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;;; enter.rkt -- custom module loaders
;; Copyright (C) 2010, 2012 Jose Antonio Ortega Ruiz
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the Modified BSD License. You should
;; have received a copy of the license along with this program. If
;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
;; Start date: Wed Mar 31, 2010 21:53
#lang racket/base
(require syntax/modcode
(for-syntax racket/base)
racket/path)
(provide get-namespace enter-module module-loader module-loaded?)
(struct mod (name load-path timestamp depends))
(define (make-mod name path ts code)
(let ([deps (if code
(apply append (map cdr (module-compiled-imports code)))
null)])
(mod name (path->string path) ts deps)))
(define loaded (make-hash))
(define (module-loaded? path)
(with-handlers ([exn? (lambda (_) #f)])
(let ([rp (module-path-index-resolve (module-path-index-join path #f))])
(hash-has-key? loaded (resolved-module-path-name rp)))))
(define (enter-module mod)
(dynamic-require mod #f)
(check-latest mod))
(define (module-loader orig)
(enter-load/use-compiled orig #f))
(define (notify re? path)
(when re?
(fprintf (current-error-port) " [re-loading ~a]\n" path)))
(define inhibit-eval (make-parameter #f))
(define (get-namespace mod)
(let ([mod (cond [(symbol? mod) mod]
[(string? mod) (find-module! (string->path mod) mod)]
[(path? mod) (find-module! mod (path->string mod))]
[else mod])])
(and mod
(with-handlers ([exn? (lambda (_) #f)])
(parameterize ([inhibit-eval #t])
(module->namespace mod))))))
(define (find-module! path path-str)
(let ([m (or (hash-ref loaded path #f)
(let loop ([ps (remove path (resolve-paths path))]
[seen '()])
(cond [(null? ps) #f]
[(hash-ref loaded (car ps) #f) =>
(lambda (m)
(add-paths! m (cdr ps))
(add-paths! m (cons path seen))
m)]
[else (loop (cdr ps) (cons (car ps) seen))])))])
(list 'file (or (and m (mod-load-path m)) path-str))))
(define (add-paths! m ps)
(for-each (lambda (p) (hash-set! loaded p m)) ps))
(define (resolve-paths path)
(define (find root rest)
(let* ([alt-root (resolve-path root)]
[same? (equal? root alt-root)])
(cond [(null? rest) (cons root (if same? '() `(,alt-root)))]
[else (let* ([c (car rest)]
[cs (cdr rest)]
[rps (find (build-path root c) cs)])
(if same?
rps
(append rps (find (build-path alt-root c) cs))))])))
(let ([cmps (explode-path path)])
(find (car cmps) (cdr cmps))))
(define ((enter-load/use-compiled orig re?) path name)
(when (inhibit-eval)
(raise (make-exn:fail "namespace not found" (current-continuation-marks))))
(if name
;; Module load:
(let* ([code (get-module-code
path "compiled"
(lambda (e)
(parameterize ([compile-enforce-module-constants #f])
(compile e)))
(lambda (ext loader?) (load-extension ext) #f)
#:notify (lambda (chosen) (notify re? chosen)))]
[dir (or (current-load-relative-directory) (current-directory))]
[path (path->complete-path path dir)]
[path (normal-case-path (simplify-path path))])
(define-values (ts real-path) (get-timestamp path))
(add-paths! (make-mod name path ts code) (resolve-paths path))
(parameterize ([current-module-declare-source path]) (eval code)))
;; Not a module:
(begin (notify re? path) (orig path name))))
(define (get-timestamp path)
(let ([ts (file-or-directory-modify-seconds path #f (lambda () #f))])
(if ts
(values ts path)
(if (regexp-match? #rx#"[.]rkt$" (path->bytes path))
(let* ([alt-path (path-replace-suffix path #".ss")]
[ts (file-or-directory-modify-seconds alt-path
#f
(lambda () #f))])
(if ts
(values ts alt-path)
(values -inf.0 path)))
(values -inf.0 path)))))
(define (check-latest mod flags)
(define mpi (module-path-index-join mod #f))
(define done (make-hash))
(let loop ([mpi mpi])
(define rpath (module-path-index-resolve mpi))
(define path (let ([p (resolved-module-path-name rpath)])
(if (pair? p) (car p) p)))
(when (path? path)
(define npath (normal-case-path path))
(unless (hash-ref done npath #f)
(hash-set! done npath #t)
(define mod (hash-ref loaded npath #f))
(when mod
(for-each loop (mod-depends mod))
(define-values (ts actual-path) (get-timestamp npath))
(when (ts . > . (mod-timestamp mod))
(define orig (current-load/use-compiled))
(parameterize ([current-load/use-compiled
(enter-load/use-compiled orig #f flags)]
[current-module-declare-name rpath]
[current-module-declare-source actual-path])
((enter-load/use-compiled orig #t flags)
npath (mod-name mod)))))))))
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