Support Kotlin 1.4

[eiswind]

1.4 has the new

fun interface {
}

syntax for sam types. ktlint is already updating this
pinterest/ktlint#726

[JLLeitschuh]

Can you just specify a fixed/released version of ktlint with the version argument to use it?

[JLLeitschuh]

If you're seeing some specific exception when trying to process Kotlin 1.4 code that comes from this plugin, not from ktlint itself, then please provide a stack trace.

[maffelbaffel]

I'm getting the following stacktrace:

Exception in thread "main" java.lang.NoSuchFieldError: FUN_KEYWORD
	at com.pinterest.ktlint.core.ast.ElementType.<clinit>(ElementType.kt:154)
	at com.pinterest.ktlint.ruleset.standard.ChainWrappingRule.<init>(ChainWrappingRule.kt:36)
	at com.pinterest.ktlint.ruleset.standard.StandardRuleSetProvider.get(StandardRuleSetProvider.kt:11)
	at com.pinterest.ktlint.KtlintCommandLine.loadRulesets(Main.kt:546)
	at com.pinterest.ktlint.KtlintCommandLine.run(Main.kt:222)
	at com.pinterest.ktlint.Main.main(Main.kt:62)

There is already a bug filed here.

[JLLeitschuh]

This stack trace is purely in ktlint, not this plugin. If there are still issues after an official Ktlint release is published, please leave a comment and I'll reopen this issue.