Prefer covers from source file for GUI based conversion.

src/libprs500/ebooks/lrf/__init__.py

@@ -105,6 +105,8 @@ def option_parser(usage):
                       help='Publisher')
     metadata.add_option('--cover', action='store', dest='cover', default=None, \
                         help='Path to file containing image to be used as cover')
+    metadata.add_option('--use-metadata-cover', action='store_true', default=False, 
+                        help='If there is a cover graphic detected in the source file, use that instead of the specified cover.')
      
     parser.add_option('-o', '--output', action='store', default=None, \
                       help='Output file name. Default is derived from input filename')

src/libprs500/ebooks/lrf/html/convert_from.py

@@ -1717,7 +1717,9 @@ def try_opf(path, options, logger):
             category = opf.category
             if category:
                 options.category = category
-        if not options.cover:
+        if not options.cover or options.use_metadata_cover:
+            orig_cover = options.cover
+            options.cover = None
             cover = opf.cover            
             if cover:
                 if not os.path.isabs(cover):
@@ -1727,8 +1729,6 @@ def try_opf(path, options, logger):
                         PILImage.open(cover)
                         options.cover = cover
                     except:
-                        pass
-        if not options.cover:
                         for prefix in opf.possible_cover_prefixes():
                             if options.cover:
                                 break
@@ -1740,6 +1740,8 @@ def try_opf(path, options, logger):
                                     break
                                 except:
                                     continue
+            if not options.cover and orig_cover is not None:
+                options.cover = orig_cover        
         options.spine = [i.href for i in opf.spine.items()]
         options.toc   = opf.toc
     except Exception:

src/libprs500/gui2/dialogs/lrf_single.py

@@ -89,8 +89,6 @@ class LRFSingleDialog(QDialog, Ui_LRFSingleDialog):
             self.setWindowTitle('Convert %s to LRF'%(self.selected_format,))
             
         
-
-        
     def read_saved_options(self):
         cmdline = self.db.conversion_options(self.id, self.output_format.lower())
         if cmdline:
@@ -207,6 +205,7 @@ class LRFSingleDialog(QDialog, Ui_LRFSingleDialog):
                 state = Qt.Checked if default else Qt.Unchecked
                 obj.setCheckState(state)
         self.gui_headerformat.setDisabled(True)
+        self.gui_use_metadata_cover.setCheckState(Qt.Checked)
         self.preprocess.addItem('No preprocessing')
         for opt in self.PREPROCESS_OPTIONS:
             self.preprocess.addItem(opt.get_opt_string()[2:])

src/libprs500/gui2/dialogs/lrf_single.ui

@@ -256,6 +256,13 @@
                    </item>
                   </layout>
                  </item>
+                 <item row="2" column="0" >
+                  <widget class="QCheckBox" name="gui_use_metadata_cover" >
+                   <property name="text" >
+                    <string>Use &amp;metadata cover</string>
+                   </property>
+                  </widget>
+                 </item>
                 </layout>
                </widget>
               </item>