Add option to set prefixes to ignore when sorting (e.g. 'The')

#706

db/librarydb.cpp

@@ -349,20 +349,45 @@ static bool songsSortArAl(const Song &a, const Song &b)
 //    return a.lastModified>b.lastModified;
 //}
 
+static QStringList prefixesToIngore=QStringList() << QLatin1String("The");
+
+QStringList LibraryDb::ignorePrefixes()
+{
+    return prefixesToIngore;
+}
+
+void LibraryDb::setIgnorePrefixes(const QStringList &prefixes)
+{
+    prefixesToIngore=prefixes;
+}
+
+static QString ignorePrefix(const QString &str)
+{
+    foreach (const QString &p, prefixesToIngore) {
+        if (str.startsWith(p+QLatin1Char(' '))) {
+            return str.mid(p.length()+1);
+        }
+    }
+    return QString();
+}
+
+static QString sortString(const QString &str)
+{
+    QString sort=ignorePrefix(str);
+
+    if (sort.isEmpty()) {
+        sort=str;
+    }
+    sort=sort.remove('.');
+    return sort==str ? QString() : sort;
+}
+
 static QString artistSort(const Song &s)
 {
     if (!s.artistSortString().isEmpty()) {
         return s.artistSortString();
     }
-    const QString &albumArtist=s.albumArtist();
-    QString sort;
-    if (albumArtist.startsWith("The ")) {
-        sort=albumArtist.mid(4);
-    } else {
-        sort=albumArtist;
-    }
-    sort=sort.remove('.');
-    return sort==albumArtist ? QString() : sort;
+    return sortString(s.albumArtist());
 }
 
 static QString albumSort(const Song &s)
@@ -370,14 +395,7 @@ static QString albumSort(const Song &s)
     if (!s.albumSort().isEmpty()) {
         return s.albumSort();
     }
-    QString sort;
-    if (s.album.startsWith("The ")) {
-        sort=s.album.mid(4);
-    } else {
-        sort=s.album;
-    }
-    sort=sort.remove('.');
-    return sort==s.album ? QString() : sort;
+    return sortString(s.album);
 }
 
 // Code taken from Clementine's LibraryQuery