Moved new build process out of gulp folder

build/engines.js

@@ -0,0 +1,251 @@
+
+const path = require('path');
+
+const fs = require('fs-extra');
+const log = require('fancy-log');
+const { minify } = require('html-minifier-terser');
+const { resolve, readFile, ENGINE } = require('./resolve');
+
+const handlebars = require('handlebars');
+const HandlebarsKit = require('hbs-kit');
+HandlebarsKit.load(handlebars);
+
+const slugs = require('slugify');
+const slugify = (s) => slugs(s, { remove: /[*+~.,()'"!?:@/\\]/g }).toLowerCase();
+const striptags = require('string-strip-html');
+
+const markdownIt = require('markdown-it');
+
+
+
+const markdownEngines = {
+  full: markdownIt({
+    html: true,
+    linkify: true,
+    typographer: true,
+  })
+    .enable('image')
+    .use(require('markdown-it-anchor'), {
+      permalink: true,
+      permalinkClass: 'header-link',
+      permalinkSymbol: '<img src="/images/svg/paragraph.svg">',
+      slugify,
+    })
+    .use(require('./lib/markdown-raw-html')),
+
+  preview: markdownIt({
+    html: false,
+    linkify: false,
+    typographer: true,
+  })
+    .use(require('./lib/markdown-token-filter')),
+};
+
+function markdown (mode, input, env) {
+  input = input.replace(/\{!\{([\s\S]*?)\}!\}/mg, (match, contents) => {
+    try {
+      const result = handlebars.compile(contents)(env);
+      return '|||' + result + '|||';
+    } catch (e) {
+      log.error(e);
+      return '';
+    }
+  });
+
+  if (mode === 'preview') {
+    input = striptags(input
+      .replace(/<!--\[[\s\S]*?\]-->/g, '')
+      .replace(/|||[\s\S]*?|||/gi, ''),
+    ).trim();
+    if (input.length > 1000) input = input.slice(0, 1000) + '…';
+    input = input ? markdownEngines[mode].render(input) : '';
+  } else {
+    input = input.replace(/<!--[[\]]-->/g, '');
+  }
+
+  return input ? markdownEngines[mode].render(input, env) : '';
+}
+
+function stripIndent (input) {
+  const match = input.match(/^[^\S\n]*(?=\S)/gm);
+  const indent = match && Math.min(...match.map((el) => el.length));
+
+  if (indent) {
+    const regexp = new RegExp(`^.{${indent}}`, 'gm');
+    input = input.replace(regexp, '');
+  }
+
+  return input;
+}
+
+const MINIFY_CONFIG = {
+  conservativeCollapse: true,
+  collapseWhitespace: true,
+  minifyCSS: true,
+  removeComments: true,
+  removeRedundantAttributes: true,
+};
+
+const HANDLEBARS_PARTIALS = {
+  layout:    'templates/layout.hbs',
+};
+
+module.exports = exports = async function (prod) {
+  for (const [ name, file ] of Object.entries(HANDLEBARS_PARTIALS)) {
+    try {
+      const contents = await readFile(file);
+      const template = handlebars.compile(contents.toString('utf8'));
+      handlebars.registerPartial(name, template);
+    } catch (e) {
+      log.error('Could not execute load partial ' + file, e);
+    }
+  }
+
+  const pageTemplateRaw = await readFile('templates/post.hbs');
+  if (!pageTemplateRaw) throw new Error('Post template was empty?');
+  try {
+    var pageTemplate = handlebars.compile(pageTemplateRaw.toString('utf8'));
+  } catch (e) {
+    log.error('Crash while loading post template', e);
+  }
+
+  const revManifest = prod && await fs.readJson(resolve('rev-manifest.json')).catch(() => {}).then((r) => r || {});
+
+  const helpers = new Injectables(prod, revManifest);
+  handlebars.registerHelper('import', helpers.import());
+  handlebars.registerHelper('markdown', helpers.markdown());
+  handlebars.registerHelper('icon', helpers.icon());
+  handlebars.registerHelper('prod', helpers.production());
+  handlebars.registerHelper('rev', helpers.rev());
+
+  const shrink = (input) => (prod ? minify(input, MINIFY_CONFIG) : input);
+
+  const result = {
+    [ENGINE.HANDLEBARS]: (source, env) => {
+      const template = handlebars.compile(source);
+      return shrink(template(env));
+    },
+    [ENGINE.MARKDOWN]: (source, env) => shrink(pageTemplate({ ...env, contents: markdown('full', source, env) })),
+    [ENGINE.OTHER]: (source) => shrink(source),
+    PREVIEW: (source, env) => markdown('preview', source, env),
+  };
+
+  return result;
+};
+
+class Injectables {
+
+  constructor (prod, revManifest) {
+    this.prod = prod;
+    this.revManifest = revManifest;
+    this.injections = {};
+  }
+
+  _parsePath (tpath, local, type) {
+    if (tpath[0] === '/') tpath = resolve(tpath.slice(1));
+    else if (tpath[0] === '~') tpath = resolve('templates', tpath.slice(2));
+    else tpath = path.resolve(local.cwd, tpath);
+    if (type && !tpath.endsWith(type)) tpath += '.' + type;
+    return tpath;
+  }
+
+  _template (tpath, make) {
+    if (!tpath) throw new Error('Received an empty template path: ' + tpath);
+    if (this.injections[tpath]) return this.injections[tpath];
+
+    if (!fs.existsSync(tpath)) {
+      throw new Error('Injectable does not exist: ' + tpath);
+    }
+
+    let contents;
+    try {
+      contents = fs.readFileSync(tpath).toString('utf8');
+      if (make) contents = make(contents);
+      this.injections[tpath] = contents;
+      return contents;
+    } catch (e) {
+      log.error(e, 'An error occured while loading the injectable: ' + tpath);
+    }
+
+    return '';
+  }
+
+  rev () {
+    const self = this;
+    return function (url) {
+      if (!url) return '';
+      if (url[0] === '/') url = url.substr(1);
+      if (self.prod && self.revManifest[url]) return '/' + self.revManifest[url];
+      return '/' + url;
+    };
+  }
+
+  production () {
+    const self = this;
+    return function (options) {
+      if (!options.fn) return self.prod;
+      return self.prod ? options.fn(this) : options.inverse(this);
+    };
+  }
+
+  markdown () {
+    const self = this;
+    return function (...args) {
+      const { fn } = args.pop();
+      let contents;
+
+      if (fn) {
+        contents = stripIndent(fn(this));
+      } else {
+        let tpath = args.shift();
+        tpath = self._parsePath(tpath, this.local, 'md');
+
+        contents = self._template(tpath);
+      }
+
+      contents = markdown('full', contents, this);
+
+      return new handlebars.SafeString(contents);
+    };
+  }
+
+  import () {
+    const self = this;
+    return function (tpath, ...args) {
+      const { hash } = args.pop();
+      const value = args.shift();
+      const context = handlebars.createFrame(value || this);
+      Object.assign(context, hash || {});
+
+      tpath = self._parsePath(tpath, this.local, 'hbs');
+
+      try {
+        const contents = self._template(tpath, handlebars.compile)(context);
+        return new handlebars.SafeString(contents);
+      } catch (e) {
+        log.error('Could not execute import template ' + tpath, e);
+        return '';
+      }
+    };
+  }
+
+  icon () {
+    const self = this;
+    return function (name, ...args) {
+      const { hash } = args.pop();
+      const tpath = path.join(this.local.root, 'svg', name + '.svg');
+
+      try {
+        const contents = self._template(tpath, (s) =>
+          handlebars.compile(`<span class="svg-icon" {{#if size}}style="width:{{size}}px;height:{{size}}px"{{/if}}>${s}</span>`),
+        )({ size: hash && hash.size });
+
+        return new handlebars.SafeString(contents);
+      } catch (e) {
+        log.error('Could not execute import template ' + tpath, e);
+        return '';
+      }
+    };
+  }
+
+}