Add %art_url formatting placeholder

src/main.c

@@ -29,6 +29,7 @@
 "Artist:\t\t" ARG_INFO_ARTIST_NAME "\n" \
 "Album:\t\t" ARG_INFO_ALBUM_NAME "\n" \
 "Album Artist:\t" ARG_INFO_ALBUM_ARTIST "\n" \
+"Art URL:\t" ARG_INFO_ART_URL "\n" \
 "Track:\t\t" ARG_INFO_TRACK_NUMBER "\n" \
 "Length:\t\t" ARG_INFO_TRACK_LENGTH "\n" \
 "Volume:\t\t" ARG_INFO_VOLUME "\n" \
@@ -46,6 +47,7 @@
 #define ARG_INFO_ARTIST_NAME     "%artist_name"
 #define ARG_INFO_ALBUM_NAME      "%album_name"
 #define ARG_INFO_ALBUM_ARTIST    "%album_artist"
+#define ARG_INFO_ART_URL         "%art_url"
 #define ARG_INFO_BITRATE         "%bitrate"
 #define ARG_INFO_COMMENT         "%comment"
 
@@ -82,6 +84,7 @@
 "\t%" ARG_INFO_ARTIST_NAME "\tprints the artist name\n" \
 "\t%" ARG_INFO_ALBUM_NAME "\tprints the album name\n" \
 "\t%" ARG_INFO_ALBUM_ARTIST "\tprints the album artist\n" \
+"\t%" ARG_INFO_ART_URL "\tprints the URL of the cover art image\n" \
 "\t%" ARG_INFO_PLAYBACK_STATUS "\tprints the playback status\n" \
 "\t%" ARG_INFO_SHUFFLE_MODE "\tprints the shuffle mode\n" \
 "\t%" ARG_INFO_VOLUME "\t\tprints the volume\n" \
@@ -197,6 +200,7 @@ void print_mpris_info(mpris_properties *props, char* format)
     output = str_replace(output, ARG_INFO_TRACK_NUMBER, track_number_label);
     output = str_replace(output, ARG_INFO_BITRATE, bitrate_label);
     output = str_replace(output, ARG_INFO_COMMENT, props->metadata.comment);
+    output = str_replace(output, ARG_INFO_ART_URL, props->metadata.url);
 
     fprintf(stdout, "%s\n", output);
     free(output);