70 lines
2.3 KiB
Racket
70 lines
2.3 KiB
Racket
#lang racket/base
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;; Unstable library by: Carl Eastlund <cce@ccs.neu.edu>
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;; intended for use in racket/contract, so don't try to add contracts!
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(require setup/path-relativize
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setup/dirs
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(only-in planet/config [CACHE-DIR find-planet-dir]))
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(provide path->directory-relative-string
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library-relative-directories
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setup-relative-directories)
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(define library-relative-directories
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(list (cons find-collects-dir 'collects)
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(cons find-user-collects-dir 'user)
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(cons find-planet-dir 'planet)))
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(define setup-relative-directories
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(list (cons find-collects-dir #f)
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(cons find-user-collects-dir 'user)
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(cons find-planet-dir 'planet)))
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(define (path->directory-relative-string
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path
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#:default [default (if (path? path) (path->string path) path)]
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#:dirs [dirs library-relative-directories])
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(unless (path-string? path)
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(error 'path->directory-relative-string
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"expected a path or a string (first argument); got: ~e" path))
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(unless (and (list? dirs) (andmap pair? dirs))
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(error 'path->directory-relative-string
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"expected an association list (#:dirs keyword argument); got: ~e" dirs))
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(let/ec return
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(when (complete-path? path)
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(for ([dir-entry (in-list dirs)])
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(define find-dir (car dir-entry))
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(define dir-name (cdr dir-entry))
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(unless (and (procedure? find-dir)
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(procedure-arity-includes? find-dir 0))
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(error 'path->directory-relative-string
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"expected keys in association list to be thunks (~a); got: ~e"
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"#:dirs keyword argument"
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find-dir))
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(let ()
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(define-values [ path->relative relative->path ]
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(make-relativize find-dir
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'relative
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'path->relative
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'relative->path))
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(define exploded
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(with-handlers ([exn:fail? (lambda (e) #f)])
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(path->relative path)))
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(when (list? exploded)
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(let* ([relative (path->string
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(apply build-path
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(map bytes->path-element (cdr exploded))))])
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(return
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(if dir-name
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(format "<~a>/~a" dir-name relative)
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(format "~a" relative))))))))
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default))
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