Add Coding Standard

Author: simPod

.gitignore

@@ -1,3 +1,5 @@
+.phpcs-cache
+phpcs.xml
 phpunit.xml
 composer.lock
 vendor/

.travis.yml

@@ -54,6 +54,27 @@ jobs:
         - composer config minimum-stability dev
         - travis_retry composer update -n --prefer-dist
 
+    - stage: Pull request coding standard
+      if: type = pull_request
+      php: 7.1
+      install: travis_retry composer install --prefer-dist
+      script:
+        - |
+          if [ $TRAVIS_BRANCH != "master" ]; then
+            git remote set-branches --add origin $TRAVIS_BRANCH;
+            git fetch origin $TRAVIS_BRANCH;
+          fi
+        - git merge-base origin/$TRAVIS_BRANCH $TRAVIS_PULL_REQUEST_SHA || git fetch origin +refs/pull/$TRAVIS_PULL_REQUEST/merge --unshallow
+        - wget https://github.com/diff-sniffer/git/releases/download/0.1.0/git-phpcs.phar
+        - php git-phpcs.phar origin/$TRAVIS_BRANCH...$TRAVIS_PULL_REQUEST_SHA
+
+#    - stage: Coding standard
+#      if: NOT type = pull_request
+#      php: 7.1
+#      install: travis_retry composer install --prefer-dist
+#      script:
+#        - ./vendor/bin/phpcs
+
     - stage: Code Quality
       install: travis_retry composer install --prefer-dist
       script: vendor/bin/phpstan analyse -c phpstan.neon src

composer.json

@@ -17,8 +17,9 @@
     "ext-curl": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.0",
-    "phpstan/phpstan": "^0.9.2"
+    "doctrine/coding-standard": "^4.0",
+    "phpstan/phpstan": "^0.9.2",
+    "phpunit/phpunit": "^7.0"
   },
   "autoload": {
     "psr-4": {

phpcs.xml.dist

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ruleset>
+    <arg name="basepath" value="."/>
+    <arg name="extensions" value="php"/>
+    <arg name="colors"/>
+    <arg name="parallel" value="80"/>
+    <arg name="cache" value=".phpcs-cache"/>
+
+    <!-- Ignore warnings, show progress of the run and show sniff names -->
+    <arg value="nps"/>
+
+    <file>src</file>
+
+    <rule ref="Doctrine"/>
+
+    <rule ref="SlevomatCodingStandard.Namespaces.AlphabeticallySortedUses">
+        <properties>
+            <property name="psr12Compatible" type="bool" value="true"/>
+        </properties>
+    </rule>
+
+</ruleset>