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pollen/pollen/cache.rkt

67 lines
2.8 KiB
Racket

#lang racket/base
(require racket/file
racket/list
racket/path
sugar/define
"private/cache-utils.rkt"
"private/log.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 (cache-directory? path)
(and (directory-exists? path)
(member (path->string (last (explode-path path))) default-cache-names)))
(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 (cache-directory? path))
(message (format "removing cache directory: ~a" path))
(delete-directory/files path)))
(define ((path-error-handler caller-name path-or-path-string) e)
(raise-argument-error caller-name "valid path or path-string" path-or-path-string))
(define-namespace-anchor cache-module-ns)
(define (fetch-val path subkey)
(parameterize ([current-namespace (make-base-namespace)])
;; brings in currently instantiated params (unlike namespace-require)
(define outer-ns (namespace-anchor->namespace cache-module-ns))
(namespace-attach-module outer-ns 'pollen/setup)
(dynamic-require path subkey)))
(define cached-require-base
(let ([ram-cache (make-hash)])
(λ (path-or-path-string subkey caller-name)
(define path
(with-handlers ([exn:fail? (path-error-handler caller-name 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 'source path))
(define (convert-path-to-cache-record)
(when (let ([crs (current-render-source)])
(and crs (not (equal? crs path))))
(message (format "transitively loading /~a" (find-relative-path (current-project-root) path))))
(path->hash path))
(define (get-cache-record) (cache-ref! key convert-path-to-cache-record))
(define ram-cache-record (hash-ref! ram-cache key get-cache-record))
(hash-ref ram-cache-record subkey)]
[else (fetch-val 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 pollen-main-export 'cached-doc))
(define+provide (cached-metas path-string)
(cached-require-base path-string pollen-meta-export 'cached-metas))