Support short and narrow formats for format_timedelta(..., add_direct…

…ion=True) (#1163)

Fixes #1162

babel/dates.py

@@ -940,16 +940,20 @@ def format_timedelta(
     else:
         seconds = delta
     locale = Locale.parse(locale)
+    date_fields = locale._data["date_fields"]
+    unit_patterns = locale._data["unit_patterns"]
 
     def _iter_patterns(a_unit):
         if add_direction:
-            unit_rel_patterns = locale._data['date_fields'][a_unit]
+            # Try to find the length variant version first ("year-narrow")
+            # before falling back to the default.
+            unit_rel_patterns = (date_fields.get(f"{a_unit}-{format}") or date_fields[a_unit])
             if seconds >= 0:
                 yield unit_rel_patterns['future']
             else:
                 yield unit_rel_patterns['past']
         a_unit = f"duration-{a_unit}"
-        unit_pats = locale._data['unit_patterns'].get(a_unit, {})
+        unit_pats = unit_patterns.get(a_unit, {})
         yield unit_pats.get(format)
         # We do not support `<alias>` tags at all while ingesting CLDR data,
         # so these aliases specified in `root.xml` are hard-coded here:

tests/test_dates.py

@@ -807,3 +807,24 @@ def test_issue_892():
 def test_issue_1089():
     assert dates.format_datetime(datetime.now(), locale="ja_JP@mod")
     assert dates.format_datetime(datetime.now(), locale=Locale.parse("ja_JP@mod"))
+
+
+@pytest.mark.parametrize(('locale', 'format', 'negative', 'expected'), [
+    ('en_US', 'long', False, 'in 3 hours'),
+    ('en_US', 'long', True, '3 hours ago'),
+    ('en_US', 'narrow', False, 'in 3h'),
+    ('en_US', 'narrow', True, '3h ago'),
+    ('en_US', 'short', False, 'in 3 hr.'),
+    ('en_US', 'short', True, '3 hr. ago'),
+    ('fi_FI', 'long', False, '3 tunnin päästä'),
+    ('fi_FI', 'long', True, '3 tuntia sitten'),
+    ('fi_FI', 'short', False, '3 t päästä'),
+    ('fi_FI', 'short', True, '3 t sitten'),
+    ('sv_SE', 'long', False, 'om 3 timmar'),
+    ('sv_SE', 'long', True, 'för 3 timmar sedan'),
+    ('sv_SE', 'short', False, 'om 3 tim'),
+    ('sv_SE', 'short', True, 'för 3 tim sedan'),
+])
+def test_issue_1162(locale, format, negative, expected):
+    delta = timedelta(seconds=10800) * (-1 if negative else +1)
+    assert dates.format_timedelta(delta, add_direction=True, format=format, locale=locale) == expected