Add a man page for Flake8

Document Flake8 for users expecting `man flake8` to work and include the
man page in Flake8's documentation.

Closes #247

1 files changed, 150 insertions, 0 deletions

diff --git a/docs/source/manpage.rst b/docs/source/manpage.rst
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+========
+ flake8
+========
+
+SYNOPSIS
+========
+
+.. code::
+
+    flake8 [options] [<path> <path> ...]
+
+    flake8 --help
+
+DESCRIPTION
+===========
+
+``flake8`` is a command-line utility for enforcing style consistency across
+Python projects. By default it includes lint checks provided by the PyFlakes
+project, PEP-0008 inspired style checks provided by the PyCodeStyle project,
+and McCabe complexity checking provided by the McCabe project. It will also
+run third-party extensions if they are found and installed.
+
+OPTIONS
+=======
+
+It is important to note that third-party extensions may add options which are
+not represented here. To see all options available in your installation, run::
+
+    flake8 --help
+
+All options available as of Flake8 3.1.0::
+
+    --version             show program's version number and exit
+    -h, --help            show this help message and exit
+    -v, --verbose         Print more information about what is happening in
+                          flake8. This option is repeatable and will increase
+                          verbosity each time it is repeated.
+    -q, --quiet           Report only file names, or nothing. This option is
+                          repeatable.
+    --count               Print total number of errors and warnings to standard
+                          error and set the exit code to 1 if total is not
+                          empty.
+    --diff                Report changes only within line number ranges in the
+                          unified diff provided on standard in by the user.
+    --exclude=patterns    Comma-separated list of files or directories to
+                          exclude. (Default:
+                          .svn,CVS,.bzr,.hg,.git,__pycache__,.tox,.eggs,*.egg)
+    --filename=patterns   Only check for filenames matching the patterns in this
+                          comma-separated list. (Default: *.py)
+    --stdin-display-name=STDIN_DISPLAY_NAME
+                          The name used when reporting errors from code passed
+                          via stdin. This is useful for editors piping the file
+                          contents to flake8. (Default: stdin)
+    --format=format       Format errors according to the chosen formatter.
+    --hang-closing        Hang closing bracket instead of matching indentation
+                          of opening bracket's line.
+    --ignore=errors       Comma-separated list of errors and warnings to ignore
+                          (or skip). For example, ``--ignore=E4,E51,W234``.
+                          (Default: E121,E123,E126,E226,E24,E704,W503,W504)
+    --max-line-length=n   Maximum allowed line length for the entirety of this
+                          run. (Default: 79)
+    --select=errors       Comma-separated list of errors and warnings to enable.
+                          For example, ``--select=E4,E51,W234``. (Default:
+                          E,F,W,C90)
+    --disable-noqa        Disable the effect of "# noqa". This will report
+                          errors on lines with "# noqa" at the end.
+    --show-source         Show the source generate each error or warning.
+    --statistics          Count errors and warnings.
+    --enable-extensions=ENABLE_EXTENSIONS
+                          Enable plugins and extensions that are otherwise
+                          disabled by default
+    --exit-zero           Exit with status code "0" even if there are errors.
+    --install-hook=INSTALL_HOOK
+                          Install a hook that is run prior to a commit for the
+                          supported version control systema.
+    -j JOBS, --jobs=JOBS  Number of subprocesses to use to run checks in
+                          parallel. This is ignored on Windows. The default,
+                          "auto", will auto-detect the number of processors
+                          available to use. (Default: auto)
+    --output-file=OUTPUT_FILE
+                          Redirect report to a file.
+    --tee                 Write to stdout and output-file.
+    --append-config=APPEND_CONFIG
+                          Provide extra config files to parse in addition to the
+                          files found by Flake8 by default. These files are the
+                          last ones read and so they take the highest precedence
+                          when multiple files provide the same option.
+    --config=CONFIG       Path to the config file that will be the authoritative
+                          config source. This will cause Flake8 to ignore all
+                          other configuration files.
+    --isolated            Ignore all found configuration files.
+    --benchmark           Print benchmark information about this run of Flake8
+    --bug-report          Print information necessary when preparing a bug
+                          report
+    --builtins=BUILTINS   define more built-ins, comma separated
+    --doctests            check syntax of the doctests
+    --include-in-doctest=INCLUDE_IN_DOCTEST
+                          Run doctests only on these files
+    --exclude-from-doctest=EXCLUDE_FROM_DOCTEST
+                          Skip these files when running doctests
+    --max-complexity=MAX_COMPLEXITY
+                          McCabe complexity threshold
+
+EXAMPLES
+========
+
+Simply running flake8 against the current directory::
+
+    flake8
+    flake8 .
+
+Running flake8 against a specific path::
+
+    flake8 path/to/file.py
+
+Ignoring violations from flake8::
+
+    flake8 --ignore E101
+    flake8 --ignore E1,E202
+
+Only report certain violations::
+
+    flake8 --select E101
+    flake8 --select E2,E742
+
+Analyzing only a diff::
+
+    git diff -U0 | flake8 --diff -
+
+Generate information for a bug report::
+
+    flake8 --bug-report
+
+SEE ALSO
+========
+
+Flake8 documentation: http://flake8.pycqa.org
+
+Flake8 Options and Examples: http://flake8.pycqa.org/en/latest/user/options.html
+
+PyCodeStyle documentation: http://pycodestyle.pycqa.org
+
+PyFlakes: https://github.com/pycqa/pyflakes
+
+McCabe: https://github.com/pycqa/mccabe
+
+BUGS
+====
+
+Please report all bugs to https://gitlab.com/pycqa/flake8