playlist_edit: convert to C++

1 files changed, 481 insertions, 0 deletions

diff --git a/src/PlaylistEdit.cxx b/src/PlaylistEdit.cxx
new file mode 100644
index 00000000..76e10286
--- /dev/null
+++ b/src/PlaylistEdit.cxx
@@ -0,0 +1,481 @@
+/*
+ * 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"
+extern "C" {
+#include "playlist_internal.h"
+#include "player_control.h"
+#include "database.h"
+#include "uri.h"
+#include "song.h"
+#include "idle.h"
+}
+
+#include <stdlib.h>
+
+static void playlist_increment_version(struct playlist *playlist)
+{
+	queue_increment_version(&playlist->queue);
+
+	idle_add(IDLE_PLAYLIST);
+}
+
+void
+playlist_clear(struct playlist *playlist, struct player_control *pc)
+{
+	playlist_stop(playlist, pc);
+
+	queue_clear(&playlist->queue);
+
+	playlist->current = -1;
+
+	playlist_increment_version(playlist);
+}
+
+enum playlist_result
+playlist_append_file(struct playlist *playlist, struct player_control *pc,
+		     const char *path_fs, unsigned *added_id)
+{
+	struct song *song = song_file_load(path_fs, NULL);
+	if (song == NULL)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return playlist_append_song(playlist, pc, song, added_id);
+}
+
+enum playlist_result
+playlist_append_song(struct playlist *playlist, struct player_control *pc,
+		  struct song *song, unsigned *added_id)
+{
+	const struct song *queued;
+	unsigned id;
+
+	if (queue_is_full(&playlist->queue))
+		return PLAYLIST_RESULT_TOO_LARGE;
+
+	queued = playlist_get_queued_song(playlist);
+
+	id = queue_append(&playlist->queue, song, 0);
+
+	if (playlist->queue.random) {
+		/* shuffle the new song into the list of remaining
+		   songs to play */
+
+		unsigned start;
+		if (playlist->queued >= 0)
+			start = playlist->queued + 1;
+		else
+			start = playlist->current + 1;
+		if (start < queue_length(&playlist->queue))
+			queue_shuffle_order_last(&playlist->queue, start,
+						 queue_length(&playlist->queue));
+	}
+
+	playlist_increment_version(playlist);
+
+	playlist_update_queued_song(playlist, pc, queued);
+
+	if (added_id)
+		*added_id = id;
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+static struct song *
+song_by_uri(const char *uri)
+{
+	struct song *song;
+
+	song = db_get_song(uri);
+	if (song != NULL)
+		return song;
+
+	if (uri_has_scheme(uri))
+		return song_remote_new(uri);
+
+	return NULL;
+}
+
+enum playlist_result
+playlist_append_uri(struct playlist *playlist, struct player_control *pc,
+		    const char *uri, unsigned *added_id)
+{
+	struct song *song;
+
+	g_debug("add to playlist: %s", uri);
+
+	song = song_by_uri(uri);
+	if (song == NULL)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	enum playlist_result result =
+		playlist_append_song(playlist, pc, song, added_id);
+	if (song_in_database(song))
+		db_return_song(song);
+
+	return result;
+}
+
+enum playlist_result
+playlist_swap_songs(struct playlist *playlist, struct player_control *pc,
+		    unsigned song1, unsigned song2)
+{
+	const struct song *queued;
+
+	if (!queue_valid_position(&playlist->queue, song1) ||
+	    !queue_valid_position(&playlist->queue, song2))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	queued = playlist_get_queued_song(playlist);
+
+	queue_swap(&playlist->queue, song1, song2);
+
+	if (playlist->queue.random) {
+		/* update the queue order, so that playlist->current
+		   still points to the current song order */
+
+		queue_swap_order(&playlist->queue,
+				 queue_position_to_order(&playlist->queue,
+							 song1),
+				 queue_position_to_order(&playlist->queue,
+							 song2));
+	} else {
+		/* correct the "current" song order */
+
+		if (playlist->current == (int)song1)
+			playlist->current = song2;
+		else if (playlist->current == (int)song2)
+			playlist->current = song1;
+	}
+
+	playlist_increment_version(playlist);
+
+	playlist_update_queued_song(playlist, pc, queued);
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist_swap_songs_id(struct playlist *playlist, struct player_control *pc,
+		       unsigned id1, unsigned id2)
+{
+	int song1 = queue_id_to_position(&playlist->queue, id1);
+	int song2 = queue_id_to_position(&playlist->queue, id2);
+
+	if (song1 < 0 || song2 < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return playlist_swap_songs(playlist, pc, song1, song2);
+}
+
+enum playlist_result
+playlist_set_priority(struct playlist *playlist, struct player_control *pc,
+		      unsigned start, unsigned end,
+		      uint8_t priority)
+{
+	if (start >= queue_length(&playlist->queue))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	if (end > queue_length(&playlist->queue))
+		end = queue_length(&playlist->queue);
+
+	if (start >= end)
+		return PLAYLIST_RESULT_SUCCESS;
+
+	/* remember "current" and "queued" */
+
+	int current_position = playlist->current >= 0
+		? (int)queue_order_to_position(&playlist->queue,
+					       playlist->current)
+		: -1;
+
+	const struct song *queued = playlist_get_queued_song(playlist);
+
+	/* apply the priority changes */
+
+	queue_set_priority_range(&playlist->queue, start, end, priority,
+				 playlist->current);
+
+	playlist_increment_version(playlist);
+
+	/* restore "current" and choose a new "queued" */
+
+	if (current_position >= 0)
+		playlist->current = queue_position_to_order(&playlist->queue,
+							    current_position);
+
+	playlist_update_queued_song(playlist, pc, queued);
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist_set_priority_id(struct playlist *playlist, struct player_control *pc,
+			 unsigned song_id, uint8_t priority)
+{
+	int song_position = queue_id_to_position(&playlist->queue, song_id);
+	if (song_position < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return playlist_set_priority(playlist, pc,
+				     song_position, song_position + 1,
+				     priority);
+
+}
+
+static void
+playlist_delete_internal(struct playlist *playlist, struct player_control *pc,
+			 unsigned song, const struct song **queued_p)
+{
+	unsigned songOrder;
+
+	assert(song < queue_length(&playlist->queue));
+
+	songOrder = queue_position_to_order(&playlist->queue, song);
+
+	if (playlist->playing && playlist->current == (int)songOrder) {
+		bool paused = pc_get_state(pc) == PLAYER_STATE_PAUSE;
+
+		/* the current song is going to be deleted: stop the player */
+
+		pc_stop(pc);
+		playlist->playing = false;
+
+		/* see which song is going to be played instead */
+
+		playlist->current = queue_next_order(&playlist->queue,
+						     playlist->current);
+		if (playlist->current == (int)songOrder)
+			playlist->current = -1;
+
+		if (playlist->current >= 0 && !paused)
+			/* play the song after the deleted one */
+			playlist_play_order(playlist, pc, playlist->current);
+		else
+			/* no songs left to play, stop playback
+			   completely */
+			playlist_stop(playlist, pc);
+
+		*queued_p = NULL;
+	} else if (playlist->current == (int)songOrder)
+		/* there's a "current song" but we're not playing
+		   currently - clear "current" */
+		playlist->current = -1;
+
+	/* now do it: remove the song */
+
+	queue_delete(&playlist->queue, song);
+
+	/* update the "current" and "queued" variables */
+
+	if (playlist->current > (int)songOrder) {
+		playlist->current--;
+	}
+}
+
+enum playlist_result
+playlist_delete(struct playlist *playlist, struct player_control *pc,
+		unsigned song)
+{
+	const struct song *queued;
+
+	if (song >= queue_length(&playlist->queue))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	queued = playlist_get_queued_song(playlist);
+
+	playlist_delete_internal(playlist, pc, song, &queued);
+
+	playlist_increment_version(playlist);
+	playlist_update_queued_song(playlist, pc, queued);
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist_delete_range(struct playlist *playlist, struct player_control *pc,
+		      unsigned start, unsigned end)
+{
+	const struct song *queued;
+
+	if (start >= queue_length(&playlist->queue))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	if (end > queue_length(&playlist->queue))
+		end = queue_length(&playlist->queue);
+
+	if (start >= end)
+		return PLAYLIST_RESULT_SUCCESS;
+
+	queued = playlist_get_queued_song(playlist);
+
+	do {
+		playlist_delete_internal(playlist, pc, --end, &queued);
+	} while (end != start);
+
+	playlist_increment_version(playlist);
+	playlist_update_queued_song(playlist, pc, queued);
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist_delete_id(struct playlist *playlist, struct player_control *pc,
+		   unsigned id)
+{
+	int song = queue_id_to_position(&playlist->queue, id);
+	if (song < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return playlist_delete(playlist, pc, song);
+}
+
+void
+playlist_delete_song(struct playlist *playlist, struct player_control *pc,
+		     const struct song *song)
+{
+	for (int i = queue_length(&playlist->queue) - 1; i >= 0; --i)
+		if (song == queue_get(&playlist->queue, i))
+			playlist_delete(playlist, pc, i);
+}
+
+enum playlist_result
+playlist_move_range(struct playlist *playlist, struct player_control *pc,
+		    unsigned start, unsigned end, int to)
+{
+	const struct song *queued;
+	int currentSong;
+
+	if (!queue_valid_position(&playlist->queue, start) ||
+		!queue_valid_position(&playlist->queue, end - 1))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	if ((to >= 0 && to + end - start - 1 >= queue_length(&playlist->queue)) ||
+	    (to < 0 && abs(to) > (int)queue_length(&playlist->queue)))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	if ((int)start == to)
+		/* nothing happens */
+		return PLAYLIST_RESULT_SUCCESS;
+
+	queued = playlist_get_queued_song(playlist);
+
+	/*
+	 * (to < 0) => move to offset from current song
+	 * (-playlist.length == to) => move to position BEFORE current song
+	 */
+	currentSong = playlist->current >= 0
+		? (int)queue_order_to_position(&playlist->queue,
+					      playlist->current)
+		: -1;
+	if (to < 0 && playlist->current >= 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)) % queue_length(&playlist->queue);
+		if (start < (unsigned)to)
+			to--;
+	}
+
+	queue_move_range(&playlist->queue, start, end, to);
+
+	if (!playlist->queue.random) {
+		/* update current/queued */
+		if ((int)start <= playlist->current &&
+		    (unsigned)playlist->current < end)
+			playlist->current += to - start;
+		else if (playlist->current >= (int)end &&
+			 playlist->current <= to) {
+			playlist->current -= end - start;
+		} else if (playlist->current >= to &&
+			   playlist->current < (int)start) {
+			playlist->current += end - start;
+		}
+	}
+
+	playlist_increment_version(playlist);
+
+	playlist_update_queued_song(playlist, pc, queued);
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playlist_move_id(struct playlist *playlist, struct player_control *pc,
+		 unsigned id1, int to)
+{
+	int song = queue_id_to_position(&playlist->queue, id1);
+	if (song < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return playlist_move_range(playlist, pc, song, song+1, to);
+}
+
+void
+playlist_shuffle(struct playlist *playlist, struct player_control *pc,
+		 unsigned start, unsigned end)
+{
+	const struct song *queued;
+
+	if (end > queue_length(&playlist->queue))
+		/* correct the "end" offset */
+		end = queue_length(&playlist->queue);
+
+	if ((start+1) >= end)
+		/* needs at least two entries. */
+		return;
+
+	queued = playlist_get_queued_song(playlist);
+	if (playlist->playing && playlist->current >= 0) {
+		unsigned current_position;
+		current_position = queue_order_to_position(&playlist->queue,
+	                                                   playlist->current);
+
+		if (current_position >= start && current_position < end)
+		{
+			/* put current playing song first */
+			queue_swap(&playlist->queue, start, current_position);
+
+			if (playlist->queue.random) {
+				playlist->current =
+					queue_position_to_order(&playlist->queue, start);
+			} else
+				playlist->current = start;
+
+			/* start shuffle after the current song */
+			start++;
+		}
+	} else {
+		/* no playback currently: reset playlist->current */
+
+		playlist->current = -1;
+	}
+
+	queue_shuffle_range(&playlist->queue, start, end);
+
+	playlist_increment_version(playlist);
+
+	playlist_update_queued_song(playlist, pc, queued);
+}