Keyboard shortcut for printing in viewer

src/calibre/gui2/viewer/keys.py

@@ -92,4 +92,7 @@ SHORTCUTS = {
 
         'Reload': (['Ctrl+R', 'F5'],
                      _('Reload the current book')),
+
+        'Print': (['Ctrl+P'],
+                     _('Print the current book')),
 }

src/calibre/gui2/viewer/main.py

@@ -962,6 +962,7 @@ class EbookViewer(MainWindow):
             'Bookmark': bac,
             'Reload': self.action_reload,
             'Table of Contents': self.action_table_of_contents,
+            'Print': self.action_print,
         }.get(key, None)
         if action is not None:
             event.accept()