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+;;; enter.ss -- custom module loaders
+
+;; Copyright (C) 2010 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 scheme/base
+
+(require syntax/modcode
+ (for-syntax scheme/base))
+
+(provide get-namespace enter-module module-loader module-loaded?)
+
+(define-struct mod (name timestamp depends))
+
+(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)
+ (parameterize ([inhibit-eval #t])
+ (module->namespace mod)))
+
+(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" compile
+ (lambda (ext loader?)
+ (load-extension ext)
+ #f)
+ #:notify (lambda (chosen)
+ (notify re? chosen)))]
+ [path (normal-case-path
+ (simplify-path
+ (path->complete-path path
+ (or (current-load-relative-directory)
+ (current-directory)))))])
+ ;; Record module timestamp and dependencies:
+ (let ([mod (make-mod name
+ (get-timestamp path)
+ (if code
+ (apply append
+ (map cdr (module-compiled-imports code)))
+ null))])
+ (hash-set! loaded path mod))
+ ;; Evaluate the module:
+ (eval code))
+ ;; Not a module:
+ (begin
+ (notify re? path)
+ (orig path name))))
+
+(define (get-timestamp path)
+ (file-or-directory-modify-seconds path #f (lambda () -inf.0)))
+
+(define (check-latest mod)
+ (let ([mpi (module-path-index-join mod #f)]
+ [done (make-hash)])
+ (let loop ([mpi mpi])
+ (let* ([rpath (module-path-index-resolve mpi)]
+ [path (resolved-module-path-name rpath)])
+ (when (path? path)
+ (let ([path (normal-case-path path)])
+ (unless (hash-ref done path #f)
+ (hash-set! done path #t)
+ (let ([mod (hash-ref loaded path #f)])
+ (when mod
+ (for-each loop (mod-depends mod))
+ (let ([ts (get-timestamp path)])
+ (when (ts . > . (mod-timestamp mod))
+ (let ([orig (current-load/use-compiled)])
+ (parameterize ([current-load/use-compiled
+ (enter-load/use-compiled orig #f)]
+ [current-module-declare-name rpath])
+ ((enter-load/use-compiled orig #t)
+ path
+ (mod-name mod)))))))))))))))
+
+;;; enter.ss ends here