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pollen/cache.rkt

51 lines
2.0 KiB
Racket

#lang racket/base
(require racket/path racket/file file/cache sugar/coerce "project.rkt" "world.rkt" racket/rerequire "debug.rkt")
;; The cache is a hash with paths as keys.
;; The cache values are also hashes, with key/value pairs for that path.
(provide reset-cache cached-require paths->key path->hash)
(provide (all-from-out racket/rerequire))
(define (get-cache-dir)
(build-path (world:current-project-root) (world:current-cache-dir-name)))
(define (reset-cache)
(cache-remove #f (get-cache-dir)))
(define (paths->key source-path [template-path #f])
;; key is list of file + mod-time pairs
(define path-strings (map (compose1 ->string ->complete-path)
(append (list source-path)
(if template-path (list template-path) null)
(or (get-directory-require-files source-path) null))))
(map cons path-strings (map file-or-directory-modify-seconds path-strings)))
(define (path->hash path)
(dynamic-rerequire path)
(hash (world:current-main-export) (dynamic-require path (world:current-main-export))
(world:current-meta-export) (dynamic-require path (world:current-meta-export))))
(define (cached-require path-string subkey)
(define path (with-handlers ([exn:fail? (λ _ (error 'cached-require (format "~a is not a valid path" path-string)))])
(->complete-path path-string)))
(when (not (file-exists? path))
(error (format "cached-require: ~a does not exist" path)))
(cond
[(world:current-compile-cache-active)
(define pickup-file (build-path (get-cache-dir) "pickup.rktd"))
(cache-file pickup-file #:exists-ok? #t
(paths->key path)
(get-cache-dir)
(λ _ (write-to-file (path->hash path) pickup-file #:exists 'replace))
#:max-cache-size (world:current-compile-cache-max-size))
(hash-ref (file->value pickup-file) subkey)]
[else ; cache inactive
(dynamic-require path subkey)]))