Python's os.isatty() function equivalent to Babashka

is_tty.clj

#!/usr/bin/env bb

(ns is-tty
  (:require [babashka.process :as p]))

(defn- is-tty
  [fd key]
  (-> ["test" "-t" (str fd)]
      (p/process {key :inherit :env {}})
      deref
      :exit
      (= 0)))

(defn in-is-tty? [] (is-tty 0 :in))
(defn out-is-tty? [] (is-tty 1 :out))
(defn err-is-tty? [] (is-tty 2 :err))

(when (= *file* (System/getProperty "babashka.file"))
  (println (in-is-tty?) (out-is-tty?) (err-is-tty?)))

;; $ bb is-tty.clj
;; true true true
;;
;; $ bb is-tty.clj </dev/null
;; false true true
;;
;; $ bb is-tty.clj 1>&2 >/dev/null
;; true false true
;;
;; $ bb is-tty.clj 2>/dev/null
;; true true false