docs: refer to EXTRA_MAPPINGS in extensions instead of hacking LANGUAGES_EXTENSIONS_MAP directly

docs/usage/general.rst

@@ -1,173 +1,174 b''
 .. _general:
 
 =======================
 General Kallithea usage
 =======================
 
 
 Repository deletion
 -------------------
 
 When an admin or owner deletes a repository, Kallithea does
 not physically delete said repository from the filesystem, but instead
 renames it in a special way so that it is not possible to push, clone
 or access the repository.
 
 There is a special command for cleaning up such archived repositories::
 
     kallithea-cli repo-purge-deleted -c my.ini --older-than=30d
 
 This command scans for archived repositories that are older than
 30 days, displays them, and asks if you want to delete them (unless given
 the ``--no-ask`` flag). If you host a large amount of repositories with
 forks that are constantly being deleted, it is recommended that you run this
 command via crontab.
 
 It is worth noting that even if someone is given administrative access to
 Kallithea and deletes a repository, you can easily restore such an action by
 renaming the repository directory, removing the ``rm__<date>`` prefix.
 
 
 File view: follow current branch
 --------------------------------
 
 In the file view, left and right arrows allow to jump to the previous and next
 revision. Depending on the way revisions were created in the repository, this
 could jump to a different branch.  When the checkbox ``Follow current branch``
 is checked, these arrows will only jump to revisions on the same branch as the
 currently visible revision.  So for example, if someone is viewing files in the
 ``beta`` branch and marks the `Follow current branch` checkbox, the < and >
 arrows will only show revisions on the ``beta`` branch.
 
 
 Changelog features
 ------------------
 
 The core feature of a repository's ``changelog`` page is to show the revisions
 in a repository. However, there are several other features available from the
 changelog.
 
 Branch filter
   By default, the changelog shows revisions from all branches in the
   repository. Use the branch filter to restrict to a given branch.
 
 Viewing a changeset
   A particular changeset can be opened by clicking on either the changeset
   hash or the commit message, or by ticking the checkbox and clicking the
   ``Show selected changeset`` button at the top.
 
 Viewing all changes between two changesets
   To get a list of all changesets between two selected changesets, along with
   the changes in each one of them, tick the checkboxes of the first and
   last changeset in the desired range and click the ``Show selected changesets``
   button at the top. You can only show the range between the first and last
   checkbox (no cherry-picking).
 
   From that page, you can proceed to viewing the overall delta between the
   selected changesets, by clicking the ``Compare revisions`` button.
 
 Creating a pull request
   You can create a new pull request for the changes of a particular changeset
   (and its ancestors) by selecting it and clicking the ``Open new pull request
   for selected changesets`` button.
 
 
 Permanent repository URLs
 -------------------------
 
 Due to the complicated nature of repository grouping, URLs of repositories
 can often change. For example, a repository originally accessible from::
 
   http://kallithea.example.com/repo_name
 
 would get a new URL after moving it to test_group::
 
   http://kallithea.example.com/test_group/repo_name
 
 Such moving of a repository to a group can be an issue for build systems and
 other scripts where the repository paths are hardcoded. To mitigate this,
 Kallithea provides permanent URLs using the repository ID prefixed with an
 underscore. In all Kallithea URLs, for example those for the changelog and the
 file view, a repository name can be replaced by this ``_ID`` string. Since IDs
 are always the same, moving the repository to a different group will not affect
 such URLs.
 
 In the example, the repository could also be accessible as::
 
   http://kallithea.example.com/_<ID>
 
 The ID of a given repository can be shown from the repository ``Summary`` page,
 by selecting the ``Show by ID`` button next to ``Clone URL``.
 
 
 Email notifications
 -------------------
 
 With email settings properly configured in the Kallithea
 configuration file, Kallithea will send emails on user registration and when
 errors occur.
 
 Emails are also sent for comments on changesets. In this case, an email is sent
 to the committer of the changeset (if known to Kallithea), to all reviewers of
 the pull request (if applicable) and to all people mentioned in the comment
 using @mention notation.
 
 
 Trending source files
 ---------------------
 
 Trending source files are calculated based on a predefined dictionary of known
 types and extensions. If an extension is missing or you would like to scan
-custom files, it is possible to extend the ``LANGUAGES_EXTENSIONS_MAP``
-dictionary located in ``kallithea/config/conf.py`` with new types.
+custom files, it is possible to add additional file extensions with
+``EXTRA_MAPPINGS`` in your custom Kallithea extensions.py file. See
+:ref:`customization`.
 
 
 Cloning remote repositories
 ---------------------------
 
 Kallithea has the ability to clone repositories from given remote locations.
 
 If you need to clone repositories that are protected via basic authentication,
 you can pass the credentials in the URL, e.g.
 ``http://user:[e-mail]/repo``. Kallithea will then try to login and
 clone using the given credentials. Please note that the given credentials will
 be stored as plaintext inside the database. However, the authentication
 information will not be shown in the clone URL on the summary page.
 
 
 Specific features configurable in the Admin settings
 ----------------------------------------------------
 
 In general, the Admin settings should be self-explanatory and will not be
 described in more detail in this documentation. However, there are a few
 features that merit further explanation.
 
 Repository extra fields
 ^^^^^^^^^^^^^^^^^^^^^^^
 
 In the *Visual* tab, there is an option "Use repository extra
 fields", which allows to set custom fields for each repository in the system.
 
 Once enabled site-wide, the custom fields can be edited per-repository under
 *Options* | *Settings* | *Extra Fields*.
 
 Example usage of such fields would be to define company-specific information
 into repositories, e.g., defining a ``repo_manager`` key that would give info
 about a manager of each repository.  There's no limit for adding custom fields.
 Newly created fields are accessible via the API.
 
 Meta tagging
 ^^^^^^^^^^^^
 
 In the *Visual* tab, option "Stylify recognised meta tags" will cause Kallithea
 to turn certain text fragments in repository and repository group
 descriptions into colored tags. Currently recognised tags are::
 
     [featured]
     [stale]
     [dead]
     [lang => lang]
     [license => License]
     [requires => Repo]
     [recommends => Repo]
     [see => URI]