mpd/src/directory.c

/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "directory.h"
#include "database.h"
#include "song.h"
#include "log.h"
#include "path.h"
#include "utils.h"
#include "client.h"
#include "song_print.h"
#include "song_save.h"
#include "dirvec.h"

struct directory *
directory_new(const char *dirname, struct directory *parent)
{
	struct directory *directory;

	directory = xcalloc(1, sizeof(*directory));

	if (dirname && strlen(dirname))
		directory->path = xstrdup(dirname);
	directory->parent = parent;

	return directory;
}

void
directory_free(struct directory *directory)
{
	dirvec_destroy(&directory->children);
	songvec_destroy(&directory->songs);
	if (directory->path)
		free(directory->path);
	free(directory);
	/* this resets last dir returned */
	/*directory_get_path(NULL); */
}

void
directory_prune_empty(struct directory *directory)
{
	int i;
	struct dirvec *dv = &directory->children;

	for (i = dv->nr; --i >= 0; ) {
		directory_prune_empty(dv->base[i]);
		if (directory_is_empty(dv->base[i]))
			dirvec_delete(dv, dv->base[i]);
	}
	if (!dv->nr)
		dirvec_destroy(dv);
}

struct directory *
directory_get_directory(struct directory *directory, const char *name)
{
	struct directory *cur = directory;
	struct directory *found = NULL;
	char *duplicated;
	char *locate;

	assert(name != NULL);

	if (isRootDirectory(name))
		return directory;

	duplicated = xstrdup(name);
	locate = strchr(duplicated, '/');
	while (1) {
		if (locate)
			*locate = '\0';
		if (!(found = dirvec_find(&cur->children, duplicated)))
			break;
		assert(cur == found->parent);
		cur = found;
		if (!locate)
			break;
		*locate = '/';
		locate = strchr(locate + 1, '/');
	}

	free(duplicated);

	return found;
}

static int
dirvec_print(struct client *client, const struct dirvec *dv)
{
	size_t i;

	for (i = 0; i < dv->nr; ++i) {
		client_printf(client, DIRECTORY_DIR "%s\n",
			      directory_get_path(dv->base[i]));
	}

	return 0;
}

int
directory_print(struct client *client, const struct directory *directory)
{
	dirvec_print(client, &directory->children);
	songvec_print(client, &directory->songs);

	return 0;
}

/* TODO error checking */
int
directory_save(FILE *fp, struct directory *directory)
{
	struct dirvec *children = &directory->children;
	size_t i;
	int retv;

	if (directory->path) {
		retv = fprintf(fp, "%s%s\n", DIRECTORY_BEGIN,
			       directory_get_path(directory));
		if (retv < 0)
			return -1;
	}

	for (i = 0; i < children->nr; ++i) {
		struct directory *cur = children->base[i];
		const char *base = mpd_basename(cur->path);

		retv = fprintf(fp, DIRECTORY_DIR "%s\n", base);
		if (retv < 0)
			return -1;
		if (directory_save(fp, cur) < 0)
			return -1;
	}

	songvec_save(fp, &directory->songs);

	if (directory->path &&
	    fprintf(fp, DIRECTORY_END "%s\n",
		    directory_get_path(directory)) < 0)
		return -1;
	return 0;
}

void
directory_load(FILE *fp, struct directory *directory)
{
	char buffer[MPD_PATH_MAX * 2];
	int bufferSize = MPD_PATH_MAX * 2;
	char key[MPD_PATH_MAX * 2];
	char *name;

	while (myFgets(buffer, bufferSize, fp)
	       && prefixcmp(buffer, DIRECTORY_END)) {
		if (!prefixcmp(buffer, DIRECTORY_DIR)) {
			struct directory *subdir;

			strcpy(key, &(buffer[strlen(DIRECTORY_DIR)]));
			if (!myFgets(buffer, bufferSize, fp))
				FATAL("Error reading db, fgets\n");
			/* for compatibility with db's prior to 0.11 */
			if (!prefixcmp(buffer, DIRECTORY_MTIME)) {
				if (!myFgets(buffer, bufferSize, fp))
					FATAL("Error reading db, fgets\n");
			}
			if (prefixcmp(buffer, DIRECTORY_BEGIN))
				FATAL("Error reading db at line: %s\n", buffer);
			name = &(buffer[strlen(DIRECTORY_BEGIN)]);
			if ((subdir = db_get_directory(name))) {
				assert(subdir->parent == directory);
			} else {
				subdir = directory_new(name, directory);
				dirvec_add(&directory->children, subdir);
			}
			directory_load(fp, subdir);
		} else if (!prefixcmp(buffer, SONG_BEGIN)) {
			readSongInfoIntoList(fp, &directory->songs, directory);
		} else {
			FATAL("Unknown line in db: %s\n", buffer);
		}
	}
}

void
directory_sort(struct directory *directory)
{
	int i;
	struct dirvec *dv = &directory->children;

	dirvec_sort(dv);
	songvec_sort(&directory->songs);

	for (i = dv->nr; --i >= 0; )
		directory_sort(dv->base[i]);
}

int
directory_walk(struct directory *directory,
	       int (*forEachSong)(struct song *, void *),
	       int (*forEachDir)(struct directory *, void *),
	       void *data)
{
	struct dirvec *dv = &directory->children;
	int err = 0;
	size_t j;

	if (forEachDir && (err = forEachDir(directory, data)) < 0)
		return err;

	if (forEachSong) {
		err = songvec_for_each(&directory->songs, forEachSong, data);
		if (err < 0)
			return err;
	}

	for (j = 0; err >= 0 && j < dv->nr; ++j)
		err = directory_walk(dv->base[j], forEachSong,
						forEachDir, data);

	return err;
}