COMOPS-129: Extract SVC code into its own repo

Author: lenaorobei

Diff for: .gitignore

@@ -0,0 +1,2 @@
+/vendor
+/.idea

Diff for: README.md

@@ -1 +1,20 @@
-# magento-semver
+# Magento Semantic Version Checker
+
+## Installation
+
+- `git clone [email protected]:magento/magento-semver.git`
+- `cd magento-semver`
+- `composer install`
+
+*Note:* package `magento/framework` is hosted on `repo.magento.com`, so Composer keys need to be added to `auth.json` or configured globally.
+*ToDo:* get rid of this dependency.
+
+## Usage
+- `php bin/svc --help`
+
+### Commands
+- `php bin/svc compare` - Compare a set of files to determine what semantic versioning change needs to be done.
+- `php bin/svc update-breaking-changes` - Update the file with a list of backward incompatible changes between two sources.
+
+## Tests
+- `vendor/bin/phpunit -c tests/Unit/phpunit.xml.dist`

Diff for: auth.json.sample

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+{
+    "http-basic": {
+        "repo.magento.com": {
+            "username": "<public-key>",
+            "password": "<private-key>"
+        }
+    }
+}

Diff for: bin/svc

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+#!/usr/bin/env php
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+require __DIR__ . '/../vendor/autoload.php';
+
+use Symfony\Component\Console\Application;
+use Magento\SemanticVersionChecker\Console\Command\BackwardIncompatibleChangesCommand;
+use Magento\SemanticVersionChecker\Console\Command\CompareSourceCommand;
+
+if (PHP_SAPI !== 'cli') {
+    echo 'Command "bin/svc" must be run as a CLI application.' . PHP_EOL;
+    exit(1);
+}
+
+try {
+    $application = new Application();
+    $application->add(new BackwardIncompatibleChangesCommand());
+    $application->add(new CompareSourceCommand());
+    $application->run();
+} catch (\Exception $e) {
+    while ($e) {
+        echo $e->getMessage();
+        echo $e->getTraceAsString();
+        echo "\n\n";
+        $e = $e->getPrevious();
+    }
+    exit(1);
+}

Diff for: composer.json

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+{
+    "name": "magento/magento-semver",
+    "description": "Magento semantic version checker",
+    "version": "1.0.0",
+    "license": [
+        "OSL-3.0",
+        "AFL-3.0"
+    ],
+    "require": {
+        "php": "~7.1.3||~7.2.0",
+        "tomzx/php-semver-checker": "^0.13.0",
+        "symfony/console": "~4.1.0",
+        "nikic/php-parser": "^3.1.0",
+        "magento/framework": "~102.0.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^6.5.0",
+        "allure-framework/allure-phpunit": "^1.2.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "Magento\\SemanticVersionChecker\\": "src/"
+        }
+    },
+    "repositories": [
+        {
+            "type": "composer",
+            "url": "https://repo.magento.com/"
+        }
+    ]
+}