server.js

const http = require('http')
const chld = require('child_process');
var exec = require('child_process').exec;
const fs = require('fs');
const useragent = require('express-useragent');

const express = require('express');
const bodyParser = require('body-parser');
const app = express();

let del = false;
const server = http.createServer(function(request, response) {
  
  if (request.method == 'POST') {
    //console.log('POST')
    var body = ''
    request.on('data', function(data) {
      body += data
    })
    request.on('end', function() {
      openProgram(body);
    })
  } else {
    // Detects if the user is on mobile or not
    var source = request.headers['user-agent']
    var ua = useragent.parse(source);
    var isMobile = ua.isMobile

    //console.log('GET')
    response.writeHead(200, {'Content-Type': 'text/html'})
    const appText = fs.readFileSync("data.txt",'utf8');
    const appSplit = appText.split(/\r?\n/);

    const lines = appSplit.filter((value, index) => {
      return appSplit.indexOf(value) === index;
    });
    lines.filter(n => n)
    response.write('<input id="add_name" style="display: inline-block;" type="text" placeholder="Name"> <br> <div class="same-line"><form method="post" class="hide-mobile main-button" > <input class="hidden" type="text" name="name" value="BrowseFile" /><input type="submit" value="BrowseFile" /> </form> <br>  <form method="post" class="hide-mobile main-button"> <input class="hidden" type="text" name="name" value="Add" /><input type="submit" value="Add" onclick="deleteTimer()"/> </form>  <br> <form method="post" action=website class="main-button"> <input class="hidden" type="text" name="name" value="Delete"/><input type="submit" value="Delete" onclick="deleteTimer()"/> </form> </div><br>    <br><br>')
    response.write("<table> <tr>")
    var lineNumber = 0;


    for(let i = 0 ; i < lines.length ; i++) {
      if(lines[i] != "") {
        lineNumber++;

        //Adds the shortcut to the current line number
        response.write("<td>")
        let apps = lines[i].split("@")
        response.write('<form method="post" > <input class="hidden" type="text" name="name" value=' + lines[i] + ' /><input id="formPost" type="submit" value=' + apps[0] + ' /> </form>');
        response.write("</td>")

        // If the user is on mobile the shortcuts will be arranged in different ways (default : 10 mobile and 30 pc)
        var res = isMobile ? lines.length/100 * 10 : lines.length/100 * 30;

        if(lineNumber >= res)
        {
          //Closes a line and starts a new one
          response.write("</tr><tr>")
          lineNumber = 0;
        }
      }
    }
    //Ends the table
    response.write("</table>")
    fs.createReadStream('index.html').pipe(response);
  }
});

function openProgram(name)
{
  
  console.log(name)
  let og = name;
  name = decodeURIComponent(name);
  if(name == "name=BrowseFile")
  {
    console.log("File Select")
    exec('py scripts\\file_explorer.py');
  }

  //Saves the new shortcut
  if(name.includes("name=Add"))
  {
    console.log(name);
    name = name.replace("name=Add","");
    let app = name.replace("name=", "").split("@");
    let path = fs.readFileSync('path.txt', 'utf8')
    
    console.log(app)
    
    SaveApps(app[1],path);
    
  }

  if(name == "name=Delete") 
  {
    del = true;
  }

  // Open 
  if (name != "name=Delete" && del == false && !og.includes("Add") && name != "name=BrowseFile") 
  {
    let app = name.replace("name=", "").split("@");
    let path = app[1];
    path = path.replaceAll("^","^");
    //chld.execSync(path)
    exec(path)
  }

  // Delete the shortcut that you click on by removing it from 'data.txt' and then reloading the page
  if(del == true && name != "name=Delete") 
  {
    let app = name.replace("name=", "").split("@");
    let path = app[1];
    path = path;
    const appText = fs.readFileSync("data.txt",'utf8');
    const appSplit = appText.split(/\r?\n/);
    let removeApp = [];

    // The array contains every shortcut from 'data.txt' without the one that the user selected
    let newApps = appSplit.filter(item => item !== app[0] + "@" + path);
    removeApp = newApps;

   newApps.forEach(element => {
     console.log(element);
   });
    fs.writeFile('data.txt','', function() {
      console.log('done');
    });

    // Rewrites the whole data.txt without the deleted shortcut
    var stream = fs.createWriteStream("data.txt", {'flags': 'a'});
    stream.once('open', function(fd) {
      removeApp.forEach(ele => {
        stream.write("\r\n" + ele);
      });
    });
    del = false;

  }
}

//Adds the new shortcut to the "data.txt" file
function SaveApps(name,path)
{
  console.log(name);
  var stream = fs.createWriteStream("data.txt", {'flags': 'a'});
  stream.once('open', function(fd) {
    stream.write("\r\n" + name + "@" + path);
  });
}
// chld.exec(".\\hostServer.bat");


// lt --port 3000
const port = 3000
const host = 'localhost'
server.listen(port, host)
console.log(`Listening at http://${host}:${port}`);