From 9e4aed84f82483103df2c6a2f40d06d97bfe7a4f Mon Sep 17 00:00:00 2001
From: Phablulo <phablulo@gmail.com>
Date: Sun, 16 Jan 2022 16:24:56 -0300
Subject: [PATCH] [PLUGIN][LatexNotes] add LaTeX support for notes

---
 plugins/LatexNotes/LatexNotes.php | 60 +++++++++++++++++++++++++++++++
 plugins/LatexNotes/composer.json  |  5 +++
 2 files changed, 65 insertions(+)
 create mode 100644 plugins/LatexNotes/LatexNotes.php
 create mode 100644 plugins/LatexNotes/composer.json

diff --git a/plugins/LatexNotes/LatexNotes.php b/plugins/LatexNotes/LatexNotes.php
new file mode 100644
index 0000000000..ddbe7f333a
--- /dev/null
+++ b/plugins/LatexNotes/LatexNotes.php
@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types = 1);
+
+// {{{ License
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU social is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
+// }}}
+/**
+ * LaTeX note support for GNU social
+ *
+ * @package   GNUsocial
+ * @category  Plugin
+ *
+ * @author    Phablulo <phablulo@gmail.com>
+ * @copyright 2018-2019, 2021 Free Software Foundation, Inc http://www.fsf.org
+ * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
+ */
+
+namespace Plugin\LatexNotes;
+
+use App\Core\Event;
+use App\Core\Modules\Plugin;
+use PhpLatex_Parser;
+use PhpLatex_Renderer_Html;
+
+class LatexNotes extends Plugin
+{
+    public function onPostingAvailableContentTypes(array &$types): bool
+    {
+        $types['LaTeX'] = 'application/x-latex';
+        return Event::next;
+    }
+    public function onRenderNoteContent($content, $content_type, &$rendered): bool
+    {
+        if ($content_type !== 'application/x-latex') {
+            return Event::next;
+        }
+        // https://github.com/xemlock/php-latex
+        $parser     = new PhpLatex_Parser();
+        $parsedTree = $parser->parse($content);
+
+        $htmlRenderer = new PhpLatex_Renderer_Html();
+        $rendered     = $htmlRenderer->render($parsedTree);
+
+        return Event::stop;
+    }
+}
diff --git a/plugins/LatexNotes/composer.json b/plugins/LatexNotes/composer.json
new file mode 100644
index 0000000000..7d11d94567
--- /dev/null
+++ b/plugins/LatexNotes/composer.json
@@ -0,0 +1,5 @@
+{
+  "require": {
+    "xemlock/php-latex": "dev-master"
+  }
+}