Resolve "Suchfunktion Wiki"

Closes #4126

Merge request studip/studip!2972

app/controllers/course/wiki.php

@@ -976,6 +976,30 @@ class Course_WikiController extends AuthenticatedController
         Sidebar::Get()->addWidget($search);
     }
 
+    public function searchpage_action(WikiPage $page)
+    {
+        if (!$page->isReadable()) {
+            throw new AccessDeniedException();
+        }
+        Navigation::activateItem('/course/wiki/allpages');
+        if (!Request::get('search')) {
+            throw new Exception('No search text.');
+        }
+        $search = str_replace(['\\', '_', '%'], ['\\\\', '\\_', '\\%'], Request::get('search'));
+        $this->versions = WikiVersion::findBySQL("`page_id` = :page_id AND (`wiki_versions`.`content` LIKE :searchterm OR `wiki_versions`.`name` LIKE :searchterm) ORDER BY `mkdate` DESC ", [
+            'page_id' => $page->id,
+            'searchterm' => '%' . $search . '%'
+        ]);
+
+        $search = new SearchWidget($this->searchURL());
+        $search->addNeedle(
+            _('Im Wiki suchen'),
+            'search',
+            true
+        );
+        Sidebar::Get()->addWidget($search);
+    }
+
     public function pdf_action(WikiPage $page)
     {
         if (!$page->isReadable()) {
@@ -1217,4 +1241,41 @@ class Course_WikiController extends AuthenticatedController
 
         return $from_end ? mb_strlen($str0) - $length : $length;
     }
+
+    public function findTextualHits($text, $search, $length = 80)
+    {
+        $content = Studip\Markup::removeHtml($text);
+        $offset  = 0;
+        $output  = [];
+
+        // find all occurences
+        while ($offset < mb_strlen($content)) {
+            $pos = mb_stripos($content, Request::get('search'), $offset);
+            if ($pos === false) {
+                break;
+            }
+            $offset = $pos + 1;
+
+            // show max 200 chars
+            $fragment       = '';
+            $split_fragment = preg_split(
+                '/(' . preg_quote(Request::get('search'), '/') . ')/i',
+                mb_substr($content, max(0, $pos - floor($length / 2)), $length),
+                -1,
+                PREG_SPLIT_DELIM_CAPTURE
+            );
+            for ($i = 0; $i < count($split_fragment); ++$i) {
+                if ($i % 2) {
+                    $fragment .= '<span class="wiki_highlight">';
+                    $fragment .= htmlready($split_fragment[$i], false);
+                    $fragment .= '</span>';
+                } else {
+                    $fragment .= htmlready($split_fragment[$i], false);
+                }
+            }
+            $found_in_fragment = (count($split_fragment) - 1) / 2; // number of hits in fragment
+            $output[]          = '...' . $fragment . '...';
+        }
+        return implode('<br>', $output);
+    }
 }

app/views/course/wiki/search.php

@@ -10,7 +10,7 @@
 
     <table class="default">
         <caption>
-            <?= sprintf(_('Treffer für Suche nach <em>%s</em> in allen Versionen'), htmlReady(Request::get('search'))) ?>
+            <?= sprintf(_('Treffer für Suche nach <em>%s</em>'), htmlReady(Request::get('search'))) ?>
         </caption>
         <thead>
         <tr>
@@ -96,6 +96,20 @@
                     <? endif ?>
                 </td>
             </tr>
+            <? if ($pagedata['is_in_history'] && count($pagedata['versions']) > 1 || ($pagedata['is_in_content'] && count($pagedata['versions']) > 0)) : ?>
+            <tr>
+                <td colspan="3">
+                    <a href="<?= $controller->searchpage($page_id, ['search' => Request::get('search')]) ?>">
+                        <?= Icon::create('add')->asImg(['class' => 'text-bottom']) ?>
+                        <? if (count($pagedata['versions']) === 1) : ?>
+                            <?= _('Weiterer Treffer in einer älteren Version.') ?>
+                        <? else : ?>
+                            <?= sprintf(_('Weitere Treffer in %d älteren Versionen.'), count($pagedata['versions'])) ?>
+                        <? endif ?>
+                    </a>
+                </td>
+            </tr>
+            <? endif ?>
         <? endforeach ?>
         </tbody>
     </table>

app/views/course/wiki/searchpage.php

+<table class="default">
+    <caption>
+        <?= sprintf(_('Treffer für Suche nach <em>%s</em> auf Seite %s'), htmlReady(Request::get('search')), htmlReady($page->name)) ?>
+    </caption>
+    <thead>
+    <tr>
+        <th><?= _('Seite') ?></th>
+        <th><?= _('Treffer') ?></th>
+        <th><?= _('Datum') ?></th>
+    </tr>
+    </thead>
+    <tbody>
+    <? $pos_name = mb_stripos($page->name, Request::get('search')) ?>
+    <? $pos_content = mb_stripos($page->content, Request::get('search')) ?>
+    <? if ($pos_name !== false || $pos_content !== false) : ?>
+        <tr>
+            <td>
+                <a href="<?= $controller->page($page) ?>">
+                    <?= htmlReady($page->name) ?>
+                </a>
+            </td>
+            <td>
+                <?= $controller->findTextualHits($page->content, Request::get('search'), 200) ?>
+            </td>
+            <td>
+                <?= $page->chdate > 0 ? date('d.m.Y H:i:s', $page->chdate) : _('unbekannt') ?>
+                (<?= _('Version').' '.htmlReady($page->versionnumber) ?>)
+            </td>
+        </tr>
+    <? endif ?>
+    <? foreach ($versions as $version) : ?>
+        <tr>
+            <td>
+                <a href="<?= $controller->version($version) ?>">
+                    <?= htmlReady($version->name) ?>
+                </a>
+            </td>
+            <td>
+                <?= $controller->findTextualHits($version->content, Request::get('search'), 200) ?>
+            </td>
+            <td>
+                <?= $version->mkdate > 0 ? date('d.m.Y H:i:s', $version->mkdate) : _('unbekannt') ?>
+                (<?= _('Version').' '.htmlReady($version->versionnumber) ?>)
+            </td>
+        </tr>
+    <? endforeach ?>
+    </tbody>
+</table>