void TagGuesser::guessTags(MPDSong &song) {
QString pattern = Config::instance()->guessPattern();
// Check that we have a pattern at all
if (pattern.isEmpty())
return;
// Cant guess from URL's
if (song.url().contains("://"))
return;
// Return if we already have everything we can guess
if (!(song.title().isEmpty() || song.album().isEmpty() || song.artist().isEmpty() || song.track().isEmpty()))
return;
DEBUG4("Guessing..");
// Tokens to expand. %a=album, %b=band, %n=tracknr, %t=title, %i=ignore
QStringList matchers = pattern.split(QRegExp("%[abnti]"), QString::SkipEmptyParts);
QStringList markers = pattern.split('%', QString::SkipEmptyParts);
// Check that we actually have any matchers, if not, return filename as title, the rest empty.
DEBUG4("Matchers size: %d %d", matchers.size(), markers.size());
if (matchers.isEmpty() || markers.isEmpty()) {
DEBUG4("No matchers or no markers");
if (song.title().isEmpty())
song.setTitle(song.url());
return;
}
// Remove bogus markers
DEBUG4("Removing bogus markers");
markers = markers.filter(QRegExp("^[abnti]"));
// Remove trailing garbage on markers
DEBUG4("Removing trailing garbage on markers");
markers = markers.replaceInStrings(QRegExp("^([abnti]).*"), "%\\1");
DEBUG4("Adding greedy front matcher");
// If pattern does not have leading characters, add a greedy matcher at front so we get the whole start
if (pattern.contains(QRegExp("^%[abnti]")))
matchers.push_front("^");
// If pattern contains trailing characters, add a dummy marker at the end.
DEBUG4("Finding last matcher");
QString lastMarker = markers.last();
DEBUG4("Finding end of last marker");
int endOfLastMatcher = pattern.lastIndexOf(lastMarker) + lastMarker.size();
DEBUG4("Adding dummy end marker");
if (endOfLastMatcher < pattern.size())
markers += "trailingcharacters";
foreach (QString p, markers) {
DEBUG4("marker : %s", qPrintable(p));
}
