Initial work on script that extracts release notes from ChangeLog file …

…#5550

Co-authored-by: Sebastian Bergmann <sb@sebastian-bergmann.de>
Co-authored-by: Arne Blankerts <Arne@Blankerts.de>
Co-authored-by: Andreas Möller <am@localheinz.com>
Co-authored-by: Sebastian Heuer <sebastian@phpeople.de>
Co-authored-by: Fabian Blechschmidt <blechschmidt@fabian-blechschmidt.de>
Co-authored-by: Frank Sons <frank.sons@code-quality.de>

build/scripts/extract-release-notes.php

@@ -0,0 +1,47 @@
+#!/usr/bin/env php
+<?php declare(strict_types=1);
+if ($argc !== 2) {
+    print $argv[0] . ' <tag>' . PHP_EOL;
+
+    exit(1);
+}
+
+$version       = $argv[1];
+$versionSeries = explode('.', $version)[0] . '.' . explode('.', $version)[1];
+
+$file = __DIR__ . '/../../ChangeLog-' . $versionSeries . '.md';
+
+if (!is_file($file) || !is_readable($file)) {
+    print $file . ' cannot be read' . PHP_EOL;
+
+    exit(1);
+}
+
+$buffer = '';
+$append = false;
+
+foreach (file($file) as $line) {
+    if (str_starts_with($line, '## [' . $version . ']')) {
+        $append = true;
+
+        continue;
+    }
+
+    if ($append && (str_starts_with($line, '## ') || str_starts_with($line, '['))) {
+        break;
+    }
+
+    if ($append) {
+        $buffer .= $line;
+    }
+}
+
+$buffer = trim($buffer);
+
+if ($buffer === '') {
+    print 'Unable to extract release notes' . PHP_EOL;
+
+    exit(1);
+}
+
+print $buffer . PHP_EOL;