# All files / src/Site template.ts

31.18% Statements 29/93
13.33% Branches 2/15
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     import fs from 'fs-extra';
    import path from 'path';
    import walkSync from 'walk-sync';
    import * as fsUtil from '../utils/fsUtil';
    import { INDEX_MARKDOWN_FILE, SITE_CONFIG_NAME, _ } from './constants';
    import { SiteConfig, SiteConfigPage } from './SiteConfig';
    import { VariableRenderer } from '../variables/VariableRenderer';
    import * as logger from '../utils/logger';

    const { LAYOUT_DEFAULT_NAME, LAYOUT_FOLDER_PATH } = require('../Layout');

    const requiredFiles = ['index.md', 'site.json', '_markbind/'];

    const PATH_TO_TEMPLATE = '../../template';
    const ABOUT_MARKDOWN_FILE = 'about.md';
    const ABOUT_MARKDOWN_DEFAULT = '# About\n'
      + 'Welcome to your **About Us** page.\n';
    const CONFIG_FOLDER_NAME = '_markbind';
    const SITE_FOLDER_NAME = '_site';
    const WIKI_SITE_NAV_PATH = '_Sidebar.md';
    const WIKI_FOOTER_PATH = '_Footer.md';

    type NaviagablePage = {
      src: string,
      title?: string,
    };

    export class Template {
      rootPath: string;
      templatePath: string;
      siteConfig!: SiteConfig;
      siteConfigPath: string = SITE_CONFIG_NAME;
      navigablePages!: NaviagablePage[];

      constructor(rootPath: string, templatePath: string) {
        this.rootPath = rootPath;
        this.templatePath = path.join(__dirname, PATH_TO_TEMPLATE, templatePath);
      }

      validateTemplateFromPath() {
        for (let i = 0; i < requiredFiles.length; i += 1) {
          const requiredFile = requiredFiles[i];
          const requiredFilePath = path.join(this.templatePath, requiredFile);

          if (!fs.existsSync(requiredFilePath)) {
            return false;
          }
        }

        return true;
      }

      generateSiteWithTemplate() {
        return new Promise((resolve, reject) => {
          fs.access(this.rootPath)
            .catch(() => fs.mkdirSync(this.rootPath))
            .then(() => fsUtil.copySyncWithOptions(this.templatePath, this.rootPath, { overwrite: false }))
            .then(resolve)
            .catch(reject);
        });
      }

      /**
       * A method for initializing a markbind site according to the given template.
       * Generate the site.json and an index.md file.
       */
      async init() {
        if (!this.validateTemplateFromPath()) {
          throw new Error('Template validation failed. Required files does not exist.');
        }

        return new Promise((resolve, reject) => {
          this.generateSiteWithTemplate()
            .then(resolve)
            .catch(reject);
        });
      }

      /**
       * Converts an existing GitHub wiki or docs folder to a MarkBind website.
       */
      async convert() {
        this.siteConfig = await SiteConfig.readSiteConfig(this.rootPath, this.siteConfigPath);
        this.collectNavigablePages();
        await this.addIndexPage();
        await this.addAboutPage();
        this.addDefaultLayoutFiles();
        await this.addDefaultLayoutToSiteConfig();
      }

      getPageGlobPaths(page: SiteConfigPage, pagesExclude: string[]) {
        const pageGlobs = page.glob ?? [];
        return walkSync(this.rootPath, {
          directories: false,
          globs: Array.isArray(pageGlobs) ? pageGlobs : [pageGlobs],
          ignore: [
            CONFIG_FOLDER_NAME,
            SITE_FOLDER_NAME,
            ...pagesExclude.concat(page.globExclude || []),
          ],
        });
      }

      /**
       * Collects the paths to be traversed as navigable pages
       */
      collectNavigablePages() {
        const { pages, pagesExclude } = this.siteConfig;
        const pagesFromGlobs = _.flatMap(pages.filter(page => page.glob),
                                         page => this.getPageGlobPaths(page, pagesExclude)
                                           .map(filePath => ({
                                             src: filePath,
                                             title: page.title,
                                           }))) as NaviagablePage[];

        this.navigablePages = pagesFromGlobs;
      }

      /**
       * Copies over README.md or Home.md to default index.md if present.
       */
      async addIndexPage() {
        const indexPagePath = path.join(this.rootPath, INDEX_MARKDOWN_FILE);
        const fileNames = ['README.md', 'Home.md'];
        const filePath = fileNames.find(fileName => fs.existsSync(path.join(this.rootPath, fileName)));
        // if none of the files exist, do nothing
        Iif (_.isUndefined(filePath)) return;
        try {
          await fs.copy(path.join(this.rootPath, filePath), indexPagePath);
        } catch (error) {
          throw new Error(`Failed to copy over ${filePath}`);
        }
      }

      /**
       * Adds an about page to site if not present.
       */
      async addAboutPage() {
        const aboutPath = path.join(this.rootPath, ABOUT_MARKDOWN_FILE);
        try {
          await fs.access(aboutPath);
        } catch (error) {
          Iif (fs.existsSync(aboutPath)) {
            return;
          }
          await fs.outputFile(aboutPath, ABOUT_MARKDOWN_DEFAULT);
        }
      }

      /**
       * Adds a footer to default layout of site.
       */
      addDefaultLayoutFiles() {
        const wikiFooterPath = path.join(this.rootPath, WIKI_FOOTER_PATH);
        let footer;
        Iif (fs.existsSync(wikiFooterPath)) {
          logger.info(`Copied over the existing ${WIKI_FOOTER_PATH} file to the converted layout`);
          footer = `\n${fs.readFileSync(wikiFooterPath, 'utf8')}`;
        }

        const wikiSiteNavPath = path.join(this.rootPath, WIKI_SITE_NAV_PATH);
        let siteNav;
        if (fs.existsSync(wikiSiteNavPath)) {
          logger.info(`Copied over the existing ${WIKI_SITE_NAV_PATH} file to the converted layout\n`
            + 'Check https://markbind.org/userGuide/tweakingThePageStructure.html#site-navigation-menus\n'
            + 'for information on site navigation menus.');
          siteNav = fs.readFileSync(wikiSiteNavPath, 'utf8');
        } else {
          siteNav = this.buildSiteNav();
        }

        const convertedLayoutTemplate = VariableRenderer.compile(
          fs.readFileSync(path.join(__dirname, 'siteConvertLayout.njk'), 'utf8'));
        const renderedLayout = convertedLayoutTemplate.render({
          footer,
          siteNav,
        });
        const layoutOutputPath = path.join(this.rootPath, LAYOUT_FOLDER_PATH, LAYOUT_DEFAULT_NAME);

        fs.writeFileSync(layoutOutputPath, renderedLayout, 'utf-8');
      }

      /**
       * Builds a site navigation file from the directory structure of the site.
       */
      buildSiteNav() {
        let siteNavContent = '';
        this.navigablePages
          .filter(navigablePage => !navigablePage.src.startsWith('_'))
          .forEach((page) => {
            const navigablePagePath = path.join(this.rootPath, page.src);
            const relativePagePathWithoutExt = fsUtil.removeExtensionPosix(
              path.relative(this.rootPath, navigablePagePath));
            const pageName = _.startCase(fsUtil.removeExtension(path.basename(navigablePagePath)));
            const pageUrl = `{{ baseUrl }}/${relativePagePathWithoutExt}.html`;
            siteNavContent += `* [${pageName}](${pageUrl})\n`;
          });

        return siteNavContent.trimEnd();
      }

      /**
       * Applies the default layout to all addressable pages by modifying the site config file.
       */
      async addDefaultLayoutToSiteConfig() {
        const configPath = path.join(this.rootPath, SITE_CONFIG_NAME);
        const config = await fs.readJson(configPath);
        await Template.writeToSiteConfig(config, configPath);
      }

      /**
       * Helper function for addDefaultLayoutToSiteConfig().
       */
      static async writeToSiteConfig(config: SiteConfig, configPath: string) {
        const layoutObj: SiteConfigPage = { glob: '**/*.md', layout: LAYOUT_DEFAULT_NAME };
        config.pages.push(layoutObj);
        await fs.outputJson(configPath, config);
      }
    }