src/strfsong.c

   1 /*
   2  * $Id$
   3  *
   4  * Based on mpc's songToFormatedString modified for glib and ncmpc
   5  *
   6  *
   7  * (c) 2003-2004 by normalperson and Warren Dukes (shank@mercury.chem.pitt.edu)
   8  *              and Daniel Brown (danb@cs.utexas.edu)
   9  *              and Kalle Wallin (kaw@linux.se)
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "strfsong.h"
  26 #include "support.h"
  27 #include "charset.h"
  28
  29 #include <string.h>
  30
  31 static const gchar *
  32 skip(const gchar * p)
  33 {
  34         gint stack = 0;
  35
  36         while (*p != '\0') {
  37                 if(*p == '[') stack++;
  38                 if(*p == '#' && p[1] != '\0') {
  39                         /* skip escaped stuff */
  40                         ++p;
  41                 } else if(stack) {
  42                         if(*p == ']') stack--;
  43                 } else {
  44                         if(*p == '&' || *p == '|' || *p == ']') {
  45                                 break;
  46                         }
  47                 }
  48                 ++p;
  49         }
  50
  51         return p;
  52 }
  53
  54 static gsize
  55 _strfsong(gchar *s,
  56           gsize max,
  57           const gchar *format,
  58           const struct mpd_song *song,
  59           const gchar **last)
  60 {
  61         const gchar *p, *end;
  62         gchar *temp;
  63         gsize n, length = 0;
  64         gboolean found = FALSE;
  65
  66         memset(s, 0, max);
  67         if( song==NULL )
  68                 return 0;
  69
  70         for (p = format; *p != '\0' && length<max;) {
  71                 /* OR */
  72                 if (p[0] == '|') {
  73                         ++p;
  74                         if(!found) {
  75                                 memset(s, 0, max);
  76                                 length = 0;
  77                         } else {
  78                                 p = skip(p);
  79                         }
  80                         continue;
  81                 }
  82
  83                 /* AND */
  84                 if (p[0] == '&') {
  85                         ++p;
  86                         if(!found) {
  87                                 p = skip(p);
  88                         } else {
  89                                 found = FALSE;
  90                         }
  91                         continue;
  92                 }
  93
  94                 /* EXPRESSION START */
  95                 if (p[0] == '[') {
  96                         temp = g_malloc0(max);
  97                         if( _strfsong(temp, max, p+1, song, &p) >0 ) {
  98                                 g_strlcat(s, temp, max);
  99                                 length = strlen(s);
 100                                 found = TRUE;
 101                         }
 102                         g_free(temp);
 103                         continue;
 104                 }
 105
 106                 /* EXPRESSION END */
 107                 if (p[0] == ']') {
 108                         if(last) *last = p+1;
 109                         if(!found && length) {
 110                                 memset(s, 0, max);
 111                                 length = 0;
 112                         }
 113                         return length;
 114                 }
 115
 116                 /* pass-through non-escaped portions of the format string */
 117                 if (p[0] != '#' && p[0] != '%' && length<max) {
 118                         s[length++] = *p;
 119                         p++;
 120                         continue;
 121                 }
 122
 123                 /* let the escape character escape itself */
 124                 if (p[0] == '#' && p[1] != '\0' && length<max) {
 125                         s[length++] = *(p+1);
 126                         p+=2;
 127                         continue;
 128                 }
 129
 130                 /* advance past the esc character */
 131
 132                 /* find the extent of this format specifier (stop at \0, ' ', or esc) */
 133                 temp = NULL;
 134                 end  = p+1;
 135                 while(*end >= 'a' && *end <= 'z') {
 136                         end++;
 137                 }
 138                 n = end - p + 1;
 139                 if(*end != '%')
 140                         n--;
 141                 else if (strncmp("%file%", p, n) == 0)
 142                         temp = utf8_to_locale(song->file);
 143                 else if (strncmp("%artist%", p, n) == 0)
 144                         temp = song->artist ? utf8_to_locale(song->artist) : NULL;
 145                 else if (strncmp("%title%", p, n) == 0)
 146                         temp = song->title ? utf8_to_locale(song->title) : NULL;
 147                 else if (strncmp("%album%", p, n) == 0)
 148                         temp = song->album ? utf8_to_locale(song->album) : NULL;
 149                 else if (strncmp("%shortalbum%", p, n) == 0) {
 150                         temp = song->album ? utf8_to_locale(song->album) : NULL;
 151                         if (temp) {
 152                                 gchar *temp2 = g_strndup(temp, 25);
 153                                 if (strlen(temp) > 25) {
 154                                         temp2[24] = '.';
 155                                         temp2[23] = '.';
 156                                         temp2[22] = '.';
 157                                 }
 158                                 g_free(temp);
 159                                 temp = temp2;
 160                         }
 161                 }
 162                 else if (strncmp("%track%", p, n) == 0)
 163                         temp = song->track ? utf8_to_locale(song->track) : NULL;
 164                 else if (strncmp("%name%", p, n) == 0)
 165                         temp = song->name ? utf8_to_locale(song->name) : NULL;
 166                 else if (strncmp("%date%", p, n) == 0)
 167                         temp = song->date ? utf8_to_locale(song->date) : NULL;
 168                 else if (strncmp("%genre%", p, n) == 0)
 169                         temp = song->genre ? utf8_to_locale(song->genre) : NULL;
 170                 else if (strncmp("%shortfile%", p, n) == 0) {
 171                         if( strstr(song->file, "://") )
 172                                 temp = utf8_to_locale(song->file);
 173                         else
 174                                 temp = utf8_to_locale(basename(song->file));
 175                 } else if (strncmp("%time%", p, n) == 0) {
 176                         if (song->time != MPD_SONG_NO_TIME)  {
 177                                 if (song->time > 3600) {
 178                                         temp = g_strdup_printf("%d:%02d:%02d",
 179                                                                song->time / 3600,
 180                                                                (song->time % 3600) / 60,
 181                                                                song->time % 60);
 182                                 } else {
 183                                         temp = g_strdup_printf("%d:%02d",
 184                                                                song->time / 60,
 185                                                                song->time % 60);
 186                                 }
 187                         }
 188                 }
 189
 190                 if( temp == NULL) {
 191                         gsize templen=n;
 192                         /* just pass-through any unknown specifiers (including esc) */
 193                         /* drop a null char in so printf stops at the end of this specifier,
 194                            but put the real character back in (pseudo-const) */
 195                         if( length+templen > max )
 196                                 templen = max-length;
 197                         g_strlcat(s, p,max);
 198                         length+=templen;
 199                 } else {
 200                         gsize templen = strlen(temp);
 201
 202                         found = TRUE;
 203                         if( length+templen > max )
 204                                 templen = max-length;
 205                         g_strlcat(s, temp, max);
 206                         length+=templen;
 207                         g_free(temp);
 208                 }
 209
 210                 /* advance past the specifier */
 211                 p += n;
 212         }
 213
 214         if(last) *last = p;
 215
 216         return length;
 217 }
 218
 219 gsize
 220 strfsong(gchar *s, gsize max, const gchar *format,
 221          const struct mpd_song *song)
 222 {
 223   return _strfsong(s, max, format, song, NULL);
 224 }
 225