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If you want the files in a directory, then use a `FileTree`/`ConfigurableFileTree` which is then a `PatternFilterable`.

But FileTree does not preserve directory structure and instead flattens all files

I basically need something like CopySpec, but also acceptable as cacheable task input.

What do you mean by "flattens all files"? What kind of API would you like? Doesn't `visit()` of `FileTree` "preserve directory structure"?

I have tried `project.fileTree("src")` and it returns all files in src directory flattened with no subfolders being preserved.

`visit()` does preserve directories though:
```project.fileTree("src").visit(object : Action&lt;FileVisitDetails&gt; { override fun execute(it: FileVisitDetails) { println(it.file) } })```
