ファイル操作

node version 16.13.2

//index.js srcフォルダ destフォルダがある

//元データのあるフォルダ、中に同じ内容のスマホ版とPC版のHTMLが2つづつある
/src/folder_name/a.html
/src/folder_name/sp_a.html
/src/folder_name/b.html
/src/folder_name/sp_b.html
/src/folder_name/…
//テンプレートのあるフォルダ　書き出し先も一緒 template.htmlはテンプレート
/dest/folder_name/template.html

//起動ファイル
index.js 

const fs = require("fs");
const fsPromises = require("fs").promises;
const { JSDOM } = require("jsdom");
const srcDir = "./src/folder_name/";
const newDir = "./dest/folder_name/";
const templateFile = "./dest/template.html";

const fileNameList = fs.readdirSync(srcDir);
const targetFileNames = fileNameList.filter(RegExp.prototype.test, /.*\.html$/);

async function action(pcFile, spFile, newFileName) {
  if (fs.existsSync(pcFile)) {
    try {
      const srcDataPc = await fsPromises.readFile(pcFile, "utf-8");
      const srcDataSp = await fsPromises.readFile(spFile, "utf-8");
      const domPc = new JSDOM(srcDataPc);
      const domSp = new JSDOM(srcDataSp);
      const wrapPc = domPc.window.document.querySelector("#main").innerHTML;
      const wrapSp = domSp.window.document.querySelector("#wrapper").innerHTML;
      try {
        const template = await fsPromises.readFile(newFileName, "utf-8");
        const dom = new JSDOM(template);
        const main = dom.window.document.querySelector(".main");
        let newDiv1 = dom.window.document.createElement("div");
        newDiv1.setAttribute("id", "main");
        newDiv1.setAttribute("class", "pc");
        main.appendChild(newDiv1);
        newDiv1.innerHTML = wrapPc;
        let newDiv2 = dom.window.document.createElement("div");
        newDiv2.setAttribute("id", "wrap");
        newDiv2.setAttribute("class", "sp");
        main.appendChild(newDiv2);
        newDiv2.innerHTML = wrapSp;
        const html = dom.window.document.querySelector("html").outerHTML;
        await fsPromises.writeFile(newFileName, html);
      } catch (err) {
        console.log(err);
      }
    } catch (err) {
      console.log(err);
    }
  }
}

targetFileNames.forEach((targetFileName) => {
  if (targetFileName.includes("sp_")) {
    const anotherFileName = targetFileName.substring(3);
    const pcFile = srcDir + anotherFileName + ".html";
    const spFile = srcDir + targetFileName;
    const newFileName = newDir + anotherFileName  + ".html";

    fs.copyFile(templateFile, newFileName, (err) => {
      if (err) {
        console.log(err.stack);
      } else {
        console.log("Done.");
      }
    });
    action(pcFile, spFile, newFileName);
  }
});