Wanted: Fluent interface for specifying filesystem layout

layout.kt

class Repo : Layout() {
    val config by leaf("config.json")
    val myKeyring by leaf("self.keyring")
    val posts by dir("posts", ::PostsDir)
}

class PostsDir : Layout() {
    val post by multiple().dir(name = """[0-9]+""".toRegex(), ::OnePost)
}

class OnePost : Layout() {
    val metadata by leaf("metadata.json")
    val contents by dir("contents", ::PostContents)
}

class PostContents : Layout() {
    val attachment by multiple().leaf() // arbitrary names
}

To be accessed like this:

repo.posts.post(5).contents.attachment() -- produce list of all attachments

Ended up writing it myself:

• A declarative filesystem layout utility: https://github.com/timmc/cavern/blob/7f7bf85535/spelunk/src/main/kotlin/org/timmc/cavern/spelunk/FsLayout.kt
• Declaring a layout: https://github.com/timmc/cavern/blob/7f7bf85535/spelunk/src/main/kotlin/org/timmc/cavern/spelunk/model/Repo.kt
• Using the layout: https://github.com/timmc/cavern/blob/7f7bf85535/spelunk/src/main/kotlin/org/timmc/cavern/spelunk/List.kt#L28-L30