(defmodule lcli-cmds
  (export all))

(defun has-commands? (specs)
  "Check to see if the given list of options specs has a ``commands`` element
  defined."
  (lists:any #'commands?/1 specs))

(defun commands? (spec)
  "Check to see if the given spec entry (a single element of an options spec) is
  a ``commands`` entry or not.

  This function differentiates between an option named 'commands' and an actual
  ``commands`` element which provides a list of commands."
  (andalso (== (element 1 spec) 'commands)
           (is_list (element 2 spec))))

(defun not-commands? (spec)
  "A predicate of a form suitable for use in ``lists:filtermap/2``: if the
  provided spec is not a 'commands' return ``#(true spec)`` otherwise return
  ``false``."
  (if (not (commands? spec))
    `#(true ,spec)
    'false))