newdb: Fix tweak to sort dates by visible fields not being respected

src/calibre/db/fields.py

@@ -10,13 +10,14 @@ __docformat__ = 'restructuredtext en'
 
 from threading import Lock
 from collections import defaultdict, Counter
+from functools import partial
 
 from calibre.db.tables import ONE_ONE, MANY_ONE, MANY_MANY, null
 from calibre.db.write import Writer
 from calibre.ebooks.metadata import title_sort, author_to_author_sort
 from calibre.utils.config_base import tweaks
 from calibre.utils.icu import sort_key
-from calibre.utils.date import UNDEFINED_DATE
+from calibre.utils.date import UNDEFINED_DATE, clean_date_for_sort
 from calibre.utils.localization import calibre_langcode_to_name
 
 class Field(object):
@@ -44,6 +45,14 @@ class Field(object):
             self._default_sort_key = None
         elif dt == 'datetime':
             self._default_sort_key = UNDEFINED_DATE
+            if tweaks['sort_dates_using_visible_fields']:
+                fmt = None
+                if name in {'timestamp', 'pubdate', 'last_modified'}:
+                    fmt = tweaks['gui_%s_display_format' % name]
+                elif self.metadata['is_custom']:
+                    fmt = self.metadata.get('display', {}).get('date_format', None)
+                self._sort_key = partial(clean_date_for_sort, fmt=fmt)
+
         if self.name == 'languages':
             self._sort_key = lambda x:sort_key(calibre_langcode_to_name(x))
         self.is_multiple = (bool(self.metadata['is_multiple']) or self.name ==

src/calibre/db/tests/reading.py

@@ -180,6 +180,15 @@ class ReadingTest(BaseTest):
             self.assertEqual([1, 3, 2], cache.multisort([(field, True)], ids_to_sort=(1, 2, 3)))
             self.assertEqual([2, 3, 1], cache.multisort([(field, False)], ids_to_sort=(1, 2, 3)))
 
+        # Test tweak to sort dates by visible format
+        from calibre.utils.date import parse_only_date as p
+        from calibre.utils.config_base import Tweak
+        self.assertEqual(cache.set_field('pubdate', {1:p('2001-3-3'), 2:p('2002-2-3'), 3:p('2003-1-3')}), {1, 2, 3})
+        self.assertEqual([1, 2, 3], cache.multisort([('pubdate', True)]))
+        with Tweak('gui_pubdate_display_format', 'MMM'), Tweak('sort_dates_using_visible_fields', True):
+            c2 = self.init_cache()
+            self.assertEqual([3, 2, 1], c2.multisort([('pubdate', True)]))
+
     # }}}
 
     def test_get_metadata(self):  # {{{

src/calibre/utils/config_base.py

@@ -478,3 +478,14 @@ def reset_tweaks_to_default():
     exec default_tweaks in dg, dl
     tweaks = dl
 
+class Tweak(object):
+
+    def __init__(self, name, value):
+        self.name, self.value = name, value
+
+    def __enter__(self):
+        self.origval = tweaks[self.name]
+        tweaks[self.name] = self.value
+
+    def __exit__(self, *args):
+        tweaks[self.name] = self.origval

src/calibre/utils/date.py

@@ -357,10 +357,10 @@ def cd_repl_func(tt, dt, match_object):
         return ''
     return cd_function_index[s[0]](tt, dt)
 
-def clean_date_for_sort(dt, format):
+def clean_date_for_sort(dt, fmt=None):
     ''' Return dt with fields not in shown in format set to a default '''
-    if not format:
-        format = 'yyMd'
+    if not fmt:
+        fmt = 'yyMd'
 
     if not isinstance(dt, datetime):
         dt = datetime.combine(dt, dtime())
@@ -370,15 +370,15 @@ def clean_date_for_sort(dt, format):
             dt = dt.replace(tzinfo=_local_tz)
         dt = as_local_time(dt)
 
-    if format == 'iso':
-        format = 'yyMdhms'
+    if fmt == 'iso':
+        fmt = 'yyMdhms'
 
     tt = {'year':UNDEFINED_DATE.year, 'mon':UNDEFINED_DATE.month,
           'day':UNDEFINED_DATE.day, 'hour':UNDEFINED_DATE.hour,
           'min':UNDEFINED_DATE.minute, 'sec':UNDEFINED_DATE.second}
 
     repl_func = partial(cd_repl_func, tt, dt)
-    re.sub('(s{1,2})|(m{1,2})|(h{1,2})|(d{1,4}|M{1,4}|(?:yyyy|yy))', repl_func, format)
+    re.sub('(s{1,2})|(m{1,2})|(h{1,2})|(d{1,4}|M{1,4}|(?:yyyy|yy))', repl_func, fmt)
     return dt.replace(year=tt['year'], month=tt['mon'], day=tt['day'], hour=tt['hour'],
                       minute=tt['min'], second=tt['sec'], microsecond=0)