(some->
  cfg-file-path
  jio/file
  readable-or-nil
  slurp
  edn/read-string)

(map (every-pred identity) [1 2 nil true false 3])
=> (true true false true false true)
(map (some-fn identity) [1 2 nil true false 3])
=> (1 2 nil true false 3)

(defn test-pred
  "Return `x` when `(pred x)` is truthy."
  [x pred]
  (when (pred x) x))

(some->
  cfg-file-path
  jio/file
  (test-pred readable?)
  slurp
  edn/read-string)

(some-> false
        (or nil))

(some-> (fs/readable? file)
        (or nil))