Start with PSR-1

.gitattributes

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+/*.* export-ignore
+/tests export-ignore

.gitignore

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+/.phpcs-cache
+/composer.lock
+/phpcs.xml
+/phpunit.xml
+/vendor/

.travis.yml

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+sudo: false
+
+language: php
+
+php:
+    - 7.2
+    - nightly
+
+before_install:
+    - phpenv config-rm xdebug.ini || true
+    - phpenv config-add .travis/php.ini
+
+install:
+    - travis_retry composer install --classmap-authoritative --no-suggest --prefer-dist
+
+script:
+    - vendor/bin/phpunit
+
+jobs:
+    include:
+
+        - stage: Test
+          env: DEPENDENCIES=low
+          php: 7.2
+          install:
+              - travis_retry composer update --classmap-authoritative --no-suggest  --prefer-dist --prefer-lowest --prefer-stable
+
+        - stage: Code Quality
+          env: CODING_STANDARDS
+          script:
+              - vendor/bin/phpcs
+
+allow_failures:
+    - php: nightly
+
+cache:
+    directories:
+        - $HOME/.composer/cache/files
+
+branches:
+    only:
+        - master

.travis/php.ini

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+short_open_tag = On

composer.json

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+{
+    "name": "libero/coding-standard",
+    "description": "Libero PHP coding standard",
+    "type": "phpcodesniffer-standard",
+    "license": "MIT",
+    "autoload-dev": {
+        "psr-4": {
+            "tests\\Libero\\CodingStandard\\": "tests/"
+        }
+    },
+    "require": {
+        "php": "^7.2",
+        "dealerdirect/phpcodesniffer-composer-installer": "^0.4",
+        "squizlabs/php_codesniffer": "^3.3.1"
+    },
+    "require-dev": {
+        "lstrojny/functional-php": "^1.8",
+        "phpunit/phpunit": "^7.3",
+        "symfony/finder": "^4.1"
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.0.x-dev"
+        }
+    }
+}

phpcs.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="vendor/squizlabs/php_codesniffer/phpcs.xsd">
+
+    <arg name="basepath" value="."/>
+    <arg name="cache" value=".phpcs-cache"/>
+    <arg name="colors"/>
+    <arg name="extensions" value="php"/>
+    <arg value="s"/>
+
+    <rule ref="Libero"/>
+
+    <file>src/</file>
+    <file>tests/</file>
+
+    <rule ref="PSR1.Methods.CamelCapsMethodName.NotCamelCaps">
+        <exclude-pattern>*/tests/*</exclude-pattern>
+    </rule>
+
+</ruleset>

phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/7.3/phpunit.xsd" colors="true"
+    bootstrap="vendor/autoload.php">
+
+    <php>
+        <const name="PHP_CODESNIFFER_CBF" value="true"/>
+    </php>
+
+    <testsuites>
+        <testsuite name="Libero Coding Standard">
+            <directory suffix=".php">tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory>src</directory>
+        </whitelist>
+    </filter>
+
+</phpunit>

src/Libero/ruleset.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<ruleset name="Libero" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../vendor/squizlabs/php_codesniffer/phpcs.xsd">
+
+    <description>The Libero coding standard.</description>
+
+    <rule ref="PSR2"/>
+
+</ruleset>

tests/Tests.php

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+<?php
+
+namespace tests\Libero\CodingStandard;
+
+use LogicException;
+use PHP_CodeSniffer\Config;
+use PHP_CodeSniffer\Files\DummyFile;
+use PHP_CodeSniffer\Files\File;
+use PHP_CodeSniffer\Runner;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Finder\Finder;
+use function array_combine;
+use function array_filter;
+use function array_map;
+use function explode;
+use function Functional\flatten;
+use function ini_get;
+use function preg_match_all;
+use function sort;
+use function strpos;
+
+final class Tests extends TestCase
+{
+    /** @var Runner */
+    private static $codeSniffer;
+
+    public static function setUpBeforeClass()
+    {
+        self::$codeSniffer = new Runner();
+        self::$codeSniffer->config = new Config(['--standard=Libero']);
+        self::$codeSniffer->init();
+    }
+
+    /**
+     * @test
+     * @dataProvider cases
+     */
+    public function it_finds_and_fixes_violations(
+        string $filename,
+        string $contents,
+        string $fixed,
+        array $messages,
+        ?string $description
+    ) : void {
+        $file = $this->createFile($filename, $contents);
+        $actual = flatten($this->getMessages($file));
+
+        sort($actual);
+        sort($messages);
+
+        $this->assertSame($messages, $actual, $description);
+        $this->assertSame($fixed, $file->fixer->getContents());
+    }
+
+    public function cases() : iterable
+    {
+        $files = Finder::create()->files()->in(__DIR__.'/cases');
+
+        foreach ($files as $file) {
+            preg_match_all('~(?:---)?([A-Z]+)---\s+([\s\S]+?)\n---~', $file->getContents(), $matches);
+
+            $parts = array_combine(array_map('strtolower', $matches[1]), $matches[2]);
+
+            if (isset($parts['messages'])) {
+                $parts['messages'] = array_filter(explode("\n", $parts['messages']));
+            }
+
+            if (empty($parts['contents'])) {
+                throw new LogicException("Couldn't find contents in {$file->getRelativePathname()}");
+            } elseif (empty($parts['fixed']) && empty($parts['messages'])) {
+                throw new LogicException("Expected one of fixed or messages in {$file->getRelativePathname()}");
+            }
+
+            yield $file->getRelativePathname() => [
+                $parts['filename'] ?? 'test.php',
+                $parts['contents'],
+                $parts['fixed'] ?? $parts['contents'],
+                $parts['messages'] ?? [],
+                $parts['description'] ?? null,
+            ];
+        }
+    }
+
+    private function createFile(string $filename, string $content) : File
+    {
+        if (!ini_get('short_open_tag') && false === strpos($content, '<?php')) {
+            $this->markTestSkipped('short_open_tag option is disabled');
+        }
+
+        $file = new DummyFile(
+            "phpcs_input_file:${filename}\n{$content}",
+            self::$codeSniffer->ruleset,
+            self::$codeSniffer->config
+        );
+
+        $file->process();
+
+        $file->fixer->fixFile();
+
+        $file = new DummyFile(
+            "phpcs_input_file:${filename}\n{$file->fixer->getContents()}",
+            self::$codeSniffer->ruleset,
+            self::$codeSniffer->config
+        );
+
+        $file->process();
+
+        return $file;
+    }
+
+    private function getMessages(File $file) : iterable
+    {
+        foreach ([$file->getErrors(), $file->getWarnings()] as $messages) {
+            foreach ($messages as $line => $lineMessages) {
+                foreach ($lineMessages as $column => $columnMessages) {
+                    foreach ($columnMessages as $data) {
+                        yield "{$line}:{$column} {$data['message']}";
+                    }
+                }
+            }
+        }
+    }
+}

tests/bootstrap.php

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+<?php
+
+namespace tests\Libero\CodingStandard;
+
+require __DIR__.'/../vendor/autoload.php';
+require __DIR__.'/../vendor/squizlabs/php_codesniffer/autoload.php';

tests/cases/classes/case

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+---DESCRIPTION---
+Filename must match class name
+---FILENAME---
+foobar.php
+---CONTENTS---
+<?php
+
+namespace Vendor;
+
+class foobar
+{
+}
+
+---MESSAGES---
+5:1 Class name "foobar" is not in PascalCase format
+---

tests/cases/interfaces/case

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+---DESCRIPTION---
+Filename must match class name
+---FILENAME---
+foobar.php
+---CONTENTS---
+<?php
+
+namespace Vendor;
+
+interface foobar
+{
+}
+
+---MESSAGES---
+5:1 Interface name "foobar" is not in PascalCase format
+---

tests/cases/php/closing-tag

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+---DESCRIPTION---
+No closing PHP tags at the end of files
+---CONTENTS---
+<?php
+
+$foo = 'bar';
+
+?>
+
+---FIXED---
+<?php
+
+$foo = 'bar';
+
+---

tests/cases/php/line-length

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+---DESCRIPTION---
+Lines must not exceed 120 characters
+---CONTENTS---
+<?php
+
+$foo = '890123456789001234567890012345678900123456789001234567890012345678900123456789001234567890012345678900123456789';
+
+---MESSAGES---
+3:121 Line exceeds 120 characters; contains 121 characters
+---

tests/cases/php/short-tag

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+---DESCRIPTION---
+PHP short tags are not allowed
+---CONTENTS---
+<?
+
+$foo = 'bar';
+
+---FIXED---
+<?php
+
+$foo = 'bar';
+
+---

tests/cases/php/side-effects

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+---DESCRIPTION---
+No closing PHP tags at the end of files
+---CONTENTS---
+<?php
+
+$foo = 'bar';
+
+?>
+
+---FIXED---
+<?php
+
+$foo = 'bar';
+
+---

tests/cases/trait/case

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+---DESCRIPTION---
+Filename must match class name
+---FILENAME---
+foobar.php
+---CONTENTS---
+<?php
+
+namespace Vendor;
+
+trait foobar
+{
+}
+
+---MESSAGES---
+5:1 Trait name "foobar" is not in PascalCase format
+---