yamllint version 0.5.1

The `pyyaml` dependency is needed in `install_requires` but also in
`setup_requires`, because running `setup.py` requires importing
`yamllint`, which itself imports `yaml`.

.gitignore

@@ -1,2 +1,3 @@
 __pycache__
 *.py[cod]
+/docs/_build

README.md

@@ -1,6 +0,0 @@
-# yamllint
-
-A linter for YAML files.
-
-[![Build Status](https://travis-ci.org/adrienverge/yamllint.svg?branch=master)](https://travis-ci.org/adrienverge/yamllint)
-[![Coverage Status](https://coveralls.io/repos/adrienverge/yamllint/badge.svg?branch=master&service=github)](https://coveralls.io/github/adrienverge/yamllint?branch=master)

README.rst

@@ -0,0 +1,62 @@
+yamllint
+========
+
+A linter for YAML files.
+
+.. image::
+   https://travis-ci.org/adrienverge/yamllint.svg?branch=master
+   :target: https://travis-ci.org/adrienverge/yamllint
+   :alt: CI tests status
+.. image::
+   https://coveralls.io/repos/github/adrienverge/yamllint/badge.svg?branch=master
+   :target: https://coveralls.io/github/adrienverge/yamllint?branch=master
+   :alt: Code coverage status
+.. image:: https://readthedocs.org/projects/yamllint/badge/?version=latest
+   :target: http://yamllint.readthedocs.org/en/latest/?badge=latest
+   :alt: Documentation status
+
+Written in Python (compatible with Python 2 & 3).
+
+Documentation
+-------------
+
+http://yamllint.readthedocs.org/
+
+Short overview
+--------------
+
+Screenshot
+^^^^^^^^^^
+
+.. image:: docs/screenshot.png
+   :alt: yamllint screenshot
+
+Installation
+^^^^^^^^^^^^
+
+.. code:: bash
+
+ pip install yamllint
+
+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 custom lint configuration
+ yamllint -c ~/myconfig file.yml
+
+.. code:: bash
+
+ # Output a parsable format (for syntax checking in editors like Vim, emacs...)
+ yamllint -f parsable file.yml

bin/yamllint

@@ -15,68 +15,10 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from __future__ import print_function
-import os.path
 import sys
 
-import argparse
-
-from yamllint import APP_DESCRIPTION, APP_NAME, APP_VERSION
-from yamllint import config
-from yamllint.errors import YamlLintConfigError
-from yamllint import lint
-from yamllint import output
+from yamllint import cli
 
 
 if __name__ == '__main__':
-    parser = argparse.ArgumentParser(prog=APP_NAME,
-                                     description=APP_DESCRIPTION)
-    parser.add_argument('files', metavar='FILES', nargs='+',
-                        help='files to check')
-    parser.add_argument('-c', '--config', dest='config_file', action='store',
-                        help='path to a custom configuration')
-    parser.add_argument('-f', '--format',
-                        choices=('parsable', 'standard'), default='standard',
-                        help='format for parsing output')
-    parser.add_argument('-v', '--version', action='version',
-                        version='%s %s' % (APP_NAME, APP_VERSION))
-
-    # TODO: read from stdin when no filename?
-
-    args = parser.parse_args()
-
-    try:
-        if args.config_file is not None:
-            conf = config.parse_config_from_file(args.config_file)
-        elif os.path.isfile('.yamllint'):
-            conf = config.parse_config_from_file('.yamllint')
-        else:
-            conf = config.parse_config('extends: default')
-    except YamlLintConfigError as e:
-        print(e, file=sys.stderr)
-        sys.exit(-1)
-
-    return_code = 0
-
-    for file in args.files:
-        if args.format != 'parsable':
-            print('\033[4m%s\033[0m' % file)
-
-        try:
-            with open(file) as f:
-                for problem in lint(f, conf):
-                    if args.format == 'parsable':
-                        print(output.parsable_format(problem, file))
-                    else:
-                        print(output.standard_format(problem, file))
-
-                    if return_code == 0 and problem.level == 'error':
-                        return_code = 1
-        except EnvironmentError as e:
-            print(e)
-            return_code = -1
-
-        if args.format != 'parsable':
-            print('')
-
-    sys.exit(return_code)
+    cli.run(sys.argv[1:])

docs/Makefile

@@ -0,0 +1,177 @@
+# Makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+PAPER         =
+BUILDDIR      = _build
+
+# User-friendly check for sphinx-build
+ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
+$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from http://sphinx-doc.org/)
+endif
+
+# Internal variables.
+PAPEROPT_a4     = -D latex_paper_size=a4
+PAPEROPT_letter = -D latex_paper_size=letter
+ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+# the i18n builder cannot share the environment and doctrees with the others
+I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+
+.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext
+
+help:
+	@echo "Please use \`make <target>' where <target> is one of"
+	@echo "  html       to make standalone HTML files"
+	@echo "  dirhtml    to make HTML files named index.html in directories"
+	@echo "  singlehtml to make a single large HTML file"
+	@echo "  pickle     to make pickle files"
+	@echo "  json       to make JSON files"
+	@echo "  htmlhelp   to make HTML files and a HTML help project"
+	@echo "  qthelp     to make HTML files and a qthelp project"
+	@echo "  devhelp    to make HTML files and a Devhelp project"
+	@echo "  epub       to make an epub"
+	@echo "  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
+	@echo "  latexpdf   to make LaTeX files and run them through pdflatex"
+	@echo "  latexpdfja to make LaTeX files and run them through platex/dvipdfmx"
+	@echo "  text       to make text files"
+	@echo "  man        to make manual pages"
+	@echo "  texinfo    to make Texinfo files"
+	@echo "  info       to make Texinfo files and run them through makeinfo"
+	@echo "  gettext    to make PO message catalogs"
+	@echo "  changes    to make an overview of all changed/added/deprecated items"
+	@echo "  xml        to make Docutils-native XML files"
+	@echo "  pseudoxml  to make pseudoxml-XML files for display purposes"
+	@echo "  linkcheck  to check all external links for integrity"
+	@echo "  doctest    to run all doctests embedded in the documentation (if enabled)"
+
+clean:
+	rm -rf $(BUILDDIR)/*
+
+html:
+	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
+	@echo
+	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
+
+dirhtml:
+	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
+	@echo
+	@echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml."
+
+singlehtml:
+	$(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
+	@echo
+	@echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml."
+
+pickle:
+	$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
+	@echo
+	@echo "Build finished; now you can process the pickle files."
+
+json:
+	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
+	@echo
+	@echo "Build finished; now you can process the JSON files."
+
+htmlhelp:
+	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
+	@echo
+	@echo "Build finished; now you can run HTML Help Workshop with the" \
+	      ".hhp project file in $(BUILDDIR)/htmlhelp."
+
+qthelp:
+	$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
+	@echo
+	@echo "Build finished; now you can run "qcollectiongenerator" with the" \
+	      ".qhcp project file in $(BUILDDIR)/qthelp, like this:"
+	@echo "# qcollectiongenerator $(BUILDDIR)/qthelp/yamllint.qhcp"
+	@echo "To view the help file:"
+	@echo "# assistant -collectionFile $(BUILDDIR)/qthelp/yamllint.qhc"
+
+devhelp:
+	$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
+	@echo
+	@echo "Build finished."
+	@echo "To view the help file:"
+	@echo "# mkdir -p $$HOME/.local/share/devhelp/yamllint"
+	@echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/yamllint"
+	@echo "# devhelp"
+
+epub:
+	$(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
+	@echo
+	@echo "Build finished. The epub file is in $(BUILDDIR)/epub."
+
+latex:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo
+	@echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex."
+	@echo "Run \`make' in that directory to run these through (pdf)latex" \
+	      "(use \`make latexpdf' here to do that automatically)."
+
+latexpdf:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo "Running LaTeX files through pdflatex..."
+	$(MAKE) -C $(BUILDDIR)/latex all-pdf
+	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
+
+latexpdfja:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo "Running LaTeX files through platex and dvipdfmx..."
+	$(MAKE) -C $(BUILDDIR)/latex all-pdf-ja
+	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
+
+text:
+	$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
+	@echo
+	@echo "Build finished. The text files are in $(BUILDDIR)/text."
+
+man:
+	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
+	@echo
+	@echo "Build finished. The manual pages are in $(BUILDDIR)/man."
+
+texinfo:
+	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
+	@echo
+	@echo "Build finished. The Texinfo files are in $(BUILDDIR)/texinfo."
+	@echo "Run \`make' in that directory to run these through makeinfo" \
+	      "(use \`make info' here to do that automatically)."
+
+info:
+	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
+	@echo "Running Texinfo files through makeinfo..."
+	make -C $(BUILDDIR)/texinfo info
+	@echo "makeinfo finished; the Info files are in $(BUILDDIR)/texinfo."
+
+gettext:
+	$(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale
+	@echo
+	@echo "Build finished. The message catalogs are in $(BUILDDIR)/locale."
+
+changes:
+	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
+	@echo
+	@echo "The overview file is in $(BUILDDIR)/changes."
+
+linkcheck:
+	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
+	@echo
+	@echo "Link check complete; look for any errors in the above output " \
+	      "or in $(BUILDDIR)/linkcheck/output.txt."
+
+doctest:
+	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
+	@echo "Testing of doctests in the sources finished, look at the " \
+	      "results in $(BUILDDIR)/doctest/output.txt."
+
+xml:
+	$(SPHINXBUILD) -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml
+	@echo
+	@echo "Build finished. The XML files are in $(BUILDDIR)/xml."
+
+pseudoxml:
+	$(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
+	@echo
+	@echo "Build finished. The pseudo-XML files are in $(BUILDDIR)/pseudoxml."

docs/conf.py

@@ -0,0 +1,43 @@
+# -*- coding: utf-8 -*-
+# yamllint documentation build configuration file, created by
+# sphinx-quickstart on Thu Jan 21 21:18:52 2016.
+
+import sys
+import os
+
+sys.path.insert(0, os.path.abspath('..'))  # noqa
+
+from yamllint import __copyright__, APP_NAME, APP_VERSION
+
+# -- General configuration ------------------------------------------------
+
+extensions = [
+    'sphinx.ext.autodoc',
+]
+
+source_suffix = '.rst'
+
+master_doc = 'index'
+
+project = APP_NAME
+copyright = __copyright__
+
+version = APP_VERSION
+release = APP_VERSION
+
+pygments_style = 'sphinx'
+
+# -- Options for HTML output ----------------------------------------------
+
+html_theme = 'default'
+
+htmlhelp_basename = 'yamllintdoc'
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    ('index', 'yamllint', u'yamllint Documentation',
+     [u'Adrien Vergé'], 1)
+]

docs/configuration.rst

@@ -0,0 +1,74 @@
+Configuration
+=============
+
+yamllint uses a set of *rules* to check sources files for problems. Each rule is
+independent from the others, and can be enabled, disabled or tweaked. All these
+settings can be gathered in a configuration file.
+
+To use a custom configuration file, either name it ``.yamllint`` in your working
+directory, or use the ``-c`` option:
+
+::
+
+ yamllint -c ~/myconfig file.yml
+
+Default configuration
+---------------------
+
+Unless told otherwise, yamllint uses its ``default`` configuration:
+
+.. literalinclude:: ../yamllint/conf/default.yml
+   :language: yaml
+
+Details on rules can be found on :doc:`the rules page <rules>`.
+
+Extending the default configuration
+-----------------------------------
+
+When writing a custom configuration file, you don't need to redefine every rule.
+Just extend the ``default`` configuration (or any already-existing configuration
+file).
+
+For instance, if you just want to disable the ``comments-indentation`` rule,
+your file could look like this:
+
+.. code-block:: yaml
+
+ # This is my first, very own configuration file for yamllint!
+ # It extends the default conf by adjusting some options.
+
+ extends: default
+
+ rules:
+   comments-indentation: disable  # don't bother me with this rule
+
+Similarly, if you want to set the ``line-length`` rule as a warning and be less
+strict on block sequences indentation:
+
+.. code-block:: yaml
+
+ extends: default
+
+ rules:
+   # 80 should be enough, but don't fail if a line is longer
+   line-length:
+     max: 80
+     level: warning
+
+   # accept both     key:
+   #                   - item
+   #
+   # and             key:
+   #                 - item
+   indentation:
+     indent-sequences: whatever
+
+Errors and warnings
+-------------------
+
+Problems detected by yamllint can be raised either as errors or as warnings.
+
+In both cases, the script will output them (with different colors when using the
+``standard`` output format), but the exit code can be different. More precisely,
+the script will exit will a failure code *only when* there is one or more
+error(s).

docs/development.rst

@@ -0,0 +1,11 @@
+Development
+===========
+
+yamllint provides both a script and a Python module. The latter can be used to
+write your own linting tools:
+
+.. autoclass:: yamllint.errors.LintProblem
+   :members:
+
+.. automodule:: yamllint
+   :members:

docs/index.rst

@@ -0,0 +1,27 @@
+yamllint documentation
+======================
+
+A linter for YAML files.
+
+Screenshot
+----------
+
+.. image:: screenshot.png
+   :alt: yamllint screenshot
+
+.. note::
+
+   The default output format is inspired by `eslint <http://eslint.org/>`_, a
+   great linting tool for Javascript.
+
+Table of contents
+-----------------
+
+.. toctree::
+   :maxdepth: 2
+
+   quickstart
+   configuration
+   rules
+   development
+   text_editors

docs/quickstart.rst

@@ -0,0 +1,72 @@
+Quickstart
+==========
+
+Installing yamllint
+-------------------
+
+First, install yamllint. The easiest way is to use pip, the Python package
+manager:
+
+::
+
+ sudo pip install yamllint
+
+If you prefer installing from source, you can run, from the source directory:
+
+::
+
+ python setup.py sdist
+ sudo pip install dist/yamllint-*.tar.gz
+
+Running yamllint
+----------------
+
+Basic usage:
+
+::
+
+ yamllint file.yml other-file.yaml
+
+You can also lint all YAML files in a whole directory:
+
+::
+
+ yamllint .
+
+The output will look like (colors are not displayed here):
+
+::
+
+ file.yml
+   6:2       warning  missing starting space in comment  (comments)
+   57:1      error    trailing spaces  (trailing-spaces)
+   60:3      error    wrong indentation: expected 4 but found 2  (indentation)
+
+ other-file.yml
+   1:1       warning  missing document start "---"  (document-start)
+   9:81      error    line too long (84 > 80 characters)  (line-length)
+   31:1      error    too many blank lines (4 > 2)  (empty-lines)
+   37:12     error    too many spaces inside braces  (braces)
+
+Add the ``-f parsable`` arguments if you need an output format parsable by a
+machine (for instance for :doc:`syntax highlighting in text editors
+<text_editors>`). The output will then look like:
+
+::
+
+ file.yml:6:2: [warning] missing starting space in comment (comments)
+ file.yml:57:1: [error] trailing spaces (trailing-spaces)
+ file.yml:60:3: [error] wrong indentation: expected 4 but found 2 (indentation)
+
+If you have a custom linting configuration file (see :doc:`how to configure
+yamllint <configuration>`), it can be passed to yamllint using the ``-c``
+option:
+
+::
+
+ yamllint -c ~/myconfig file.yml
+
+.. note::
+
+   If you have a ``.yamllint`` file in your working directory, it will be
+   automatically loaded as configuration by yamllint.

docs/rules.rst

@@ -0,0 +1,90 @@
+Rules
+=====
+
+When linting a document with yamllint, a series of rules (such as
+``line-length``, ``trailing-spaces``, etc.) are checked against.
+
+A :doc:`configuration file <configuration>` can be used to enable or disable
+these rules, to set their level (*error* or *warning*), but also to tweak their
+options.
+
+This page describes the rules and their options.
+
+.. contents:: List of rules
+   :local:
+   :depth: 1
+
+braces
+------
+
+.. automodule:: yamllint.rules.braces
+
+brackets
+--------
+
+.. automodule:: yamllint.rules.brackets
+
+colons
+------
+
+.. automodule:: yamllint.rules.colons
+
+commas
+------
+
+.. automodule:: yamllint.rules.commas
+
+comments
+--------
+
+.. automodule:: yamllint.rules.comments
+
+comments-indentation
+--------------------
+
+.. automodule:: yamllint.rules.comments_indentation
+
+document-end
+------------
+
+.. automodule:: yamllint.rules.document_end
+
+document-start
+--------------
+
+.. automodule:: yamllint.rules.document_start
+
+empty-lines
+-----------
+
+.. automodule:: yamllint.rules.empty_lines
+
+hyphens
+-------
+
+.. automodule:: yamllint.rules.hyphens
+
+indentation
+-----------
+
+.. automodule:: yamllint.rules.indentation
+
+line-length
+-----------
+
+.. automodule:: yamllint.rules.line_length
+
+new-line-at-end-of-file
+-----------------------
+
+.. automodule:: yamllint.rules.new_line_at_end_of_file
+
+new-lines
+---------
+
+.. automodule:: yamllint.rules.new_lines
+
+trailing-spaces
+---------------
+
+.. automodule:: yamllint.rules.trailing_spaces

docs/text_editors.rst

@@ -0,0 +1,40 @@
+Integration with text editors
+=============================
+
+Most text editors support syntax checking and highlighting, to visually report
+syntax errors and warnings to the user. yamllint can be used to syntax-check
+YAML source, but a bit of configuration is required depending on your favorite
+text editor.
+
+Vim
+---
+
+Assuming that the `syntastic <https://github.com/scrooloose/syntastic>`_ plugin
+is installed, add to your ``.vimrc``:
+
+::
+
+ TODO
+
+Neovim
+------
+
+Assuming that the `neomake <https://github.com/benekastah/neomake>`_ plugin is
+installed, add to your ``.config/nvim/init.vim``:
+
+::
+
+ if executable('yamllint')
+   let g:neomake_yaml_yamllint_maker = {
+     \ 'args': ['-f', 'parsable'],
+     \ 'errorformat': '%E%f:%l:%c: [error] %m,%W%f:%l:%c: [warning] %m' }
+   let g:neomake_yaml_enabled_makers = ['yamllint']
+ endif
+
+Other text editors
+------------------
+
+.. rubric:: Help wanted!
+
+Your favorite text editor is not listed here? Help us improve by adding a
+section (by opening a pull-request or issue on GitHub).

setup.py

@@ -26,7 +26,7 @@ setup(
     author=__author__,
     description=APP_DESCRIPTION,
     license=__license__,
-    keywords=['yaml', 'lint', 'linter'],
+    keywords=['yaml', 'lint', 'linter', 'syntax', 'checker'],
     url='https://github.com/adrienverge/yamllint',
     classifiers=[
         'Development Status :: 4 - Beta',
@@ -45,6 +45,8 @@ setup(
     scripts=['bin/yamllint'],
     package_data={'yamllint': ['conf/*.yml']},
     install_requires=['pyyaml'],
+    setup_requires=['pyyaml'],  # importing `yamllint` (for APP_NAME etc.)
+                                # requires importing `yaml`
     tests_require=['nose'],
     test_suite='nose.collector',
 )

tests/rules/common.py

@@ -33,12 +33,19 @@ class RuleTestCase(unittest.TestCase):
                 'rules': conf}
         return parse_config(yaml.safe_dump(conf))
 
-    def check(self, source, conf, line=None, column=None, **kwargs):
+    def check(self, source, conf, **kwargs):
         expected_problems = []
         for key in kwargs:
             assert key.startswith('problem')
+            if len(kwargs[key]) > 2:
+                if kwargs[key][2] == 'syntax':
+                    rule_id = None
+                else:
+                    rule_id = kwargs[key][2]
+            else:
+                rule_id = self.rule_id
             expected_problems.append(
-                LintProblem(kwargs[key][0], kwargs[key][1], rule=self.rule_id))
+                LintProblem(kwargs[key][0], kwargs[key][1], rule=rule_id))
         expected_problems.sort()
 
         real_problems = list(lint(source, self.build_fake_config(conf)))

tests/rules/test_colons.py

@@ -42,7 +42,7 @@ class ColonTestCase(RuleTestCase):
                    '    - p: kdjf\n'
                    '    - q: val0\n'
                    '    - q2:\n'
-                   '      - val1\n'
+                   '        - val1\n'
                    '...\n', conf)
         self.check('---\n'
                    'object:\n'
@@ -67,7 +67,7 @@ class ColonTestCase(RuleTestCase):
                    '    - o: {k1: v1}\n'
                    '    - o:  {k1: v1}\n'
                    '    - q2:\n'
-                   '      - val1\n'
+                   '        - val1\n'
                    '...\n', conf)
         self.check('---\n'
                    'a: {b: {c:  d, e : f}}\n', conf)
@@ -94,7 +94,7 @@ class ColonTestCase(RuleTestCase):
                    '...\n', conf, problem=(2, 4))
         self.check('---\n'
                    '- lib :\n'
-                   '  - var\n'
+                   '    - var\n'
                    '...\n', conf, problem=(2, 6))
         self.check('---\n'
                    'a: {b: {c : d, e : f}}\n', conf,
@@ -118,7 +118,7 @@ class ColonTestCase(RuleTestCase):
                    '...\n', conf, problem=(3, 8))
 
     def test_before_with_explicit_block_mappings(self):
-        conf = 'colons: {max-spaces-before: 0, max-spaces-after: -1}'
+        conf = 'colons: {max-spaces-before: 0, max-spaces-after: 1}'
         self.check('---\n'
                    'object:\n'
                    '  ? key\n'
@@ -129,6 +129,30 @@ class ColonTestCase(RuleTestCase):
                    '  ? key\n'
                    '  : value\n'
                    '...\n', conf, problem=(2, 7))
+        self.check('---\n'
+                   '? >\n'
+                   '    multi-line\n'
+                   '    key\n'
+                   ': >\n'
+                   '    multi-line\n'
+                   '    value\n'
+                   '...\n', conf)
+        self.check('---\n'
+                   '- ? >\n'
+                   '      multi-line\n'
+                   '      key\n'
+                   '  : >\n'
+                   '      multi-line\n'
+                   '      value\n'
+                   '...\n', conf)
+        self.check('---\n'
+                   '- ? >\n'
+                   '      multi-line\n'
+                   '      key\n'
+                   '  :  >\n'
+                   '       multi-line\n'
+                   '       value\n'
+                   '...\n', conf, problem=(5, 5))
 
     def test_after_enabled(self):
         conf = 'colons: {max-spaces-before: -1, max-spaces-after: 1}'
@@ -152,6 +176,21 @@ class ColonTestCase(RuleTestCase):
                    'a: {b: {c:  d, e :  f}}\n', conf,
                    problem1=(2, 12), problem2=(2, 20))
 
+    def test_after_enabled_question_mark(self):
+        conf = 'colons: {max-spaces-before: -1, max-spaces-after: 1}'
+        self.check('---\n'
+                   '? key\n'
+                   ': value\n', conf)
+        self.check('---\n'
+                   '?  key\n'
+                   ': value\n', conf, problem=(2, 3))
+        self.check('---\n'
+                   '?  key\n'
+                   ':  value\n', conf, problem1=(2, 3), problem2=(3, 3))
+        self.check('---\n'
+                   '- ?  key\n'
+                   '  :  value\n', conf, problem1=(2, 5), problem2=(3, 5))
+
     def test_after_max(self):
         conf = 'colons: {max-spaces-before: -1, max-spaces-after: 3}'
         self.check('---\n'

tests/rules/test_commas.py

@@ -152,3 +152,36 @@ class CommaTestCase(RuleTestCase):
                    problem1=(2, 12), problem2=(2, 16), problem3=(2, 31),
                    problem4=(2, 36), problem5=(2, 50), problem6=(4, 8),
                    problem7=(5, 11), problem8=(8, 13))
+
+    def test_comma_on_new_line(self):
+        conf = 'commas: {max-spaces-before: 0, max-spaces-after: 1}'
+        self.check('---\n'
+                   'flow-seq: [1, 2, 3\n'
+                   '           , 4, 5, 6]\n'
+                   '...\n', conf, problem=(3, 11))
+        self.check('---\n'
+                   'flow-map: {a: 1, b: 2\n'
+                   '           , c: 3}\n'
+                   '...\n', conf, problem=(3, 11))
+        conf = ('commas: {max-spaces-before: 0, max-spaces-after: 1}\n'
+                'indentation: disable\n')
+        self.check('---\n'
+                   'flow-seq: [1, 2, 3\n'
+                   '         , 4, 5, 6]\n'
+                   '...\n', conf, problem=(3, 9))
+        self.check('---\n'
+                   'flow-map: {a: 1, b: 2\n'
+                   '         , c: 3}\n'
+                   '...\n', conf, problem=(3, 9))
+        self.check('---\n'
+                   '[\n'
+                   '1,\n'
+                   '2\n'
+                   ', 3\n'
+                   ']\n', conf, problem=(5, 1))
+        self.check('---\n'
+                   '{\n'
+                   'a: 1,\n'
+                   'b: 2\n'
+                   ', c: 3\n'
+                   '}\n', conf, problem=(5, 1))

tests/rules/test_comments.py

@@ -131,3 +131,19 @@ class CommentsTestCase(RuleTestCase):
                 '  require-starting-space: yes\n'
                 '  min-spaces-from-content: 2\n')
         self.check('# comment\n', conf)
+
+    def test_multi_line_scalar(self):
+        conf = ('comments:\n'
+                '  require-starting-space: yes\n'
+                '  min-spaces-from-content: 2\n'
+                'trailing-spaces: disable\n')
+        self.check('---\n'
+                   'string: >\n'
+                   '  this is plain text\n'
+                   '\n'
+                   '# comment\n', conf)
+        self.check('---\n'
+                   '- string: >\n'
+                   '    this is plain text\n'
+                   '  \n'
+                   '  # comment\n', conf)

tests/rules/test_comments_indentation.py

@@ -88,15 +88,39 @@ class CommentsIndentationTestCase(RuleTestCase):
         self.check('---\n'
                    'obj1:\n'
                    '  a: 1\n'
-                   '  # comments\n'
+                   '  # the following line is disabled\n'
+                   '  # b: 2\n', conf)
+        self.check('---\n'
+                   'obj1:\n'
+                   '  a: 1\n'
+                   '  # b: 2\n'
                    '\n'
                    'obj2:\n'
-                   '  b: 2\n', conf, problem=(4, 3))
+                   '  b: 2\n', conf)
+        self.check('---\n'
+                   'obj1:\n'
+                   '  a: 1\n'
+                   '  # b: 2\n'
+                   '# this object is useless\n'
+                   'obj2: no\n', conf)
+        self.check('---\n'
+                   'obj1:\n'
+                   '  a: 1\n'
+                   '# this object is useless\n'
+                   '  # b: 2\n'
+                   'obj2: no\n', conf, problem=(5, 3))
         self.check('---\n'
                    'obj1:\n'
                    '  a: 1\n'
                    '  # comments\n'
                    '  b: 2\n', conf)
+        self.check('---\n'
+                   'my list for today:\n'
+                   '  - todo 1\n'
+                   '  - todo 2\n'
+                   '  # commented for now\n'
+                   '  # - todo 3\n'
+                   '...\n', conf)
 
     def test_first_line(self):
         conf = 'comments-indentation: {}'

tests/rules/test_common.py

@@ -18,10 +18,32 @@ import unittest
 
 import yaml
 
-from yamllint.rules.common import Comment, get_comments_between_tokens
+from yamllint.rules.common import (Comment, get_line_indent,
+                                   get_comments_between_tokens)
 
 
 class CommonTestCase(unittest.TestCase):
+    def test_get_line_indent(self):
+        tokens = list(yaml.scan('a: 1\n'
+                                'b:\n'
+                                '  - c: [2, 3, {d: 4}]\n'))
+
+        self.assertEqual(tokens[3].value, 'a')
+        self.assertEqual(tokens[5].value, '1')
+        self.assertEqual(tokens[7].value, 'b')
+        self.assertEqual(tokens[13].value, 'c')
+        self.assertEqual(tokens[16].value, '2')
+        self.assertEqual(tokens[18].value, '3')
+        self.assertEqual(tokens[22].value, 'd')
+        self.assertEqual(tokens[24].value, '4')
+
+        for i in (3, 5):
+            self.assertEqual(get_line_indent(tokens[i]), 0)
+        for i in (7,):
+            self.assertEqual(get_line_indent(tokens[i]), 0)
+        for i in (13, 16, 18, 22, 24):
+            self.assertEqual(get_line_indent(tokens[i]), 2)
+
     def check_comments(self, buffer, *expected):
         yaml_loader = yaml.BaseLoader(buffer)
 

tests/rules/test_document_start.py

@@ -82,7 +82,7 @@ class DocumentStartTestCase(RuleTestCase):
                    '...\n'
                    'second: document\n'
                    '---\n'
-                   'third: document\n', conf, problem=(4, 1))
+                   'third: document\n', conf, problem=(4, 1, 'syntax'))
 
     def test_directives(self):
         conf = 'document-start: {present: yes}'

tests/rules/test_hyphens.py

@@ -36,12 +36,12 @@ class HyphenTestCase(RuleTestCase):
                    '- elem2\n', conf)
         self.check('---\n'
                    'object:\n'
-                   '- elem1\n'
-                   '-  elem2\n', conf)
+                   '  - elem1\n'
+                   '  -  elem2\n', conf)
         self.check('---\n'
                    'object:\n'
-                   '-  elem1\n'
-                   '-  elem2\n', conf)
+                   '  -  elem1\n'
+                   '  -  elem2\n', conf)
         self.check('---\n'
                    'object:\n'
                    '  subobject:\n'
@@ -69,12 +69,12 @@ class HyphenTestCase(RuleTestCase):
                    '- elem2\n', conf, problem=(2, 3))
         self.check('---\n'
                    'object:\n'
-                   '- elem1\n'
-                   '-  elem2\n', conf, problem=(4, 3))
+                   '  - elem1\n'
+                   '  -  elem2\n', conf, problem=(4, 5))
         self.check('---\n'
                    'object:\n'
-                   '-  elem1\n'
-                   '-  elem2\n', conf, problem1=(3, 3), problem2=(4, 3))
+                   '  -  elem1\n'
+                   '  -  elem2\n', conf, problem1=(3, 5), problem2=(4, 5))
         self.check('---\n'
                    'object:\n'
                    '  subobject:\n'

tests/rules/test_indentation.py

@@ -48,37 +48,205 @@ class IndentationTestCase(RuleTestCase):
                    '...\n', conf)
 
     def test_one_space(self):
-        conf = 'indentation: {spaces: 1}'
+        conf = 'indentation: {spaces: 1, indent-sequences: no}'
+        self.check('---\n'
+                   'object:\n'
+                   ' k1:\n'
+                   ' - a\n'
+                   ' - b\n'
+                   ' k2: v2\n'
+                   ' k3:\n'
+                   ' - name: Unix\n'
+                   '   date: 1969\n'
+                   ' - name: Linux\n'
+                   '   date: 1991\n'
+                   '...\n', conf)
+        conf = 'indentation: {spaces: 1, indent-sequences: yes}'
         self.check('---\n'
                    'object:\n'
                    ' k1:\n'
                    '  - a\n'
                    '  - b\n'
                    ' k2: v2\n'
+                   ' k3:\n'
+                   '  - name: Unix\n'
+                   '    date: 1969\n'
+                   '  - name: Linux\n'
+                   '    date: 1991\n'
                    '...\n', conf)
 
     def test_two_spaces(self):
-        conf = 'indentation: {spaces: 2}'
+        conf = 'indentation: {spaces: 2, indent-sequences: no}'
+        self.check('---\n'
+                   'object:\n'
+                   '  k1:\n'
+                   '  - a\n'
+                   '  - b\n'
+                   '  k2: v2\n'
+                   '  k3:\n'
+                   '  - name: Unix\n'
+                   '    date: 1969\n'
+                   '  - name: Linux\n'
+                   '    date: 1991\n'
+                   '...\n', conf)
+        conf = 'indentation: {spaces: 2, indent-sequences: yes}'
         self.check('---\n'
                    'object:\n'
                    '  k1:\n'
                    '    - a\n'
                    '    - b\n'
                    '  k2: v2\n'
+                   '  k3:\n'
+                   '    - name: Unix\n'
+                   '      date: 1969\n'
+                   '    - name: Linux\n'
+                   '      date: 1991\n'
                    '...\n', conf)
 
     def test_three_spaces(self):
-        conf = 'indentation: {spaces: 3}'
+        conf = 'indentation: {spaces: 3, indent-sequences: no}'
+        self.check('---\n'
+                   'object:\n'
+                   '   k1:\n'
+                   '   - a\n'
+                   '   - b\n'
+                   '   k2: v2\n'
+                   '   k3:\n'
+                   '   - name: Unix\n'
+                   '     date: 1969\n'
+                   '   - name: Linux\n'
+                   '     date: 1991\n'
+                   '...\n', conf)
+        conf = 'indentation: {spaces: 3, indent-sequences: yes}'
         self.check('---\n'
                    'object:\n'
                    '   k1:\n'
                    '      - a\n'
                    '      - b\n'
                    '   k2: v2\n'
+                   '   k3:\n'
+                   '      - name: Unix\n'
+                   '        date: 1969\n'
+                   '      - name: Linux\n'
+                   '        date: 1991\n'
                    '...\n', conf)
 
-    def test_under_indented(self):
+    def test_indent_sequences_whatever(self):
+        conf = 'indentation: {spaces: 4, indent-sequences: whatever}'
+        self.check('---\n'
+                   'list one:\n'
+                   '- 1\n'
+                   '- 2\n'
+                   '- 3\n'
+                   'list two:\n'
+                   '    - a\n'
+                   '    - b\n'
+                   '    - c\n', conf)
+        self.check('---\n'
+                   'list one:\n'
+                   '  - 1\n'
+                   '  - 2\n'
+                   '  - 3\n'
+                   'list two:\n'
+                   '    - a\n'
+                   '    - b\n'
+                   '    - c\n', conf, problem=(3, 3))
+        self.check('---\n'
+                   'list one:\n'
+                   '- 1\n'
+                   '- 2\n'
+                   '- 3\n'
+                   'list two:\n'
+                   '  - a\n'
+                   '  - b\n'
+                   '  - c\n', conf, problem=(7, 3))
+        self.check('---\n'
+                   'list:\n'
+                   '    - 1\n'
+                   '    - 2\n'
+                   '    - 3\n'
+                   '- a\n'
+                   '- b\n'
+                   '- c\n', conf, problem=(6, 1, 'syntax'))
+
+    def test_flow_mappings(self):
         conf = 'indentation: {spaces: 2}'
+        self.check('---\n'
+                   'a: {x: 1,\n'
+                   '    y,\n'
+                   '    z: 1}\n', conf)
+        self.check('---\n'
+                   'a: {x: 1,\n'
+                   '   y,\n'
+                   '    z: 1}\n', conf, problem=(3, 4))
+        self.check('---\n'
+                   'a: {x: 1,\n'
+                   '     y,\n'
+                   '    z: 1}\n', conf, problem=(3, 6))
+        self.check('---\n'
+                   'a: {x: 1,\n'
+                   '  y, z: 1\n'
+                   '}\n', conf, problem=(3, 3))
+        self.check('---\n'
+                   'a: {\n'
+                   '  x: 1,\n'
+                   '  y, z: 1\n'
+                   '}\n', conf)
+        self.check('---\n'
+                   'a: {\n'
+                   '  x: 1,\n'
+                   '  y, z: 1}\n', conf)
+        self.check('---\n'
+                   'a: {\n'
+                   '   x: 1,\n'
+                   '  y, z: 1\n'
+                   '}\n', conf, problem=(3, 4))
+        self.check('---\n'
+                   'a: {\n'
+                   '  x: 1,\n'
+                   '  y, z: 1\n'
+                   '  }\n', conf, problem=(5, 3))
+
+    def test_flow_sequences(self):
+        conf = 'indentation: {spaces: 2}'
+        self.check('---\n'
+                   'a: [x,\n'
+                   '    y,\n'
+                   '    z]\n', conf)
+        self.check('---\n'
+                   'a: [x,\n'
+                   '   y,\n'
+                   '    z]\n', conf, problem=(3, 4))
+        self.check('---\n'
+                   'a: [x,\n'
+                   '     y,\n'
+                   '    z]\n', conf, problem=(3, 6))
+        self.check('---\n'
+                   'a: [x,\n'
+                   '  y, z\n'
+                   ']\n', conf, problem=(3, 3))
+        self.check('---\n'
+                   'a: [\n'
+                   '  x,\n'
+                   '  y, z\n'
+                   ']\n', conf)
+        self.check('---\n'
+                   'a: [\n'
+                   '  x,\n'
+                   '  y, z]\n', conf)
+        self.check('---\n'
+                   'a: [\n'
+                   '   x,\n'
+                   '  y, z\n'
+                   ']\n', conf, problem=(3, 4))
+        self.check('---\n'
+                   'a: [\n'
+                   '  x,\n'
+                   '  y, z\n'
+                   '  ]\n', conf, problem=(5, 3))
+
+    def test_under_indented(self):
+        conf = 'indentation: {spaces: 2, indent-sequences: yes}'
         self.check('---\n'
                    'object:\n'
                    ' val: 1\n'
@@ -88,7 +256,13 @@ class IndentationTestCase(RuleTestCase):
                    '  k1:\n'
                    '   - a\n'
                    '...\n', conf, problem=(4, 4))
-        conf = 'indentation: {spaces: 4}'
+        self.check('---\n'
+                   'object:\n'
+                   '  k3:\n'
+                   '    - name: Unix\n'
+                   '     date: 1969\n'
+                   '...\n', conf, problem=(5, 6, 'syntax'))
+        conf = 'indentation: {spaces: 4, indent-sequences: yes}'
         self.check('---\n'
                    'object:\n'
                    '   val: 1\n'
@@ -98,9 +272,15 @@ class IndentationTestCase(RuleTestCase):
                    '- el2:\n'
                    '   - subel\n'
                    '...\n', conf, problem=(4, 4))
+        self.check('---\n'
+                   'object:\n'
+                   '    k3:\n'
+                   '        - name: Linux\n'
+                   '         date: 1991\n'
+                   '...\n', conf, problem=(5, 10, 'syntax'))
 
     def test_over_indented(self):
-        conf = 'indentation: {spaces: 2}'
+        conf = 'indentation: {spaces: 2, indent-sequences: yes}'
         self.check('---\n'
                    'object:\n'
                    '   val: 1\n'
@@ -110,7 +290,13 @@ class IndentationTestCase(RuleTestCase):
                    '  k1:\n'
                    '     - a\n'
                    '...\n', conf, problem=(4, 6))
-        conf = 'indentation: {spaces: 4}'
+        self.check('---\n'
+                   'object:\n'
+                   '  k3:\n'
+                   '    - name: Unix\n'
+                   '       date: 1969\n'
+                   '...\n', conf, problem=(5, 12, 'syntax'))
+        conf = 'indentation: {spaces: 4, indent-sequences: yes}'
         self.check('---\n'
                    'object:\n'
                    '     val: 1\n'
@@ -118,7 +304,7 @@ class IndentationTestCase(RuleTestCase):
         self.check('---\n'
                    ' object:\n'
                    '     val: 1\n'
-                   '...\n', conf, problem1=(2, 2), problem2=(3, 6))
+                   '...\n', conf, problem=(2, 2))
         self.check('---\n'
                    '- el1\n'
                    '- el2:\n'
@@ -129,30 +315,57 @@ class IndentationTestCase(RuleTestCase):
                    '- el2:\n'
                    '              - subel\n'
                    '...\n', conf, problem=(4, 15))
+        self.check('---\n'
+                   '  - el1\n'
+                   '  - el2:\n'
+                   '        - subel\n'
+                   '...\n', conf,
+                   problem=(2, 3))
+        self.check('---\n'
+                   'object:\n'
+                   '    k3:\n'
+                   '        - name: Linux\n'
+                   '           date: 1991\n'
+                   '...\n', conf, problem=(5, 16, 'syntax'))
+        conf = 'indentation: {spaces: 4, indent-sequences: whatever}'
         self.check('---\n'
                    '  - el1\n'
                    '  - el2:\n'
                    '    - subel\n'
                    '...\n', conf,
-                   problem1=(2, 3), problem2=(3, 3), problem3=(4, 5))
+                   problem=(2, 3))
 
     def test_multi_lines(self):
+        conf = 'indentation: {spaces: 2, indent-sequences: yes}'
         self.check('---\n'
                    'long_string: >\n'
                    '  bla bla blah\n'
                    '  blah bla bla\n'
-                   '...\n', None)
+                   '...\n', conf)
         self.check('---\n'
                    '- long_string: >\n'
                    '    bla bla blah\n'
                    '    blah bla bla\n'
-                   '...\n', None)
+                   '...\n', conf)
         self.check('---\n'
                    'obj:\n'
                    '  - long_string: >\n'
                    '      bla bla blah\n'
                    '      blah bla bla\n'
-                   '...\n', None)
+                   '...\n', conf)
+
+    def test_empty_value(self):
+        conf = 'indentation: {spaces: 2}'
+        self.check('---\n'
+                   'key1:\n'
+                   'key2: not empty\n'
+                   'key3:\n'
+                   '...\n', conf)
+        self.check('---\n'
+                   '-\n'
+                   '- item 2\n'
+                   '-\n'
+                   '...\n', conf)
 
     def test_nested_collections(self):
         conf = 'indentation: {spaces: 2}'
@@ -163,7 +376,7 @@ class IndentationTestCase(RuleTestCase):
         self.check('---\n'
                    '- o:\n'
                    ' k1: v1\n'
-                   '...\n', conf, problem=(3, 2))
+                   '...\n', conf, problem=(3, 2, 'syntax'))
         self.check('---\n'
                    '- o:\n'
                    '   k1: v1\n'
@@ -171,18 +384,33 @@ class IndentationTestCase(RuleTestCase):
         conf = 'indentation: {spaces: 4}'
         self.check('---\n'
                    '- o:\n'
-                   '    k1: v1\n'
+                   '      k1: v1\n'
                    '...\n', conf)
-        self.check('---\n'
-                   '- o:\n'
-                   '   k1: v1\n'
-                   '...\n', conf, problem=(3, 4))
         self.check('---\n'
                    '- o:\n'
                    '     k1: v1\n'
                    '...\n', conf, problem=(3, 6))
+        self.check('---\n'
+                   '- o:\n'
+                   '       k1: v1\n'
+                   '...\n', conf, problem=(3, 8))
+        self.check('---\n'
+                   '- - - - item\n'
+                   '    - elem 1\n'
+                   '    - elem 2\n'
+                   '    - - - - - very nested: a\n'
+                   '              key: value\n'
+                   '...\n', conf)
+        self.check('---\n'
+                   ' - - - - item\n'
+                   '     - elem 1\n'
+                   '     - elem 2\n'
+                   '     - - - - - very nested: a\n'
+                   '               key: value\n'
+                   '...\n', conf, problem=(2, 2))
 
     def test_return(self):
+        conf = 'indentation: {spaces: 2}'
         self.check('---\n'
                    'a:\n'
                    '  b:\n'
@@ -191,19 +419,19 @@ class IndentationTestCase(RuleTestCase):
                    '    e:\n'
                    '      f:\n'
                    'g:\n'
-                   '...\n', None)
-        # self.check('---\n'
-        #            'a:\n'
-        #            '  b:\n'
-        #            '    c:\n'
-        #            '   d:\n'
-        #            '...\n', None, problem=(5, 5))
-        # self.check('---\n'
-        #            'a:\n'
-        #            '  b:\n'
-        #            '    c:\n'
-        #            ' d:\n'
-        #            '...\n', None, problem=(5, 2))
+                   '...\n', conf)
+        self.check('---\n'
+                   'a:\n'
+                   '  b:\n'
+                   '    c:\n'
+                   '   d:\n'
+                   '...\n', conf, problem=(5, 4, 'syntax'))
+        self.check('---\n'
+                   'a:\n'
+                   '  b:\n'
+                   '    c:\n'
+                   ' d:\n'
+                   '...\n', conf, problem=(5, 2, 'syntax'))
 
     def test_first_line(self):
         conf = ('indentation: {spaces: 2}\n'
@@ -224,3 +452,418 @@ class IndentationTestCase(RuleTestCase):
                    '   2,\n'
                    ' 3\n'
                    ']\n', conf, problem1=(4, 4), problem2=(5, 2))
+
+    def test_explicit_block_mappings(self):
+        conf = 'indentation: {spaces: 4}'
+        self.check('---\n'
+                   'object:\n'
+                   '    ? key\n'
+                   '    :\n'
+                   '        value\n'
+                   '...\n', conf)
+        self.check('---\n'
+                   'object:\n'
+                   '    ? key\n'
+                   '    :\n'
+                   '       value\n'
+                   '...\n', conf, problem=(5, 8))
+        self.check('---\n'
+                   'object:\n'
+                   '    ?\n'
+                   '        key\n'
+                   '    :\n'
+                   '        value\n'
+                   '...\n', conf)
+        self.check('---\n'
+                   'object:\n'
+                   '    ?\n'
+                   '       key\n'
+                   '    :\n'
+                   '         value\n'
+                   '...\n', conf, problem1=(4, 8), problem2=(6, 10))
+        self.check('---\n'
+                   'object:\n'
+                   '    ?\n'
+                   '         key\n'
+                   '    :\n'
+                   '       value\n'
+                   '...\n', conf, problem1=(4, 10), problem2=(6, 8))
+
+
+class ScalarIndentationTestCase(RuleTestCase):
+    rule_id = 'indentation'
+
+    def test_basics_plain(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: no}\n'
+                'document-start: disable\n')
+        self.check('multi\n'
+                   'line\n', conf)
+        self.check('multi\n'
+                   ' line\n', conf)
+        self.check('- multi\n'
+                   '  line\n', conf)
+        self.check('- multi\n'
+                   '   line\n', conf)
+        self.check('a key: multi\n'
+                   '       line\n', conf)
+        self.check('a key: multi\n'
+                   '  line\n', conf, problem=(2, 3))
+        self.check('a key: multi\n'
+                   '        line\n', conf)
+        self.check('a key:\n'
+                   '  multi\n'
+                   '  line\n', conf)
+        self.check('- C code: void main() {\n'
+                   '              printf("foo");\n'
+                   '          }\n', conf)
+        self.check('- C code:\n'
+                   '    void main() {\n'
+                   '        printf("foo");\n'
+                   '    }\n', conf)
+
+    def test_check_multi_line_plain(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: yes}\n'
+                'document-start: disable\n')
+        self.check('multi\n'
+                   ' line\n', conf, problem=(2, 2))
+        self.check('- multi\n'
+                   '   line\n', conf, problem=(2, 4))
+        self.check('a key: multi\n'
+                   '        line\n', conf, problem=(2, 9))
+        self.check('a key:\n'
+                   '  multi\n'
+                   '   line\n', conf, problem=(3, 4))
+        self.check('- C code: void main() {\n'
+                   '              printf("foo");\n'
+                   '          }\n', conf, problem=(2, 15))
+        self.check('- C code:\n'
+                   '    void main() {\n'
+                   '        printf("foo");\n'
+                   '    }\n', conf, problem=(3, 9))
+
+    def test_basics_quoted(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: no}\n'
+                'document-start: disable\n')
+        self.check('"multi\n'
+                   ' line"\n', conf)
+        self.check('"multi\n'
+                   'line"\n', conf, problem=(2, 1))
+        self.check('- "multi\n'
+                   '   line"\n', conf)
+        self.check('- "multi\n'
+                   '  line"\n', conf, problem=(2, 3))
+        self.check('a key: "multi\n'
+                   '        line"\n', conf)
+        self.check('a key: "multi\n'
+                   '  line"\n', conf, problem=(2, 3))
+        self.check('a key: "multi\n'
+                   '       line"\n', conf, problem=(2, 8))
+        self.check('a key:\n'
+                   '  "multi\n'
+                   '   line"\n', conf)
+        self.check('a key:\n'
+                   '  "multi\n'
+                   '  line"\n', conf, problem=(3, 3))
+        self.check('- jinja2: "{% if ansible is defined %}\n'
+                   '             {{ ansible }}\n'
+                   '           {% else %}\n'
+                   '             {{ chef }}\n'
+                   '           {% endif %}"\n', conf)
+        self.check('- jinja2:\n'
+                   '    "{% if ansible is defined %}\n'
+                   '       {{ ansible }}\n'
+                   '     {% else %}\n'
+                   '       {{ chef }}\n'
+                   '     {% endif %}"\n', conf)
+
+    def test_check_multi_line_quoted(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: yes}\n'
+                'document-start: disable\n')
+        self.check('"multi\n'
+                   '  line"\n', conf, problem=(2, 3))
+        self.check('- "multi\n'
+                   '    line"\n', conf, problem=(2, 5))
+        self.check('a key: "multi\n'
+                   '         line"\n', conf, problem=(2, 10))
+        self.check('a key:\n'
+                   '  "multi\n'
+                   '    line"\n', conf, problem=(3, 5))
+        self.check('- jinja2: "{% if ansible is defined %}\n'
+                   '             {{ ansible }}\n'
+                   '           {% else %}\n'
+                   '             {{ chef }}\n'
+                   '           {% endif %}"\n', conf,
+                   problem1=(2, 14), problem2=(4, 14))
+        self.check('- jinja2:\n'
+                   '    "{% if ansible is defined %}\n'
+                   '       {{ ansible }}\n'
+                   '     {% else %}\n'
+                   '       {{ chef }}\n'
+                   '     {% endif %}"\n', conf,
+                   problem1=(3, 8), problem2=(5, 8))
+
+    def test_basics_folded_style(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: no}\n'
+                'document-start: disable\n')
+        self.check('>\n'
+                   '  multi\n'
+                   '  line\n', conf)
+        self.check('- >\n'
+                   '    multi\n'
+                   '    line\n', conf)
+        self.check('- key: >\n'
+                   '    multi\n'
+                   '    line\n', conf)
+        self.check('- key:\n'
+                   '    >\n'
+                   '      multi\n'
+                   '      line\n', conf)
+        self.check('- ? >\n'
+                   '      multi-line\n'
+                   '      key\n'
+                   '  : >\n'
+                   '      multi-line\n'
+                   '      value\n', conf)
+        self.check('- ?\n'
+                   '    >\n'
+                   '      multi-line\n'
+                   '      key\n'
+                   '  :\n'
+                   '    >\n'
+                   '      multi-line\n'
+                   '      value\n', conf)
+        self.check('- jinja2: >\n'
+                   '    {% if ansible is defined %}\n'
+                   '      {{ ansible }}\n'
+                   '    {% else %}\n'
+                   '      {{ chef }}\n'
+                   '    {% endif %}\n', conf)
+
+    def test_check_multi_line_folded_style(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: yes}\n'
+                'document-start: disable\n')
+        self.check('>\n'
+                   '  multi\n'
+                   '   line\n', conf, problem=(3, 4))
+        self.check('- >\n'
+                   '    multi\n'
+                   '     line\n', conf, problem=(3, 6))
+        self.check('- key: >\n'
+                   '    multi\n'
+                   '     line\n', conf, problem=(3, 6))
+        self.check('- key:\n'
+                   '    >\n'
+                   '      multi\n'
+                   '       line\n', conf, problem=(4, 8))
+        self.check('- ? >\n'
+                   '      multi-line\n'
+                   '       key\n'
+                   '  : >\n'
+                   '      multi-line\n'
+                   '       value\n', conf,
+                   problem1=(3, 8), problem2=(6, 8))
+        self.check('- ?\n'
+                   '    >\n'
+                   '      multi-line\n'
+                   '       key\n'
+                   '  :\n'
+                   '    >\n'
+                   '      multi-line\n'
+                   '       value\n', conf,
+                   problem1=(4, 8), problem2=(8, 8))
+        self.check('- jinja2: >\n'
+                   '    {% if ansible is defined %}\n'
+                   '      {{ ansible }}\n'
+                   '    {% else %}\n'
+                   '      {{ chef }}\n'
+                   '    {% endif %}\n', conf,
+                   problem1=(3, 7), problem2=(5, 7))
+
+    def test_basics_literal_style(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: no}\n'
+                'document-start: disable\n')
+        self.check('|\n'
+                   '  multi\n'
+                   '  line\n', conf)
+        self.check('- |\n'
+                   '    multi\n'
+                   '    line\n', conf)
+        self.check('- key: |\n'
+                   '    multi\n'
+                   '    line\n', conf)
+        self.check('- key:\n'
+                   '    |\n'
+                   '      multi\n'
+                   '      line\n', conf)
+        self.check('- ? |\n'
+                   '      multi-line\n'
+                   '      key\n'
+                   '  : |\n'
+                   '      multi-line\n'
+                   '      value\n', conf)
+        self.check('- ?\n'
+                   '    |\n'
+                   '      multi-line\n'
+                   '      key\n'
+                   '  :\n'
+                   '    |\n'
+                   '      multi-line\n'
+                   '      value\n', conf)
+        self.check('- jinja2: |\n'
+                   '    {% if ansible is defined %}\n'
+                   '     {{ ansible }}\n'
+                   '    {% else %}\n'
+                   '      {{ chef }}\n'
+                   '    {% endif %}\n', conf)
+
+    def test_check_multi_line_literal_style(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: yes}\n'
+                'document-start: disable\n')
+        self.check('|\n'
+                   '  multi\n'
+                   '   line\n', conf, problem=(3, 4))
+        self.check('- |\n'
+                   '    multi\n'
+                   '     line\n', conf, problem=(3, 6))
+        self.check('- key: |\n'
+                   '    multi\n'
+                   '     line\n', conf, problem=(3, 6))
+        self.check('- key:\n'
+                   '    |\n'
+                   '      multi\n'
+                   '       line\n', conf, problem=(4, 8))
+        self.check('- ? |\n'
+                   '      multi-line\n'
+                   '       key\n'
+                   '  : |\n'
+                   '      multi-line\n'
+                   '       value\n', conf,
+                   problem1=(3, 8), problem2=(6, 8))
+        self.check('- ?\n'
+                   '    |\n'
+                   '      multi-line\n'
+                   '       key\n'
+                   '  :\n'
+                   '    |\n'
+                   '      multi-line\n'
+                   '       value\n', conf,
+                   problem1=(4, 8), problem2=(8, 8))
+        self.check('- jinja2: |\n'
+                   '    {% if ansible is defined %}\n'
+                   '      {{ ansible }}\n'
+                   '    {% else %}\n'
+                   '      {{ chef }}\n'
+                   '    {% endif %}\n', conf,
+                   problem1=(3, 7), problem2=(5, 7))
+
+    # The following "paragraph" examples are inspired from
+    # http://stackoverflow.com/questions/3790454/in-yaml-how-do-i-break-a-string-over-multiple-lines
+
+    def test_paragraph_plain(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: yes}\n'
+                'document-start: disable\n')
+        self.check('- long text: very "long"\n'
+                   '             \'string\' with\n'
+                   '\n'
+                   '             paragraph gap, \\n and\n'
+                   '             spaces.\n', conf)
+        self.check('- long text: very "long"\n'
+                   '    \'string\' with\n'
+                   '\n'
+                   '    paragraph gap, \\n and\n'
+                   '    spaces.\n', conf,
+                   problem1=(2, 5), problem2=(4, 5), problem3=(5, 5))
+        self.check('- long text:\n'
+                   '    very "long"\n'
+                   '    \'string\' with\n'
+                   '\n'
+                   '    paragraph gap, \\n and\n'
+                   '    spaces.\n', conf)
+
+    def test_paragraph_double_quoted(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: yes}\n'
+                'document-start: disable\n')
+        self.check('- long text: "very \\"long\\"\n'
+                   '              \'string\' with\n'
+                   '\n'
+                   '              paragraph gap, \\n and\n'
+                   '              spaces."\n', conf)
+        self.check('- long text: "very \\"long\\"\n'
+                   '    \'string\' with\n'
+                   '\n'
+                   '    paragraph gap, \\n and\n'
+                   '    spaces."\n', conf,
+                   problem1=(2, 5), problem2=(4, 5), problem3=(5, 5))
+        self.check('- long text: "very \\"long\\"\n'
+                   '\'string\' with\n'
+                   '\n'
+                   'paragraph gap, \\n and\n'
+                   'spaces."\n', conf,
+                   problem1=(2, 1), problem2=(4, 1), problem3=(5, 1))
+        self.check('- long text:\n'
+                   '    "very \\"long\\"\n'
+                   '     \'string\' with\n'
+                   '\n'
+                   '     paragraph gap, \\n and\n'
+                   '     spaces."\n', conf)
+
+    def test_paragraph_single_quoted(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: yes}\n'
+                'document-start: disable\n')
+        self.check('- long text: \'very "long"\n'
+                   '              \'\'string\'\' with\n'
+                   '\n'
+                   '              paragraph gap, \\n and\n'
+                   '              spaces.\'\n', conf)
+        self.check('- long text: \'very "long"\n'
+                   '    \'\'string\'\' with\n'
+                   '\n'
+                   '    paragraph gap, \\n and\n'
+                   '    spaces.\'\n', conf,
+                   problem1=(2, 5), problem2=(4, 5), problem3=(5, 5))
+        self.check('- long text: \'very "long"\n'
+                   '\'\'string\'\' with\n'
+                   '\n'
+                   'paragraph gap, \\n and\n'
+                   'spaces.\'\n', conf,
+                   problem1=(2, 1), problem2=(4, 1), problem3=(5, 1))
+        self.check('- long text:\n'
+                   '    \'very "long"\n'
+                   '     \'\'string\'\' with\n'
+                   '\n'
+                   '     paragraph gap, \\n and\n'
+                   '     spaces.\'\n', conf)
+
+    def test_paragraph_folded(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: yes}\n'
+                'document-start: disable\n')
+        self.check('- long text: >\n'
+                   '    very "long"\n'
+                   '    \'string\' with\n'
+                   '\n'
+                   '    paragraph gap, \\n and\n'
+                   '    spaces.\n', conf)
+        self.check('- long text: >\n'
+                   '    very "long"\n'
+                   '     \'string\' with\n'
+                   '\n'
+                   '      paragraph gap, \\n and\n'
+                   '       spaces.\n', conf,
+                   problem1=(3, 6), problem2=(5, 7), problem3=(6, 8))
+
+    def test_paragraph_literal(self):
+        conf = ('indentation: {spaces: 2, check-multi-line-strings: yes}\n'
+                'document-start: disable\n')
+        self.check('- long text: |\n'
+                   '    very "long"\n'
+                   '    \'string\' with\n'
+                   '\n'
+                   '    paragraph gap, \\n and\n'
+                   '    spaces.\n', conf)
+        self.check('- long text: |\n'
+                   '    very "long"\n'
+                   '     \'string\' with\n'
+                   '\n'
+                   '      paragraph gap, \\n and\n'
+                   '       spaces.\n', conf,
+                   problem1=(3, 6), problem2=(5, 7), problem3=(6, 8))

tests/rules/test_syntax_error.py

@@ -35,3 +35,35 @@ class YamlLintTestCase(RuleTestCase):
                    '%TAG ! tag:clarkevans.com,2002:\n'
                    'doc: ument\n'
                    '...\n', None, problem=(3, 1))
+
+    def test_explicit_mapping(self):
+        self.check('---\n'
+                   '? key\n'
+                   ': - value 1\n'
+                   '  - value 2\n'
+                   '...\n', None)
+        self.check('---\n'
+                   '?\n'
+                   '  key\n'
+                   ': {a: 1}\n'
+                   '...\n', None)
+        self.check('---\n'
+                   '?\n'
+                   '  key\n'
+                   ':\n'
+                   '  val\n'
+                   '...\n', None)
+
+    def test_mapping_between_sequences(self):
+        # This is valid YAML. See http://www.yaml.org/spec/1.2/spec.html,
+        # example 2.11
+        self.check('---\n'
+                   '? - Detroit Tigers\n'
+                   '  - Chicago cubs\n'
+                   ':\n'
+                   '  - 2001-07-23\n'
+                   '\n'
+                   '? [New York Yankees,\n'
+                   '   Atlanta Braves]\n'
+                   ': [2001-07-02, 2001-08-12,\n'
+                   '   2001-08-14]\n', None)

tests/rules/test_trailing_spaces.py

@@ -33,11 +33,11 @@ class TrailingSpacesTestCase(RuleTestCase):
         self.check('', conf)
         self.check('\n', conf)
         self.check('    \n', conf, problem=(1, 1))
-        self.check('\t\t\t\n', conf, problem=(1, 1))
+        self.check('\t\t\t\n', conf, problem=(1, 1, 'syntax'))
         self.check('---\n'
                    'some: text \n', conf, problem=(2, 11))
         self.check('---\n'
-                   'some: text\t\n', conf, problem=(2, 11))
+                   'some: text\t\n', conf, problem=(2, 11, 'syntax'))
 
     def test_with_dos_new_lines(self):
         conf = ('trailing-spaces: {}\n'

tests/test_config.py

@@ -0,0 +1,69 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2016 Adrien Vergé
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import unittest
+
+from yamllint import config
+
+
+class ConfigTestCase(unittest.TestCase):
+    def setUp(self):
+        self.base = config.parse_config_from_file(os.path.join(
+            os.path.dirname(os.path.dirname(os.path.realpath(__file__))),
+            'yamllint', 'conf', 'default.yml'))
+
+    def test_extend_config_disable_rule(self):
+        new = config.parse_config('extends: default\n'
+                                  'rules:\n'
+                                  '  trailing-spaces: disable\n')
+
+        base = self.base.copy()
+        del base['trailing-spaces']
+
+        self.assertEqual(sorted(new.keys()), sorted(base.keys()))
+        for rule in new:
+            self.assertEqual(new[rule], base[rule])
+
+    def test_extend_config_override_whole_rule(self):
+        new = config.parse_config('extends: default\n'
+                                  'rules:\n'
+                                  '  empty-lines:\n'
+                                  '    max: 42\n'
+                                  '    max-start: 43\n'
+                                  '    max-end: 44\n')
+
+        base = self.base.copy()
+        base['empty-lines']['max'] = 42
+        base['empty-lines']['max-start'] = 43
+        base['empty-lines']['max-end'] = 44
+
+        self.assertEqual(sorted(new.keys()), sorted(base.keys()))
+        for rule in new:
+            self.assertEqual(new[rule], base[rule])
+
+    def test_extend_config_override_rule_partly(self):
+        new = config.parse_config('extends: default\n'
+                                  'rules:\n'
+                                  '  empty-lines:\n'
+                                  '    max-start: 42\n')
+
+        base = self.base.copy()
+        base['empty-lines']['max-start'] = 42
+
+        self.assertEqual(sorted(new.keys()), sorted(base.keys()))
+        for rule in new:
+            self.assertEqual(new[rule], base[rule])

yamllint/__init__.py

@@ -22,11 +22,11 @@ from yamllint import parser
 
 
 APP_NAME = 'yamllint'
-APP_VERSION = '0.2.0'
+APP_VERSION = '0.5.1'
 APP_DESCRIPTION = 'A linter for YAML files.'
 
-__author__ = 'Adrien Vergé'
-__copyright__ = 'Copyright 2016, Adrien Vergé'
+__author__ = u'Adrien Vergé'
+__copyright__ = u'Copyright 2016, Adrien Vergé'
 __license__ = 'GPLv3'
 __version__ = APP_VERSION
 
@@ -38,12 +38,17 @@ def get_costemic_problems(buffer, conf):
     token_rules = [r for r in rules if r.TYPE == 'token']
     line_rules = [r for r in rules if r.TYPE == 'line']
 
+    context = {}
+    for rule in token_rules:
+        context[rule.ID] = {}
+
     for elem in parser.token_or_line_generator(buffer):
         if isinstance(elem, parser.Token):
             for rule in token_rules:
                 rule_conf = conf[rule.ID]
                 for problem in rule.check(rule_conf,
-                                          elem.curr, elem.prev, elem.next):
+                                          elem.curr, elem.prev, elem.next,
+                                          context[rule.ID]):
                     problem.rule = rule.ID
                     problem.level = rule_conf['level']
                     yield problem
@@ -58,7 +63,7 @@ def get_costemic_problems(buffer, conf):
 
 def get_syntax_error(buffer):
     try:
-        list(yaml.safe_load_all(buffer))
+        list(yaml.parse(buffer, Loader=yaml.BaseLoader))
     except yaml.error.MarkedYAMLError as e:
         problem = LintProblem(e.problem_mark.line + 1,
                               e.problem_mark.column + 1,
@@ -76,11 +81,16 @@ def _lint(buffer, conf):
         # Insert the syntax error (if any) at the right place...
         if (syntax_error and syntax_error.line <= problem.line and
                 syntax_error.column <= problem.column):
-            # ... unless there is already a yamllint error, in which case the
-            # syntax error is probably redundant.
-            if (syntax_error.line != problem.line or
-                    syntax_error.column != problem.column):
-                yield syntax_error
+            yield syntax_error
+
+            # If there is already a yamllint error at the same place, discard
+            # it as it is probably redundant (and maybe it's just a 'warning',
+            # in which case the script won't even exit with a failure status).
+            if (syntax_error.line == problem.line and
+                    syntax_error.column == problem.column):
+                syntax_error = None
+                continue
+
             syntax_error = None
 
         yield problem

yamllint/cli.py

@@ -0,0 +1,119 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# Copyright (C) 2016 Adrien Vergé
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function
+import os.path
+import sys
+
+import argparse
+
+from yamllint import APP_DESCRIPTION, APP_NAME, APP_VERSION
+from yamllint import config
+from yamllint.errors import YamlLintConfigError
+from yamllint import lint
+
+
+def find_files_recursively(items):
+    for item in items:
+        if os.path.isdir(item):
+            for root, dirnames, filenames in os.walk(item):
+                for filename in [f for f in filenames
+                                 if f.endswith(('.yml', '.yaml'))]:
+                    yield os.path.join(root, filename)
+        else:
+            yield item
+
+
+class Format(object):
+    @staticmethod
+    def parsable(problem, filename):
+        return ('%(file)s:%(line)s:%(column)s: [%(level)s] %(message)s' %
+                {'file': filename,
+                 'line': problem.line,
+                 'column': problem.column,
+                 'level': problem.level,
+                 'message': problem.message})
+
+    @staticmethod
+    def standard(problem, filename):
+        line = '  \033[2m%d:%d\033[0m' % (problem.line, problem.column)
+        line += max(20 - len(line), 0) * ' '
+        if problem.level == 'warning':
+            line += '\033[33m%s\033[0m' % problem.level
+        else:
+            line += '\033[31m%s\033[0m' % problem.level
+        line += max(38 - len(line), 0) * ' '
+        line += problem.desc
+        if problem.rule:
+            line += '  \033[2m(%s)\033[0m' % problem.rule
+        return line
+
+
+def run(argv):
+    parser = argparse.ArgumentParser(prog=APP_NAME,
+                                     description=APP_DESCRIPTION)
+    parser.add_argument('files', metavar='FILE_OR_DIR', nargs='+',
+                        help='files to check')
+    parser.add_argument('-c', '--config', dest='config_file', action='store',
+                        help='path to a custom configuration')
+    parser.add_argument('-f', '--format',
+                        choices=('parsable', 'standard'), default='standard',
+                        help='format for parsing output')
+    parser.add_argument('-v', '--version', action='version',
+                        version='%s %s' % (APP_NAME, APP_VERSION))
+
+    # TODO: read from stdin when no filename?
+
+    args = parser.parse_args(argv)
+
+    try:
+        if args.config_file is not None:
+            conf = config.parse_config_from_file(args.config_file)
+        elif os.path.isfile('.yamllint'):
+            conf = config.parse_config_from_file('.yamllint')
+        else:
+            conf = config.parse_config('extends: default')
+    except YamlLintConfigError as e:
+        print(e, file=sys.stderr)
+        sys.exit(-1)
+
+    return_code = 0
+
+    for file in find_files_recursively(args.files):
+        try:
+            first = True
+            with open(file) as f:
+                for problem in lint(f, conf):
+                    if args.format == 'parsable':
+                        print(Format.parsable(problem, file))
+                    else:
+                        if first:
+                            print('\033[4m%s\033[0m' % file)
+                            first = False
+
+                        print(Format.standard(problem, file))
+
+                    if return_code == 0 and problem.level == 'error':
+                        return_code = 1
+
+            if not first and args.format != 'parsable':
+                print('')
+        except EnvironmentError as e:
+            print(e)
+            return_code = -1
+
+    sys.exit(return_code)

yamllint/conf/default.yml

@@ -31,12 +31,11 @@ rules:
     max-spaces-after: 1
   indentation:
     spaces: 2
+    indent-sequences: yes
+    check-multi-line-strings: no
   line-length:
     max: 80
   new-line-at-end-of-file: {level: error}
   new-lines:
     type: unix
-  #sequences-indentation:
-  #  level: warning
-  #  present: yes
   trailing-spaces: {}

yamllint/config.py

@@ -46,7 +46,11 @@ def extend_config(content):
         if 'extends' in conf:
             base = parse_config_from_file(get_extended_conf(conf['extends']))
 
-            base.update(conf['rules'])
+            for rule in conf['rules']:
+                if type(conf['rules'][rule]) == dict and rule in base:
+                    base[rule].update(conf['rules'][rule])
+                else:
+                    base[rule] = conf['rules'][rule]
             conf['rules'] = base
 
         return conf
@@ -83,10 +87,16 @@ def parse_config(content):
                     raise YamlLintConfigError(
                         'invalid config: unknown option "%s" for rule "%s"' %
                         (optkey, id))
-                if type(conf['rules'][id][optkey]) != options[optkey]:
-                    raise YamlLintConfigError(
-                        'invalid config: option "%s" of "%s" should be %s' %
-                        (optkey, id, options[optkey].__name__))
+                if type(options[optkey]) == tuple:
+                    if conf['rules'][id][optkey] not in options[optkey]:
+                        raise YamlLintConfigError(
+                            ('invalid config: option "%s" of "%s" should be '
+                             'in %s') % (optkey, id, options[optkey]))
+                else:
+                    if type(conf['rules'][id][optkey]) != options[optkey]:
+                        raise YamlLintConfigError(
+                            ('invalid config: option "%s" of "%s" should be '
+                             '%s' % (optkey, id, options[optkey].__name__)))
                 rules[id][optkey] = conf['rules'][id][optkey]
         else:
             raise YamlLintConfigError(('invalid config: rule "%s": should be '

yamllint/errors.py

@@ -16,10 +16,15 @@
 
 
 class LintProblem(object):
+    """Represents a linting problem found by yamllint."""
     def __init__(self, line, column, desc='<no description>', rule=None):
+        #: Line on which the problem was found (starting at 1)
         self.line = line
+        #: Column on which the problem was found (starting at 1)
         self.column = column
+        #: Human-readable description of the problem
         self.desc = desc
+        #: Identifier of the rule that detected the problem
         self.rule = rule
         self.level = None
 

yamllint/output.py

@@ -1,38 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright (C) 2016 Adrien Vergé
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-
-def parsable_format(problem, filename):
-    return ('%(file)s:%(line)s:%(column)s: [%(level)s] %(message)s' %
-            {'file': filename,
-             'line': problem.line,
-             'column': problem.column,
-             'level': problem.level,
-             'message': problem.message})
-
-
-def standard_format(problem, filename):
-    line = '  \033[2m%d:%d\033[0m' % (problem.line, problem.column)
-    line += max(20 - len(line), 0) * ' '
-    if problem.level == 'warning':
-        line += '\033[33m%s\033[0m' % problem.level
-    else:
-        line += '\033[31m%s\033[0m' % problem.level
-    line += max(38 - len(line), 0) * ' '
-    line += problem.desc
-    if problem.rule:
-        line += '  \033[2m(%s)\033[0m' % problem.rule
-    return line

yamllint/rules/braces.py

@@ -14,6 +14,54 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to control the number of spaces inside braces (``{`` and ``}``).
+
+.. rubric:: Options
+
+* ``min-spaces-inside`` defines the minimal number of spaces required inside
+  braces.
+* ``max-spaces-inside`` defines the maximal number of spaces allowed inside
+  braces.
+
+.. rubric:: Examples
+
+#. With ``braces: {min-spaces-inside: 0, max-spaces-inside: 0}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: {key1: 4, key2: 8}
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: { key1: 4, key2: 8 }
+
+#. With ``braces: {min-spaces-inside: 1, max-spaces-inside: 3}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: { key1: 4, key2: 8 }
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: { key1: 4, key2: 8   }
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: {    key1: 4, key2: 8   }
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: {key1: 4, key2: 8 }
+"""
+
+
 import yaml
 
 from yamllint.rules.common import spaces_after, spaces_before
@@ -25,7 +73,7 @@ CONF = {'min-spaces-inside': int,
         'max-spaces-inside': int}
 
 
-def check(conf, token, prev, next):
+def check(conf, token, prev, next, context):
     if isinstance(token, yaml.FlowMappingStartToken):
         problem = spaces_after(token, prev, next,
                                min=conf['min-spaces-inside'],

yamllint/rules/brackets.py

@@ -14,6 +14,55 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to control the number of spaces inside brackets (``[`` and
+``]``).
+
+.. rubric:: Options
+
+* ``min-spaces-inside`` defines the minimal number of spaces required inside
+  brackets.
+* ``max-spaces-inside`` defines the maximal number of spaces allowed inside
+  brackets.
+
+.. rubric:: Examples
+
+#. With ``brackets: {min-spaces-inside: 0, max-spaces-inside: 0}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: [1, 2, abc]
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: [ 1, 2, abc ]
+
+#. With ``brackets: {min-spaces-inside: 1, max-spaces-inside: 3}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: [ 1, 2, abc ]
+
+   the following code snippet would **PASS**:
+   ::
+
+    object: [ 1, 2, abc   ]
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: [    1, 2, abc   ]
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object: [1, 2, abc ]
+"""
+
+
 import yaml
 
 from yamllint.rules.common import spaces_after, spaces_before
@@ -25,7 +74,7 @@ CONF = {'min-spaces-inside': int,
         'max-spaces-inside': int}
 
 
-def check(conf, token, prev, next):
+def check(conf, token, prev, next, context):
     if isinstance(token, yaml.FlowSequenceStartToken):
         problem = spaces_after(token, prev, next,
                                min=conf['min-spaces-inside'],

yamllint/rules/colons.py

@@ -14,9 +14,65 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to control the number of spaces before and after colons (``:``).
+
+.. rubric:: Options
+
+* ``max-spaces-before`` defines the maximal number of spaces allowed before
+  colons (use ``-1`` to disable).
+* ``max-spaces-after`` defines the maximal number of spaces allowed after
+  colons (use ``-1`` to disable).
+
+.. rubric:: Examples
+
+#. With ``colons: {max-spaces-before: 0, max-spaces-after: 1}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object:
+      - a
+      - b
+    key: value
+
+#. With ``colons: {max-spaces-before: 1}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    object :
+      - a
+      - b
+
+   the following code snippet would **FAIL**:
+   ::
+
+    object  :
+      - a
+      - b
+
+#. With ``colons: {max-spaces-after: 2}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    first:  1
+    second: 2
+    third:  3
+
+   the following code snippet would **FAIL**:
+   ::
+
+    first: 1
+    2nd:   2
+    third: 3
+"""
+
+
 import yaml
 
-from yamllint.rules.common import spaces_after, spaces_before
+from yamllint.rules.common import spaces_after, spaces_before, is_explicit_key
 
 
 ID = 'colons'
@@ -25,7 +81,7 @@ CONF = {'max-spaces-before': int,
         'max-spaces-after': int}
 
 
-def check(conf, token, prev, next):
+def check(conf, token, prev, next, context):
     if isinstance(token, yaml.ValueToken):
         problem = spaces_before(token, prev, next,
                                 max=conf['max-spaces-before'],
@@ -38,3 +94,10 @@ def check(conf, token, prev, next):
                                max_desc='too many spaces after colon')
         if problem is not None:
             yield problem
+
+    if isinstance(token, yaml.KeyToken) and is_explicit_key(token):
+        problem = spaces_after(token, prev, next,
+                               max=conf['max-spaces-after'],
+                               max_desc='too many spaces after question mark')
+        if problem is not None:
+            yield problem

yamllint/rules/commas.py

@@ -14,8 +14,57 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to control the number of spaces before and after commas (``,``).
+
+.. rubric:: Options
+
+* ``max-spaces-before`` defines the maximal number of spaces allowed before
+  commas (use ``-1`` to disable).
+* ``max-spaces-after`` defines the maximal number of spaces allowed after
+  commas (use ``-1`` to disable).
+
+.. rubric:: Examples
+
+#. With ``commas: {max-spaces-before: 0, max-spaces-after: 1}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    strange var:
+      [10, 20, 30, {x: 1, y: 2}]
+
+   the following code snippet would **FAIL**:
+   ::
+
+    strange var:
+      [10, 20 , 30, {x: 1, y: 2}]
+
+   the following code snippet would **FAIL**:
+   ::
+
+    strange var:
+      [10, 20, 30, {x: 1,  y: 2}]
+
+#. With ``commas: {max-spaces-before: 2, max-spaces-after: 2}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    strange var:
+      [10  , 20 ,  30,  {x: 1  ,  y: 2}]
+
+   the following code snippet would **FAIL**:
+   ::
+
+    strange var:
+      [10  , 20 ,   30,  {x: 1  ,  y: 2}]
+"""
+
+
 import yaml
 
+from yamllint.errors import LintProblem
 from yamllint.rules.common import spaces_after, spaces_before
 
 
@@ -25,13 +74,18 @@ CONF = {'max-spaces-before': int,
         'max-spaces-after': int}
 
 
-def check(conf, token, prev, next):
+def check(conf, token, prev, next, context):
     if isinstance(token, yaml.FlowEntryToken):
-        problem = spaces_before(token, prev, next,
-                                max=conf['max-spaces-before'],
-                                max_desc='too many spaces before comma')
-        if problem is not None:
-            yield problem
+        if prev is not None and prev.end_mark.line < token.start_mark.line:
+            yield LintProblem(token.start_mark.line + 1,
+                              max(1, token.start_mark.column),
+                              'too many spaces before comma')
+        else:
+            problem = spaces_before(token, prev, next,
+                                    max=conf['max-spaces-before'],
+                                    max_desc='too many spaces before comma')
+            if problem is not None:
+                yield problem
 
         problem = spaces_after(token, prev, next,
                                max=conf['max-spaces-after'],

yamllint/rules/comments.py

@@ -14,6 +14,47 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to control the position and formatting of comments.
+
+.. rubric:: Options
+
+* Use ``require-starting-space`` to require a space character right after the
+  ``#``. Set to ``yes`` to enable, ``no`` to disable.
+* ``min-spaces-from-content`` is used to visually separate inline comments from
+  content. It defines the minimal required number of spaces between a comment
+  and its preceding content.
+
+.. rubric:: Examples
+
+#. With ``comments: {require-starting-space: yes}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    # This sentence
+    # is a block comment
+
+   the following code snippet would **FAIL**:
+   ::
+
+    #This sentence
+    #is a block comment
+
+#. With ``comments: {min-spaces-from-content: 2}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    x = 2 ^ 127 - 1  # Mersenne prime number
+
+   the following code snippet would **FAIL**:
+   ::
+
+    x = 2 ^ 127 - 1 # Mersenne prime number
+"""
+
+
 import yaml
 
 from yamllint.errors import LintProblem
@@ -26,15 +67,17 @@ CONF = {'require-starting-space': bool,
         'min-spaces-from-content': int}
 
 
-def check(conf, token, prev, next):
+def check(conf, token, prev, next, context):
     for comment in get_comments_between_tokens(token, next):
         if (conf['min-spaces-from-content'] != -1 and
                 not isinstance(token, yaml.StreamStartToken) and
-                comment.line == token.end_mark.line + 1 and
-                comment.pointer - token.end_mark.pointer <
-                conf['min-spaces-from-content']):
-            yield LintProblem(comment.line, comment.column,
-                              'too few spaces before comment')
+                comment.line == token.end_mark.line + 1):
+            # Sometimes token end marks are on the next line
+            if token.end_mark.buffer[token.end_mark.pointer - 1] != '\n':
+                if (comment.pointer - token.end_mark.pointer <
+                        conf['min-spaces-from-content']):
+                    yield LintProblem(comment.line, comment.column,
+                                      'too few spaces before comment')
 
         if (conf['require-starting-space'] and
                 comment.pointer + 1 < len(comment.buffer) and

yamllint/rules/comments_indentation.py

@@ -14,30 +14,112 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to force comments to be indented like content.
+
+.. rubric:: Examples
+
+#. With ``comments-indentation: {}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    # Fibonacci
+    [0, 1, 1, 2, 3, 5]
+
+   the following code snippet would **FAIL**:
+   ::
+
+      # Fibonacci
+    [0, 1, 1, 2, 3, 5]
+
+   the following code snippet would **PASS**:
+   ::
+
+    list:
+        - 2
+        - 3
+        # - 4
+        - 5
+
+   the following code snippet would **FAIL**:
+   ::
+
+    list:
+        - 2
+        - 3
+    #    - 4
+        - 5
+
+   the following code snippet would **PASS**:
+   ::
+
+    # This is the first object
+    obj1:
+      - item A
+      # - item B
+    # This is the second object
+    obj2: []
+
+   the following code snippet would **PASS**:
+   ::
+
+    # This sentence
+    # is a block comment
+
+   the following code snippet would **FAIL**:
+   ::
+
+    # This sentence
+     # is a block comment
+"""
+
+
 import yaml
 
 from yamllint.errors import LintProblem
-from yamllint.rules.common import get_comments_between_tokens
+from yamllint.rules.common import get_line_indent, get_comments_between_tokens
 
 
 ID = 'comments-indentation'
 TYPE = 'token'
 
 
-def check(conf, token, prev, next):
+# Case A:
+#
+#     prev: line:
+#       # commented line
+#       current: line
+#
+# Case B:
+#
+#       prev: line
+#       # commented line 1
+#     # commented line 2
+#     current: line
+
+def check(conf, token, prev, next, context):
     if prev is None:
         return
 
-    token_indent = token.start_mark.column
+    curr_line_indent = token.start_mark.column
     if isinstance(token, yaml.StreamEndToken):
-        token_indent = 0
+        curr_line_indent = 0
 
-    skip_first = True
+    skip_first_line = True
     if isinstance(prev, yaml.StreamStartToken):
-        skip_first = False
+        skip_first_line = False
+        prev_line_indent = 0
+    else:
+        prev_line_indent = get_line_indent(prev)
 
-    for comment in get_comments_between_tokens(prev, token,
-                                               skip_first_line=skip_first):
-        if comment.column != token_indent + 1:
+    if prev_line_indent <= curr_line_indent:
+        prev_line_indent = -1  # disable it
+
+    for comment in get_comments_between_tokens(
+            prev, token, skip_first_line=skip_first_line):
+        if comment.column - 1 == curr_line_indent:
+            prev_line_indent = -1  # disable it
+        elif comment.column - 1 != prev_line_indent:
             yield LintProblem(comment.line, comment.column,
-                              'comment not intended like content')
+                              'comment not indented like content')

yamllint/rules/common.py

@@ -33,7 +33,10 @@ def spaces_after(token, prev, next, min=-1, max=-1,
 
 def spaces_before(token, prev, next, min=-1, max=-1,
                   min_desc=None, max_desc=None):
-    if prev is not None and prev.end_mark.line == token.start_mark.line:
+    if (prev is not None and prev.end_mark.line == token.start_mark.line and
+            # Discard tokens (only scalars?) that end at the start of next line
+            (prev.end_mark.pointer == 0 or
+             prev.end_mark.buffer[prev.end_mark.pointer - 1] != '\n')):
         spaces = token.start_mark.pointer - prev.end_mark.pointer
         if max != - 1 and spaces > max:
             return LintProblem(token.start_mark.line + 1,
@@ -64,6 +67,16 @@ class Comment(object):
                 str(self) == str(other))
 
 
+def get_line_indent(token):
+    """Finds the indent of the line the token starts in."""
+    start = token.start_mark.buffer.rfind('\n', 0,
+                                          token.start_mark.pointer) + 1
+    content = start
+    while token.start_mark.buffer[content] == ' ':
+        content += 1
+    return content - start
+
+
 def get_comments_between_tokens(token1, token2, skip_first_line=False):
     if token2 is None:
         buf = token1.end_mark.buffer[token1.end_mark.pointer:]
@@ -91,3 +104,15 @@ def get_comments_between_tokens(token1, token2, skip_first_line=False):
         pointer += len(line) + 1
         line_no += 1
         column_no = 1
+
+
+def is_explicit_key(token):
+    # explicit key:
+    #   ? key
+    #   : v
+    # or
+    #   ?
+    #     key
+    #   : v
+    return (token.start_mark.pointer < token.end_mark.pointer and
+            token.start_mark.buffer[token.start_mark.pointer] == '?')

yamllint/rules/document_end.py

@@ -14,6 +14,66 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to require or forbid the use of document end marker (``...``).
+
+.. rubric:: Options
+
+* Set ``present`` to ``yes`` when the document end marker is required, or to
+  ``no`` when it is forbidden.
+
+.. rubric:: Examples
+
+#. With ``document-end: {present: yes}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ...
+    ---
+    - this
+    - is: another one
+    ...
+
+   the following code snippet would **FAIL**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ---
+    - this
+    - is: another one
+    ...
+
+#. With ``document-end: {present: no}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ---
+    - this
+    - is: another one
+
+   the following code snippet would **FAIL**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ...
+    ---
+    - this
+    - is: another one
+"""
+
+
 import yaml
 
 from yamllint.errors import LintProblem
@@ -24,7 +84,7 @@ TYPE = 'token'
 CONF = {'present': bool}
 
 
-def check(conf, token, prev, next):
+def check(conf, token, prev, next, context):
     if conf['present']:
         if (isinstance(token, yaml.StreamEndToken) and
                 not (isinstance(prev, yaml.DocumentEndToken) or

yamllint/rules/document_start.py

@@ -14,6 +14,56 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to require or forbid the use of document start marker (``---``).
+
+.. rubric:: Options
+
+* Set ``present`` to ``yes`` when the document start marker is required, or to
+  ``no`` when it is forbidden.
+
+.. rubric:: Examples
+
+#. With ``document-start: {present: yes}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ---
+    - this
+    - is: another one
+
+   the following code snippet would **FAIL**:
+   ::
+
+    this:
+      is: [a, document]
+    ---
+    - this
+    - is: another one
+
+#. With ``document-start: {present: no}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    this:
+      is: [a, document]
+    ...
+
+   the following code snippet would **FAIL**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ...
+"""
+
+
 import yaml
 
 from yamllint.errors import LintProblem
@@ -24,7 +74,7 @@ TYPE = 'token'
 CONF = {'present': bool}
 
 
-def check(conf, token, prev, next):
+def check(conf, token, prev, next, context):
     if conf['present']:
         if (isinstance(prev, (yaml.StreamStartToken,
                               yaml.DocumentEndToken,

yamllint/rules/empty_lines.py

@@ -14,6 +14,42 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to set a maximal number of allowed consecutive blank lines.
+
+.. rubric:: Options
+
+* ``max`` defines the maximal number of empty lines allowed in the document.
+* ``max-start`` defines the maximal number of empty lines allowed at the
+  beginning of the file. This option takes precedence over ``max``.
+* ``max-end`` defines the maximal number of empty lines allowed at the end of
+  the file.  This option takes precedence over ``max``.
+
+.. rubric:: Examples
+
+#. With ``empty-lines: {max: 1}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    - foo:
+        - 1
+        - 2
+
+    - bar: [3, 4]
+
+   the following code snippet would **FAIL**:
+   ::
+
+    - foo:
+        - 1
+        - 2
+
+
+    - bar: [3, 4]
+"""
+
+
 from yamllint.errors import LintProblem
 
 

yamllint/rules/hyphens.py

@@ -14,6 +14,60 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to control the number of spaces after hyphens (``-``).
+
+.. rubric:: Options
+
+* ``max-spaces-after`` defines the maximal number of spaces allowed after
+  hyphens.
+
+.. rubric:: Examples
+
+#. With ``hyphens: {max-spaces-after: 1}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    - first list:
+        - a
+        - b
+    - - 1
+      - 2
+      - 3
+
+   the following code snippet would **FAIL**:
+   ::
+
+    -  first list:
+         - a
+         - b
+
+   the following code snippet would **FAIL**:
+   ::
+
+    - - 1
+      -  2
+      - 3
+
+#. With ``hyphens: {max-spaces-after: 3}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    -   key
+    -  key2
+    - key42
+
+   the following code snippet would **FAIL**:
+   ::
+
+    -    key
+    -   key2
+    -  key42
+"""
+
+
 import yaml
 
 from yamllint.rules.common import spaces_after
@@ -24,7 +78,7 @@ TYPE = 'token'
 CONF = {'max-spaces-after': int}
 
 
-def check(conf, token, prev, next):
+def check(conf, token, prev, next, context):
     if isinstance(token, yaml.BlockEntryToken):
         problem = spaces_after(token, prev, next,
                                max=conf['max-spaces-after'],

yamllint/rules/indentation.py

@@ -14,57 +14,371 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to control the indentation.
+
+.. rubric:: Options
+
+* ``spaces`` defines the number of spaces that represent an indentation level.
+* ``indent-sequences`` defines whether block sequences should be indented or
+  not (when in a mapping, this indentation is not mandatory -- some people
+  perceive the ``-`` as part of the indentation). Possible values: ``yes``,
+  ``no`` and ``whatever`` (the latter means either indenting or not indenting
+  block sequences is OK.
+* ``check-multi-line-strings`` defines whether to lint indentation in
+  multi-line strings. Set to ``yes`` to enable, ``no`` to disable.
+
+.. rubric:: Examples
+
+#. With ``indentation: {spaces: 1}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    history:
+     - name: Unix
+       date: 1969
+     - name: Linux
+       date: 1991
+    nest:
+     recurse:
+      - haystack:
+         needle
+
+#. With ``indentation: {spaces: 4}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    history:
+        - name: Unix
+          date: 1969
+        - name: Linux
+          date: 1991
+    nest:
+        recurse:
+            - haystack:
+                  needle
+
+   the following code snippet would **FAIL**:
+   ::
+
+    history:
+      - name: Unix
+        date: 1969
+      - name: Linux
+        date: 1991
+    nest:
+      recurse:
+        - haystack:
+            needle
+
+#. With ``indentation: {spaces: 2, indent-sequences: no}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    list:
+    - flying
+    - spaghetti
+    - monster
+
+   the following code snippet would **FAIL**:
+   ::
+
+    list:
+      - flying
+      - spaghetti
+      - monster
+
+#. With ``indentation: {spaces: 2, indent-sequences: whatever}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    list:
+    - flying:
+      - spaghetti
+      - monster
+    - not flying:
+        - spaghetti
+        - sauce
+
+#. With ``indentation: {spaces: 4, check-multi-line-strings: yes}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    Blaise Pascal:
+        Je vous écris une longue lettre parce que
+        je n'ai pas le temps d'en écrire une courte.
+
+   the following code snippet would **FAIL**:
+   ::
+
+    C code:
+        void main() {
+            printf("foo");
+        }
+
+   the following code snippet would **PASS**:
+   ::
+
+    C code:
+        void main() {
+        printf("bar");
+        }
+"""
+
 import yaml
 
 from yamllint.errors import LintProblem
+from yamllint.rules.common import is_explicit_key
 
 
 ID = 'indentation'
 TYPE = 'token'
-CONF = {'spaces': int}
+CONF = {'spaces': int,
+        'indent-sequences': (True, False, 'whatever'),
+        'check-multi-line-strings': bool}
+
+ROOT, MAP, B_SEQ, F_SEQ, KEY, VAL = range(6)
 
 
-def check(conf, token, prev, next):
-    if isinstance(token, (yaml.StreamStartToken, yaml.StreamEndToken)):
+class Parent(object):
+    def __init__(self, type, indent):
+        self.type = type
+        self.indent = indent
+        self.explicit_key = False
+
+
+def check_scalar_indentation(conf, token, context):
+    if token.start_mark.line == token.end_mark.line:
         return
 
-    # Check if first token in line
-    if (not isinstance(prev, (yaml.StreamStartToken, yaml.DirectiveToken)) and
-            token.start_mark.line == prev.end_mark.line):
-        return
+    if token.plain:
+        expected_indent = token.start_mark.column
+    elif token.style in ('"', "'"):
+        expected_indent = token.start_mark.column + 1
+    elif token.style in ('>', '|'):
+        if context['stack'][-1].type == B_SEQ:
+            # - >
+            #     multi
+            #     line
+            expected_indent = token.start_mark.column + conf['spaces']
+        elif context['stack'][-1].type == KEY:
+            assert context['stack'][-1].explicit_key
+            # - ? >
+            #       multi-line
+            #       key
+            #   : >
+            #       multi-line
+            #       value
+            expected_indent = token.start_mark.column + conf['spaces']
+        elif context['stack'][-1].type == VAL:
+            if token.start_mark.line + 1 > context['cur_line']:
+                # - key:
+                #     >
+                #       multi
+                #       line
+                expected_indent = context['stack'][-1].indent + conf['spaces']
+            elif context['stack'][-2].explicit_key:
+                # - ? key
+                #   : >
+                #       multi-line
+                #       value
+                expected_indent = token.start_mark.column + conf['spaces']
+            else:
+                # - key: >
+                #     multi
+                #     line
+                expected_indent = context['stack'][-2].indent + conf['spaces']
+        else:
+            expected_indent = context['stack'][-1].indent + conf['spaces']
 
-    if token.start_mark.column % conf['spaces'] != 0:
-        yield LintProblem(
-            token.end_mark.line + 1, token.start_mark.column + 1,
-            'indentation is not a multiple of %d' % conf['spaces'])
-        return
+    line_no = token.start_mark.line + 1
 
-    if isinstance(prev, (yaml.StreamStartToken,
-                         yaml.DirectiveToken,
-                         yaml.DocumentStartToken,
-                         yaml.DocumentEndToken)):
-        indent = 0
-    else:
-        buffer = prev.end_mark.buffer
-        start = buffer.rfind('\n', 0, prev.end_mark.pointer) + 1
+    line_start = token.start_mark.pointer
+    while True:
+        line_start = token.start_mark.buffer.find(
+            '\n', line_start, token.end_mark.pointer - 1) + 1
+        if line_start == 0:
+            break
+        line_no += 1
 
         indent = 0
-        while buffer[start + indent] == ' ':
+        while token.start_mark.buffer[line_start + indent] == ' ':
             indent += 1
+        if token.start_mark.buffer[line_start + indent] == '\n':
+            continue
 
-    if token.start_mark.column > indent:
-        if not isinstance(prev, (yaml.BlockSequenceStartToken,
-                                 yaml.BlockMappingStartToken,
-                                 yaml.FlowSequenceStartToken,
-                                 yaml.FlowMappingStartToken,
-                                 yaml.KeyToken,
-                                 yaml.ValueToken)):
-            yield LintProblem(
-                token.end_mark.line + 1, token.start_mark.column + 1,
-                'unexpected indentation')
+        if indent < expected_indent:
+            yield LintProblem(line_no, indent + 1,
+                              ('wrong indentation: expected at least %d but '
+                               'found %d') % (expected_indent, indent))
+        elif conf['check-multi-line-strings'] and indent > expected_indent:
+            yield LintProblem(line_no, indent + 1,
+                              'wrong indentation: expected %d but found %d' %
+                              (expected_indent, indent))
 
-        elif token.start_mark.column != indent + conf['spaces']:
-            yield LintProblem(
-                token.end_mark.line + 1, token.start_mark.column + 1,
-                'found indentation of %d instead of %d' %
-                (token.start_mark.column, indent + conf['spaces']))
+
+def check(conf, token, prev, next, context):
+    if 'stack' not in context:
+        context['stack'] = [Parent(ROOT, 0)]
+        context['cur_line'] = -1
+
+    # Step 1: Lint
+
+    needs_lint = (
+        not isinstance(token, (yaml.StreamStartToken, yaml.StreamEndToken)) and
+        not isinstance(token, yaml.BlockEndToken) and
+        not (isinstance(token, yaml.ScalarToken) and token.value == '') and
+        token.start_mark.line + 1 > context['cur_line'])
+
+    if needs_lint:
+        found_indentation = token.start_mark.column
+        expected = context['stack'][-1].indent
+
+        if isinstance(token, (yaml.FlowMappingEndToken,
+                              yaml.FlowSequenceEndToken)):
+            expected = 0
+        elif (context['stack'][-1].type == KEY and
+                context['stack'][-1].explicit_key and
+                not isinstance(token, yaml.ValueToken)):
+            expected += conf['spaces']
+
+        if found_indentation != expected:
+            yield LintProblem(token.start_mark.line + 1, found_indentation + 1,
+                              'wrong indentation: expected %d but found %d' %
+                              (expected, found_indentation))
+
+    if isinstance(token, yaml.ScalarToken):
+        for problem in check_scalar_indentation(conf, token, context):
+            yield problem
+
+    # Step 2.a:
+
+    if needs_lint:
+        context['cur_line_indent'] = found_indentation
+        context['cur_line'] = token.end_mark.line + 1
+
+    # Step 2.b: Update state
+
+    if isinstance(token, yaml.BlockMappingStartToken):
+        assert isinstance(next, yaml.KeyToken)
+        if next.start_mark.line == token.start_mark.line:
+            #   - a: 1
+            #     b: 2
+            # or
+            #   - ? a
+            #     : 1
+            indent = token.start_mark.column
+        else:
+            #   - ?
+            #       a
+            #     : 1
+            indent = token.start_mark.column + conf['spaces']
+
+        context['stack'].append(Parent(MAP, indent))
+
+    elif isinstance(token, yaml.FlowMappingStartToken):
+        if next.start_mark.line == token.start_mark.line:
+            #   - {a: 1, b: 2}
+            indent = next.start_mark.column
+        else:
+            #   - {
+            #   a: 1, b: 2
+            # }
+            indent = context['cur_line_indent'] + conf['spaces']
+
+        context['stack'].append(Parent(MAP, indent))
+
+    elif isinstance(token, yaml.BlockSequenceStartToken):
+        #   - - a
+        #     - b
+        assert next.start_mark.line == token.start_mark.line
+        assert isinstance(next, yaml.BlockEntryToken)
+
+        indent = token.start_mark.column
+
+        context['stack'].append(Parent(B_SEQ, indent))
+
+    elif isinstance(token, yaml.FlowSequenceStartToken):
+        if next.start_mark.line == token.start_mark.line:
+            #   - [a, b]
+            indent = next.start_mark.column
+        else:
+            #   - [
+            #   a, b
+            # ]
+            indent = context['cur_line_indent'] + conf['spaces']
+
+        context['stack'].append(Parent(F_SEQ, indent))
+
+    elif isinstance(token, (yaml.BlockEndToken,
+                            yaml.FlowMappingEndToken,
+                            yaml.FlowSequenceEndToken)):
+        assert context['stack'][-1].type in (MAP, B_SEQ, F_SEQ)
+        context['stack'].pop()
+
+    elif isinstance(token, yaml.KeyToken):
+        indent = context['stack'][-1].indent
+
+        context['stack'].append(Parent(KEY, indent))
+
+        context['stack'][-1].explicit_key = is_explicit_key(token)
+
+    if context['stack'][-1].type == VAL:
+        context['stack'].pop()
+        assert context['stack'][-1].type == KEY
+        context['stack'].pop()
+
+    elif isinstance(token, yaml.ValueToken):
+        assert context['stack'][-1].type == KEY
+
+        # Discard empty values
+        if isinstance(next, (yaml.BlockEndToken,
+                             yaml.FlowMappingEndToken,
+                             yaml.FlowSequenceEndToken,
+                             yaml.KeyToken)):
+            context['stack'].pop()
+        else:
+            if context['stack'][-1].explicit_key:
+                #   ? k
+                #   : value
+                # or
+                #   ? k
+                #   :
+                #     value
+                indent = context['stack'][-1].indent + conf['spaces']
+            elif next.start_mark.line == prev.start_mark.line:
+                #   k: value
+                indent = next.start_mark.column
+            elif isinstance(next, (yaml.BlockSequenceStartToken,
+                                   yaml.BlockEntryToken)):
+                # NOTE: We add BlockEntryToken in the test above because
+                # sometimes BlockSequenceStartToken are not issued. Try
+                # yaml.scan()ning this:
+                #     '- lib:\n'
+                #     '  - var\n'
+                if conf['indent-sequences'] is False:
+                    indent = context['stack'][-1].indent
+                elif conf['indent-sequences'] is True:
+                    indent = context['stack'][-1].indent + conf['spaces']
+                else:  # 'whatever'
+                    if next.start_mark.column == context['stack'][-1].indent:
+                        #   key:
+                        #   - e1
+                        #   - e2
+                        indent = context['stack'][-1].indent
+                    else:
+                        #   key:
+                        #     - e1
+                        #     - e2
+                        indent = context['stack'][-1].indent + conf['spaces']
+            else:
+                #   k:
+                #     value
+                indent = context['stack'][-1].indent + conf['spaces']
+
+            context['stack'].append(Parent(VAL, indent))

yamllint/rules/line_length.py

@@ -14,6 +14,33 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to set a limit to lines length.
+
+.. rubric:: Options
+
+* ``max`` defines the maximal (inclusive) length of lines.
+
+.. rubric:: Examples
+
+#. With ``line-length: {max: 70}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    long sentence:
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+      eiusmod tempor incididunt ut labore et dolore magna aliqua.
+
+   the following code snippet would **FAIL**:
+   ::
+
+    long sentence:
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
+      tempor incididunt ut labore et dolore magna aliqua.
+"""
+
+
 from yamllint.errors import LintProblem
 
 

yamllint/rules/new_line_at_end_of_file.py

@@ -14,6 +14,16 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to require a new line character (``\\n``) at the end of files.
+
+The POSIX standard `requires the last line to end with a new line character
+<http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206>`_.
+All UNIX tools expect a new line at the end of files. Most text editors use
+this convention too.
+"""
+
+
 from yamllint.errors import LintProblem
 
 

yamllint/rules/new_lines.py

@@ -14,12 +14,22 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to force the type of new line characters.
+
+.. rubric:: Options
+
+* Set ``type`` to ``unix`` to use UNIX-typed new line characters (``\\n``), or
+  ``dos`` to use DOS-typed new line characters (``\\r\\n``).
+"""
+
+
 from yamllint.errors import LintProblem
 
 
 ID = 'new-lines'
 TYPE = 'line'
-CONF = {'type': str}
+CONF = {'type': ('unix', 'dos')}
 
 
 def check(conf, line):

yamllint/rules/trailing_spaces.py

@@ -14,6 +14,29 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+"""
+Use this rule to forbid trailing spaces at the end of lines.
+
+.. rubric:: Examples
+
+#. With ``trailing-spaces: {}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    this document doesn't contain
+    any trailing
+    spaces
+
+   the following code snippet would **FAIL**:
+   ::
+
+    this document contains     """ """
+    trailing spaces
+    on lines 1 and 3         """ """
+"""
+
+
 import string
 
 from yamllint.errors import LintProblem