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97 lines
4.4 KiB
Racket
97 lines
4.4 KiB
Racket
#lang racket/base
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(require racket/path racket/file file/cache sugar/coerce "project.rkt" "world.rkt" "rerequire.rkt" "cache-ns.rkt" "debug.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 cached-require paths->key)
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(define 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 cache-dir))
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(define (paths->key source-path [template-path #f] #:subkey [subkey #f])
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;; key is list of file + mod-time pairs, use #f for missing
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(define path-strings (append (list source-path)
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(if (eq? subkey (world:current-meta-export))
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null ; metas only depend on source-path
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(append (list template-path) ; is either path or #f
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(->list (get-directory-require-files source-path))))))
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;; can't use relative paths for cache keys because source files include `here-path` which is absolute.
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;; problem is that cache could appear valid on another filesystem (based on relative pathnames & mod dates)
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;; but would actually be invalid (because the `here-path` names are wrong).
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(define path+mod-time-pairs
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(map (λ(ps) (and ps (let ([cp (->complete-path ps)])
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(cons (path->string cp) (file-or-directory-modify-seconds cp))))) path-strings))
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(cons subkey path+mod-time-pairs))
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(define (key->source-path key)
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(car (cadr key)))
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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 subkey)
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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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(define kvs
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(let ([meta-key (world:current-meta-export)])
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(parameterize ([current-namespace (make-base-namespace)])
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(if (eq? subkey meta-key)
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(list meta-key (dynamic-require (list 'submod path 'metas) meta-key))
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(list subkey (dynamic-require path subkey) meta-key (dynamic-require path meta-key))))))
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(apply hash kvs))
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;; include this from 6.2 for compatibility back to 6.0 (formerly `make-parent-directory*`)
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(define (make-parent-directory p)
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(unless (path-string? p)
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(raise-argument-error 'make-parent-directory "path-string?" p))
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(define (make-directory* dir)
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(let-values ([(base name dir?) (split-path dir)])
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(when (and (path? base) (not (directory-exists? base)))
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(make-directory* base))
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(unless (directory-exists? dir)
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(with-handlers ([exn:fail:filesystem:exists? void])
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(make-directory dir)))))
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(define-values (base name dir?) (split-path p))
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(when (path? base)
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(make-directory* base)))
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(define ram-cache (make-hash))
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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 key (paths->key path #:subkey subkey))
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;; use multiple pickup files to avoid locking issues.
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;; pickup-file hierarchy just mirrors the project hierarchy.
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(define dest-file (build-path cache-dir (path->string (find-relative-path (world:current-project-root) (string->path (format "~a#~a.rktd" (key->source-path key) subkey))))))
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(make-parent-directory dest-file)
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(hash-ref (hash-ref! ram-cache key (λ _
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(cache-file dest-file
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#:exists-ok? #t
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key
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cache-dir
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(λ _
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(write-to-file (path->hash path subkey) dest-file #:exists 'replace))
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#:max-cache-size (world:current-compile-cache-max-size))
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(file->value dest-file))) subkey)]
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[else (parameterize ([current-namespace (make-base-namespace)])
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(dynamic-require path subkey))])) |