qownnotes-mermaid-dark.qml: Fork of QOwnNotes' Mermaid script for dark theme

README.md

@@ -13,6 +13,7 @@ Scripts
   * [dump_mysql.sh](https://forge.tourmentine.com/n/scripts/src/main/dump_mysql.sh) => dump all mysql databases (and send a report to the monitoring system)
   * [dump_postgresql.sh](https://forge.tourmentine.com/n/scripts/src/main/dump_postgresql.sh) => dump all Postgres databases (and send a report to the monitoring system). based on [dump_mysql.sh](https://forge.tourmentine.com/n/scripts/src/main/dump_mysql.sh).
   * [opdsupdates.py](https://forge.tourmentine.com/n/scripts/src/main/opdsupdates.py) => look for OPDS catalog updates and send a mail if any
+  * [qownnotes-mermaid-dark.qml](https://forge.tourmentine.com/n/scripts/src/main/qownnotes-mermaid-dark.qml) => Fork of QOwnNotes' [Mermaid script](https://github.com/qownnotes/scripts/tree/master/mermaid) for dark theme
   * [randomwallpaper.sh](https://forge.tourmentine.com/n/scripts/src/main/randomwallpaper.sh) => display a random wallpaper
   * [secupdate](https://forge.tourmentine.com/n/scripts/src/main/secupdate) => apply security updates & recompile kernel (FreeBSD)
   * [superscreen](https://forge.tourmentine.com/n/scripts/src/main/superscreen) => open multiple ssh sessions to a bunch of servers inside a screen

qownnotes-mermaid-dark.qml

@@ -0,0 +1,29 @@
+import QtQml 2.0
+import QOwnNotesTypes 1.0
+
+QtObject {
+    /**
+    * This function is called before the markdown html of a note is generated
+    *
+    * It allows you to modify what is passed to the markdown to html converter
+    *
+    * The method can for example be used in multiple scripts to render code (like LaTeX math or mermaid)
+    * to its graphical representation for the preview
+    *
+    * The note will not be changed in this process
+    *
+    * @param {NoteApi} note - the note object
+    * @param {string} markdown - the markdown that is about to being converted to html
+    * @param {string} forExport - true if the html is used for an export, false for the preview
+    * @return {string} the modified markdown or an empty string if nothing should be modified
+    */
+    function preNoteToMarkdownHtmlHook(note, markdown, forExport) {
+        var re = /```mermaid\n([\s\S]*?)\n```/gim;
+        markdown = markdown.replace(re, function(_, diag){
+            var encodedData = Qt.btoa(diag);
+            var ink = '![](https://mermaid.ink/img/' + encodedData + '?bgColor=!201F1F)';
+            return ink;
+        });
+        return markdown;
+    }
+}