joplin/packages/app-desktop/gui/NoteEditor/utils/useMarkupToHtml.ts

import { PluginStates } from '@joplin/lib/services/plugins/reducer';
import { useCallback, useMemo } from 'react';
import { ResourceInfos } from './types';
import markupLanguageUtils from '../../../utils/markupLanguageUtils';
import Setting from '@joplin/lib/models/Setting';

const { themeStyle } = require('@joplin/lib/theme');
import Note from '@joplin/lib/models/Note';

interface HookDependencies {
	themeId: number;
	customCss: string;
	plugins: PluginStates;
}

interface MarkupToHtmlOptions {
	replaceResourceInternalToExternalLinks?: boolean;
	resourceInfos?: ResourceInfos;
}

export default function useMarkupToHtml(deps: HookDependencies) {
	const { themeId, customCss, plugins } = deps;

	const markupToHtml = useMemo(() => {
		return markupLanguageUtils.newMarkupToHtml(deps.plugins, {
			resourceBaseUrl: `file://${Setting.value('resourceDir')}/`,
		});
	}, [plugins]);

	return useCallback(async (markupLanguage: number, md: string, options: MarkupToHtmlOptions = null): Promise<any> => {
		options = {
			replaceResourceInternalToExternalLinks: false,
			resourceInfos: {},
			...options,
		};

		md = md || '';

		const theme = themeStyle(themeId);
		let resources = {};

		if (options.replaceResourceInternalToExternalLinks) {
			md = await Note.replaceResourceInternalToExternalLinks(md, { useAbsolutePaths: true });
		} else {
			resources = options.resourceInfos;
		}

		delete options.replaceResourceInternalToExternalLinks;

		const result = await markupToHtml.render(markupLanguage, md, theme, Object.assign({}, {
			codeTheme: theme.codeThemeCss,
			userCss: customCss || '',
			resources: resources,
			postMessageSyntax: 'ipcProxySendToHost',
			splitted: true,
			externalAssetsOnly: true,
		}, options));

		return result;
	}, [themeId, customCss, markupToHtml]);
}