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46 lines
1.7 KiB
Racket
46 lines
1.7 KiB
Racket
#lang racket/base
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(require racket/rerequire "world.rkt")
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;; The cache is a hash with paths as keys.
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;; The cache values are also hashes, with key/value pairs for that path.
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(provide reset-cache current-cache make-cache cached-require cache-ref)
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(define (make-cache) (make-hash))
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(define current-cache (make-parameter (make-cache)))
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(define (reset-cache) (hash-clear! (current-cache)))
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(define (->complete-path path-string)
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(path->complete-path (if (string? path-string) (string->path path-string) path-string)))
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(define (cache-ref path-string)
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(hash-ref (current-cache) (->complete-path path-string)))
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(define (cache-has-key? path)
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(hash-has-key? (current-cache) path))
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(define (cache path)
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(dynamic-rerequire path)
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(hash-set! (current-cache) path (make-hash))
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(define cache-hash (cache-ref path))
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(hash-set! cache-hash 'mod-time (file-or-directory-modify-seconds path))
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(hash-set! cache-hash world:main-pollen-export (dynamic-require path world:main-pollen-export))
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(hash-set! cache-hash world:meta-pollen-export (dynamic-require path world:meta-pollen-export))
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(void))
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(define (cached-require path-string key)
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(when (not (current-cache)) (error "cached-require: No cache set up."))
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(define path
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(with-handlers ([exn:fail? (λ(exn) (error (format "cached-require: ~a is not a valid path" path-string)))])
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(->complete-path path-string)))
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(when (not (file-exists? path)) (error (format "cached-require: ~a does not exist" (path->string path))))
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(when (or (not (cache-has-key? path))
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(> (file-or-directory-modify-seconds path) (hash-ref (cache-ref path) 'mod-time)))
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(cache path))
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(hash-ref (cache-ref path) key)) |