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x/lume_langdata/mod.ts

A Lume plugin for developing multi-language websites.
doga/lume_langdata
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// Lume plugin https://lume.land/docs/advanced/plugins/// Generates language data for website multilanguage websites.// Puts the generated data in <srcdir>/<langdir>/_data/lang.yaml.// Also generates a list of the site's languages in <srcdir>/languages.json.// How this plugin is useful:// ▶︎ This data can be used in layouts. For example a layout file can contain "<!DOCTYPE html><html lang='{{ lang.code }}'> ..."// ▶︎ /index.html can shunt the user to his/her preferred language with a JavaScript code such as fetch('/languages.json').then((response) => response.json()).then((siteLanguages) => { /*...*/ });
import * as path from "https://deno.land/std@0.167.0/path/mod.ts";import { Site } from "https://deno.land/x/lume@v1.13.2/core.ts";import YAML from 'https://cdn.skypack.dev/pin/yaml@v2.1.3-ntmfesRl3kdsLKTvvOl6/mode=imports,min/optimized/yaml.js';import * as date from 'https://deno.land/std@0.160.0/datetime/mod.ts';
import {Language} from './modules/language.ts';
export default function () {  return (site: Site) => {    // console.info(`ℹ️ langdata: site: ${JSON.stringify(site)}`);
    const    languages                 : string[] = [],    currentWorkingDirectoryAbs: string   = site.options.cwd,    projectSourceDirectory     : string  = site.options.src,    projectSourceDirectoryAbs  : string  = path.resolve(currentWorkingDirectoryAbs, projectSourceDirectory);
    // console.info(`ℹ️ langdata: currentWorkingDirectoryAbs: ${currentWorkingDirectoryAbs}`);    // console.info(`ℹ️ langdata: projectSourceDirectoryAbs: ${projectSourceDirectoryAbs}`);
    for (const dirEntry of Deno.readDirSync(projectSourceDirectoryAbs)) {      if(!(dirEntry.isDirectory && Language.exists(dirEntry.name)))continue;
      // directory serves the site in this language: dirEntry.name
      const      langCode: string = dirEntry.name,      absLangDirname: string = path.resolve(projectSourceDirectoryAbs, langCode),      absLangDataDirname: string = path.resolve(absLangDirname, '_data');
      // ensure _data dir exists      let absLangDataDirInfo: Deno.FileInfo;      try {        absLangDataDirInfo = Deno.statSync(absLangDataDirname);      } catch (_error) {        // _data does not exist        Deno.mkdirSync(absLangDataDirname);        absLangDataDirInfo = Deno.statSync(absLangDataDirname);      }      if(!absLangDataDirInfo.isDirectory)continue;      // console.log(`  data dir: ${absLangDataDirname}`);
      // ensure lang.yaml file does not exist      const langYamlFilenameAbs = path.resolve(absLangDataDirname, 'lang.yaml');      try {        const langYamlInfo = Deno.statSync(langYamlFilenameAbs);        // lang.yaml exists        if(!langYamlInfo.isFile)continue;        Deno.removeSync(langYamlFilenameAbs);      } catch (_error) {        // lang.yaml does not exist      }
      // write lang.yaml      try {        const        now       = new Date(),        timestamp = date.format(now, "yyyy-MM-dd"),        langData  = {code: langCode },        yaml      = YAML.stringify(langData);
        if(!yaml)throw new Error('');
        Deno.writeTextFileSync(          langYamlFilenameAbs,          `# This file was automatically generated at build time# on ${timestamp} by the "langdata" Lume plugin.${yaml}`);      } catch (_error) {        // should never happen      }
      languages.push(langCode);    }
    // write <srcdir>/languages.json    const langsFilenameAbs : string = path.resolve(projectSourceDirectoryAbs, 'languages.json');    try {      const langsFilenameInfo: Deno.FileInfo = Deno.statSync(langsFilenameAbs);      // <srcdir>/languages.json exists      if(!langsFilenameInfo.isFile)return;      Deno.removeSync(langsFilenameAbs);    } catch (_error) {      // <srcdir>/languages.json does not exist    }    try {      Deno.writeTextFileSync(langsFilenameAbs, JSON.stringify(languages));    } catch (_error) {      console.error(`Error when writing languages file: ${langsFilenameAbs}`);    }
  };}