From 4e8ac7d35af1ade2781406c678dbf8f5908737c6 Mon Sep 17 00:00:00 2001
From: Albert Tugushev <albert@tugushev.ru>
Date: Sat, 2 Jan 2016 08:10:58 +0300
Subject: [PATCH] Fix window exceeding page range

Resolve issue #33
---
 .../templatetags/pagination_tags.py           |  2 +-
 linaro_django_pagination/tests/test_main.py   | 32 +++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/linaro_django_pagination/templatetags/pagination_tags.py b/linaro_django_pagination/templatetags/pagination_tags.py
index 167f13a..f106942 100644
--- a/linaro_django_pagination/templatetags/pagination_tags.py
+++ b/linaro_django_pagination/templatetags/pagination_tags.py
@@ -284,7 +284,7 @@ def paginate(context, window=DEFAULT_WINDOW, margin=DEFAULT_MARGIN):
             window_end = window_end - window_start
             window_start = 0
         if window_end > paginator.num_pages:
-            window_start = window_start - (window_end - paginator.num_pages)
+            window_start = max(0, window_start - (window_end - paginator.num_pages))
             window_end = paginator.num_pages
         pages = page_range[window_start:window_end]
 
diff --git a/linaro_django_pagination/tests/test_main.py b/linaro_django_pagination/tests/test_main.py
index 1dc6d2c..2409b0f 100644
--- a/linaro_django_pagination/tests/test_main.py
+++ b/linaro_django_pagination/tests/test_main.py
@@ -209,6 +209,38 @@ class ZeroWindowZeroMarginTestCase(SimpleTestCase):
         )
 
 
+class NoEllipsisTestCase(SimpleTestCase):
+    """
+    Tests a case where should be no any ellipsis pages.
+    """
+    def setUp(self):
+        self.p = Paginator(range(100), 25)
+
+    def test_on_start(self):
+        self.assertListEqual(
+            paginate({'paginator': self.p, 'page_obj': self.p.page(1)}, 2, 0)['pages'],
+            [1, 2, 3, 4],
+        )
+
+    def test_in_middle_page_2(self):
+        self.assertListEqual(
+            paginate({'paginator': self.p, 'page_obj': self.p.page(2)}, 2, 0)['pages'],
+            [1, 2, 3, 4],
+        )
+
+    def test_in_middle_page_3(self):
+        self.assertListEqual(
+            paginate({'paginator': self.p, 'page_obj': self.p.page(3)}, 2, 0)['pages'],
+            [1, 2, 3, 4],
+        )
+
+    def test_on_end(self):
+        self.assertListEqual(
+            paginate({'paginator': self.p, 'page_obj': self.p.page(4)}, 2, 0)['pages'],
+            [1, 2, 3, 4],
+        )
+
+
 class SpecialTestCase(SimpleTestCase):
     def test_middle_with_no_window_and_margin_1(self):
         p = Paginator(range(31), 2)
-- 
2.20.1