1 files changed, 423 insertions, 0 deletions
diff --git a/src/PlaylistEdit.cxx b/src/PlaylistEdit.cxx
new file mode 100644
index 00000000..df38c3da
--- /dev/null
+++ b/src/PlaylistEdit.cxx
@@ -0,0 +1,423 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ * Functions for editing the playlist (adding, removing, reordering
+ * songs in the queue).
+ *
+ */
+
+#include "config.h"
+#include "Playlist.hxx"
+#include "PlayerControl.hxx"
+
+extern "C" {
+#include "uri.h"
+#include "song.h"
+}
+
+#include "Idle.hxx"
+#include "DatabaseGlue.hxx"
+#include "DatabasePlugin.hxx"
+
+#include <stdlib.h>
+
+void
+playlist::OnModified()
+{
+	queue.IncrementVersion();
+
+	idle_add(IDLE_PLAYLIST);
+}
+
+void
+playlist::Clear(player_control &pc)
+{
+	Stop(pc);
+
+	queue.Clear();
+	current = -1;
+
+	OnModified();
+}
+
+enum playlist_result
+playlist::AppendFile(struct player_control &pc,
+		     const char *path_utf8, unsigned *added_id)
+{
+	struct song *song = song_file_load(path_utf8, NULL);
+	if (song == NULL)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return AppendSong(pc, song, added_id);
+}
+
+enum playlist_result
+playlist::AppendSong(struct player_control &pc,
+		     struct song *song, unsigned *added_id)
+{
+	unsigned id;
+
+	if (queue.IsFull())
+		return PLAYLIST_RESULT_TOO_LARGE;
+
+	const struct song *const queued_song = GetQueuedSong();
+
+	id = queue.Append(song, 0);
+
+	if (queue.random) {
+		/* shuffle the new song into the list of remaining
+		   songs to play */
+
+		unsigned start;
+		if (queued >= 0)
+			start = queued + 1;
+		else
+			start = current + 1;
+		if (start < queue.GetLength())
+			queue.ShuffleOrderLast(start, queue.GetLength());
+	}
+
+	UpdateQueuedSong(pc, queued_song);
+	OnModified();
+
+	if (added_id)
+		*added_id = id;
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist::AppendURI(struct player_control &pc,
+		    const char *uri, unsigned *added_id)
+{
+	g_debug("add to playlist: %s", uri);
+
+	const Database *db = nullptr;
+	struct song *song;
+	if (uri_has_scheme(uri)) {
+		song = song_remote_new(uri);
+	} else {
+		db = GetDatabase(nullptr);
+		if (db == nullptr)
+			return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+		song = db->GetSong(uri, nullptr);
+		if (song == nullptr)
+			return PLAYLIST_RESULT_NO_SUCH_SONG;
+	}
+
+	enum playlist_result result = AppendSong(pc, song, added_id);
+	if (db != nullptr)
+		db->ReturnSong(song);
+
+	return result;
+}
+
+enum playlist_result
+playlist::SwapPositions(player_control &pc, unsigned song1, unsigned song2)
+{
+	if (!queue.IsValidPosition(song1) || !queue.IsValidPosition(song2))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	const struct song *const queued_song = GetQueuedSong();
+
+	queue.SwapPositions(song1, song2);
+
+	if (queue.random) {
+		/* update the queue order, so that current
+		   still points to the current song order */
+
+		queue.SwapOrders(queue.PositionToOrder(song1),
+				 queue.PositionToOrder(song2));
+	} else {
+		/* correct the "current" song order */
+
+		if (current == (int)song1)
+			current = song2;
+		else if (current == (int)song2)
+			current = song1;
+	}
+
+	UpdateQueuedSong(pc, queued_song);
+	OnModified();
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist::SwapIds(player_control &pc, unsigned id1, unsigned id2)
+{
+	int song1 = queue.IdToPosition(id1);
+	int song2 = queue.IdToPosition(id2);
+
+	if (song1 < 0 || song2 < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return SwapPositions(pc, song1, song2);
+}
+
+enum playlist_result
+playlist::SetPriorityRange(player_control &pc,
+			   unsigned start, unsigned end,
+			   uint8_t priority)
+{
+	if (start >= GetLength())
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	if (end > GetLength())
+		end = GetLength();
+
+	if (start >= end)
+		return PLAYLIST_RESULT_SUCCESS;
+
+	/* remember "current" and "queued" */
+
+	const int current_position = GetCurrentPosition();
+	const struct song *const queued_song = GetQueuedSong();
+
+	/* apply the priority changes */
+
+	queue.SetPriorityRange(start, end, priority, current);
+
+	/* restore "current" and choose a new "queued" */
+
+	if (current_position >= 0)
+		current = queue.PositionToOrder(current_position);
+
+	UpdateQueuedSong(pc, queued_song);
+	OnModified();
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist::SetPriorityId(struct player_control &pc,
+			unsigned song_id, uint8_t priority)
+{
+	int song_position = queue.IdToPosition(song_id);
+	if (song_position < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return SetPriorityRange(pc, song_position, song_position + 1,
+				priority);
+
+}
+
+void
+playlist::DeleteInternal(player_control &pc,
+			 unsigned song, const struct song **queued_p)
+{
+	assert(song < GetLength());
+
+	unsigned songOrder = queue.PositionToOrder(song);
+
+	if (playing && current == (int)songOrder) {
+		const bool paused = pc.GetState() == PLAYER_STATE_PAUSE;
+
+		/* the current song is going to be deleted: stop the player */
+
+		pc.Stop();
+		playing = false;
+
+		/* see which song is going to be played instead */
+
+		current = queue.GetNextOrder(current);
+		if (current == (int)songOrder)
+			current = -1;
+
+		if (current >= 0 && !paused)
+			/* play the song after the deleted one */
+			PlayOrder(pc, current);
+		else
+			/* no songs left to play, stop playback
+			   completely */
+			Stop(pc);
+
+		*queued_p = NULL;
+	} else if (current == (int)songOrder)
+		/* there's a "current song" but we're not playing
+		   currently - clear "current" */
+		current = -1;
+
+	/* now do it: remove the song */
+
+	queue.DeletePosition(song);
+
+	/* update the "current" and "queued" variables */
+
+	if (current > (int)songOrder)
+		current--;
+}
+
+enum playlist_result
+playlist::DeletePosition(struct player_control &pc, unsigned song)
+{
+	if (song >= queue.GetLength())
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	const struct song *queued_song = GetQueuedSong();
+
+	DeleteInternal(pc, song, &queued_song);
+
+	UpdateQueuedSong(pc, queued_song);
+	OnModified();
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist::DeleteRange(struct player_control &pc, unsigned start, unsigned end)
+{
+	if (start >= queue.GetLength())
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	if (end > queue.GetLength())
+		end = queue.GetLength();
+
+	if (start >= end)
+		return PLAYLIST_RESULT_SUCCESS;
+
+	const struct song *queued_song = GetQueuedSong();
+
+	do {
+		DeleteInternal(pc, --end, &queued_song);
+	} while (end != start);
+
+	UpdateQueuedSong(pc, queued_song);
+	OnModified();
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist::DeleteId(struct player_control &pc, unsigned id)
+{
+	int song = queue.IdToPosition(id);
+	if (song < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return DeletePosition(pc, song);
+}
+
+void
+playlist::DeleteSong(struct player_control &pc, const struct song &song)
+{
+	for (int i = queue.GetLength() - 1; i >= 0; --i)
+		// TODO: compare URI instead of pointer
+		if (&song == queue.Get(i))
+			DeletePosition(pc, i);
+}
+
+enum playlist_result
+playlist::MoveRange(player_control &pc, unsigned start, unsigned end, int to)
+{
+	if (!queue.IsValidPosition(start) || !queue.IsValidPosition(end - 1))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	if ((to >= 0 && to + end - start - 1 >= GetLength()) ||
+	    (to < 0 && unsigned(abs(to)) > GetLength()))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	if ((int)start == to)
+		/* nothing happens */
+		return PLAYLIST_RESULT_SUCCESS;
+
+	const struct song *const queued_song = GetQueuedSong();
+
+	/*
+	 * (to < 0) => move to offset from current song
+	 * (-playlist.length == to) => move to position BEFORE current song
+	 */
+	const int currentSong = GetCurrentPosition();
+	if (to < 0 && currentSong >= 0) {
+		if (start <= (unsigned)currentSong && (unsigned)currentSong < end)
+			/* no-op, can't be moved to offset of itself */
+			return PLAYLIST_RESULT_SUCCESS;
+		to = (currentSong + abs(to)) % GetLength();
+		if (start < (unsigned)to)
+			to--;
+	}
+
+	queue.MoveRange(start, end, to);
+
+	if (!queue.random) {
+		/* update current/queued */
+		if ((int)start <= current && (unsigned)current < end)
+			current += to - start;
+		else if (current >= (int)end && current <= to)
+			current -= end - start;
+		else if (current >= to && current < (int)start)
+			current += end - start;
+	}
+
+	UpdateQueuedSong(pc, queued_song);
+	OnModified();
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist::MoveId(player_control &pc, unsigned id1, int to)
+{
+	int song = queue.IdToPosition(id1);
+	if (song < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return MoveRange(pc, song, song + 1, to);
+}
+
+void
+playlist::Shuffle(player_control &pc, unsigned start, unsigned end)
+{
+	if (end > GetLength())
+		/* correct the "end" offset */
+		end = GetLength();
+
+	if (start + 1 >= end)
+		/* needs at least two entries. */
+		return;
+
+	const struct song *const queued_song = GetQueuedSong();
+	if (playing && current >= 0) {
+		unsigned current_position = queue.OrderToPosition(current);
+
+		if (current_position >= start && current_position < end) {
+			/* put current playing song first */
+			queue.SwapPositions(start, current_position);
+
+			if (queue.random) {
+				current = queue.PositionToOrder(start);
+			} else
+				current = start;
+
+			/* start shuffle after the current song */
+			start++;
+		}
+	} else {
+		/* no playback currently: reset current */
+
+		current = -1;
+	}
+
+	queue.ShuffleRange(start, end);
+
+	UpdateQueuedSong(pc, queued_song);
+	OnModified();
+}