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sugar/file.rkt

56 lines
1.8 KiB
Racket

#lang racket/base
(require "define.rkt" "coerce.rkt" "string.rkt" racket/path)
(define+provide/contract (get-enclosing-dir p)
(coerce/path? . -> . path?)
(simplify-path (build-path p 'up)))
;; does path have a certain extension
(define+provide/contract (has-ext? x ext)
(coerce/path? coerce/string? . -> . coerce/boolean?)
(define ext-of-path (filename-extension x))
(and ext-of-path (equal? (string-downcase (bytes->string/utf-8 ext-of-path)) (string-downcase ext))))
;; get file extension as a string, or return #f
;; (consistent with filename-extension behavior)
(define+provide/contract (get-ext x)
(coerce/path? . -> . (or/c #f string?))
(let ([fe-result (filename-extension x)])
(and fe-result (bytes->string/utf-8 fe-result))))
;; todo: add extensions
(define binary-extensions
(map ->string '(gif jpg jpeg mp3 png zip pdf ico tar ai eps exe)))
(define+provide/contract (has-binary-ext? x)
(coerce/path? . -> . coerce/boolean?)
(ormap (λ(ext) (has-ext? x ext)) binary-extensions))
;; put extension on path
;; use local contract here because this function is used within module
(define/contract+provide (add-ext x ext)
(coerce/string? coerce/string? . -> . coerce/path?)
(string-append x "." ext))
;; take one extension off path
(define+provide/contract (remove-ext x)
(coerce/path? . -> . path?)
;; pass through hidden files (those starting with a dot)
(if (x . starts-with? . ".")
x
(path-replace-suffix x "")))
;; take all extensions off path
(define+provide/contract (remove-ext* x)
(coerce/path? . -> . path?)
;; pass through hidden files (those starting with a dot)
(if (x . starts-with? . ".")
x
(let ([path-with-removed-ext (remove-ext x)])
(if (equal? x path-with-removed-ext)
x
(remove-ext* path-with-removed-ext)))))