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yamllint
========

A linter for YAML files.

yamllint does not only check for syntax validity, but for weirdnesses like key
repetition and cosmetic problems such as lines length, trailing spaces,
indentation, etc.

Written in Python (compatible with Python 3 only).

Documentation
-------------

https://yamllint.readthedocs.io/

Overview
--------

Screenshot
^^^^^^^^^^

.. image:: docs/screenshot.png
   :alt: yamllint screenshot

Installation
^^^^^^^^^^^^

Using pip, the Python package manager:

.. code:: bash

 pip install --user yamllint

yamllint is also packaged for all major operating systems, see installation
examples (``dnf``, ``apt-get``...) `in the documentation
<https://yamllint.readthedocs.io/en/stable/quickstart.html>`_.

Usage
^^^^^

.. code:: bash

 # Lint one or more files
 yamllint my_file.yml my_other_file.yaml ...

.. code:: bash

 # Lint all YAML files in a directory
 yamllint .

.. code:: bash

 # Use a pre-defined lint configuration
 yamllint -d relaxed file.yaml

 # Use a custom lint configuration
 yamllint -c /path/to/myconfig file-to-lint.yaml

.. code:: bash

 # Output a parsable format (for syntax checking in editors like Vim, emacs...)
 yamllint -f parsable file.yaml

`Read more in the complete documentation! <https://yamllint.readthedocs.io/>`__

Features
^^^^^^^^

Here is a yamllint configuration file example:

.. code:: yaml

 extends: default

 rules:
   # 80 chars should be enough, but don't fail if a line is longer
   line-length:
     max: 80
     level: warning

   # don't bother me with this rule
   indentation: disable

Within a YAML file, special comments can be used to disable checks for a single
line:

.. code:: yaml

 This line is waaaaaaaaaay too long  # yamllint disable-line

or for a whole block:

.. code:: yaml

 # yamllint disable rule:colons
 - Lorem       : ipsum
   dolor       : sit amet,
   consectetur : adipiscing elit
 # yamllint enable

Specific files can be ignored (totally or for some rules only) using a
``.gitignore``-style pattern:

.. code:: yaml

 # For all rules
 ignore: |
   *.dont-lint-me.yaml
   /bin/
   !/bin/*.lint-me-anyway.yaml

 rules:
   key-duplicates:
     ignore: |
       generated
       *.template.yaml
   trailing-spaces:
     ignore: |
       *.ignore-trailing-spaces.yaml
       /ascii-art/*

`Read more in the complete documentation! <https://yamllint.readthedocs.io/>`__


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