ca427bc7379b43d3fac2fb567c17419d836ebc37
[paraslash.git] / playlist.c
1 #include "para.h"
2 #include "error.h"
3 #include "string.h"
4 #include "afh.h"
5 #include "afs.h"
6
7 /** \file playlist.c Functions for loading and saving playlists. */
8
9 /** Structure used for adding entries to a playlist. */
10 struct playlist_info {
11 /** The name of the playlist. */
12 char *name;
13 /** The number of entries currently in the playlist. */
14 unsigned length;
15 };
16 static struct playlist_info current_playlist;
17
18 /**
19 * Re-insert an audio file into the tree of admissible files.
20 *
21 * \param aft_row Determines the audio file.
22 *
23 * \return The return value of score_update().
24 */
25 int playlist_update_audio_file(struct osl_row *aft_row)
26 {
27 /* always re-insert to the top of the tree */
28 return score_update(aft_row, 0);
29 }
30
31 static int add_playlist_entry(char *path, void *data)
32 {
33 struct playlist_info *playlist = data;
34 struct osl_row *aft_row;
35 int ret = aft_get_row_of_path(path, &aft_row);
36
37 if (ret < 0) {
38 PARA_NOTICE_LOG("%s: %s\n", path, PARA_STRERROR(-ret));
39 return 1;
40 }
41 ret = score_add(aft_row, -playlist->length);
42 if (ret < 0) {
43 PARA_ERROR_LOG("failed to add %s: %d\n", path, ret);
44 return ret;
45 }
46 playlist->length++;
47 return 1;
48 }
49
50 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
51 static int load_playlist(struct osl_row *row, void *data)
52 {
53 struct playlist_info *playlist = data;
54 struct osl_object playlist_def;
55 char *playlist_name;
56 int ret;
57
58 ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
59 if (ret < 0)
60 goto err;
61 playlist->length = 0;
62 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
63 add_playlist_entry, playlist);
64 osl_close_disk_object(&playlist_def);
65 if (ret < 0)
66 goto err;
67 ret = -E_PLAYLIST_EMPTY;
68 if (!playlist->length)
69 goto err;
70 playlist->name = para_strdup(playlist_name);
71 PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
72 playlist->length);
73 return -E_PLAYLIST_LOADED;
74 err:
75 if (ret != -E_DUMMY_ROW)
76 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
77 PARA_STRERROR(-ret));
78 return 1;
79 }
80
81 static int load_first_available_playlist(struct playlist_info *playlist)
82 {
83 int ret = osl_rbtree_loop(playlists_table, BLOBCOL_NAME, playlist,
84 load_playlist);
85 if (ret == -E_PLAYLIST_LOADED) /* success */
86 return 1;
87 if (ret < 0)
88 return ret; /* error */
89 PARA_NOTICE_LOG("no valid playlist found\n");
90 return -E_NO_PLAYLIST;
91 }
92
93 static int check_playlist_path(char *path, void *data)
94 {
95 struct para_buffer *pb = data;
96 struct osl_row *aft_row;
97 int ret = aft_get_row_of_path(path, &aft_row);
98
99 if (ret < 0)
100 para_printf(pb, "%s: %s\n", path, PARA_STRERROR(-ret));
101 return 1;
102 }
103
104 static int check_playlist(struct osl_row *row, void *data)
105 {
106 struct para_buffer *pb = data;
107 struct osl_object playlist_def;
108 char *playlist_name;
109 int ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
110
111 if (ret < 0) {
112 para_printf(pb, "failed to get playlist data: %s\n",
113 PARA_STRERROR(-ret));
114 return 1;
115 }
116 if (*playlist_name) { /* skip dummy row */
117 para_printf(pb, "checking playlist %s...\n", playlist_name);
118 for_each_line_ro(playlist_def.data, playlist_def.size,
119 check_playlist_path, pb);
120 }
121 osl_close_disk_object(&playlist_def);
122 return 1;
123 }
124
125 /**
126 * Check the playlist table for inconsistencies.
127 *
128 * \param query Unused.
129 * \param result Contains messages about inconsistencies.
130 *
131 * \return The return value of the underlying call to osl_rbtree_loop().
132 */
133 int playlist_check_callback(__a_unused const struct osl_object *query,
134 struct osl_object *result)
135 {
136 struct para_buffer pb = {.buf = NULL};
137
138 para_printf(&pb, "checking playlists...\n");
139 osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
140 check_playlist);
141 result->data = pb.buf;
142 result->size = pb.size;
143 return 1;
144 }
145
146 /**
147 * Close the current playlist.
148 *
149 * \sa playlist_open().
150 */
151 void playlist_close(void)
152 {
153 free(current_playlist.name);
154 current_playlist.name = NULL;
155 }
156
157 /**
158 * Open the given playlist.
159 *
160 * \param name The name of the playlist to open.
161 *
162 * If name is \p NULL, load the first available playlist. Files which are
163 * listed in the playlist, but not contained in the database are ignored.
164 * This is not considered an error.
165 *
166 * \return Positive on success, negative on errors. Possible errors
167 * include: Given playlist not found, -E_NO_PLAYLIST (no playlist defined).
168 */
169 int playlist_open(char *name)
170 {
171 struct osl_object obj;
172 int ret;
173 struct osl_row *row;
174
175 if (!name)
176 return load_first_available_playlist(&current_playlist);
177 obj.data = name;
178 obj.size = strlen(obj.data);
179 ret = osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row);
180 if (ret < 0) {
181 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
182 return ret;
183 }
184 return load_playlist(row, &current_playlist);
185 }