show open merge requests

controllers/mergerequests.php

+<?php
+final class MergerequestsController extends TracToGitlab\GitlabController
+{
+    public function before_filter(&$action, &$args)
+    {
+        parent::before_filter($action, $args);
+
+        PageLayout::setTitle(_('Merge Requests'));
+        $this->activateNavigation('merge-requests');
+    }
+
+    public function index_action()
+    {
+        $data = $this->readFromCache('merge-requests', true);
+        if ($data === false) {
+            $this->issues = $this->fetchIssues();
+            $this->writeToCache('merge-requests', $this->issues);
+        } else {
+            $this->issues = $data['data'];
+
+            Sidebar::get()->addWidget(new TemplateWidget(
+                'Aus dem Cache',
+                $this->get_template_factory()->open(
+                    $this->get_default_template('sidebar')
+                ),
+                ['time' => time()]
+            ));
+        }
+    }
+
+    public function diff_action($mr_iid)
+    {
+//        $versions = $this->gitlab->mergeRequests()->
+    }
+
+    private function fetchIssues(): array
+    {
+        $issues = $this->gitlabPager->fetchAll(
+            $this->gitlab->issues(),
+            'all',
+            [
+                $this->gitlabProjectId,
+                [
+                    'sort'      => 'asc',
+                    'scope'     => 'all',
+                    'milestone' => 'None',
+                    'labels'    => 'BIEST',
+                    'state'     => 'closed',
+                ]
+            ]
+        );
+
+        $issues = array_filter($issues, function ($issue) {
+            if ($issue['confidential']) {
+                return false;
+            }
+
+            foreach (['worksforme', 'wontfix', 'Duplicate', 'invalid'] as $label) {
+                if (in_array($label, $issue['labels'])) {
+                    return false;
+                }
+            }
+
+            $has_version = array_reduce($issue['labels'], function ($has_version, $label) {
+                return $has_version || strpos($label, 'Version::') === 0;
+            }, false);
+            return $has_version;
+        });
+
+        $issues = array_map(function ($issue) {
+            $issue['studip_version'] = $this->extractVersion($issue['labels']);
+            $issue['mr'] = $this->fetchRelatedMergeRequest($issue['iid']);
+            return $issue;
+        }, $issues);
+
+        usort($issues, function ($a, $b) {
+            return strcmp($b['studip_version'], $a['studip_version']);
+        });
+
+        return $issues;
+    }
+
+    private function fetchRelatedMergeRequest(int $issue_id)
+    {
+        $mrs = $this->gitlab->issues()->closedByMergeRequests(
+            $this->gitlabProjectId,
+            $issue_id
+        );
+        foreach ($mrs as $mr) {
+            if ($mr['state'] === 'merged') {
+                return $mr['iid'];
+            }
+        }
+        return null;
+    }
+
+    private function extractVersion(array $labels): string
+    {
+        $version = '';
+        foreach ($labels as $label) {
+            if (strpos($label, 'Version::') === 0) {
+                $v = substr($label, 9);
+                if (!$version || $v < $version) {
+                    $version = $v;
+                }
+            }
+        }
+        return $version;
+    }
+}