Makes __format__() use the configured formatter.

Fixes #90

Author: sdispater

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Changed
 
 - Improved `diff_for_humans()` method to display more intuitive strings on edge cases.
+- Formatting (with f-strings or `format()`) will now use the configured formatter.
 
 
 ## [1.0.1]

pendulum/mixins/default.py

@@ -158,7 +158,7 @@ def for_json(self):
 
     def __format__(self, format_spec):
         if len(format_spec) > 0:
-            return self.strftime(format_spec)
+            return self.format(format_spec)
 
         return str(self)
 

tests/date_tests/test_strings.py

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+import pendulum
 from pendulum import Date
 from .. import AbstractTestCase
 
@@ -78,3 +79,11 @@ def test_format(self):
         d = Date(1975, 12, 25)
         self.assertEqual('1975-12-25', '{}'.format(d))
         self.assertEqual('1975', '{:%Y}'.format(d))
+
+    def test_format_alternative_formatter(self):
+        pendulum.set_formatter('alternative')
+
+        d = Date(1975, 12, 25)
+        self.assertEqual('1975-12-25', '{}'.format(d))
+        self.assertEqual('1975', '{:YYYY}'.format(d))
+        self.assertEqual('%1975', '{:%Y}'.format(d))

tests/pendulum_tests/test_strings.py

@@ -148,3 +148,11 @@ def test_format(self):
         d = Pendulum(1975, 12, 25, 14, 15, 16, tzinfo='Europe/Paris')
         self.assertEqual('1975-12-25T14:15:16+01:00', '{}'.format(d))
         self.assertEqual('1975', '{:%Y}'.format(d))
+
+    def test_format_alternative_formatter(self):
+        pendulum.set_formatter('alternative')
+        d = Pendulum(1975, 12, 25, 14, 15, 16, tzinfo='Europe/Paris')
+
+        self.assertEqual('1975-12-25T14:15:16+01:00', '{}'.format(d))
+        self.assertEqual('1975', '{:YYYY}'.format(d))
+        self.assertEqual('%1975', '{:%Y}'.format(d))