Refer to other option during validation

[lppedd]

I've got a couple of tied options in my command:

private val basePath by option()
  .convert { it.toPath() }
  .defaultLazy { ".".toPath() }
  .validate {
    if (!it.isDirectory()) {
      fail("The base path '$it' does not exist or is not a valid directory")
    }
  }

private val configFile by option()
  .convert { it.toPath() }
  .defaultLazy { "./config.properties".toPath() }
  .validate {
    val tmpPath = basePath.resolve(it)

    if (!tmpPath.isRegularFile()) {
      fail("The configuration file '$tmpPath' does not exist or is not a valid file")
    }
  }

I need to validate configFile by resolving its name against the provided basePath.
Is the way I've done it now the correct way to do it? Or, is there an established way to accomplish the same?

Note the .toPath() comes from Okio multiplatform.

[ajalt]

validate is explicitly run after everything has been parsed, so your approach is fine. The only thing I would change is to use the built-in path conversion, which includes some validation already.

private val basePath by option()
    .path(mustExist = true, canBeFile = false)
    .default(Path("."))

private val configFile by option()
    .path()
    .default(Path("config.properties"))
    .validate {
        val tmpPath = basePath.resolve(it)
        if (!tmpPath.isRegularFile()) {
            fail("The configuration file '$tmpPath' does not exist or is not a valid file")
        }
    }

[lppedd]

Thank you! Unfortunately I'm targeting native so the path options are not applicable. But thanks for the suggestion.