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Thomas De Schampheleire

diff: fix two-way diff for added or removed files

Viewing the two-way diff of an added file gives following exception:

File "_base_root_html", line 211, in render_body

File "_base_base_html", line 42, in render_body

File "files_diff_2way_html", line 197, in render_main

File ".../kallithea/lib/vcs/nodes.py", line 411, in is_binary
return b'\0' in self.content
TypeError: 'in <string>' requires string as left operand, not bytes

At this point, self.content was '' (empty string).

Commit 9203621cae03a03bbf8cfb4b667daa656780a93e made that node content is
always bytes, but this also had to be reflected in EmptyChangeset.

Add a basic test that catches this behavior.

.. _statistics:

=====================
Repository statistics
=====================

Kallithea has a *repository statistics* feature, disabled by default. When
enabled, the amount of commits per committer is visualized in a timeline. This
feature can be enabled using the ``Enable statistics`` checkbox on the
repository ``Settings`` page.

The statistics system makes heavy demands on the server resources, so
in order to keep a balance between usability and performance, statistics are
cached inside the database and gathered incrementally.

When Celery is disabled:

  On each first visit to the summary page a set of 250 commits are parsed and
  added to the statistics cache. This incremental gathering also happens on each
  visit to the statistics page, until all commits are fetched.

  Statistics are kept cached until additional commits are added to the
  repository. In such a case Kallithea will only fetch the new commits when
  updating its statistics cache.

When Celery is enabled:

  On the first visit to the summary page, Kallithea will create tasks that will
  execute on Celery workers. These tasks will gather all of the statistics until
  all commits are parsed. Each task parses 250 commits, then launches a new
  task.