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62 lines
2.4 KiB
Racket
62 lines
2.4 KiB
Racket
#lang racket/base
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(require racket/file file/cache sugar/coerce "project.rkt" "world.rkt" racket/rerequire)
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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 cached-require paths->key)
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(define (get-cache-dir)
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(build-path (world:current-project-root) (world:current-cache-dir-name)))
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(define (reset-cache)
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(cache-remove #f (get-cache-dir)))
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(define (paths->key source-path [template-path #f])
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;; key is list of file + mod-time pairs
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(define path-strings (map (compose1 ->string ->complete-path)
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(append (list source-path)
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(if template-path (list template-path) null)
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(or (get-directory-require-files source-path) null))))
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(map cons path-strings (map file-or-directory-modify-seconds path-strings)))
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(define (update-directory-requires source-path)
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(define directory-require-files (get-directory-require-files source-path))
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(and directory-require-files (map dynamic-rerequire directory-require-files))
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(void))
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(define (path->hash path)
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(dynamic-rerequire path)
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;; new namespace forces dynamic-require to re-instantiate 'path'
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;; otherwise it gets cached in current namespace.
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(parameterize ([current-namespace (make-base-namespace)])
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(hash (world:current-main-export) (dynamic-require path (world:current-main-export))
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(world:current-meta-export) (dynamic-require path (world:current-meta-export)))))
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(define (cached-require path-string subkey)
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(define path (with-handlers ([exn:fail? (λ _ (error 'cached-require (format "~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))
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(error (format "cached-require: ~a does not exist" path)))
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(cond
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[(world:current-compile-cache-active)
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(define pickup-file (build-path (get-cache-dir) "pickup.rktd"))
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(let ([key (paths->key path)])
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(cache-file pickup-file
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#:exists-ok? #t
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key
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(get-cache-dir)
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(λ _ (write-to-file (path->hash path) pickup-file #:exists 'replace))
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#:max-cache-size (world:current-compile-cache-max-size)))
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(hash-ref (file->value pickup-file) subkey)]
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[else (parameterize ([current-namespace (make-base-namespace)])
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(dynamic-require path subkey))])) |