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Ross Thomas

ui: show toggleable "Follow" status in repo groups' repo list

It makes sense to show Follow status next to repo names in the repo list, and
it is a meaningful and efficient bulk operation to toggle Follow status there.

Clicking on the (Un)Follow 'heart' will toggle the caller's follow status for
that repo.

The repo model already has layering violations - expand on them to compute the
follow status of the current user.

(Changeset was cherry picked and modified by Mads Kiilerich.)

.. _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.