Add docs

docs/Makefile

@@ -0,0 +1,130 @@
+# Makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+PAPER         =
+BUILDDIR      = _build
+
+# Internal variables.
+PAPEROPT_a4     = -D latex_paper_size=a4
+PAPEROPT_letter = -D latex_paper_size=letter
+ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+
+.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest
+
+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 "  text       to make text files"
+	@echo "  man        to make manual pages"
+	@echo "  changes    to make an overview of all changed/added/deprecated items"
+	@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/Raclette.qhcp"
+	@echo "To view the help file:"
+	@echo "# assistant -collectionFile $(BUILDDIR)/qthelp/Raclette.qhc"
+
+devhelp:
+	$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
+	@echo
+	@echo "Build finished."
+	@echo "To view the help file:"
+	@echo "# mkdir -p $$HOME/.local/share/devhelp/Raclette"
+	@echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/Raclette"
+	@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."
+
+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."
+
+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."

docs/api.rst

@@ -0,0 +1,34 @@
+.. module:: flake8
+
+flake8.engine
+=============
+
+.. autofunction:: flake8.engine.get_parser
+
+.. autofunction:: flake8.engine.get_style_guide
+
+flake8.hooks
+============
+
+.. autofunction:: flake8.hooks.git_hook
+
+.. autofunction:: flake8.hooks.hg_hook
+
+flake8.main
+===========
+
+.. autofunction:: flake8.main.main
+
+.. autofunction:: flake8.main.check_file
+
+.. autofunction:: flake8.main.check_code
+
+.. autoclass:: flake8.main.Flake8Command
+
+flake8.util
+===========
+
+For AST checkers, this module has the ``iter_child_nodes`` function and 
+handles compatibility for all versions of Python between 2.5 and 3.3. The 
+function was added to the ``ast`` module in Python 2.6 but is redefined in the 
+case where the user is running Python 2.5

docs/buildout.rst

@@ -0,0 +1,17 @@
+Buildout integration
+=====================
+
+In order to use Flake8 inside a buildout, edit your buildout.cfg and add this::
+
+    [buildout]
+
+    parts +=
+        ...
+        flake8
+
+    [flake8]
+    recipe = zc.recipe.egg
+    eggs = flake8
+           ${buildout:eggs}
+    entry-points =
+        flake8=flake8.main:main

docs/conf.py

@@ -0,0 +1,238 @@
+# -*- coding: utf-8 -*-
+#
+# This file is execfile()d with the current directory set to its containing 
+# dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+import sys, os
+
+# This environment variable makes decorators not decorate functions, so their
+# signatures in the generated documentation are still correct
+os.environ['GENERATING_DOCUMENTATION'] = "flake8"
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+sys.path.insert(0, os.path.abspath('..'))
+import flake8
+
+# -- General configuration -----------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be extensions
+# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
+extensions = ['sphinx.ext.autodoc']
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix of source filenames.
+source_suffix = '.rst'
+
+# The encoding of source files.
+#source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = u'flake8'
+copyright = u'2012-2013 - Tarek Ziade, Ian Cordasco, Florent Xicluna'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = flake8.__version__
+# The full version, including alpha/beta/rc tags.
+release = version
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+#today = ''
+# Else, today_fmt is used as the format for a strftime call.
+#today_fmt = '%B %d, %Y'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+exclude_patterns = ['_build']
+
+# The reST default role (used for this markup: `text`) to use for all documents.
+#default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+#add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+#show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+# pygments_style = 'flask_theme_support.FlaskyStyle'
+
+# A list of ignored prefixes for module index sorting.
+#modindex_common_prefix = []
+
+
+# -- Options for HTML output ---------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+html_theme = 'nature'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#html_theme_options = {}
+
+# Add any paths that contain custom themes here, relative to this directory.
+#html_theme_path = []
+
+# The name for this set of Sphinx documents.  If None, it defaults to
+# "<project> v<release> documentation".
+#html_title = None
+
+# A shorter title for the navigation bar.  Default is the same as html_title.
+#html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+#html_logo = None
+
+
+# The name of an image file (within the static path) to use as favicon of the
+# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+#html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+#html_static_path = ['_static']
+
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+#html_last_updated_fmt = '%b %d, %Y'
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+#html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+# Custom sidebar templates, maps document names to template names.
+#html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+#html_additional_pages = {}
+
+# If false, no module index is generated.
+#html_domain_indices = True
+
+# If false, no index is generated.
+#html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+#html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+#html_show_sourcelink = False
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+#html_show_sphinx = False
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+#html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it.  The value of this option must be the
+# base URL from which the finished HTML is served.
+#html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+#html_file_suffix = None
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'flake8_doc'
+
+
+# -- Options for LaTeX output --------------------------------------------------
+
+# The paper size ('letter' or 'a4').
+#latex_paper_size = 'letter'
+
+# The font size ('10pt', '11pt' or '12pt').
+#latex_font_size = '10pt'
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title, author, documentclass [howto/manual]).
+latex_documents = [
+  ('index', 'flake8.tex', u'flake8 Documentation',
+   u'Tarek Ziade', 'manual'),
+]
+
+# The name of an image file (relative to this directory) to place at the top of
+# the title page.
+#latex_logo = None
+
+# For "manual" documents, if this is true, then toplevel headings are parts,
+# not chapters.
+#latex_use_parts = False
+
+# If true, show page references after internal links.
+#latex_show_pagerefs = False
+
+# If true, show URL addresses after external links.
+#latex_show_urls = False
+
+# Additional stuff for the LaTeX preamble.
+#latex_preamble = ''
+
+# Documents to append as an appendix to all manuals.
+#latex_appendices = []
+
+# If false, no module index is generated.
+#latex_domain_indices = True
+
+
+# -- Options for manual page output --------------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    ('index', 'flake8', u'flake8 Documentation',
+     [u'Tarek Ziade', u'Ian Cordasco', u'Florent Xicluna'], 1)
+]
+
+# If true, show URL addresses after external links.
+#man_show_urls = False
+
+# -- Options for Texinfo output ------------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+  ('index', 'flake8', u'flake8 Documentation', u'Tarek Ziade',
+   'flake8', 'Code checking using pep8, pyflakes and mccabe',
+   'Miscellaneous'),
+]
+
+# Documents to append as an appendix to all manuals.
+texinfo_appendices = []

docs/config.rst

@@ -0,0 +1,28 @@
+Configuration
+=============
+
+The behaviour may be configured at two levels.
+
+Global
+------
+
+The user settings are read from the ``~/.config/flake8`` file.
+Example::
+
+  [flake8]
+  ignore = E226,E302,E41
+  max-line-length = 160
+
+Per-Project
+-----------
+
+At the project level, a ``tox.ini`` file or a ``setup.cfg`` file is read
+if present.  Only the first file is considered.  If this file does not
+have a ``[flake8]`` section, no project specific configuration is loaded.
+
+Default
+-------
+
+If the ``ignore`` option is not in the configuration and not in the arguments,
+only the error codes ``E226`` and ``E241/E242`` are ignored
+(see codes in the table below).

docs/index.rst

@@ -0,0 +1,79 @@
+======
+Flake8
+======
+
+Flake8 is a wrapper around these tools:
+
+- PyFlakes
+- pep8
+- Ned Batchelder's McCabe script
+
+Flake8 runs all the tools by launching the single ``flake8`` script.
+It displays the warnings in a per-file, merged output.
+
+It also adds a few features:
+
+- files that contain this line are skipped::
+
+    # flake8: noqa
+
+- lines that contain a ``# noqa`` comment at the end will not issue warnings.
+- a Git and a Mercurial hook.
+- a McCabe complexity checker.
+- extendable through ``flake8.extension`` entry points.
+
+QuickStart
+==========
+
+::
+
+    pip install flake8
+
+To run flake8 just invoke it against any directory or Python module::
+
+    $ flake8 coolproject
+    coolproject/mod.py:97:1: F401 'shutil' imported but unused
+    coolproject/mod.py:625:17: E225 missing whitespace around operato
+    coolproject/mod.py:729:1: F811 redefinition of function 'readlines' from line 723
+    coolproject/mod.py:1028:1: F841 local variable 'errors' is assigned to but never used
+
+The outputs of PyFlakes *and* pep8 (and the optional plugins) are merged
+and returned.
+
+flake8 offers an extra option: --max-complexity, which will emit a warning if
+the McCabe complexity of a function is higher than the value.  By default it's
+deactivated::
+
+    $ flake8 --max-complexity 12 coolproject
+    coolproject/mod.py:97:1: F401 'shutil' imported but unused
+    coolproject/mod.py:625:17: E225 missing whitespace around operator
+    coolproject/mod.py:729:1: F811 redefinition of unused 'readlines' from line 723
+    coolproject/mod.py:939:1: C901 'Checker.check_all' is too complex (12)
+    coolproject/mod.py:1028:1: F841 local variable 'errors' is assigned to but never used
+    coolproject/mod.py:1204:1: C901 'selftest' is too complex (14)
+
+This feature is quite useful to detect over-complex code.  According to McCabe,
+anything that goes beyond 10 is too complex.
+See https://en.wikipedia.org/wiki/Cyclomatic_complexity.
+
+Documentation
+=============
+
+.. toctree::
+
+    api
+    config
+    vcs
+    buildout
+    setuptools
+    warnings
+
+Original Projects
+=================
+
+Flake8 is just a glue project, all the merits go to the creators of the original
+projects:
+
+- pep8: https://github.com/jcrocholl/pep8
+- PyFlakes: https://launchpad.net/pyflakes
+- McCabe: http://nedbatchelder.com/blog/200803/python_code_complexity_microtool.html

docs/setuptools.rst

@@ -0,0 +1,21 @@
+setuptools integration
+======================
+
+If setuptools is available, Flake8 provides a command that checks the
+Python files declared by your project.  To use it, add flake8 to your
+setup_requires::
+
+    setup(
+        name="project",
+        packages=["project"],
+
+        setup_requires=[
+            "flake8"
+        ]
+    )
+
+Running ``python setup.py flake8`` on the command line will check the
+files listed in your ``py_modules`` and ``packages``.  If any warning
+is found, the command will exit with an error code::
+
+    $ python setup.py flake8

docs/vcs.rst

@@ -0,0 +1,56 @@
+VCS Hooks
+=========
+
+Mercurial hook
+--------------
+
+To use the Mercurial hook on any *commit* or *qrefresh*, change your .hg/hgrc
+file like this::
+
+    [hooks]
+    commit = python:flake8.run.hg_hook
+    qrefresh = python:flake8.run.hg_hook
+
+    [flake8]
+    strict = 0
+    complexity = 12
+
+
+If *strict* option is set to **1**, any warning will block the commit. When
+*strict* is set to **0**, warnings are just printed to the standard output.
+
+*complexity* defines the maximum McCabe complexity allowed before a warning
+is emitted.  If you don't specify it, it's just ignored.  If specified, it must
+be a positive value.  12 is usually a good value.
+
+
+Git hook
+--------
+
+To use the Git hook on any *commit*, add a **pre-commit** file in the
+*.git/hooks* directory containing::
+
+    #!/usr/bin/python
+    import sys
+    from flake8.run import git_hook
+
+    COMPLEXITY = 10
+    STRICT = False
+
+    if __name__ == '__main__':
+        sys.exit(git_hook(complexity=COMPLEXITY, strict=STRICT, ignore='E501'))
+
+
+If *strict* option is set to **True**, any warning will block the commit. When
+*strict* is set to **False** or omitted, warnings are just printed to the
+standard output.
+
+*complexity* defines the maximum McCabe complexity allowed before a warning
+is emitted.  If you don't specify it or set it to **-1**, it's just ignored.
+If specified, it must be a positive value.  12 is usually a good value.
+
+*lazy* when set to ``True`` will also take into account files not added to the
+index.
+
+Also, make sure the file is executable and adapt the shebang line so it
+points to your Python interpreter.

docs/warnings.rst

@@ -0,0 +1,49 @@
+Warning / Error codes
+=====================
+
+The convention of Flake8 is to assign a code to each error or warning, like
+the ``pep8`` tool.  These codes are used to configure the list of errors
+which are selected or ignored.
+
+Each code consists of an upper case ASCII letter followed by three digits.
+The recommendation is to use a different prefix for each plugin. A list of the
+known prefixes is published below:
+
+- ``E***``/``W***``: `pep8 errors and warnings
+  <http://pep8.readthedocs.org/en/latest/intro.html#error-codes>`_
+- ``F***``: PyFlakes codes (see below)
+- ``C9**``: McCabe complexity plugin `mccabe
+  <https://github.com/flintwork/mccabe>`_
+- ``N8**``: Naming Conventions plugin `pep8-naming
+  <https://github.com/flintwork/pep8-naming>`_
+
+
+The original PyFlakes does not provide error codes.  Flake8 patches the
+PyFlakes messages to add the following codes:
+
++------+--------------------------------------------------------------------+
+| code | sample message                                                     |
++======+====================================================================+
+| F401 | ``module`` imported but unused                                     |
++------+--------------------------------------------------------------------+
+| F402 | import ``module`` from line ``N`` shadowed by loop variable        |
++------+--------------------------------------------------------------------+
+| F403 | 'from ``module`` import \*' used; unable to detect undefined names |
++------+--------------------------------------------------------------------+
+| F404 | future import(s) ``name`` after other statements                   |
++------+--------------------------------------------------------------------+
++------+--------------------------------------------------------------------+
+| F811 | redefinition of unused ``name`` from line ``N``                    |
++------+--------------------------------------------------------------------+
+| F812 | list comprehension redefines ``name`` from line ``N``              |
++------+--------------------------------------------------------------------+
+| F821 | undefined name ``name``                                            |
++------+--------------------------------------------------------------------+
+| F822 | undefined name ``name`` in __all__                                 |
++------+--------------------------------------------------------------------+
+| F823 | local variable ``name`` ... referenced before assignment           |
++------+--------------------------------------------------------------------+
+| F831 | duplicate argument ``name`` in function definition                 |
++------+--------------------------------------------------------------------+
+| F841 | local variable ``name`` is assigned to but never used              |
++------+--------------------------------------------------------------------+

flake8/engine.py

@@ -32,6 +32,9 @@ def _register_extensions():
 
 
 def get_parser():
+    """This returns an instance of optparse.OptionParser with all the
+    extensions registered and options set. This wraps ``pep8.get_parser``.
+    """
     (extensions, parser_hooks, options_hooks) = _register_extensions()
     details = ', '.join(['%s: %s' % ext for ext in extensions])
     parser = pep8.get_parser('flake8', '%s (%s)' % (__version__, details))
@@ -67,7 +70,8 @@ class StyleGuide(pep8.StyleGuide):
 
 
 def get_style_guide(**kwargs):
-    """Parse the options and configure the checker."""
+    """Parse the options and configure the checker. This returns a sub-class 
+    of ``pep8.StyleGuide``."""
     kwargs['parser'], options_hooks = get_parser()
     styleguide = StyleGuide(**kwargs)
     options = styleguide.options

flake8/hooks.py

@@ -13,6 +13,18 @@ from flake8.main import DEFAULT_CONFIG
 
 
 def git_hook(complexity=-1, strict=False, ignore=None, lazy=False):
+    """This is the function used by the git hook.
+    
+    :param int complexity: (optional), any value > 0 enables complexity
+        checking with mccabe
+    :param bool strict: (optional), if True, this returns the total number of
+        errors which will cause the hook to fail
+    :param str ignore: (optional), a comma-separated list of errors and
+        warnings to ignore
+    :param bool lazy: (optional), allows for the instances where you don't add
+        the files to the index before running a commit, e.g., git commit -a
+    :returns: total number of errors if strict is True, otherwise 0
+    """
     gitcmd = "git diff-index --cached --name-only HEAD"
     if lazy:
         gitcmd = gitcmd.replace('--cached ', '')
@@ -30,6 +42,11 @@ def git_hook(complexity=-1, strict=False, ignore=None, lazy=False):
 
 
 def hg_hook(ui, repo, **kwargs):
+    """This is the function executed directly by Mercurial as part of the
+    hook. This is never called directly by the user, so the parameters are
+    undocumented. If you would like to learn more about them, please feel free
+    to read the official Mercurial documentation.
+    """
     complexity = ui.config('flake8', 'complexity', default=-1)
     strict = ui.configbool('flake8', 'strict', default=True)
     config = ui.config('flake8', 'config', default=True)

flake8/main.py

@@ -42,18 +42,35 @@ def main():
 
 
 def check_file(path, ignore=(), complexity=-1):
+    """Checks a file using pep8 and pyflakes by default and mccabe 
+    optionally.
+
+    :param str path: path to the file to be checked
+    :param tuple ignore: (optional), error and warning codes to be ignored
+    :param int complexity: (optional), enables the mccabe check for values > 0
+    """
     flake8_style = get_style_guide(
         config_file=DEFAULT_CONFIG, ignore=ignore, max_complexity=complexity)
     return flake8_style.input_file(path)
 
 
 def check_code(code, ignore=(), complexity=-1):
+    """Checks code using pep8 and pyflakes by default and mccabe optionally.
+
+    :param str code: code to be checked
+    :param tuple ignore: (optional), error and warning codes to be ignored
+    :param int complexity: (optional), enables the mccabe check for values > 0
+    """
     flake8_style = get_style_guide(
         config_file=DEFAULT_CONFIG, ignore=ignore, max_complexity=complexity)
     return flake8_style.input_file('-', lines=code.splitlines())
 
 
 class Flake8Command(setuptools.Command):
+    """The :class:`Flake8Command` class is used by setuptools to perform
+    checks on registered modules.
+    """
+
     description = "Run flake8 on modules registered in setuptools"
     user_options = []