plone.recipe.codeanalysis 1.0b2

Introduction

plone.recipe.codeanalysis provides static code analysis for Buildout-based Python projects, including flake8, JSHint, CSS Lint, zptlint, and other code checks.

This buildout recipe creates a script to run the code analysis:

bin/code-analysis

By default plone.recipe.codeanalysis also creates a git pre-commit hook, in order to run the code analysis automatically before each commit.

Installation

Just add a code-analysis section to your buildout.cfg:

[buildout]
parts += code-analysis

[code-analysis]
recipe = plone.recipe.codeanalysis
directory = ${buildout:directory}/src

The directory option is not required. Though, if you don’t specify a directory the code analysis will check every file in your buildout directory.

Links

Code repository:

https://github.com/plone/plone.recipe.codeanalysis

Continuous Integration:

https://travis-ci.org/plone/plone.recipe.codeanalysis

Issue Tracker:

https://github.com/plone/plone.recipe.codeanalysis/issues

Supported options

The recipe supports the following options:

directory

Directory that is subject to the code analysis.

pre-commit-hook

If set to True, a git pre-commit hook is installed that runs the code analysis before each commit.

flake8

If set to True, run Flake8 code analysis. Default is True.

flake8-ignore

Skip errors or warnings. See Flake8 documentation for error codes. Default is none.

flake8-exclude

Comma-separated filename and glob patterns default. Say you want to exclude bootstrap.py, setup.py and all collective.* and plone.* packages. Just set “flake8-exclude=bootstrap.py,docs,*.egg,setup.py,collective.*, plone.*” in your buildout configuration. Default is bootstrap.py,docs,*.egg.

flake8-max-complexity

McCabe complexity threshold. Default is 10.

flake8-max-line-length

Set maximum allowed line length. Default is 79.

jshint

If set to True, jshint code analysis is run. Default is False. Note that plone.recipe.codeanalysis requires jshint >= 1.0.

jshint-bin

JSHint executable. Default is jshint. If you have JSHint installed on your system and in your path, there is nothing to do. To install JSHint in your buildout, use the following:

[jshint]
recipe = gp.recipe.node
npms = jshint
scripts = jshint

set jshint-bin to ‘${buildout:directory}/bin/jshint’.

jshint-exclude

Allows you to specify directories which you don’t want to be linted. Default is none. If you want JSHint to skip some files you can list them in a file named .jshintignore. See JSHint documentation for more details.

csslint

If set to True, CSS Lint code analysis is run. Default is False.

CSS Lint options should be configured using a .csslintrc file. A typical .csslintrc file will look like this:

--format=compact
--quiet
--ignore=adjoining-classes,floats,font-faces,font-sizes,ids,qualified-headings,unique-headings
--exclude-list=foo/bar/static/third-party.css

This typical configuration includes a list of CSS rules that will be ignored as they are considered useless.

See CSS Lint documentation for a detailed list and description of the rules.

csslint-bin

Set the path to a custom version of CSS Lint. Default is bin/csslint.

If you have CSS Lint installed in your system and path, set csslint-bin to ‘csslint’. To install CSS Lint in your buildout, use the following:

[csslint]
recipe = gp.recipe.node
npms = csslint
scripts = csslint

zptlint

If set to True, zptlint code analysis is run. Default is False.

Note that the buildout itself already depends on zptlint, so no extra configuration is needed.

zptlint-bin

Set the path to a custom version of zptlint. Default is bin/zptlint.

deprecated-methods

If set to True, warnings about deprecated methods will be printed. Default is False.

utf8-header

If set to True, Python files without a utf-8 header (like # -*- coding: utf-8 -*-) will cause a warning. Default is False.

clean-lines

If set to True, any file containing trailing spaces or tabs anywhere on the lines will cause a warning. Default is False.

prefer-single-quotes

If set to True, Python files will be scanned searching for strings quoted with double quote signs ("). Default is False.

string-formatting

If set to True, Python files will be scanned searching for old-style string formatting (i.e. '%s' % var). See PEP 3101. Default is False.

imports

If set to True, checks that imports in Python files follow plone.api conventions. Default is False.

debug-statements

If set to True, scan Python files looking for debug-like statements. Default is False.

Known Issues

JSHint “ERROR: Unknown option –verbose”:

JSHint                [ OK ]
ERROR: Unknown option --verbose

Upgrade JSHint to latest version (>= 1.0) to fix this issue, e.g.:

$ sudo npm install -g jshint

Example usage

Minimal buildout:

>>> write('buildout.cfg',
... """
... [buildout]
... parts = code-analysis
...
... [code-analysis]
... recipe = plone.recipe.codeanalysis
... directory = %(directory)s
... """ % {
...     'directory' : '${buildout:directory}/plone/recipe/codeanalysis',
... })

Running the buildout gives us a ‘code-analysis’ script that runs the entire code analysis:

>>> buildout_output_lower = system(buildout).lower()
>>> '/sample-buildout/bin/code-analysis' in buildout_output_lower
True

It is also possible to run single code analysis scripts:

>>> '/sample-buildout/bin/code-analysis-flake8' in buildout_output_lower
True
>>> '/sample-buildout/bin/code-analysis-jshint' in buildout_output_lower
True

Flake 8 and ZPTLint are installed by the buildout script, there is no need to install them on the system:

>>> '/sample-buildout/bin/flake8' in buildout_output_lower
True

>>> '/sample-buildout/bin/zptlint' in buildout_output_lower
True

Deprecate method analysis script is installed:

>>> '/sample-buildout/bin/code-analysis-deprecated-methods' in buildout_output_lower
True

The script to check if python files have an utf-8 encoding header is installed:

>>> '/sample-buildout/bin/code-analysis-utf8-header' in buildout_output_lower
True

The script to warn about trailing spaces or tabs on files is installed:

>>> '/sample-buildout/bin/code-analysis-clean-lines' in buildout_output_lower
True

Double quotes checker script is installed:

>>> '/sample-buildout/bin/code-analysis-prefer-single-quotes' in buildout_output_lower
True

The script to check for old style string formatting is installed:

>>> '/sample-buildout/bin/code-analysis-string-formatting' in buildout_output_lower
True

The script to check for plone.api style imports is installed:

>>> '/sample-buildout/bin/code-analysis-imports' in buildout_output_lower
True

The script to check for debug-like statements in python code is installed:

>>> '/sample-buildout/bin/code-analysis-debug-statements' in buildout_output_lower
True

By default a git pre-commit hook is installed. Though, this does not work if the current directory is not a git repository:

>>> 'unable to create git pre-commit hook, this does not seem to be a git repository' in buildout_output_lower
True

If we have a git repository:

>>> import subprocess
>>> subprocess.call(['mkdir', '-p', '.git/hooks'])
0

And run buildout again:

>>> buildout_output_lower = system(buildout).lower()

Then the git pre-commit hook has been installed:

>>> 'install git pre-commit hook.' in buildout_output_lower
True