Extend Travis CI config to run PHP CS Fixer

Author: picodexter

.travis.yml

@@ -11,6 +11,8 @@ php:
 env:
   global:
     - COVERALLS_EXECUTION_PHP_VERSION="7.1"
+    - PHP_CS_FIXER_COMMIT_RANGE="${TRAVIS_COMMIT_RANGE}"
+    - PHP_CS_FIXER_EXECUTION_PHP_VERSION="7.1"
 
 matrix:
   fast_finish: true
@@ -43,6 +45,8 @@ script:
   - if [[ $(phpenv version-name) == "$COVERALLS_EXECUTION_PHP_VERSION" ]]; then mkdir -p build/logs/; fi
   - if [[ $(phpenv version-name) == "$COVERALLS_EXECUTION_PHP_VERSION" ]]; then ./vendor/bin/phpunit -v --coverage-text --coverage-clover build/logs/clover.xml; fi
   - if [[ $(phpenv version-name) != "$COVERALLS_EXECUTION_PHP_VERSION" ]]; then ./vendor/bin/phpunit -v --coverage-text; fi
+  - if [[ $(phpenv version-name) == "$PHP_CS_FIXER_EXECUTION_PHP_VERSION" ]]; then IFS=$'\n'; COMMIT_SCA_FILES=($(git diff --name-only --diff-filter=ACMRTUXB "${PHP_CS_FIXER_COMMIT_RANGE}")); unset IFS; fi
+  - if [[ $(phpenv version-name) == "$PHP_CS_FIXER_EXECUTION_PHP_VERSION" ]]; then ./vendor/bin/php-cs-fixer fix --config=.php_cs.dist -v --dry-run --stop-on-violation --using-cache=no --path-mode=intersection -- "${COMMIT_SCA_FILES[@]}"; fi
 
 after_script:
   - if [[ $(phpenv version-name) == "$COVERALLS_EXECUTION_PHP_VERSION" ]]; then ./vendor/bin/coveralls -v; fi