Installation

The recommended method of installing this library is via Composer.

Composer

Global Installation

Run the following command from your project root:

composer global require olivertappin/phpcs-diff

Manual Installation

Alternatively, you can manually include a dependency for olivertappin/phpcs-diff in your composer.json file. For example:

{
    "require-dev": {
        "olivertappin/phpcs-diff": "^2.0"
    }
}

And run composer update olivertappin/phpcs-diff.

Git Clone

You can also download the phpcs-diff source and create a symlink to your /usr/bin directory:

git clone https://github.com/olivertappin/phpcs-diff.git
ln -s phpcs-diff/bin/phpcs-diff /usr/bin/phpcs-diff
cd /var/www/project
phpcs-diff master -v

Usage

Basic Usage

phpcs-diff <current-branch> <base-branch> -v

Where the current branch you are on is the branch you are comparing with, and develop is the base branch. In this example, phpcs-diff would run the following diff statement behind the scenes:

git diff my-current-branch develop

Please note:

• The -v flag is optional. This returns a verbose output during processing.
• The current-branch parameter is optional. If this is not defined, phpcs-diff will use the current commit hash via git rev-parse --verify HEAD.
• You must have a ruleset.xml defined in your project base directory.

After running phpcs-diff, the executable will return an output similar to the following:

########## START OF PHPCS CHECK ##########
module/Poject/src/Console/Script.php
 - Line 28 (WARNING) Line exceeds 120 characters; contains 190 characters
 - Line 317 (ERROR) Blank line found at end of control structure
########### END OF PHPCS CHECK ###########

Currently this is the only supported format however, I will look into adding additional formats (much like phpcs) in the near future.

Travis CI Usage

To use this as part of your CI/CD pipeline, create a script with the following:

#!/bin/bash
set -e
if [ ! -z "$TRAVIS_PULL_REQUEST_BRANCH" ]; then
  git fetch `git config --get remote.origin.url` $TRAVIS_BRANCH\:refs/remotes/origin/$TRAVIS_BRANCH;
  composer global require olivertappin/phpcs-diff;
  ~/.composer/vendor/bin/phpcs-diff $TRAVIS_BRANCH;
else
  echo "This test does not derive from a pull-request."
  echo "Unable to run phpcs-diff (as there's no diff)."

  # Here you might consider running phpcs instead:
  # composer global require squizlabs/php_codesniffer;
  # ~/.composer/vendor/bin/phpcs .
fi;

Which will allow you to run phpcs-diff against the diff of your pull-request.

Here's a sample of how this might look within Travis CI:

About

phpcs-diff detects violations of a defined set of coding standards based on a git diff. It uses phpcs from the PHP_CodeSniffer project.

This project helps by achieving the following:

• Speeds up your CI/CD pipeline validating changed files only, rather than the whole code base.
• Allows you to migrate legacy code bases that cannot risk changing everything at once to become fully compliant to a coding standard.

This executable works by only checking the changed lines, compared to the base branch, against all failed violations for those files, so you can be confident that any new or changed code will be compliant.

This will hopefully put you in a position where your codebase will become more compliant to that coding standard over time, and maybe you will find the resource to eventually change everything, and just run phpcs on its own.

Requirements

The latest version of phpcs-diff requires PHP version 5.6.0 or later.

This project also depends on squizlabs/php_codesniffer which is used internally to fetch the failed violations via phpcs.

Finally, the league/climate package is also installed. This is to deal with console output, but this dependency may be removed in a future release.

Contributing

See CONTRIBUTING.md for information.