src/strfsong.c

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2017 The Music Player Daemon Project
   3  * Project homepage: http://musicpd.org
   4  *
   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.
   9  *
  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.
  14  *
  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  */
  19
  20 #include "strfsong.h"
  21 #include "charset.h"
  22 #include "time_format.h"
  23
  24 #include <mpd/client.h>
  25
  26 #include <string.h>
  27
  28 static const gchar *
  29 skip(const gchar * p)
  30 {
  31         gint stack = 0;
  32
  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         }
  48
  49         return p;
  50 }
  51
  52 #ifndef NCMPC_MINI
  53
  54 static char *
  55 concat_tag_values(const char *a, const char *b)
  56 {
  57         return g_strconcat(a, ", ", b, NULL);
  58 }
  59
  60 static char *
  61 song_more_tag_values(const struct mpd_song *song, enum mpd_tag_type tag,
  62                      const char *first)
  63 {
  64         const char *p = mpd_song_get_tag(song, tag, 1);
  65         if (p == NULL)
  66                 return NULL;
  67
  68         char *buffer = concat_tag_values(first, p);
  69         for (unsigned i = 2; (p = mpd_song_get_tag(song, tag, i)) != NULL;
  70              ++i) {
  71                 char *prev = buffer;
  72                 buffer = concat_tag_values(buffer, p);
  73                 g_free(prev);
  74         }
  75
  76         return buffer;
  77 }
  78
  79 #endif /* !NCMPC_MINI */
  80
  81 static char *
  82 song_tag_locale(const struct mpd_song *song, enum mpd_tag_type tag)
  83 {
  84         const char *value = mpd_song_get_tag(song, tag, 0);
  85         if (value == NULL)
  86                 return NULL;
  87
  88 #ifndef NCMPC_MINI
  89         char *all = song_more_tag_values(song, tag, value);
  90         if (all != NULL)
  91                 value = all;
  92 #endif /* !NCMPC_MINI */
  93
  94         char *result = utf8_to_locale(value);
  95
  96 #ifndef NCMPC_MINI
  97         g_free(all);
  98 #endif /* !NCMPC_MINI */
  99
 100         return result;
 101 }
 102
 103 static gsize
 104 _strfsong(gchar *s,
 105           gsize max,
 106           const gchar *format,
 107           const struct mpd_song *song,
 108           const gchar **last)
 109 {
 110         bool found = false;
 111         /* "missed" helps handling the case of mere literal text like
 112            found==true instead of found==false. */
 113         bool missed = false;
 114
 115         s[0] = '\0';
 116
 117         if (song == NULL)
 118                 return 0;
 119
 120         const char *p;
 121         size_t length = 0;
 122         for (p = format; *p != '\0' && length<max;) {
 123                 /* OR */
 124                 if (p[0] == '|') {
 125                         ++p;
 126                         if(missed && !found) {
 127                                 s[0] = '\0';
 128                                 length = 0;
 129                                 missed = false;
 130                         } else {
 131                                 p = skip(p);
 132                         }
 133                         continue;
 134                 }
 135
 136                 /* AND */
 137                 if (p[0] == '&') {
 138                         ++p;
 139                         if(missed && !found) {
 140                                 p = skip(p);
 141                         } else {
 142                                 found = false;
 143                                 missed = false;
 144                         }
 145                         continue;
 146                 }
 147
 148                 /* EXPRESSION START */
 149                 if (p[0] == '[') {
 150                         char *temp = g_malloc0(max);
 151                         if( _strfsong(temp, max, p+1, song, &p) >0 ) {
 152                                 g_strlcat(s, temp, max);
 153                                 length = strlen(s);
 154                                 found = true;
 155                         } else {
 156                                 missed = true;
 157                         }
 158                         g_free(temp);
 159                         continue;
 160                 }
 161
 162                 /* EXPRESSION END */
 163                 if (p[0] == ']') {
 164                         if(last) *last = p+1;
 165                         if(missed && !found && length) {
 166                                 s[0] = '\0';
 167                                 length = 0;
 168                         }
 169                         return length;
 170                 }
 171
 172                 /* pass-through non-escaped portions of the format string */
 173                 if (p[0] != '#' && p[0] != '%' && length<max) {
 174                         s[length++] = *p;
 175                         s[length] = '\0';
 176                         p++;
 177                         continue;
 178                 }
 179
 180                 /* let the escape character escape itself */
 181                 if (p[0] == '#' && p[1] != '\0' && length<max) {
 182                         s[length++] = *(p+1);
 183                         s[length] = '\0';
 184                         p+=2;
 185                         continue;
 186                 }
 187
 188                 /* advance past the esc character */
 189
 190                 /* find the extent of this format specifier (stop at \0, ' ', or esc) */
 191                 char *temp = NULL;
 192                 const char *end = p + 1;
 193                 while(*end >= 'a' && *end <= 'z') {
 194                         end++;
 195                 }
 196                 size_t n = end - p + 1;
 197                 if(*end != '%')
 198                         n--;
 199                 else if (strncmp("%file%", p, n) == 0)
 200                         temp = utf8_to_locale(mpd_song_get_uri(song));
 201                 else if (strncmp("%artist%", p, n) == 0) {
 202                         temp = song_tag_locale(song, MPD_TAG_ARTIST);
 203                         if (temp == NULL) {
 204                                 temp = song_tag_locale(song, MPD_TAG_PERFORMER);
 205                                 if (temp == NULL)
 206                                         temp = song_tag_locale(song, MPD_TAG_COMPOSER);
 207                         }
 208                 } else if (strncmp("%albumartist", p, n) == 0)
 209                         temp = song_tag_locale(song, MPD_TAG_ALBUM_ARTIST);
 210                 else if (strncmp("%composer%", p, n) == 0)
 211                         temp = song_tag_locale(song, MPD_TAG_COMPOSER);
 212                 else if (strncmp("%performer%", p, n) == 0)
 213                         temp = song_tag_locale(song, MPD_TAG_PERFORMER);
 214                 else if (strncmp("%title%", p, n) == 0) {
 215                         temp = song_tag_locale(song, MPD_TAG_TITLE);
 216                         if (temp == NULL)
 217                                 temp = song_tag_locale(song, MPD_TAG_NAME);
 218                 } else if (strncmp("%album%", p, n) == 0)
 219                         temp = song_tag_locale(song, MPD_TAG_ALBUM);
 220                 else if (strncmp("%shortalbum%", p, n) == 0) {
 221                         temp = song_tag_locale(song, MPD_TAG_ALBUM);
 222                         if (temp) {
 223                                 gchar *temp2 = g_strndup(temp, 25);
 224                                 if (strlen(temp) > 25) {
 225                                         temp2[24] = '.';
 226                                         temp2[23] = '.';
 227                                         temp2[22] = '.';
 228                                 }
 229                                 g_free(temp);
 230                                 temp = temp2;
 231                         }
 232                 }
 233                 else if (strncmp("%track%", p, n) == 0)
 234                         temp = song_tag_locale(song, MPD_TAG_TRACK);
 235                 else if (strncmp("%disc%", p, n) == 0)
 236                         temp = song_tag_locale(song, MPD_TAG_DISC);
 237                 else if (strncmp("%name%", p, n) == 0)
 238                         temp = song_tag_locale(song, MPD_TAG_NAME);
 239                 else if (strncmp("%date%", p, n) == 0)
 240                         temp = song_tag_locale(song, MPD_TAG_DATE);
 241                 else if (strncmp("%genre%", p, n) == 0)
 242                         temp = song_tag_locale(song, MPD_TAG_GENRE);
 243                 else if (strncmp("%shortfile%", p, n) == 0) {
 244                         const char *uri = mpd_song_get_uri(song);
 245                         if (strstr(uri, "://") != NULL)
 246                                 temp = utf8_to_locale(uri);
 247                         else
 248                                 temp = utf8_to_locale(g_basename(uri));
 249                 } else if (strncmp("%time%", p, n) == 0) {
 250                         unsigned duration = mpd_song_get_duration(song);
 251
 252                         if (duration > 0)  {
 253                                 char buffer[32];
 254                                 format_duration_short(buffer, sizeof(buffer),
 255                                                       duration);
 256                                 temp = g_strdup(buffer);
 257                         }
 258                 }
 259
 260                 if( temp == NULL) {
 261                         gsize templen=n;
 262                         /* just pass-through any unknown specifiers (including esc) */
 263                         if( length+templen > max )
 264                                 templen = max-length;
 265                         gchar *ident = g_strndup(p, templen);
 266                         g_strlcat(s, ident, max);
 267                         length+=templen;
 268                         g_free(ident);
 269
 270                         missed = true;
 271                 } else {
 272                         gsize templen = strlen(temp);
 273
 274                         found = true;
 275                         if( length+templen > max )
 276                                 templen = max-length;
 277                         g_strlcat(s, temp, max);
 278                         length+=templen;
 279                         g_free(temp);
 280                 }
 281
 282                 /* advance past the specifier */
 283                 p += n;
 284         }
 285
 286         if(last) *last = p;
 287
 288         return length;
 289 }
 290
 291 gsize
 292 strfsong(gchar *s, gsize max, const gchar *format,
 293          const struct mpd_song *song)
 294 {
 295         return _strfsong(s, max, format, song, NULL);
 296 }
 297