Initial release of Link Heading Plugin

LICENSE

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+MIT License
+
+Copyright (c) 2026 Jens Mohr
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Link Heading Plugin
+
+A simple plugin for DokuWiki that creates clickable headings linking to
+internal DokuWiki pages.
+
+## Syntax
+
+By default, an H2 heading is created:
+
+    {{linkheading>TARGET|HEADING}}
+
+Example:
+
+    {{linkheading>oeffentlicheauslobung|Eine Überlegung zu Smart Glasses}}
+
+The heading level can be selected with a number from 1 to 6:
+
+    {{linkheading>LEVEL|TARGET|HEADING}}
+
+Example using H4:
+
+    {{linkheading>4|oeffentlicheauslobung|Eine Überlegung zu Smart Glasses}}
+
+Levels:
+
+- 1 = H1
+- 2 = H2
+- 3 = H3
+- 4 = H4
+- 5 = H5
+- 6 = H6
+
+If no level is specified, H2 is used.
+
+## Namespaces
+
+The target is handled as an internal DokuWiki link. DokuWiki namespaces
+can therefore be used as usual:
+
+    {{linkheading>3|datenschutz:oeffentlicheauslobung|Öffentliche Auslobung}}
+
+## Author
+
+Jens Mohr
+
+## License
+
+MIT License
+
+Copyright (c) 2026 Jens Mohr
+
+See the `LICENSE` file for the full license text.

plugin.info.txt

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+base   linkheading
+author Jens Mohr
+date   2026-08-30
+name   Link Heading Plugin
+desc   Creates clickable headings linking to internal DokuWiki pages

syntax.php

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+<?php
+
+/**
+ * DokuWiki Plugin linkheading (Syntax Component)
+ *
+ * Creates clickable headings linking to internal DokuWiki pages.
+ *
+ * @license MIT
+ * @author Jens Mohr
+ */
+
+use dokuwiki\Extension\SyntaxPlugin;
+
+class syntax_plugin_linkheading extends SyntaxPlugin
+{
+    /**
+     * @return string Syntax mode type
+     */
+    public function getType()
+    {
+        return 'substition';
+    }
+
+    /**
+     * @return string Paragraph type
+     */
+    public function getPType()
+    {
+        return 'block';
+    }
+
+    /**
+     * @return int Sort order
+     */
+    public function getSort()
+    {
+        return 155;
+    }
+
+    /**
+     * Connect syntax pattern to lexer.
+     *
+     * @param string $mode Parser mode
+     */
+    public function connectTo($mode)
+    {
+        $this->Lexer->addSpecialPattern(
+            '\{\{linkheading>[^}]+\}\}',
+            $mode,
+            'plugin_linkheading'
+        );
+    }
+
+    /**
+     * Parse plugin syntax.
+     *
+     * Supported forms:
+     *
+     * {{linkheading>target|Heading}}
+     * {{linkheading>4|target|Heading}}
+     *
+     * @inheritDoc
+     */
+    public function handle($match, $state, $pos, Doku_Handler $handler)
+    {
+        $content = substr($match, 14, -2);
+        $parts = explode('|', $content);
+
+        if (
+            count($parts) >= 3 &&
+            preg_match('/^[1-6]$/', trim($parts[0]))
+        ) {
+            $level  = (int) trim(array_shift($parts));
+            $target = trim(array_shift($parts));
+            $title  = trim(implode('|', $parts));
+        } else {
+            $level  = 2;
+            $target = trim(array_shift($parts));
+            $title  = trim(implode('|', $parts));
+        }
+
+        if ($title === '') {
+            $title = $target;
+        }
+
+        return [
+            'level'  => $level,
+            'target' => $target,
+            'title'  => $title,
+        ];
+    }
+
+    /**
+     * Render linked heading.
+     *
+     * @inheritDoc
+     */
+    public function render($mode, Doku_Renderer $renderer, $data)
+    {
+        $level  = max(1, min(6, (int) $data['level']));
+        $target = $data['target'];
+        $title  = $data['title'];
+
+        if ($mode === 'xhtml') {
+            $renderer->doc .= '<h' . $level . ' class="linkheading">';
+            $renderer->internallink($target, $title);
+            $renderer->doc .= '</h' . $level . '>';
+
+            return true;
+        }
+
+        if ($mode === 'metadata') {
+            $renderer->internallink($target, $title);
+
+            return true;
+        }
+
+        return false;
+    }
+}