feat: Initial clean release of CHM

packages/tools/website/utils/openGraph.ts

@@ -0,0 +1,45 @@
+import { MarkupLanguage, MarkupToHtml } from '@joplin/renderer';
+import { readmeFileTitleAndBody, replaceGitHubByWebsiteLinks } from './parser';
+import markupLanguageUtils from '@joplin/lib/markupLanguageUtils';
+import { substrWithEllipsis } from '@joplin/lib/string-utils';
+
+export interface OpenGraphTags {
+	title: string;
+	description: string;
+	url: string;
+	image?: string;
+}
+
+let markupToHtml_: MarkupToHtml = null;
+
+const markupToHtml = (): MarkupToHtml => {
+	if (!markupToHtml_) markupToHtml_ = new MarkupToHtml();
+	return markupToHtml_;
+};
+
+const getImageUrl = (content: string): string | null => {
+	const imageUrls = markupLanguageUtils.extractImageUrls(MarkupLanguage.Any, content);
+	if (!imageUrls.length) return null;
+	let imageUrl = replaceGitHubByWebsiteLinks(imageUrls[0]);
+	if (!imageUrl.startsWith('https:')) {
+		if (!imageUrl.startsWith('/')) imageUrl = `/${imageUrl}`;
+		imageUrl = `https://joplinapp.org${imageUrl}`;
+	}
+	return imageUrl;
+};
+
+export const extractOpenGraphTags = async (sourcePath: string, url?: string): Promise<OpenGraphTags> => {
+	const doc = await readmeFileTitleAndBody(sourcePath);
+
+	const output: OpenGraphTags = {
+		title: substrWithEllipsis(doc.title, 0, 70),
+		description: substrWithEllipsis(markupToHtml().stripMarkup(MarkupLanguage.Markdown, doc.body), 0, 200),
+		url: url ? url : '',
+	};
+
+	const imageUrl = getImageUrl(doc.body);
+
+	if (imageUrl) output.image = imageUrl;
+
+	return output;
+};