Hello! Is there an appropriate way of saying to the custom Ktlint rule (only custom rule, not other Ktlint default rules) what directories should it check? Now I use the following approach (in Ktlint custom rule class): 1. check the PACKAGE_DIRECTIVE elements -> 2. if the package name is equal to the expected one (related to the directory, which should be checked) -> 3. get parent tree/ parent-child elements -> 4. walk through them, searching for the target nodes (in my case I need to check the type of class fields) -> 5. describe the logic for the rule Are there some other alternatives in order to avoid extra tree/node traversing (maybe additional configurations should be provided)?

There is no such functionality to restrict a rule to certain directories only. But as soon as you know that a file does not fulfil the access criteria you can stop the traversal of the AST of that specific file by calling the

stopTraversalOfAST

function.

would setting the editorconfig also work? ie enabling the rule only on the specified paths

Ah yes, I see what you mean. You could add a glob like:

[/some/dir/*.{kt,kts}]
ktlint_custom-rule-set_custom-rule = disabled

Most difficult thing is that this Glob might overlap with the default glob

[*.{kt.kts}]

. So it will depend on your use case what is most preferable.

Were there any options for

stopTraversalOfAST

in older Ktlint versions, for example, in

0.37.2

v.?

No. Prior to introducing

stopTraversalOfAST

the

visit

method was called for each and every node in the AST. Usually that method contained a if-statement at the top to determine whether something needed to be done or not.