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Package development #phptour ! @hannesvdvreken @afup

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Hi, my name is Hannes.

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"

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madewithlove.be 20 × "&!'()

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Package development Intermediate and advanced techniques

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1. Beginner steps 2. Environments 3. Package stability

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1. Beginner steps Everyone started out as a newbie.

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BEGINNER STEPS No renaming keep the old one, but create a new

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https:/ /seld.be/notes/common-files-in-php-packages

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BEGINNER STEPS Instructions to install composer require guzzlehttp/guzzle

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BEGINNER STEPS Instructions to install NOT: “add guzzlehttp/guzzle to your composer.json”

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BEGINNER STEPS - VERSIONS Class Sdk { public function __construct(Framework\Config) { … } } /** * Register method. */ public function register() { // Register SDK class. $this->container->share('twilio', function () { return new Sdk($this->container->make('config')) }); }

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BEGINNER STEPS - VERSIONS Class Sdk { public function __construct(array $options) { … } } /** * Register method. */ public function register() { // Register SDK class. $this->container->share('twilio', function () { $config = $this->app->get('config'); return new Sdk($config->get('services.twilio')); }); }

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BEGINNER STEPS - CODE STYLE Recommendations: PSR-2

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BEGINNER STEPS - CODE STYLE Use of tooling phpcs, php-cs-fixer

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BEGINNER STEPS - CODE STYLE Do it early boy-scouting file-per-file git blame open pull requests

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BEGINNER STEPS - TESTS/SPECS Not just the happy path

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BEGINNER STEPS - TESTS/SPECS It’s your insurance in multiple ways

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BEGINNER STEPS - VERSIONING semver.org read it

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BEGINNER STEPS - VERSIONING Release often

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BEGINNER STEPS - CHANGELOG Document releases changelog.md

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BEGINNER STEPS - CHANGELOG # Change Log All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/). ## [Unreleased][unreleased] ### Changed - Improve argument against commit logs. ## [0.0.8] - 2015-02-17 ### Changed - Update year to match in every README example. - Reluctantly stop making fun of Brits only, since most of the world writes dates in a strange way. ### Fixed - Fix typos in recent README changes. - Update outdated unreleased diff link.

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BEGINNER STEPS - CHANGELOG keepachangelog.com

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changehub.io

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BEGINNER STEPS - CHANGELOG upgrade.md

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BEGINNER STEPS - CHANGELOG Release often

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BEGINNER STEPS GitHub PC test service packagist

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BEGINNER STEPS GitHub PC test service packagist git push

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BEGINNER STEPS GitHub PC test service packagist webhook webhook

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BEGINNER STEPS GitHub PC test service packagist analyses composer.json /stores version runs tests

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BEGINNER STEPS GitHub PC test service packagist status green!

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BEGINNER STEPS - README.MD Code samples copy-paste

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BEGINNER STEPS - README.MD // open an image file $img = Image::make('public/foo.jpg'); // resize image instance $img->resize(320, 240); // insert a watermark $img->insert('public/watermark.png'); // save image in desired format $img->save('public/bar.jpg');

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BEGINNER STEPS No license is the worst http:/ /choosealicense.com/

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BEGINNER STEPS - CONTRIBUTING Instructions how to test how to make pull request philosophy

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BEGINNER STEPS Congrats, you’re no longer a newbie!

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2. Environments

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INTERMEDIATE TIPS - ENVIRONMENTS Packages have environments too

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INTERMEDIATE TIPS - ENVIRONMENTS dev/local test/ci production

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INTERMEDIATE TIPS - ENVIRONMENTS - DEV & CI not in production: composer require --dev also installs require-dev dependencies

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INTERMEDIATE TIPS - ENVIRONMENTS - CI CI only: code coverage reporting

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INTERMEDIATE TIPS - ENVIRONMENTS - CI phpunit --coverage-html=/tmp/coverage/; vs phpunit --coverage-clover=/tmp/coverage.xml; ocular code-coverage:upload /tmp/coverage.xml;

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INTERMEDIATE TIPS - ENVIRONMENTS - PROD Keep your tests out of other peoples production

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INTERMEDIATE TIPS - CLEAN DISTS --prefer-dist

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INTERMEDIATE TIPS - CLEAN DISTS .gitattributes

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.gitattributes

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INTERMEDIATE TIPS - CLEAN DISTS "autoload": { "psr-4": { "GuzzleHttp\\": "src/" } }, "autoload-dev": { "psr-4": { "GuzzleHttp\\Stubs\\": "tests/stubs/" } }

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INTERMEDIATE TIPS - COMPOSER SCRIPTS Don’t do composer require --global when you need it in CI

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INTERMEDIATE TIPS - COMPOSER SCRIPTS dev-dependencies + composer scripts

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INTERMEDIATE TIPS - COMPOSER SCRIPTS "require-dev": { "phpunit/phpunit": "~1.0", }, "scripts": { "unit-tests": "phpunit —coverage-clover…" },

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INTERMEDIATE TIPS - RECAP - dev dependencies - exclude files from distributions - composer scripts

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3. Package stability

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STABILITY As package maintainer: Less major releases

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STABILITY If a dependency has new major version, your package needs new major version.

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Trick #1 STABILITY

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Keep number of hard requirements low STABILITY

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STABILITY - SOFT-REQUIREMENTS Soft requirements eg: use decorators

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use Psr\Cache\CacheItemPool; class CacheDecorator implements … { … } STABILITY - SOFT-REQUIREMENTS

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STABILITY - SOFT-REQUIREMENTS Even better: separate package

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{ "name": "league/flysystem-eventable-filesystem", "require": { "php": ">=5.4.0", "league/event": "~1.0", "league/flysystem": "~1.0" }, … STABILITY - SOFT-REQUIREMENTS

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Trick #2 STABILITY - DECOUPLING

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Depend on interface packages STABILITY - DECOUPLING

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STABILITY - DECOUPLING Interface packages: - only interfaces - zero dependencies

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concept virtual package is a high level placeholder for a dependency on a more low level implementation STABILITY - DECOUPLING

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company/sdk requires (1.0.0) psr/cache-implementation requires (1.0.0) psr/cache

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psr/cache-implementation provides (1.0.0) requires (1.0.0) league/flysystem requires (^1.0) cache/filesystem-adapter psr/cache

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company/sdk application requires (x.y.z) requires (1.0.0) psr/cache-implementation

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company/sdk requires (1.0.0) psr/cache-implementation provides (1.0.0) requires (1.0.0) application requires (x.y.z) requires (0.5.0) requires (1.0.0) cache/filesystem-adapter psr/cache requires (^1.0) league/flysystem

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STABILITY - DECOUPLING - BENEFITS Users can choose low level packages they want

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STABILITY - DECOUPLING - BENEFITS Users don’t get locked-in to a major version

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Prefer having less hard dependencies STABILITY - RECAP

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Prefer requiring stabler packages STABILITY - RECAP

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STABILITY - RECAP Prefer requiring virtual packages

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DECOUPLING - OTHER CASES - Logging (PSR-3) - HTTP (PSR-7) - Caching (PSR-6) - File system (Flysystem)

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Semver checker ^ vs ~ Marketing Communication (empathy)

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RECAP 1. Beginner steps 2. Environments 3. Stability

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Thank you! https:/ /joind.in/talk/28a72 @hannesvdvreken @afup

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First: Questions, Then: Lunch! @hannesvdvreken @afup

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• http:/ /mwl.be REFERENCES