1.12 Working with Files and Directories: "dir.rkt"
| (require htdp/dir) | package: htdp-lib |
The teachpack provides structures and functions for working with files and directories:
struct
(struct dir (name dirs files) #:extra-constructor-name make-dir) name : symbol? dirs : (listof dir?) files : (listof file?)
struct
(struct file (name size content) #:extra-constructor-name make-file) name : symbol? size : integer? content : (listof char?)
procedure
(create-dir path) → dir?
path : symbol?
Turns the directory found at path on your computer into an instance of dir?.
Sample: Set teachpack to "dir.rkt" and click Run:
> (create-dir ".") (make-dir '|.| empty (cons (make-file 'ball1.gif 1289 empty) (cons (make-file 'blueball.gif 205 empty) (cons (make-file 'greenbal.gif 204 empty) (cons (make-file 'redball.gif 203 empty) (cons (make-file 'ufo.gif 1044 empty) (cons (make-file 'gif-test.rkt 5811 empty) empty)))))))
Using “.” usually means the directory in which your program is
located. In this case, the directory contains no sub-directories and six
files.
Note: Soft links are always treated as if they were empty files.