Mobile: Plugin API: Add support for the renderMarkup command (#11494)

packages/lib/commands/renderMarkup.ts

@@ -0,0 +1,33 @@
+import markupLanguageUtils from '../markupLanguageUtils';
+import Setting from '../models/Setting';
+import { CommandRuntime, CommandDeclaration, CommandContext } from '../services/CommandService';
+import { themeStyle } from '../theme';
+import attachedResources from '../utils/attachedResources';
+import { MarkupLanguage } from '@joplin/renderer';
+import { Options } from '@joplin/renderer/MdToHtml';
+import { RenderOptions } from '@joplin/renderer/types';
+
+export const declaration: CommandDeclaration = {
+	name: 'renderMarkup',
+};
+
+const getMarkupToHtml = () => {
+	return markupLanguageUtils.newMarkupToHtml({}, {
+		resourceBaseUrl: `file://${Setting.value('resourceDir')}/`,
+		customCss: '',
+	});
+};
+
+export const runtime = (): CommandRuntime => {
+	return {
+		execute: async (_context: CommandContext, markupLanguage: MarkupLanguage, markup: string, _rendererOptions: Options = null, renderOptions: RenderOptions = null) => {
+			const markupToHtml = getMarkupToHtml();
+			const html = await markupToHtml.render(markupLanguage, markup, themeStyle(Setting.value('theme')), {
+				...renderOptions,
+				resources: await attachedResources(markup),
+				splitted: true,
+			});
+			return html;
+		},
+	};
+};