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
  28 #include <string.h>
  29
  30 static const gchar *
  31 skip(const gchar * p)
  32 {
  33         gint stack = 0;
  34
  35         while (*p != '\0') {
  36                 if(*p == '[') stack++;
  37                 if(*p == '#' && p[1] != '\0') {
  38                         /* skip escaped stuff */
  39                         ++p;
  40                 } else if(stack) {
  41                         if(*p == ']') stack--;
  42                 } else {
  43                         if(*p == '&' || *p == '|' || *p == ']') {
  44                                 break;
  45                         }
  46                 }
  47                 ++p;
  48         }
  49
  50         return p;
  51 }
  52
  53 static gsize
  54 _strfsong(gchar *s,
  55           gsize max,
  56           const gchar *format,
  57           mpd_Song *song,
  58           const gchar **last)
  59 {
  60         const gchar *p, *end;
  61         gchar *temp;
  62         gsize n, length = 0;
  63         gboolean found = FALSE;
  64
  65         memset(s, 0, max);
  66         if( song==NULL )
  67                 return 0;
  68
  69         for (p = format; *p != '\0' && length<max;) {
  70                 /* OR */
  71                 if (p[0] == '|') {
  72                         ++p;
  73                         if(!found) {
  74                                 memset(s, 0, max);
  75                                 length = 0;
  76                         } else {
  77                                 p = skip(p);
  78                         }
  79                         continue;
  80                 }
  81
  82                 /* AND */
  83                 if (p[0] == '&') {
  84                         ++p;
  85                         if(!found) {
  86                                 p = skip(p);
  87                         } else {
  88                                 found = FALSE;
  89                         }
  90                         continue;
  91                 }
  92
  93                 /* EXPRESSION START */
  94                 if (p[0] == '[') {
  95                         temp = g_malloc0(max);
  96                         if( _strfsong(temp, max, p+1, song, &p) >0 ) {
  97                                 g_strlcat(s, temp, max);
  98                                 length = strlen(s);
  99                                 found = TRUE;
 100                         }
 101                         g_free(temp);
 102                         continue;
 103                 }
 104
 105                 /* EXPRESSION END */
 106                 if (p[0] == ']') {
 107                         if(last) *last = p+1;
 108                         if(!found && length) {
 109                                 memset(s, 0, max);
 110                                 length = 0;
 111                         }
 112                         return length;
 113                 }
 114
 115                 /* pass-through non-escaped portions of the format string */
 116                 if (p[0] != '#' && p[0] != '%' && length<max) {
 117                         s[length++] = *p;
 118                         p++;
 119                         continue;
 120                 }
 121
 122                 /* let the escape character escape itself */
 123                 if (p[0] == '#' && p[1] != '\0' && length<max) {
 124                         s[length++] = *(p+1);
 125                         p+=2;
 126                         continue;
 127                 }
 128
 129                 /* advance past the esc character */
 130
 131                 /* find the extent of this format specifier (stop at \0, ' ', or esc) */
 132                 temp = NULL;
 133                 end  = p+1;
 134                 while(*end >= 'a' && *end <= 'z') {
 135                         end++;
 136                 }
 137                 n = end - p + 1;
 138                 if(*end != '%')
 139                         n--;
 140                 else if (strncmp("%file%", p, n) == 0)
 141                         temp = utf8_to_locale(song->file);
 142                 else if (strncmp("%artist%", p, n) == 0)
 143                         temp = song->artist ? utf8_to_locale(song->artist) : NULL;
 144                 else if (strncmp("%title%", p, n) == 0)
 145                         temp = song->title ? utf8_to_locale(song->title) : NULL;
 146                 else if (strncmp("%album%", p, n) == 0)
 147                         temp = song->album ? utf8_to_locale(song->album) : NULL;
 148                 else if (strncmp("%shortalbum%", p, n) == 0) {
 149                         temp = song->album ? utf8_to_locale(song->album) : NULL;
 150                         if (temp) {
 151                                 gchar *temp2 = g_strndup(temp, 25);
 152                                 if (strlen(temp) > 25) {
 153                                         temp2[24] = '.';
 154                                         temp2[23] = '.';
 155                                         temp2[22] = '.';
 156                                 }
 157                                 g_free(temp);
 158                                 temp = temp2;
 159                         }
 160                 }
 161                 else if (strncmp("%track%", p, n) == 0)
 162                         temp = song->track ? utf8_to_locale(song->track) : NULL;
 163                 else if (strncmp("%name%", p, n) == 0)
 164                         temp = song->name ? utf8_to_locale(song->name) : NULL;
 165                 else if (strncmp("%date%", p, n) == 0)
 166                         temp = song->date ? utf8_to_locale(song->date) : NULL;
 167                 else if (strncmp("%genre%", p, n) == 0)
 168                         temp = song->genre ? utf8_to_locale(song->genre) : NULL;
 169                 else if (strncmp("%shortfile%", p, n) == 0) {
 170                         if( strstr(song->file, "://") )
 171                                 temp = utf8_to_locale(song->file);
 172                         else
 173                                 temp = utf8_to_locale(basename(song->file));
 174                 } else if (strncmp("%time%", p, n) == 0) {
 175                         if (song->time != MPD_SONG_NO_TIME)  {
 176                                 if (song->time > 3600) {
 177                                         temp = g_strdup_printf("%d:%02d:%02d",
 178                                                                song->time / 3600,
 179                                                                (song->time % 3600) / 60,
 180                                                                song->time % 60);
 181                                 } else {
 182                                         temp = g_strdup_printf("%d:%02d",
 183                                                                song->time / 60,
 184                                                                song->time % 60);
 185                                 }
 186                         }
 187                 }
 188
 189                 if( temp == NULL) {
 190                         gsize templen=n;
 191                         /* just pass-through any unknown specifiers (including esc) */
 192                         /* drop a null char in so printf stops at the end of this specifier,
 193                            but put the real character back in (pseudo-const) */
 194                         if( length+templen > max )
 195                                 templen = max-length;
 196                         g_strlcat(s, p,max);
 197                         length+=templen;
 198                 } else {
 199                         gsize templen = strlen(temp);
 200
 201                         found = TRUE;
 202                         if( length+templen > max )
 203                                 templen = max-length;
 204                         g_strlcat(s, temp, max);
 205                         length+=templen;
 206                         g_free(temp);
 207                 }
 208
 209                 /* advance past the specifier */
 210                 p += n;
 211         }
 212
 213         if(last) *last = p;
 214
 215         return length;
 216 }
 217
 218 gsize
 219 strfsong(gchar *s, gsize max, const gchar *format, mpd_Song *song)
 220 {
 221   return _strfsong(s, max, format, song, NULL);
 222 }
 223