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64 lines
2.0 KiB
Racket
64 lines
2.0 KiB
Racket
#lang racket/base
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(require "define.rkt" "coerce/base.rkt" racket/path)
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;; does path have a certain extension
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(define+provide+safe (has-ext? x ext)
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(pathish? stringish? . -> . boolean?)
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(define ext-of-path (filename-extension (->path x)))
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(->boolean (and ext-of-path (equal? (string-downcase (bytes->string/utf-8 ext-of-path)) (string-downcase (->string ext))))))
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;; get file extension as a string, or return #f
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;; (consistent with filename-extension behavior)
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(define+provide+safe (get-ext x)
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(pathish? . -> . (or/c #f string?))
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(let ([fe-result (filename-extension (->path x))])
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(and fe-result (bytes->string/utf-8 fe-result))))
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;; todo: add extensions
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(provide+safe binary-extensions)
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(define binary-extensions
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(map symbol->string '(gif jpg jpeg mp3 png zip pdf ico tar ai eps exe)))
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(define+provide+safe (has-binary-ext? x)
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(pathish? . -> . boolean?)
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(let ([x (->path x)])
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(and (ormap (λ(ext) (has-ext? x ext)) binary-extensions) #t)))
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;; put extension on path
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;; use local contract here because this function is used within module
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(define+provide+safe (add-ext x ext)
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(stringish? stringish? . -> . pathish?)
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(->path (string-append (->string x) "." (->string ext))))
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(define (starts-with? str starter)
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(define pat (regexp (format "^~a" (regexp-quote starter))))
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(and (regexp-match pat str) #t))
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;; take one extension off path
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(define+provide+safe (remove-ext x)
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(pathish? . -> . path?)
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;; pass through hidden files (those starting with a dot)
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(let ([x (->path x)])
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(if ((->string x) . starts-with? . ".")
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x
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(path-replace-suffix x ""))))
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;; take all extensions off path
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(define+provide+safe (remove-ext* x)
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(pathish? . -> . path?)
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;; pass through hidden files (those starting with a dot)
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(let ([x (->path x)])
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(if ((->string x) . starts-with? . ".")
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x
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(let ([path-with-removed-ext (remove-ext x)])
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(if (equal? x path-with-removed-ext)
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x
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(remove-ext* path-with-removed-ext)))))) |