Setup PHP CS fixer

- Add PHP CS Fixer as a dev dependencies.
- Add PHP CS Fixer cache file to gitignore/gitattributes
- Add custom code style config
- Update TravisCI config to check code style

.gitattributes

@@ -1,11 +1,11 @@
-# Ignore all test and documentation for archive
+# Ignore all test, documentation and dot files for archive
 /tests              export-ignore
 /.editorconfig      export-ignore
 /.gitattributes     export-ignore
 /.gitignore         export-ignore
+/.php_cs.dist       export-ignore
 /.scrutinizer.yml   export-ignore
 /.travis.yml        export-ignore
-/composer.lock      export-ignore
 /CONTRIBUTING.md    export-ignore
 /logo.png           export-ignore
 /phpunit.xml        export-ignore

.gitignore

@@ -1,6 +1,8 @@
+/.idea
+*.iml
+
 /tests/resources/generated
 /tests/coverage
 /vendor
-/.idea
-*.iml
-composer.lock
+/composer.lock
+/.php_cs.cache

.php_cs.dist

@@ -0,0 +1,58 @@
+<?php
+
+$config = PhpCsFixer\Config::create()
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@Symfony' => true,
+        'align_multiline_comment' => false,
+        'array_syntax' => ['syntax' => 'short'],
+        'binary_operator_spaces' => ['align_double_arrow' => true, 'align_equals' => null],
+        'blank_line_before_statement' => ['statements' => ['return']],
+        'combine_consecutive_unsets' => true,
+        'concat_space' => ['spacing' => 'one'],
+        'declare_equal_normalize' => ['space' => 'single'],
+        'heredoc_to_nowdoc' => true,
+        'is_null' => ['use_yoda_style' => false],
+        'method_argument_space' => ['ensure_fully_multiline' => true],
+        'modernize_types_casting' => true,
+        'no_break_comment' => ['comment_text' => 'do nothing'],
+        'no_empty_phpdoc' => false,
+        'no_null_property_initialization' => true,
+        'no_short_echo_tag' => true,
+        'no_superfluous_elseif' => true,
+        'no_unneeded_control_parentheses' => ['statements' => ['break', 'clone', 'continue', 'echo_print', 'switch_case', 'yield']],
+        'no_unneeded_curly_braces' => true,
+        'no_unneeded_final_method' => true,
+        'no_useless_else' => false,
+        'no_useless_return' => true,
+        'ordered_imports' => true,
+        'phpdoc_add_missing_param_annotation' => true,
+        'phpdoc_align' => false,
+        'phpdoc_annotation_without_dot' => false,
+        'phpdoc_no_empty_return' => false,
+        'phpdoc_order' => true,
+        'phpdoc_summary' => false,
+        'phpdoc_types_order' => ['null_adjustment' => 'always_last', 'sort_algorithm' => 'none'],
+        'phpdoc_separation' => false,
+        'pre_increment' => false,
+        'protected_to_private' => true,
+        'psr4' => true,
+        'return_type_declaration' => ['space_before' => 'one'],
+        'semicolon_after_instruction' => true,
+        'simplified_null_return' => false,
+        'single_line_comment_style' => ['comment_types' => ['hash']],
+        'strict_comparison' => true,
+        'void_return' => true,
+    ]);
+
+$config->setFinder(
+    PhpCsFixer\Finder::create()
+        ->exclude('vendor')
+        ->in(__DIR__)
+        ->name('*.php')
+);
+
+$cacheDir = getenv('TRAVIS') ? getenv('HOME') . '/.php-cs-fixer' : __DIR__;
+$config->setCacheFile($cacheDir . '/.php_cs.cache');
+
+return $config;

.travis.yml

@@ -1,27 +1,60 @@
+dist: trusty
+sudo: false
+
 language: php
 
-dist: trusty
-
-php:
-  - 5.6
-  - 7.0
-  - 7.1
-  - hhvm-3.6
+matrix:
+  include:
+    - php: 5.6
+      env: WITH_PHPUNIT=true
+    - php: 5.6
+      env: WITH_CS=true
+    - php: 7.0
+      env: WITH_PHPUNIT=true
+    - php: 7.1
+      env: WITH_PHPUNIT=true WITH_COVERAGE=true
+    - php: hhvm-3.6
+      env: WITH_PHPUNIT=true
 
 cache:
   directories:
     - $HOME/.composer/cache
+    - $HOME/.php-cs-fixer
+
+before_install:
+  - |
+    if [[ "$WITH_COVERAGE" != "true" ]]; then
+        phpenv config-rm xdebug.ini
+    fi
+    if [[ "$WITH_CS" != "true" ]]; then
+        composer remove friendsofphp/php-cs-fixer --dev --no-update
+    fi
+  - composer validate
 
 install:
   - composer install --no-interaction --prefer-source
 
-script:
+before_script:
+  - mkdir -p "$HOME/.php-cs-fixer"
   - mkdir -p build/logs
-  - php vendor/bin/phpunit --coverage-clover=build/logs/coverage.clover
+
+script:
+  - |
+    if [[ "$WITH_CS" == "true" ]]; then
+        vendor/bin/php-cs-fixer fix --config=.php_cs.dist --verbose --diff --dry-run
+    fi
+  - |
+    if [[ "$WITH_PHPUNIT" == "true" ]]; then
+        if [[ "$WITH_COVERAGE" == "true" ]]; then
+            vendor/bin/phpunit --coverage-clover=build/logs/coverage.clover
+        else
+            vendor/bin/phpunit --no-coverage
+        fi
+    fi
 
 after_script:
   - |
-    if [[ "$TRAVIS_PHP_VERSION" = '7.1' ]]; then
+    if [[ "$WITH_COVERAGE" == "true" ]]; then
       wget https://scrutinizer-ci.com/ocular.phar
       php ocular.phar code-coverage:upload --format=php-clover build/logs/coverage.clover
     fi

composer.json

@@ -17,7 +17,8 @@
         "ext-xmlreader" : "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7.0"
+        "phpunit/phpunit": "^5.7.0",
+        "friendsofphp/php-cs-fixer": "^2.5.0"
     },
     "suggest": {
         "ext-iconv": "To handle non UTF-8 CSV files (if \"php-intl\" is not already installed or is too limited)",