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pollen/pollen/cache.rkt

53 lines
2.3 KiB
Racket

#lang racket/base
(require racket/file
sugar/define
"private/cache-utils.rkt"
"private/debug.rkt"
"setup.rkt")
;; The cache is a hash with paths as keys.
;; The cache values are also hashes, with key/value pairs for that path.
(define+provide (reset-cache [starting-dir (current-project-root)])
(unless (and (path-string? starting-dir) (directory-exists? starting-dir))
(raise-argument-error 'reset-cache "path-string to existing directory" starting-dir))
(for ([path (in-directory starting-dir)]
#:when (and (directory-exists? path)
(let* ([last (compose1 car reverse)]
[last-path-element (path->string (last (explode-path path)))])
(member last-path-element default-cache-names))))
(message (format "removing cache directory: ~a" path))
(delete-directory/files path)))
(define-namespace-anchor cache-module-ns)
(define cached-require-base
(let ([ram-cache (make-hash)])
(λ(path-or-path-string subkey caller-name)
(define path (with-handlers ([exn:fail? (λ(e) (raise-argument-error caller-name "valid path or path-string" path-or-path-string))])
(path->complete-path (if (path? path-or-path-string)
path-or-path-string
(string->path path-or-path-string)))))
(unless (file-exists? path)
(raise-argument-error caller-name "path to existing file" path-or-path-string))
(cond
[(setup:compile-cache-active path)
(define key (paths->key path))
(hash-ref (hash-ref! ram-cache key (λ _ (cache-ref! key (λ _ (path->hash path))))) subkey)]
[else (parameterize ([current-namespace (make-base-namespace)])
(namespace-attach-module (namespace-anchor->namespace cache-module-ns) 'pollen/setup) ; brings in params
(dynamic-require path subkey))]))))
(define+provide (cached-require path-string subkey)
(cached-require-base path-string subkey 'cached-require))
(define+provide (cached-doc path-string)
(cached-require-base path-string (setup:main-export) 'cached-doc))
(define+provide (cached-metas path-string)
(cached-require-base path-string (setup:meta-export) 'cached-metas))