Ensuring that generic_index_render always works fine with an empty post list.

felixfontein · felixfontein · commit 6fad65a7c148 · 2016-12-08T07:36:47.000+01:00
diff --git a/CHANGES.txt b/CHANGES.txt
@@ -8,6 +8,9 @@ Bugfixes
   as ``global_data`` (Issue #2488)
 * Don't crash if plugins is a file (Issue #2539)
 * Don't mangle bare ``#`` links (Issue #2553)
+* ``generic_index_renderer`` now always produces output. It previously
+  did not when the post list was empty and ``INDEXES_STATIC == False``.
+  (via Issue #2579)
 
 Features
 --------
diff --git a/nikola/nikola.py b/nikola/nikola.py
@@ -2404,8 +2404,11 @@ def generic_index_renderer(self, lang, posts, indexes_title, template_name, cont
             while posts:
                 lists.append(posts[:kw["index_display_post_count"]])
                 posts = posts[kw["index_display_post_count"]:]
+            if not lists:
+                lists.append([])
         num_pages = len(lists)
-        displayed_page_numbers = [utils.get_displayed_page_number(i, num_pages, self) for i in range(num_pages or 1)]
+        assert num_pages >= 1
+        displayed_page_numbers = [utils.get_displayed_page_number(i, num_pages, self) for i in range(num_pages)]
         page_links = [page_link(i, page_number, num_pages, False) for i, page_number in enumerate(displayed_page_numbers)]
         if kw['show_index_page_navigation']:
             # Since the list displayed_page_numbers is not necessarily
@@ -2414,7 +2417,6 @@ def generic_index_renderer(self, lang, posts, indexes_title, template_name, cont
             # via a map. This allows to not replicate the logic of
             # utils.get_displayed_page_number() here.
             temp_map = {page_number - 1: link for page_number, link in zip(displayed_page_numbers, page_links)}
-            # Note that len(temp_map) >= num_pages.
             page_links_context = [temp_map[i] for i in range(num_pages)]
         for i, post_list in enumerate(lists):
             context = context_source.copy()
