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Thomas De Schampheleire
comments: avoid storing 'No comments' text when changing status

When a general comment (with or without status change) is added to a
changeset or pull request, and no text was added, Kallithea automatically
used 'No comments' as text. The stub text is added to the database as if it has
been entered by the user and it can thus not easily be identified as an
automatic comment.

This commit makes following changes:
- allow adding an empty comment to the database when there is a status
change. An empty comment without status change is ignored.
- do not add a stub text to the database, but generate it on demand
- the stub text is shown in italic font to differentiate it from user-entered
text

Currently there is a large amount of duplication between
controllers/changeset.py and controllers/pullrequests.py, which is to be
cleaned up in a later commit.
.. _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.