added several checks for common version number mistakes

bin/release.php

@@ -1,3 +1,4 @@
+#!/usr/bin/env php
 <?php
 
 /*
@@ -12,11 +13,64 @@
 require_once __DIR__.'/../vendor/autoload.php';
 
 if (!isset($argv[1])) {
-    throw new \InvalidArgumentException('You must provide version.');
+    throw new \InvalidArgumentException('You must specify the version: v1.x.x or next.');
 }
 
 $version = $argv[1];
 
-echo sprintf("Releasing symfony version \"%s\".\n", $version);
+exec('git tag -l', $tags, $resultCode);
+
+if ($resultCode > 0 || count($tags) === 0) {
+    throw new \RuntimeException('Reading tag failed.');
+}
+
+$latestVersionNumber = $tags[0];
+foreach ($tags as $tag) {
+    if (version_compare($latestVersionNumber, $tag) < 0) {
+        $latestVersionNumber = $tag;
+    }
+}
+
+if ($version !== 'next') {
+    if (!preg_match('/^v1\.([5-9]|\d{2,})\.\d+$/', $version)) {
+        throw new \InvalidArgumentException(sprintf('The format of the specified version number is incorrect: "%s"', $version));
+    }
+
+    if (in_array($version, $tags)) {
+        throw new \InvalidArgumentException(sprintf('The specified version number already exists: "%s"', $version));
+    }
+
+    [$latestMajorPart, $latestMinorPart, $latestPatchPart] = explode('.', $latestVersionNumber);
+    [$versionMajorPart, $versionMinorPart, $versionPatchPart] = explode('.', $version);
+
+    // This cannot be due to regexp. Just double check.
+    if ($latestMajorPart !== $versionMajorPart) {
+        throw new \InvalidArgumentException(sprintf('The specified version number can\'t change major: "%s"', $version));
+    }
+
+    // changed minor or patch
+    if ($latestMinorPart !== $versionMinorPart) {
+        if ($versionPatchPart !== '0') {
+            throw new \InvalidArgumentException(sprintf('The specified version number should be: "%s.%s.0"', $versionMajorPart, $versionMinorPart));
+        }
+    } elseif ($latestPatchPart !== $versionPatchPart) {
+        $latestPatchPartInt = (int) $latestPatchPart;
+        $versionPatchPartInt = (int) $versionPatchPart;
+
+        $nextPatchPartInt = $latestPatchPartInt+1;
+
+        if ($nextPatchPartInt !== $versionPatchPartInt) {
+            throw new \InvalidArgumentException(sprintf('Don\'t skip patch version. The specified version number should be: "%s.%s.%d"', $versionMajorPart, $versionMinorPart, $nextPatchPartInt));
+        }
+    }
+} else {
+    [$latestMajorPart, $latestMinorPart, $latestPatchPart] = explode('.', $latestVersionNumber);
+    $nextPatchPart = (int) $latestPatchPart + 1;
+    $version = sprintf('%s.%s.%d', $latestMajorPart, $latestMinorPart, $nextPatchPart);
+}
+
+$rawVersion = substr($version, 1);
+
+echo sprintf("Prepare symfony version \"%s\".\n", $rawVersion);
 
 exit(0);