Tabrisjs - test if file exists

test-read-write-file.js

const {fs, Button, TextView, TextInput, ui} = require('tabris')

const FILENAME = 'helloxxppp.txt'
const FILEPATH = fs.filesDir
const FULLFILEPATH = FILEPATH + '/' + FILENAME

console.log('FILENAME: \n ' + FILENAME)
console.log('FILEPATH: \n ' + FILEPATH)
console.log('FULLFILEPATH \n: ' + FULLFILEPATH)

// this ALWAYS is false
if (fileExist(FILEPATH, FILENAME)) {
  console.log('File NOT exists\n')
} else {
  console.log('File exists\n')
}

async function fileExist (path, file) {
  let files
  try {
    files = await fs.readDir(path)
    console.log(files)
  } catch (err) {
    return false
  }
  return files.indexOf(file) > -1
}

let btnReadFile = new Button({
  centerX: 0, top: 'prev() 10', width: 200,
  text: 'Read File: ' + FILENAME
}).appendTo(ui.contentView)

btnReadFile.on('select', () => {
  fs.readFile(FULLFILEPATH, 'utf-8')
    .then(text => txiFile.text = text)
    .catch(err => console.error(err))
})

let btnWriteFile = new Button({
  centerX: 0, top: 'prev() 10', width: 200,
  text: 'Write File: ' + FILENAME
}).appendTo(ui.contentView)

let btnRemoveFile = new Button({
  centerX: 0, top: 'prev() 10', width: 200,
  text: 'Remove File: ' + FILENAME
}).appendTo(ui.contentView)

btnWriteFile.on('select', () => {
  fs.writeFile(FULLFILEPATH, txiFile.text, 'utf-8')
    .then(() => console.log('file written:', FULLFILEPATH))
    .catch(err => console.error(err))
})

btnRemoveFile.on('select', () => {
  txiFile.text = ''
  fs.removeFile(FULLFILEPATH)
    .then(() => console.log('file removed:', FULLFILEPATH))
    .catch(err => console.error(err))
})

let txiFile = new TextInput({
  top: 'prev() 20', left: '20%', right: '20%', height: 100,
  type: 'multiline'
}).appendTo(ui.contentView)