Fixed #21408 — German Translation for “3 days ago”

The problem:
“3 days ago” should translate to “vor 3 Tagen” in German, while “3 days” translates to “3 Tage”. #21408 describes that django always translated to “Tage”, even when the dative “Tagen” was correct. The same applies to months (“Monate”/“Monaten”) and years (“Jahre”/“Jahren”).

The solution:
Let `timesince` caller provide the string dict to use for the time-related strings.

AUTHORS

@@ -559,6 +559,7 @@ answer newbie questions, and generally made Django that much better:
     Max Derkachev <mderk@yandex.ru>
     Maxime Lorant <maxime.lorant@gmail.com>
     Maxime Turcotte <maxocub@riseup.net>
+    Maximilian Merz <django@mxmerz.de>
     Maximillian Dornseif <md@hudora.de>
     mccutchen@gmail.com
     Meir Kriheli <http://mksoft.co.il/>

django/contrib/humanize/locale/de/LC_MESSAGES/django.po

@@ -4,12 +4,13 @@
 # André Hagenbruch, 2011
 # Claude Paroz <claude@2xlibre.net>, 2013
 # Jannis Leidel <jannis@leidel.info>, 2011,2013-2014
+# Maximilian Merz <django@mxmerz.de>, 2018
 msgid ""
 msgstr ""
 "Project-Id-Version: django\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2015-01-17 11:07+0100\n"
-"PO-Revision-Date: 2017-09-23 18:54+0000\n"
+"PO-Revision-Date: 2018-03-13 16:07+0100\n"
 "Last-Translator: Jannis Leidel <jannis@leidel.info>\n"
 "Language-Team: German (http://www.transifex.com/django/django/language/de/)\n"
 "MIME-Version: 1.0\n"
@@ -202,7 +203,6 @@ msgid "yesterday"
 msgstr "gestern"
 
 #, python-format
-msgctxt "naturaltime"
 msgid "%(delta)s ago"
 msgstr "vor %(delta)s"
 
@@ -234,10 +234,56 @@ msgstr[0] "vor einer Stunde"
 msgstr[1] "vor %(count)s Stunden"
 
 #, python-format
-msgctxt "naturaltime"
 msgid "%(delta)s from now"
 msgstr "in %(delta)s"
 
+#, python-format
+msgctxt "naturaltime-future"
+msgid "%(delta)s from now"
+msgstr "in %(delta)s"
+
+#, python-format
+msgctxt "naturaltime-past"
+msgid "%d day"
+msgid_plural "%d days"
+msgstr[0] "%d Tag"
+msgstr[1] "%d Tagen"
+
+#, python-format
+msgctxt "naturaltime-past"
+msgid "%d month"
+msgid_plural "%d months"
+msgstr[0] "%d Monat"
+msgstr[1] "%d Monaten"
+
+#, python-format
+msgctxt "naturaltime-past"
+msgid "%d year"
+msgid_plural "%d years"
+msgstr[0] "%d Jahr"
+msgstr[1] "%d Jahren"
+
+#, python-format
+msgctxt "naturaltime-future"
+msgid "%d day"
+msgid_plural "%d days"
+msgstr[0] "%d Tag"
+msgstr[1] "%d Tagen"
+
+#, python-format
+msgctxt "naturaltime-future"
+msgid "%d month"
+msgid_plural "%d months"
+msgstr[0] "%d Monat"
+msgstr[1] "%d Monaten"
+
+#, python-format
+msgctxt "naturaltime-future"
+msgid "%d year"
+msgid_plural "%d years"
+msgstr[0] "%d Jahr"
+msgstr[1] "%d Jahren"
+
 #. Translators: please keep a non-breaking space (U+00A0)
 #. between count and time unit.
 #, python-format

django/contrib/humanize/templatetags/humanize.py

@@ -8,7 +8,9 @@ from django.template import defaultfilters
 from django.utils.formats import number_format
 from django.utils.safestring import mark_safe
 from django.utils.timezone import is_aware, utc
-from django.utils.translation import gettext as _, ngettext, pgettext
+from django.utils.translation import (
+    gettext as _, ngettext, npgettext_lazy, pgettext,
+)
 
 register = template.Library()
 
@@ -220,7 +222,16 @@ def naturaltime(value):
         delta = now - value
         if delta.days != 0:
             # Translators: delta will contain a string like '2 months' or '1 month, 2 weeks'
-            return _('%(delta)s ago') % {'delta': defaultfilters.timesince(value, now)}
+            return _('%(delta)s ago') % {'delta': defaultfilters.timesince(value, now, time_strings={
+                # Translators: 'naturaltime-past' strings will be included in
+                # '%(delta)s ago'
+                'year': npgettext_lazy('naturaltime-past', '%d year', '%d years'),
+                'month': npgettext_lazy('naturaltime-past', '%d month', '%d months'),
+                'week': npgettext_lazy('naturaltime-past', '%d week', '%d weeks'),
+                'day': npgettext_lazy('naturaltime-past', '%d day', '%d days'),
+                'hour': npgettext_lazy('naturaltime-past', '%d hour', '%d hours'),
+                'minute': npgettext_lazy('naturaltime-past', '%d minute', '%d minutes')
+            })}
         elif delta.seconds == 0:
             return _('now')
         elif delta.seconds < 60:
@@ -247,7 +258,16 @@ def naturaltime(value):
         delta = value - now
         if delta.days != 0:
             # Translators: delta will contain a string like '2 months' or '1 month, 2 weeks'
-            return _('%(delta)s from now') % {'delta': defaultfilters.timeuntil(value, now)}
+            return _('%(delta)s from now') % {'delta': defaultfilters.timeuntil(value, now, time_strings={
+                # Translators: 'naturaltime-future' strings will be included in
+                # '%(delta)s from now'
+                'year': npgettext_lazy('naturaltime-future', '%d year', '%d years'),
+                'month': npgettext_lazy('naturaltime-future', '%d month', '%d months'),
+                'week': npgettext_lazy('naturaltime-future', '%d week', '%d weeks'),
+                'day': npgettext_lazy('naturaltime-future', '%d day', '%d days'),
+                'hour': npgettext_lazy('naturaltime-future', '%d hour', '%d hours'),
+                'minute': npgettext_lazy('naturaltime-future', '%d minute', '%d minutes')
+            })}
         elif delta.seconds == 0:
             return _('now')
         elif delta.seconds < 60:

django/utils/timesince.py

@@ -5,17 +5,26 @@ from django.utils.html import avoid_wrapping
 from django.utils.timezone import is_aware, utc
 from django.utils.translation import gettext, ngettext_lazy
 
+TIME_STRINGS = {
+    'year': ngettext_lazy('%d year', '%d years'),
+    'month': ngettext_lazy('%d month', '%d months'),
+    'week': ngettext_lazy('%d week', '%d weeks'),
+    'day': ngettext_lazy('%d day', '%d days'),
+    'hour': ngettext_lazy('%d hour', '%d hours'),
+    'minute': ngettext_lazy('%d minute', '%d minutes'),
+}
+
 TIMESINCE_CHUNKS = (
-    (60 * 60 * 24 * 365, ngettext_lazy('%d year', '%d years')),
-    (60 * 60 * 24 * 30, ngettext_lazy('%d month', '%d months')),
-    (60 * 60 * 24 * 7, ngettext_lazy('%d week', '%d weeks')),
-    (60 * 60 * 24, ngettext_lazy('%d day', '%d days')),
-    (60 * 60, ngettext_lazy('%d hour', '%d hours')),
-    (60, ngettext_lazy('%d minute', '%d minutes'))
+    (60 * 60 * 24 * 365, 'year'),
+    (60 * 60 * 24 * 30, 'month'),
+    (60 * 60 * 24 * 7, 'week'),
+    (60 * 60 * 24, 'day'),
+    (60 * 60, 'hour'),
+    (60, 'minute'),
 )
 
 
-def timesince(d, now=None, reversed=False):
+def timesince(d, now=None, reversed=False, time_strings=None):
     """
     Take two datetime objects and return the time between d and now as a nicely
     formatted string, e.g. "10 minutes". If d occurs after now, return
@@ -26,9 +35,15 @@ def timesince(d, now=None, reversed=False):
     displayed.  For example, "2 weeks, 3 days" and "1 year, 3 months" are
     possible outputs, but "2 weeks, 3 hours" and "1 year, 5 days" are not.
 
+    `time_strings` is an optional dict of strings to replace the default
+    TIME_STRINGS dict.
+
     Adapted from
     http://web.archive.org/web/20060617175230/http://blog.natbat.co.uk/archive/2003/Jun/14/time_since
     """
+    if time_strings is None:
+        time_strings = TIME_STRINGS
+
     # Convert datetime.date to datetime.datetime for comparison.
     if not isinstance(d, datetime.datetime):
         d = datetime.datetime(d.year, d.month, d.day)
@@ -59,18 +74,18 @@ def timesince(d, now=None, reversed=False):
         count = since // seconds
         if count != 0:
             break
-    result = avoid_wrapping(name % count)
+    result = avoid_wrapping(time_strings[name] % count)
     if i + 1 < len(TIMESINCE_CHUNKS):
         # Now get the second item
         seconds2, name2 = TIMESINCE_CHUNKS[i + 1]
         count2 = (since - (seconds * count)) // seconds2
         if count2 != 0:
-            result += gettext(', ') + avoid_wrapping(name2 % count2)
+            result += gettext(', ') + avoid_wrapping(time_strings[name2] % count2)
     return result
 
 
-def timeuntil(d, now=None):
+def timeuntil(d, now=None, time_strings=None):
     """
     Like timesince, but return a string measuring the time until the given time.
     """
-    return timesince(d, now, reversed=True)
+    return timesince(d, now, reversed=True, time_strings=time_strings)

tests/humanize_tests/tests.py

@@ -289,3 +289,29 @@ class HumanizeTests(SimpleTestCase):
                 self.assertEqual(expected_natural_time, natural_time)
         finally:
             humanize.datetime = orig_humanize_datetime
+
+    def test_dative_inflection_for_timedelta(self):
+        """Translation may differ depending on the string it is inserted in."""
+        test_list = [
+            now - datetime.timedelta(days=1),
+            now - datetime.timedelta(days=2),
+            now - datetime.timedelta(days=30),
+            now - datetime.timedelta(days=60),
+            now - datetime.timedelta(days=500),
+            now - datetime.timedelta(days=865),
+        ]
+        result_list = [
+            'vor 1\xa0Tag',
+            'vor 2\xa0Tagen',
+            'vor 1\xa0Monat',
+            'vor 2\xa0Monaten',
+            'vor 1\xa0Jahr, 4\xa0Monaten',
+            'vor 2\xa0Jahren, 4\xa0Monaten',
+        ]
+
+        orig_humanize_datetime, humanize.datetime = humanize.datetime, MockDateTime
+        try:
+            with translation.override('de'), self.settings(USE_L10N=True):
+                self.humanize_tester(test_list, result_list, 'naturaltime')
+        finally:
+            humanize.datetime = orig_humanize_datetime