1 files changed, 110 insertions, 0 deletions
diff --git a/pygithub3/core/result/smart.py b/pygithub3/core/result/smart.py
new file mode 100644
index 0000000..0343a9b
--- /dev/null
+++ b/pygithub3/core/result/smart.py
@@ -0,0 +1,110 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+
+from . import base
+from .link import Link
+
+
+class Method(base.Method):
+    """ Lazy and cache support """
+
+    def cached(func):
+        """ Decorator to don't do a request if it's cached """
+        def wrapper(self, page=1):
+            if str(page) in self.cache:
+                return self.cache[str(page)]
+            return func(self, page)
+        return wrapper
+
+    def if_needs_lastpage(func):
+        """ Decorator to set last page only if it can and it hasn't retrieved
+        before """
+        def wrapper(self, has_link):
+            has_last_page = hasattr(self, 'last_page')
+            if not has_last_page and has_link:
+                return func(self, has_link)
+            elif not has_last_page and not has_link:
+                self.last_page = 1
+        return wrapper
+
+    @if_needs_lastpage
+    def __set_last_page_from(self, link_header):
+        """ Get and set last_page form link header """
+        link = Link(link_header)
+        self.last_page = int(link.last.params.get('page'))
+
+    @cached
+    def __call__(self, page=1):
+        """ Call a real request """
+        response = self.method(page=page)
+        self.__set_last_page_from(response.headers.get('link'))
+        self.cache[str(page)] = self.resource.loads(response.content)
+        return self.cache[str(page)]
+
+    @property
+    def last(self):
+        if not hasattr(self, 'last_page'):
+            self()
+        return self.last_page
+
+
+class Result(base.Result):
+    """
+    It's a very **lazy** paginator beacuse only do a real request
+    when is needed, besides it's **cached**, so never repeats a request.
+
+    You have several ways to consume it
+
+    #. Iterating over the result::
+
+        result = some_request()
+        for page in result:
+            for resource in page:
+                print resource
+
+    #. With a generator::
+
+        result = some_request()
+        for resource in result.iterator():
+            print resource
+
+    #. As a list::
+
+        result = some_request()
+        print result.all()
+
+    #. Also you can request some page manually
+
+        Each ``Page`` is an iterator and contains resources::
+
+            result = some_request()
+            assert result.pages > 3
+            page3 = result.get_page(3)
+            page3_resources = list(page3)
+    """
+
+    def __init__(self, method):
+        super(Result, self).__init__(method)
+        self.page = base.Page(self.getter)
+
+    def __next__(self):
+        if self.page <= self.pages:
+            page_to_return = self.page
+            self.page = base.Page(self.getter, page_to_return + 1)
+            return page_to_return
+        self.page = base.Page(self.getter)
+        raise StopIteration
+
+    @property
+    def pages(self):
+        """ Total number of pages in request """
+        return self.getter.last
+
+    def get_page(self, page):
+        """ Get ``Page`` of resources
+
+        :param int page: Page number
+        """
+        if page in xrange(1, self.pages + 1):
+            return base.Page(self.getter, page)
+        return None