src/libmpd-strfsong.c

   1 /*
   2  * $Id: strfsong.c 1502 2004-06-15 15:32:18Z kaw $
   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  *              and Qball Cow (Qball@qballcow.nl)
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include "libmpd.h"
  32 #include "libmpd-internal.h"
  33
  34 static char * skip(char * p)
  35 {
  36         int stack = 0;
  37
  38         while (*p != '\0') {
  39                 if(*p == '[') stack++;
  40                 if(*p == '#' && p[1] != '\0') {
  41                         /* skip escaped stuff */
  42                         ++p;
  43                 }
  44                 else if(stack) {
  45                         if(*p == ']') stack--;
  46                 }
  47                 else {
  48                         if(*p == '&' || *p == '|' || *p == ']') {
  49                                 break;
  50                         }
  51                 }
  52                 ++p;
  53         }
  54
  55         return p;
  56 }
  57
  58 static unsigned int _strfsong(char *s,
  59                 unsigned int max,
  60                 const char *format,
  61                 mpd_Song *song,
  62                 char **last)
  63 {
  64         char *p, *end;
  65         char *temp;
  66         unsigned int n, length = 0;
  67         int i;
  68         short int found = FALSE;
  69
  70         memset(s, 0, max);
  71         if( song==NULL )
  72                 return 0;
  73
  74         for( p=(char *) format; *p != '\0' && length<max; )
  75         {
  76                 /* OR */
  77                 if (p[0] == '|')
  78                 {
  79                         ++p;
  80                         if(!found)
  81                         {
  82                                 memset(s, 0, max);
  83                                 length = 0;
  84                         }
  85                         else
  86                         {
  87                                 p = skip(p);
  88                         }
  89                         continue;
  90                 }
  91
  92                 /* AND */
  93                 if (p[0] == '&')
  94                 {
  95                         ++p;
  96                         if(!found)
  97                         {
  98                                 p = skip(p);
  99                         }
 100                         else
 101                         {
 102                                 found = FALSE;
 103                         }
 104                         continue;
 105                 }
 106
 107                 /* EXPRESSION START */
 108                 if (p[0] == '[')
 109                 {
 110                         temp = malloc(max);
 111                         memset(temp, 0,max);
 112                         if( _strfsong(temp, max, p+1, song, &p) >0 )
 113                         {
 114                                 strncat(s, temp, max-length);
 115                                 length = strlen(s);
 116                                 found = TRUE;
 117                         }
 118                         free(temp);
 119                         continue;
 120                 }
 121
 122                 /* EXPRESSION END */
 123                 if (p[0] == ']')
 124                 {
 125                         if(last) *last = p+1;
 126                         if(!found && length)
 127                         {
 128                                 memset(s, 0, max);
 129                                 length = 0;
 130                         }
 131                         return length;
 132                 }
 133
 134                 /* pass-through non-escaped portions of the format string */
 135                 if (p[0] != '#' && p[0] != '%' && length<max)
 136                 {
 137                         strncat(s, p, 1);
 138                         length++;
 139                         ++p;
 140                         continue;
 141                 }
 142
 143                 /* let the escape character escape itself */
 144                 if (p[0] == '#' && p[1] != '\0' && length<max)
 145                 {
 146                         strncat(s, p+1, 1);
 147                         length++;
 148                         p+=2;
 149                         continue;
 150                 }
 151
 152                 /* advance past the esc character */
 153
 154                 /* find the extent of this format specifier (stop at \0, ' ', or esc) */
 155                 temp = NULL;
 156                 end  = p+1;
 157                 while(*end >= 'a' && *end <= 'z')
 158                 {
 159                         end++;
 160                 }
 161                 n = end - p + 1;
 162                 if(*end != '%')
 163                         n--;
 164                 else if (memcmp("%file%", p, n) == 0)
 165                         temp = strdup(song->file);
 166                 else if (memcmp("%artist%", p, n) == 0)
 167                         temp = song->artist ? strdup(song->artist) : NULL;
 168                 else if (memcmp("%title%", p, n) == 0)
 169                         temp = song->title ? strdup(song->title) : NULL;
 170                 else if (memcmp("%album%", p, n) == 0)
 171                         temp = song->album ? strdup(song->album) : NULL;
 172                 else if (memcmp("%track%", p, n) == 0)
 173                         temp = song->track ? strdup(song->track) : NULL;
 174                 else if (memcmp("%name%", p, n) == 0)
 175                         temp = song->name ? strdup(song->name) : NULL;
 176                 else if (memcmp("%date%", p, n) == 0)
 177                         temp = song->date ? strdup(song->date) : NULL;
 178                 else if (memcmp("%genre%", p, n) == 0)
 179                         temp = song->genre ? strdup(song->genre) : NULL;
 180                 else if (memcmp("%performer%", p, n) == 0)
 181                         temp = song->performer ? strdup(song->performer) : NULL;
 182                 else if (memcmp("%composer%", p, n) == 0)
 183                         temp = song->composer ? strdup(song->composer) : NULL;
 184                 else if (memcmp("%track%",p,n) == 0)
 185                         temp = song->track? strdup(song->track): NULL;
 186                 else if (memcmp("%comment%", p, n) == 0)
 187                         temp = song->comment? strdup(song->comment): NULL;
 188                 else if (memcmp("%plpos%", p, n) == 0 || memcmp("%songpos%",p,n) == 0){
 189                         temp = NULL;
 190                         if(song->pos >= 0){
 191                                 char str[32];
 192                                 int length;
 193                                 if((length = snprintf(str,32, "%i", song->pos)) >=0)
 194                                 {
 195                                         temp = strndup(str,length);
 196                                 }
 197                         }
 198                 }
 199                 else if (memcmp("%shortfile%", p, n) == 0)
 200                 {
 201                         if( strstr(song->file, "://") )
 202                                 temp = strdup(song->file);
 203                         else {
 204                                 int i=strlen(song->file);
 205                                 int ext =0;
 206                                 for(;i>=0 && (song->file[i] != '/' && song->file[i] != '\\');i--){
 207                                         if(song->file[i] == '.' && !ext) ext = i;
 208                                 }
 209                                 temp = strndup(&(song->file)[i+1],ext-i-1);
 210                         }
 211                 }
 212                 else if (memcmp("%time%", p, n) == 0)
 213                 {
 214                         temp = NULL;
 215                         if (song->time != MPD_SONG_NO_TIME) {
 216                                 char str[32];
 217                                 int length;
 218                                 if((length = snprintf(str,32, "%02d:%02d", song->time/60, song->time%60))>=0)
 219                                 {
 220                                         temp = strndup(str,length);
 221                                 }
 222                         }
 223                 }
 224         else if (memcmp("%disc%", p, n) == 0)
 225         {
 226                         temp = song->disc? strdup(song->disc) : NULL;
 227         }
 228         if(temp != NULL) {
 229             unsigned int templen = strlen(temp);
 230             found = TRUE;
 231             if( length+templen > max )
 232                 templen = max-length;
 233             strncat(s, temp, templen);
 234             length+=templen;
 235             free(temp);
 236         }
 237
 238         /* advance past the specifier */
 239         p += n;
 240     }
 241
 242     for(i=0; i < length;i++)
 243     {
 244         if(s[i] == '_') s[i] = ' ';
 245     }
 246
 247     if(last) *last = p;
 248
 249     return length;
 250 }
 251
 252 unsigned int mpd_song_markup(char *s, unsigned int max,const char *format, mpd_Song *song)
 253 {
 254     return _strfsong(s, max, format, song, NULL);
 255 }
 256