From ed35abf4d2f8fb26533823d0cc4938d626aa5c27 Mon Sep 17 00:00:00 2001
From: Michael Ochmann <michael.ochmann@propeller.de>
Date: Fri, 30 Sep 2022 19:52:20 +0200
Subject: [PATCH] added support for metadata and corresponding title slide

---
 src/Parser.js                     | 57 +++++++++++++++++++++++++++++--
 src/ui/src/assets/css/_slide.scss | 13 +++++++
 2 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/src/Parser.js b/src/Parser.js
index 88c89cb..0e28076 100644
--- a/src/Parser.js
+++ b/src/Parser.js
@@ -3,9 +3,11 @@
 const {lexer} = require("marked");
 
 class Slide {
+	title;
 	content;
 
 	constructor(content = []) {
+		this.title   = false;
 		this.content = content;
 	}
 
@@ -18,17 +20,68 @@ const tokenize = string => {
 	return lexer(string);
 };
 
+const injectTitle = (deck, meta) => {
+	const title = [];
+
+	if (meta.title)
+		title.push({
+			type   : "heading",
+			level  : 1,
+			tokens : [
+				{
+					type : "text",
+					text : meta.title
+				}
+			]
+		});
+	if (meta.author)
+		title.push({
+			type   : "paragraph",
+			tokens : [
+				{
+					type : "text",
+					text : `–  ${meta.author}`
+				},
+			]
+		});
+	if (meta.email)
+		title.push({
+			type   : "paragraph",
+			tokens : [
+				{
+					type : "text",
+					text : `<${meta.email}>`
+				},
+			]
+		});
+	const slide = new Slide(title);
+	slide.title = true;
+	deck.unshift(slide);
+
+	return deck;
+}
+
 const parser = string => {
 	const tokenStream  = tokenize(string);
 	const slideDeck    = [];
 	let   currentSlide = new Slide();
+	let   metaData     = null;
 
 	for (const token of tokenStream) {
-		if ( token.type === "space" || token.type === "heading" && token.depth === 1) {
+		if ( token.type === "space" || (token.type === "heading" && token.depth === 1) || token.type === "html") {
 			if (currentSlide.content.length > 0) {
 				slideDeck.push(currentSlide);
 				currentSlide = new Slide();
 			}
+			if (!metaData && token.type === "html" && token.text.charAt(2) === '-') {
+				const metaString = token.text.replace(/(<!--|-->)/gi, "");
+				const meta       = {};
+				for (const attribute of metaString.split(';')) {
+					const [key, value] = attribute.split(':');
+					meta[key.trim()] = value.trim();
+				}
+				metaData = meta;
+			}
 
 			if (token.type === "heading")
 				slideDeck.push(new Slide([token]));
@@ -39,7 +92,7 @@ const parser = string => {
 	if (currentSlide.content.length > 0)
 		slideDeck.push(currentSlide);
 
-	return slideDeck;
+	return injectTitle(slideDeck, metaData);
 };
 
 module.exports = {
diff --git a/src/ui/src/assets/css/_slide.scss b/src/ui/src/assets/css/_slide.scss
index 5f22418..1500252 100644
--- a/src/ui/src/assets/css/_slide.scss
+++ b/src/ui/src/assets/css/_slide.scss
@@ -2,6 +2,7 @@
 	font-family: "Iosevka", sans-serif;
 	font-size: 2rem;
 	display: flex;
+	flex-direction: column;
 	align-items: center;
 	justify-content: center;
 	user-select: none;
@@ -9,6 +10,18 @@
 	background: color(background);
 	color: color(foreground);
 
+	&.title {
+		p {
+			font-style: italic;
+			font-size: 1.8rem;
+			color: color(scrollbar);
+		
+			&:nth-of-type(2) {
+				font-size: 1.2rem;
+			}
+		}
+	}
+
 	h1 {
 		font-size: 4rem;
 	}