Merge branch 'Develop'

# Conflicts:
#	MANIFEST.in
#	README.md
#	cps/helper.py
#	cps/static/js/archive/archive.js
#	cps/translations/nl/LC_MESSAGES/messages.mo
#	cps/translations/nl/LC_MESSAGES/messages.po
#	cps/ub.py
#	cps/updater.py
#	cps/web.py
#	cps/worker.py
#	optional-requirements.txt

cps/pagination.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+#  This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
+#    Copyright (C) 2018-2019 OzzieIsaacs, cervinko, jkrehm, bodybybuddha, ok11,
+#                            andy29485, idalin, Kyosfonica, wuqi, Kennyl, lemmsh,
+#                            falgh1, grunjol, csitko, ytils, xybydy, trasba, vrabe,
+#                            ruben-herold, marblepebble, JackED42, SiphonSquirrel,
+#                            apetresc, nanu-c, mutschler
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import division, print_function, unicode_literals
+from math import ceil
+
+
+# simple pagination for the feed
+class Pagination(object):
+    def __init__(self, page, per_page, total_count):
+        self.page = int(page)
+        self.per_page = int(per_page)
+        self.total_count = int(total_count)
+
+    @property
+    def next_offset(self):
+        return int(self.page * self.per_page)
+
+    @property
+    def previous_offset(self):
+        return int((self.page - 2) * self.per_page)
+
+    @property
+    def last_offset(self):
+        last = int(self.total_count) - int(self.per_page)
+        if last < 0:
+            last = 0
+        return int(last)
+
+    @property
+    def pages(self):
+        return int(ceil(self.total_count / float(self.per_page)))
+
+    @property
+    def has_prev(self):
+        return self.page > 1
+
+    @property
+    def has_next(self):
+        return self.page < self.pages
+
+    # right_edge: last right_edges count of all pages are shown as number, means, if 10 pages are paginated -> 9,10 shwn
+    # left_edge: first left_edges count of all pages are shown as number                                    -> 1,2 shwn
+    # left_current: left_current count below current page are shown as number, means if current page 5      -> 3,4 shwn
+    # left_current: right_current count above current page are shown as number, means if current page 5     -> 6,7 shwn
+    def iter_pages(self, left_edge=2, left_current=2,
+                   right_current=4, right_edge=2):
+        last = 0
+        left_current = self.page - left_current - 1
+        right_current = self.page + right_current + 1
+        right_edge = self.pages - right_edge
+        for num in range(1, (self.pages + 1)):
+            if num <= left_edge or (left_current < num < right_current) or num > right_edge:
+                if last + 1 != num:
+                    yield None
+                yield num
+                last = num