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Thomas De Schampheleire

admin: hooks: only flash 'Updated hooks' if there are changes

Clicking 'Save' on the hook administration page currently always renders the
flash message 'Updated hooks' even if nothing was changed.
This may be particularly confusing when the action you intended to do got an
error, e.g. adding a hook that already exists, adding a builtin hook, ...

Instead, compare the old and new value when editing a hook, and only save
and create the flash if they are different.

For this to be work correctly in test, the old value needs to be passed as
well like in the real situation, otherwise the 'zip' operation will return
an empty list.

.. _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.