Metadata download: Add an option to turn off the use of the published date for the earliest edition a book as the published date

src/calibre/ebooks/metadata/sources/base.py

@@ -26,6 +26,7 @@ msprefs.defaults['wait_after_first_identify_result'] = 30 # seconds
 msprefs.defaults['wait_after_first_cover_result'] = 60 # seconds
 msprefs.defaults['swap_author_names'] = False
 msprefs.defaults['fewer_tags'] = True
+msprefs.defaults['find_first_edition_date'] = True
 
 # Google covers are often poor quality (scans/errors) but they have high
 # resolution, so they trump covers from better sources. So make sure they

src/calibre/ebooks/metadata/sources/identify.py

@@ -120,6 +120,8 @@ class ISBNMerge(object):
                             self.log.debug(xw.tb)
                         else:
                             isbns, min_year = xw.isbns, xw.min_year
+                            if not msprefs['find_first_edition_date']:
+                                min_year = None
                 if not isbns:
                     isbns = frozenset([isbn])
                 if isbns in self.pools:

src/calibre/gui2/preferences/metadata_sources.py

@@ -296,6 +296,7 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         r('wait_after_first_cover_result', msprefs)
         r('swap_author_names', msprefs)
         r('fewer_tags', msprefs)
+        r('find_first_edition_date', msprefs)
 
         self.configure_plugin_button.clicked.connect(self.configure_plugin)
         self.sources_model = SourcesModel(self)

src/calibre/gui2/preferences/metadata_sources.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>781</width>
-    <height>394</height>
+    <height>439</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -21,7 +21,7 @@
     <widget class="QStackedWidget" name="stack">
      <widget class="QWidget" name="page">
       <layout class="QGridLayout" name="gridLayout">
-       <item row="0" column="0" rowspan="7">
+       <item row="0" column="0" rowspan="8">
         <widget class="QGroupBox" name="groupBox">
          <property name="title">
           <string>Metadata sources</string>
@@ -104,22 +104,22 @@
           </item>
           <item row="2" column="0">
            <widget class="QPushButton" name="select_default_button">
-            <property name="text">
-             <string>&amp;Select default</string>
-            </property>
             <property name="toolTip">
              <string>Restore your own subset of checked fields that you define using the 'Set as default' button</string>
             </property>
+            <property name="text">
+             <string>&amp;Select default</string>
+            </property>
            </widget>
           </item>
           <item row="2" column="1">
            <widget class="QPushButton" name="set_as_default_button">
-            <property name="text">
-             <string>&amp;Set as default</string>
-            </property>
             <property name="toolTip">
              <string>Store the currently checked fields as a default you can restore using the 'Select default' button</string>
             </property>
+            <property name="text">
+             <string>&amp;Set as default</string>
+            </property>
            </widget>
           </item>
          </layout>
@@ -139,7 +139,7 @@
          </property>
         </widget>
        </item>
-       <item row="4" column="1">
+       <item row="5" column="1">
         <widget class="QLabel" name="label_2">
          <property name="text">
           <string>Max. number of &amp;tags to download:</string>
@@ -149,10 +149,10 @@
          </property>
         </widget>
        </item>
-       <item row="4" column="2">
+       <item row="5" column="2">
         <widget class="QSpinBox" name="opt_max_tags"/>
        </item>
-       <item row="5" column="1">
+       <item row="6" column="1">
         <widget class="QLabel" name="label_3">
          <property name="text">
           <string>Max. &amp;time to wait after first match is found:</string>
@@ -162,14 +162,14 @@
          </property>
         </widget>
        </item>
-       <item row="5" column="2">
+       <item row="6" column="2">
         <widget class="QSpinBox" name="opt_wait_after_first_identify_result">
          <property name="suffix">
           <string> secs</string>
          </property>
         </widget>
        </item>
-       <item row="6" column="1">
+       <item row="7" column="1">
         <widget class="QLabel" name="label_4">
          <property name="text">
           <string>Max. time to wait after first &amp;cover is found:</string>
@@ -179,14 +179,14 @@
          </property>
         </widget>
        </item>
-       <item row="6" column="2">
+       <item row="7" column="2">
         <widget class="QSpinBox" name="opt_wait_after_first_cover_result">
          <property name="suffix">
           <string> secs</string>
          </property>
         </widget>
        </item>
-       <item row="3" column="1" colspan="2">
+       <item row="4" column="1" colspan="2">
         <widget class="QCheckBox" name="opt_fewer_tags">
          <property name="toolTip">
           <string>&lt;p&gt;Different metadata sources have different sets of tags for the same book. If this option is checked, then calibre will use the smaller tag sets. These tend to be more like genres, while the larger tag sets tend to describe the books content.
@@ -197,6 +197,13 @@
          </property>
         </widget>
        </item>
+       <item row="3" column="1" colspan="2">
+        <widget class="QCheckBox" name="opt_find_first_edition_date">
+         <property name="text">
+          <string>Use published date of earliest &quot;edition&quot; (from worldcat.org)</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
      <widget class="QWidget" name="page_2"/>