fix(autoGroupByFolder): prepend upper level folder name when two

groups share same name but in different folder

src/ui/groups_widgets.cc

@@ -780,6 +780,12 @@ void DictGroupsWidget::addAutoGroupsByFolders()
     return;
   }
 
+  auto cdUpWentWrong = [ this ]( const QString & path ) {
+    QMessageBox::warning( this,
+                          tr( "Auto group by folder failed." ),
+                          tr( "The parent directory of %1 can be reached." ).arg( path ) );
+  };
+
   if ( QMessageBox::information( this,
                                  tr( "Confirmation" ),
                                  tr( "Are you sure you want to generate a set of groups "
@@ -790,26 +796,74 @@ void DictGroupsWidget::addAutoGroupsByFolders()
     return;
   }
 
-  QMultiMap< QString, sptr< Dictionary::Class > > dictMap;
+  // Map from dict to ContainerFolder's parent
+  QMap< sptr< Dictionary::Class >, QString > dictToContainerFolder;
 
   for ( const auto & dict : *activeDicts ) {
-    QString dictFolder = dict->getContainingFolder();
+    QDir c = dict->getContainingFolder();
 
-    if ( dictFolder.isEmpty() ) {
-      continue;
+    if ( !c.cdUp() ) {
+      cdUpWentWrong( c.absolutePath() );
+      return;
     }
 
-    QDir dir = dictFolder;
-    if ( dir.cdUp() ) {
-      dictMap.insert( dir.dirName(), dict );
+    dictToContainerFolder.insert( dict, c.absolutePath() );
+  }
+
+  /*
+  Check for duplicated ContainerFolder's parent folder names, and prepend the upper parent's name.
+
+  .
+  ├─epistularum
+  │   └─Japanese   <- Group
+  │       └─DictA  <- Dict Files's container folder
+  |          └─ DictA Files
+  ├─Mastameta
+  │   └─Japanese   <- Group
+  |       └─DictB  <- Dict Files's container folder
+  |          └─ DictB Files
+
+  will be grouped into epistularum/Japanese and Mastameta/Japanese
+  */
+
+  // set a dirname to true if there are duplications like `epistularum/Japanese` and `Mastameta/Japanese`
+  QHash< QString, bool > dirNeedPrepend{};
+
+  for ( const auto & path : dictToContainerFolder.values() ) {
+    auto dir = QDir( path );
+    if ( dirNeedPrepend.contains( dir.dirName() ) ) {
+      dirNeedPrepend[ dir.dirName() ] = true;
     }
     else {
-      qWarning() << "Cannot auto group because parent folder cannot be reached: " << dir;
-      continue;
+      dirNeedPrepend.insert( dir.dirName(), false );
     }
   }
 
-  for ( const auto & group : dictMap.uniqueKeys() ) {
+  // map from GroupName to dicts
+  QMultiMap< QString, sptr< Dictionary::Class > > groupToDicts;
+
+  for ( const auto & dict : dictToContainerFolder.keys() ) {
+    QDir path = dictToContainerFolder[ dict ];
+    QString groupName;
+    if ( !dirNeedPrepend[ path.dirName() ] ) {
+      groupName = path.dirName();
+    }
+    else {
+      QString directFolder = path.dirName();
+      if ( !path.cdUp() ) {
+        cdUpWentWrong( path.absolutePath() );
+        return;
+      }
+      QString upperFolder = path.dirName();
+      groupName           = upperFolder + "/" + directFolder;
+    }
+
+    groupToDicts.insert( groupName, dict );
+  }
+
+  // create and insert groups
+  // modifying user's groups begins here
+  for ( const auto & group : groupToDicts.uniqueKeys() ) {
     if ( count() != 0 ) {
       setCurrentIndex( count() - 1 );
     }
@@ -817,7 +871,7 @@ void DictGroupsWidget::addAutoGroupsByFolders()
     addUniqueGroup( group );
     DictListModel * model = getCurrentModel();
 
-    for ( auto dict : dictMap.values( group ) ) {
+    for ( const auto& dict : groupToDicts.values( group ) ) {
       model->addRow( QModelIndex(), dict );
     }
   }

website/docs/manage_groups.md

@@ -35,4 +35,20 @@ For example, the structure below will be auto grouped into two groups:
     └── zim
         ├── Wikipedia_ru.slob
         └── Wikipedia.zim
+```
+
+Note that if two groups share the same name but in different folder, then upper level's folder name will be prepended with group name. The Example below will be grouped into `epistularum/Japanese` and `Mastameta/Japanese`.
+
+More levels of folder nesting are not supported.
+
+```
+.
+├─epistularum
+│   └─Japanese   <- Group
+│       └─DictA  <- Dict Files's container folder
+|          └─ DictA Files
+├─Mastameta
+│   └─Japanese   <- Group
+|       └─DictB  <- Dict Files's container folder
+|          └─ DictB Files  
 ```