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89 lines
2.8 KiB
Plaintext
89 lines
2.8 KiB
Plaintext
10 years ago
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#lang scribble/manual
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@(require scribble/eval (for-label racket sugar))
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@(define my-eval (make-base-eval))
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@(my-eval `(require sugar))
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@title{File}
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9 years ago
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@defmodule[#:multi (sugar/file (submod sugar/file safe))]
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10 years ago
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File utilities, mostly in the realm of file extensions. These functions don't access the filesystem.
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Arguments that are @racket[pathish?] can take either a string or a path. For clarity below, I've used strings.
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@defproc[
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(get-ext
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[file-path pathish?])
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(or/c #f string?)]
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Return the last file extension of @racket[_file-path] as a string, or @racket[#f] if it has no extension. Omit the intervening @litchar{.} separator.
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@examples[#:eval my-eval
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(get-ext "foo.txt")
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(get-ext "/path/to/foo.txt")
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(get-ext "/path/to/foo.txt.bar")
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(get-ext "/path/to/file-without-extension")
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(get-ext "/path/to/directory/")]
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@defproc[
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(has-ext?
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[file-path pathish?]
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[ext stringish?])
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boolean?]
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Return @racket[#t] if the last file extension of @racket[_file-path] is @racket[_ext], otherwise @racket[#f].
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@examples[#:eval my-eval
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(has-ext? "foo.txt" "txt")
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(has-ext? "foo.txt" "jpg")
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(has-ext? "foo.jpg.txt" "jpg")]
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@defproc[
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(remove-ext
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[file-path pathish?])
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path?]
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Remove the last file extension of @racket[_file-path], and return the path that remains. If @racket[_file-path] has no extension, you just get the same @racket[_file-path]. Does not use the filesystem.
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@examples[#:eval my-eval
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(remove-ext "foo.txt")
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(remove-ext "/path/to/foo.txt")
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(remove-ext "/path/to/foo.txt.bar")
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(remove-ext (remove-ext "/path/to/foo.txt.bar"))]
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@defproc[
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(remove-ext*
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[file-path pathish?])
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path?]
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Like @racket[remove-ext], just more. Remove all file extensions from @racket[_file-path], and return the path that remains. If @racket[_file-path] has no extensions, you just get the same @racket[_file-path]. Does not use the filesystem.
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@examples[#:eval my-eval
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(remove-ext* "foo.txt")
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(remove-ext* "/path/to/foo.txt")
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(remove-ext* "/path/to/foo.txt.bar")
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(remove-ext* (remove-ext* "/path/to/foo.txt.bar"))]
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@defproc[
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(add-ext
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[file-path pathish?]
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[ext stringish?])
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path?]
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Return a new @racket[_file-path] with @racket[_ext] appended. Note that this does not replace an existing file extension. If that's what you want, then do @racket[(add-ext (remove-ext _file-path) _ext)].
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@examples[#:eval my-eval
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(add-ext "foo" "txt")
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(add-ext "foo.txt" "jpg")
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(add-ext (remove-ext "foo.txt") "jpg")]
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@defproc[
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(get-enclosing-dir
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[path pathish?])
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path?]
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Return the enclosing directory of @racket[_path]. Does not consult the filesystem about whether @racket[_path] is valid. If you reach the @racket[_root] directory, then @racket[(get-enclosing-dir _root)] will just return @racket[_root] again.
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@examples[#:eval my-eval
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(define bin (string->path "/usr/bin"))
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bin
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(get-enclosing-dir bin)
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(get-enclosing-dir (get-enclosing-dir bin))
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(get-enclosing-dir (get-enclosing-dir (get-enclosing-dir bin)))
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]
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