entries().asSequence()
                .filter { it.name.isClassFilePath }
                .map { kotlinSourceNameOf(it.name) }
        }

    private
    fun sourceNamesFromDir(dir: File): Sequence<String> =
        dir.walkTopDown()
            .filter { it.name.isClassFilePath }
            .map { kotlinSourceNameOf(normaliseFileSeparators(it.relativeTo(dir).path)) }

    private