Add text-highlights script.

text-highlights/info.json

@@ -0,0 +1,10 @@
+{
+  "name": "Text Highlights",
+  "identifier": "text-highlights",
+  "script": "text-highlights.qml",
+  "authors": ["@mleo2003"],
+  "platforms": ["linux", "macos", "windows"],
+  "version": "0.0.2",
+  "minAppVersion": "17.06.2",
+  "description" : "Provide a way to highlight text in markdown and render it as some other markdown viewers do. Uses ==text== syntax, and the color shown is configurable."
+}

text-highlights/text-highlights.qml

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+import QtQml 2.0
+import QOwnNotesTypes 1.0
+
+QtObject {
+	property string highlightColor;
+	
+	property variant settingsVariables: [
+		{
+			"identifier": "highlightColor",
+			"name": "Highlight Color",
+			"description": "Color to highlight text as",
+			"type": "string",
+			"default": "FFFF00",
+		}
+	];
+
+	function noteToMarkdownHtmlHook(note, html) {
+		var stylesheet = ".highlighted {background-color: #" + highlightColor + ";}";
+		html = html.replace(/==(.+?)==/g, "<span class='highlighted'>$1</span>");
+		html = html.replace("</style>", stylesheet + "</style>");
+		return html;
+	}
+	
+	function init() {
+		script.registerCustomAction("addHighlights", "Add Highlight Marks", "Add Highlights", "text-wrap");
+	}
+	
+	function customActionInvoked(identifier) {
+		switch (identifier) {
+			case "addHighlights":
+				// getting selected text from the note text edit
+				var text = "==" + script.noteTextEditSelectedText() + "==";
+				// put the result to the current cursor position in the note text edit
+				script.noteTextEditWrite(text);
+			break;
+		}
+	}
+}