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Thomas De Schampheleire
issues: support generic regex replacements in issue_url and issue_prefix

Issue reference linking is pretty limited:
- the issue_url is a literal with only three special tokens {id},
{repo} and {repo_name}. There is no way to let the URL be dependent on
other elements of the input issue reference.
- The value for {id} is somewhat oddly determined by the concatenation of
all parenthesized groups in the issue_pat regular expression
- the link text of the resulting link is limited to the contents of the
literal issue_prefix with the determined {id}. It is not possible to
retain the input issue reference verbatim, nor to let the link text be
dependent on other elements of the input issue reference.

This commit makes the issue reference linking more flexible:

- issue_prefix is replaced by the more generic issue_sub(stitution), which
is a string that may contain backreferences to regex groups specified in
issue_pat. This string, with backreferences resolved, is used as the
link text of urlified issue references.
- if issue_sub is empty, the entire text matched by issue_pat is used as
the link text.
- like issue_sub, also issue_url can contain backreferences to regex groups.
- {id} is no longer treated as a special token, as it can be solved by
generic backreferences ('\g<id>' assuming issue pattern contains something
like '(P<id>\d+)'. {repo} and {repo_name} are still supported, because
their value is provided externally and not normally part of the
issue pattern.

Documentation and ini file template is updated as well.
.. _installation:

==========================
Installation on Unix/Linux
==========================

The following describes three different ways of installing Kallithea:

- :ref:`installation-source`: The simplest way to keep the installation
  up-to-date and track any local customizations is to run directly from
  source in a Kallithea repository clone, preferably inside a virtualenv
  virtual Python environment.

- :ref:`installation-virtualenv`: If you prefer to only use released versions
  of Kallithea, the recommended method is to install Kallithea in a virtual
  Python environment using `virtualenv`. The advantages of this method over
  direct installation is that Kallithea and its dependencies are completely
  contained inside the virtualenv (which also means you can have multiple
  installations side by side or remove it entirely by just removing the
  virtualenv directory) and does not require root privileges.

- :ref:`installation-without-virtualenv`: The alternative method of installing
  a Kallithea release is using standard pip. The package will be installed in
  the same location as all other Python packages you have ever installed. As a
  result, removing it is not as straightforward as with a virtualenv, as you'd
  have to remove its dependencies manually and make sure that they are not
  needed by other packages.

Regardless of the installation method you may need to make sure you have
appropriate development packages installed, as installation of some of the
Kallithea dependencies requires a working C compiler and libffi library
headers. Depending on your configuration, you may also need to install
Git and development packages for the database of your choice.

For Debian and Ubuntu, the following command will ensure that a reasonable
set of dependencies is installed::

    sudo apt-get install build-essential git python-pip python-virtualenv libffi-dev python-dev

For Fedora and RHEL-derivatives, the following command will ensure that a
reasonable set of dependencies is installed::

    sudo yum install gcc git python-pip python-virtualenv libffi-devel python-devel

.. _installation-source:


Installation from repository source
-----------------------------------

To install Kallithea in a virtualenv_ using the stable branch of the development
repository, follow the instructions below::

        hg clone https://kallithea-scm.org/repos/kallithea -u stable
        cd kallithea
        virtualenv ../kallithea-venv
        . ../kallithea-venv/bin/activate
        pip install --upgrade pip setuptools
        pip install --upgrade -e .
        python2 setup.py compile_catalog   # for translation of the UI

You can now proceed to :ref:`setup`.

.. _installation-virtualenv:


Installing a released version in a virtualenv
---------------------------------------------

It is highly recommended to use a separate virtualenv_ for installing Kallithea.
This way, all libraries required by Kallithea will be installed separately from your
main Python installation and other applications and things will be less
problematic when upgrading the system or Kallithea.
An additional benefit of virtualenv_ is that it doesn't require root privileges.

- Assuming you have installed virtualenv_, create a new virtual environment
  for example, in `/srv/kallithea/venv`, using the virtualenv command::

    virtualenv /srv/kallithea/venv

- Activate the virtualenv_ in your current shell session and make sure the
  basic requirements are up-to-date by running::

    . /srv/kallithea/venv/bin/activate
    pip install --upgrade pip setuptools

.. note:: You can't use UNIX ``sudo`` to source the ``virtualenv`` script; it
   will "activate" a shell that terminates immediately. It is also perfectly
   acceptable (and desirable) to create a virtualenv as a normal user.

.. note:: Some dependencies are optional. If you need them, install them in
   the virtualenv too::

     pip install --upgrade psycopg2
     pip install --upgrade python-ldap

   This might require installation of development packages using your
   distribution's package manager.

- Make a folder for Kallithea data files, and configuration somewhere on the
  filesystem. For example::

    mkdir /srv/kallithea

- Go into the created directory and run this command to install Kallithea::

    pip install --upgrade kallithea

  Alternatively, download a .tar.gz from http://pypi.python.org/pypi/Kallithea,
  extract it and run::

    pip install --upgrade .

- This will install Kallithea together with all other required
  Python libraries into the activated virtualenv.

You can now proceed to :ref:`setup`.

.. _installation-without-virtualenv:


Installing a released version without virtualenv
------------------------------------------------

For installation without virtualenv, 'just' use::

    pip install kallithea

Note that this method requires root privileges and will install packages
globally without using the system's package manager.

To install as a regular user in ``~/.local``, you can use::

    pip install --user kallithea

You can now proceed to :ref:`setup`.


.. _virtualenv: http://pypi.python.org/pypi/virtualenv