Well apparently i suck at okio. whats the proper w...

# squarelibraries

[Colton Idle]

Well apparently i suck at okio. whats the proper way to create a directory + file?

@Throws(IOException::class)
fun writeStringToFile(path: Path, myMessage: String) {
  FileSystem.SYSTEM.createDirectories(path)

  FileSystem.SYSTEM.write(path) {
      writeUtf8(myMessage)
  }
}

Calling code

writeStringToFile("mydir/myMessage.json".toPath(), "hello, moto")

Keep getting java.io.IOException: failed to create directory: mydir

edit: maybe cuz im on an emu 🤔

[eygraber]

Android?

[Colton Idle]

Yeah

[Colton Idle]

I don't work with files directly much so im probably missing something basic here. but i thought id be able to write files in my apps sandbox without issue

[eygraber]

Is mydir just a placeholder? You should be using something like https://developer.android.com/reference/android/content/Context#getFilesDir() to get a directory that you can write to

[Colton Idle]

oh. I thought FileSystem.SYSTEM would point to getFileDir

[Colton Idle]

writeStringToFile("${context.filesDir}/mydir/myfile.json".toPath(), "hello, moto")

going to give that a shot 🤞

[Colton Idle]

Had to do this apparently

@Throws(IOException::class)
fun writeStringToFile(pathWithFileName: Path, myMessage: String) {
  FileSystem.SYSTEM.createDirectories(pathWithFileName.parent!!)

  FileSystem.SYSTEM.write(pathWithFileName) {
      writeUtf8(myMessage)
  }
}

[eygraber]

🙈 I always forget about that. I usually declare my files like:

val someFile = File(parent, "foo/bar/baz").apply { parent.mkdirs() }

Aside from that, did you still have to use context.filesDir?

[jw]

There's not much reason to use Okio here

[Benoit Quenaudon]

other sidenote: injecting the filesystem will allow you to write tests sweet and easy

[jw]

not if you bottom out in AtomicFile which only works on `File`s

[Colton Idle]

Oh hm. So instead of okio + moshi + atomicFile I'll just use moshi + atomicFile

[Colton Idle]

I've got okio + moshi working now which is nice though to save to disk.

I tried getting atomicFile involved but couldn't figure out how to use it, but sounds like Jake says that's not possible

[jw]

i still think you should try datastore again

[jw]

all you need to do is implement https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:datastore/datastore-core/src/jvmMain/kotlin/androidx/datastore/core/Serializer.kt;l=29?q=Serializer&ss=androidx which should be a few lines in each callback with Moshi