File Predicates

There are the usual pathname predicates such as f?, d? and r? which are comparable to familiar shell predicates -f, -d and -r.

file-predicates.idio

define (test-for fn) {
  (cond
   ((f? fn) {
     printf "%s is a file\n" fn
   })
   ((d? fn) {
     printf "%s is a directory\n" fn
   })
   (else {
     printf "%s is beyond knowledge\n" fn
   }))
}

fn := "words.txt"

test-for "."

;; just in case
if (f? fn) (delete-file fn)

test-for fn
touch fn
test-for fn

$ idio file-predicates
. is a directory
words.txt is beyond knowledge
words.txt is a file

Last built at 2025-11-14T07:11:17Z+0000 from 77077af (dev) for Idio 0.3