Add ability to remove a format to bulk metadata edit dialog

src/calibre/gui2/dialogs/metadata_bulk.py

@@ -29,6 +29,11 @@ class MetadataBulkDialog(QDialog, Ui_MetadataBulkDialog):
             id, name = i
             self.series.addItem(name)
             
+        for f in self.db.all_formats():
+            self.remove_format.addItem(f)
+            
+        self.remove_format.setCurrentIndex(-1)
+            
         self.series.lineEdit().setText('')
         QObject.connect(self.series, SIGNAL('currentIndexChanged(int)'), self.series_changed)
         QObject.connect(self.series, SIGNAL('editTextChanged(QString)'), self.series_changed)
@@ -66,7 +71,11 @@ class MetadataBulkDialog(QDialog, Ui_MetadataBulkDialog):
                 self.db.unapply_tags(id, remove_tags)
             if self.write_series:
                 self.db.set_series(id, qstring_to_unicode(self.series.currentText()))
-        self.changed = True
+                
+            if self.remove_format.currentIndex() > -1:
+                self.db.remove_format(id, unicode(self.remove_format.currentText()), index_is_id=True)
+                
+            self.changed = True
     
     def series_changed(self):
         self.write_series = True

src/calibre/gui2/dialogs/metadata_bulk.ui

@@ -211,6 +211,19 @@
             </property>
            </widget>
           </item>
+          <item row="7" column="1" >
+           <widget class="QComboBox" name="remove_format" />
+          </item>
+          <item row="7" column="0" >
+           <widget class="QLabel" name="label_5" >
+            <property name="text" >
+             <string>Remove &amp;format:</string>
+            </property>
+            <property name="buddy" >
+             <cstring>remove_format</cstring>
+            </property>
+           </widget>
+          </item>
          </layout>
         </widget>
        </item>

src/calibre/library/database2.py

@@ -570,6 +570,12 @@ class LibraryDatabase2(LibraryDatabase):
             p.loadFromData(data)
             p.save(path)
             
+    def all_formats(self):
+        formats = self.conn.execute('SELECT format from data').fetchall()
+        if not formats:
+            return set([])
+        return set([f[0] for f in formats])
+    
     def formats(self, index, index_is_id=False):
         ''' Return available formats as a comma separated list or None if htere are no available formats '''
         id = index if index_is_id else self.id(index)