Hi friends! Apologies for the newbie question. :sw...

# clikt

[Paulo Cereda]

Hi friends! Apologies for the newbie question. 😅 The following code works, but I've been wondering if this would be the correct way... I'd like input to be influenced by a flag, so

private val caps by option("--caps").flag()
private val input by argument(name = "input").multiple(required = true).transformAll {
  if (caps) it.map { i -> i.uppercase() } else it
}

I may be mistaken, but I vaguely remember seeing this sort of cross-dependency mentioned somewhere (was it in the documentation?). Any suggestions are welcome! Thanks! Update: check 🧵 .

[Paulo Cereda]

I knew I saw it mentioned! 😁 https://ajalt.github.io/clikt/parameters/#validate

The lambdas you pass to validate are called after the values for all options and arguments have been set, so (unlike in transforms) you can reference other parameters

(emphasis mine)

So I gather my code works by accident, and this practice should be avoided? Thanks!

[Paulo Cereda]

More findings! If I use

private val caps by option("--caps").flag()
private val input by argument(name = "input").convert {
  if (caps) it.uppercase() else it
}.multiple(required = true)

I get

Cannot read from option delegate before parsing command line

which was what I was expecting to get. 🙂 Then I found out about eager, so I could change caps to

private val caps by option("--caps", eager = true).flag()

and then the code works! 🎉 Is this the correct way then? Thanks!

[AJ Alt]

That's the right approach, although since version 5.0, convert is supposed to be able to reference other options without needing eager. But it looks like there's a bug in the implementation of convert that should be easy to fix.

[Paulo Cereda]

Thanks AJ! gratitude thank you