1 /* ncmpc (Ncurses MPD Client)
2 * (c) 2004-2009 The Music Player Daemon Project
3 * Project homepage: http://musicpd.org
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
20 #include "strfsong.h"
21 #include "charset.h"
22 #include "utils.h"
24 #include <mpd/client.h>
26 #include <string.h>
28 static const gchar *
29 skip(const gchar * p)
30 {
31 gint stack = 0;
33 while (*p != '\0') {
34 if (*p == '[')
35 stack++;
36 if (*p == '#' && p[1] != '\0') {
37 /* skip escaped stuff */
38 ++p;
39 } else if (stack) {
40 if(*p == ']') stack--;
41 } else {
42 if(*p == '&' || *p == '|' || *p == ']') {
43 break;
44 }
45 }
46 ++p;
47 }
49 return p;
50 }
52 static char *
53 song_tag_locale(const struct mpd_song *song, enum mpd_tag_type tag)
54 {
55 const char *value = mpd_song_get_tag(song, tag, 0);
56 if (value == NULL)
57 return NULL;
59 return utf8_to_locale(value);
60 }
62 static gsize
63 _strfsong(gchar *s,
64 gsize max,
65 const gchar *format,
66 const struct mpd_song *song,
67 const gchar **last)
68 {
69 const gchar *p, *end;
70 gchar *temp;
71 gsize n, length = 0;
72 gboolean found = FALSE;
74 memset(s, 0, max);
75 if (song == NULL)
76 return 0;
78 for (p = format; *p != '\0' && length<max;) {
79 /* OR */
80 if (p[0] == '|') {
81 ++p;
82 if(!found) {
83 memset(s, 0, max);
84 length = 0;
85 } else {
86 p = skip(p);
87 }
88 continue;
89 }
91 /* AND */
92 if (p[0] == '&') {
93 ++p;
94 if(!found) {
95 p = skip(p);
96 } else {
97 found = FALSE;
98 }
99 continue;
100 }
102 /* EXPRESSION START */
103 if (p[0] == '[') {
104 temp = g_malloc0(max);
105 if( _strfsong(temp, max, p+1, song, &p) >0 ) {
106 g_strlcat(s, temp, max);
107 length = strlen(s);
108 found = TRUE;
109 }
110 g_free(temp);
111 continue;
112 }
114 /* EXPRESSION END */
115 if (p[0] == ']') {
116 if(last) *last = p+1;
117 if(!found && length) {
118 memset(s, 0, max);
119 length = 0;
120 }
121 return length;
122 }
124 /* pass-through non-escaped portions of the format string */
125 if (p[0] != '#' && p[0] != '%' && length<max) {
126 s[length++] = *p;
127 p++;
128 continue;
129 }
131 /* let the escape character escape itself */
132 if (p[0] == '#' && p[1] != '\0' && length<max) {
133 s[length++] = *(p+1);
134 p+=2;
135 continue;
136 }
138 /* advance past the esc character */
140 /* find the extent of this format specifier (stop at \0, ' ', or esc) */
141 temp = NULL;
142 end = p+1;
143 while(*end >= 'a' && *end <= 'z') {
144 end++;
145 }
146 n = end - p + 1;
147 if(*end != '%')
148 n--;
149 else if (strncmp("%file%", p, n) == 0)
150 temp = utf8_to_locale(mpd_song_get_uri(song));
151 else if (strncmp("%artist%", p, n) == 0)
152 temp = song_tag_locale(song, MPD_TAG_ARTIST);
153 else if (strncmp("%title%", p, n) == 0)
154 temp = song_tag_locale(song, MPD_TAG_TITLE);
155 else if (strncmp("%album%", p, n) == 0)
156 temp = song_tag_locale(song, MPD_TAG_ALBUM);
157 else if (strncmp("%shortalbum%", p, n) == 0) {
158 temp = song_tag_locale(song, MPD_TAG_ALBUM);
159 if (temp) {
160 gchar *temp2 = g_strndup(temp, 25);
161 if (strlen(temp) > 25) {
162 temp2[24] = '.';
163 temp2[23] = '.';
164 temp2[22] = '.';
165 }
166 g_free(temp);
167 temp = temp2;
168 }
169 }
170 else if (strncmp("%track%", p, n) == 0)
171 temp = song_tag_locale(song, MPD_TAG_TRACK);
172 else if (strncmp("%name%", p, n) == 0)
173 temp = song_tag_locale(song, MPD_TAG_NAME);
174 else if (strncmp("%date%", p, n) == 0)
175 temp = song_tag_locale(song, MPD_TAG_DATE);
176 else if (strncmp("%genre%", p, n) == 0)
177 temp = song_tag_locale(song, MPD_TAG_GENRE);
178 else if (strncmp("%shortfile%", p, n) == 0) {
179 const char *uri = mpd_song_get_uri(song);
180 if (strstr(uri, "://") != NULL)
181 temp = utf8_to_locale(uri);
182 else
183 temp = utf8_to_locale(g_basename(uri));
184 } else if (strncmp("%time%", p, n) == 0) {
185 unsigned duration = mpd_song_get_duration(song);
187 if (duration > 0) {
188 char buffer[32];
189 format_duration_short(buffer, sizeof(buffer),
190 duration);
191 temp = g_strdup(buffer);
192 }
193 }
195 if( temp == NULL) {
196 gsize templen=n;
197 /* just pass-through any unknown specifiers (including esc) */
198 /* drop a null char in so printf stops at the end of this specifier,
199 but put the real character back in (pseudo-const) */
200 if( length+templen > max )
201 templen = max-length;
202 g_strlcat(s, p,max);
203 length+=templen;
204 } else {
205 gsize templen = strlen(temp);
207 found = TRUE;
208 if( length+templen > max )
209 templen = max-length;
210 g_strlcat(s, temp, max);
211 length+=templen;
212 g_free(temp);
213 }
215 /* advance past the specifier */
216 p += n;
217 }
219 if(last) *last = p;
221 return length;
222 }
224 gsize
225 strfsong(gchar *s, gsize max, const gchar *format,
226 const struct mpd_song *song)
227 {
228 return _strfsong(s, max, format, song, NULL);
229 }