myLibrary->Albums.refresh();
                        myLibrary->Songs.clear();
                        myLibrary->Songs.refresh();
                        myLibrary->updateTimer();
                }
                else if (myScreen->activeWindow() == &myLibrary->Albums)
                {
                        myLibrary->Songs.clear();
                        myLibrary->Songs.refresh();
                        myLibrary->updateTimer();
                }
                else if (myScreen->isActiveWindow(myPlaylistEditor->Playlists))
                {
                        myPlaylistEditor->Content.clear();
                        myPlaylistEditor->Content.refresh();
                        myPlaylistEditor->updateTimer();
                }
#               ifdef HAVE_TAGLIB_H
                else if (myScreen->activeWindow() == myTagEditor->Dirs)
                {
                        myTagEditor->Tags->clear();
                }
#               endif // HAVE_TAGLIB_H
        }
}

}