characterises a filter based on type

(characterise-filter “src”) => (just {:tag :pattern :pattern #“src”})

(characterise-filter (fn _ nil)) => (just {:tag :fn :fn fn?})

shows all options for file operations

(option) => (contains :atomic-move :create-new :skip-siblings :read :continue :create :terminate :copy-attributes :append :truncate-existing :sync :follow-links :delete-on-close :write :dsync :replace-existing :sparse :nofollow-links :skip-subtree)

(option :read) => java.nio.file.StandardOpenOption/READ

takes a string as turns it into a regex pattern

(pattern “.clj”) => #“\Q.\Eclj”

(pattern “src/*”) => #“src/.+”

adds a tag to the filter to identify the type

(tag-filter {:pattern #“hello”}) => (just {:tag :pattern :pattern #“hello”})