From 94f76a1565f09d189d9f2cef6d3df7860321709e Mon Sep 17 00:00:00 2001
From: Jose Antonio Ortega Ruiz <jao@gnu.org>
Date: Sun, 23 May 2010 23:10:52 +0200
Subject: Racket support (PLT 5 needed).

---
 scheme/plt/geiser/modules.rkt | 147 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 scheme/plt/geiser/modules.rkt

(limited to 'scheme/plt/geiser/modules.rkt')

diff --git a/scheme/plt/geiser/modules.rkt b/scheme/plt/geiser/modules.rkt
new file mode 100644
index 0000000..829cf77
--- /dev/null
+++ b/scheme/plt/geiser/modules.rkt
@@ -0,0 +1,147 @@
+;;; modules.ss -- module metadata
+
+;; Copyright (C) 2009, 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 May 06, 2009 02:35
+
+#lang scheme
+
+(provide load-module
+         ensure-module-spec
+         module-spec->namespace
+         namespace->module-path-name
+         module-path-name->name
+         module-spec->path-name
+         module-list
+         module-exports)
+
+(require srfi/13 syntax/modresolve syntax/modcode geiser/enter)
+
+(define (ensure-module-spec spec)
+  (cond ((symbol? spec) spec)
+        ((not (string? spec)) #f)
+        (else `(file ,spec))))
+
+(define (module-spec->namespace spec (lang #f))
+  (let ((spec (ensure-module-spec spec))
+        (try-lang (lambda (_)
+                    (with-handlers ((exn? (const (current-namespace))))
+                      (and lang
+                           (begin
+                             (load-module lang #f (current-namespace))
+                             (module->namespace lang)))))))
+    (or (and spec
+             (with-handlers ((exn? try-lang)) (get-namespace spec)))
+        (current-namespace))))
+
+(define nowhere (open-output-nowhere))
+
+(define (load-module spec (port #f) (ns #f))
+  (parameterize ((current-error-port (or port nowhere)))
+    (enter-module (ensure-module-spec spec))
+    (when (namespace? ns)
+      (current-namespace ns))))
+
+(define (namespace->module-path-name ns)
+  (let ((rmp (variable-reference->resolved-module-path
+              (eval '(#%variable-reference) ns))))
+    (and (resolved-module-path? rmp)
+         (resolved-module-path-name rmp))))
+
+(define (module-spec->path-name spec)
+  (with-handlers ((exn? (lambda (_) #f)))
+    (let ((ns (module-spec->namespace (ensure-module-spec spec))))
+      (namespace->module-path-name ns))))
+
+(define (module-path-name->name path)
+  (cond ((path? path)
+         (let* ((path (path->string path))
+                (cpaths (map (compose path->string path->directory-path)
+                             (current-library-collection-paths)))
+                (prefix-len (lambda (p)
+                              (let ((pl (string-length p)))
+                                (if (= pl (string-prefix-length p path))
+                                    pl
+                                    0))))
+                (lens (map prefix-len cpaths))
+                (real-path (substring path (apply max lens))))
+           (if (absolute-path? real-path)
+               (call-with-values (lambda () (split-path path))
+                 (lambda (_ basename __) (path->string basename)))
+               (regexp-replace "\\.[^./]*$" real-path ""))))
+        ((eq? path '#%kernel) "(kernel)")
+        ((string? path) path)
+        ((symbol? path) (symbol->string path))
+        (else "")))
+
+(define (skippable-dir? path)
+  (call-with-values (lambda () (split-path path))
+    (lambda (_ basename __)
+      (member (path->string basename) '(".svn" "compiled")))))
+
+(define path->symbol (compose string->symbol path->string))
+
+(define (path->entry path)
+  (and (bytes=? (or (filename-extension path) #"") #"ss")
+       (let ((path (path->string path)))
+         (substring path 0 (- (string-length path) 3)))))
+
+(define (visit-module-path path kind acc)
+  (case kind
+    ((file) (let ((entry (path->entry path)))
+              (if entry (cons entry acc) acc)))
+    ((dir) (cond ((skippable-dir? path) (values acc #f))
+                 ((file-exists? (build-path path "main.ss"))
+                  (cons (path->string path) acc))
+                 (else acc)))
+    (else acc)))
+
+(define (find-modules path acc)
+  (if (directory-exists? path)
+      (parameterize ((current-directory path))
+        (fold-files visit-module-path acc))
+      acc))
+
+(define (known-modules)
+  (sort (foldl find-modules '() (current-library-collection-paths)) string<?))
+
+(define module-cache #f)
+(define (update-module-cache)
+  (when (not module-cache) (set! module-cache (known-modules))))
+
+(define (module-list)
+  (update-module-cache)
+  module-cache)
+
+(define (module-exports mod)
+  (define (extract-ids ls)
+    (append-map (lambda (idls)
+                  (map car (cdr idls)))
+                ls))
+  (define (classify-ids ids ns)
+    (let loop ((ids ids) (procs '()) (vars '()))
+      (cond ((null? ids)
+             `((procs ,@(reverse procs)) (vars ,@(reverse vars))))
+            ((procedure?
+              (namespace-variable-value (car ids) #t (const #f) ns))
+             (loop (cdr ids) (cons (car ids) procs) vars))
+            (else (loop (cdr ids) procs (cons (car ids) vars))))))
+  (let-values (((reg syn)
+                (module-compiled-exports
+                 (get-module-code (resolve-module-path mod #f)))))
+    (let ((syn (extract-ids syn))
+          (reg (extract-ids reg)))
+      `((syntax ,@syn) ,@(classify-ids reg (module-spec->namespace mod))))))
+
+(define (startup)
+ (thread update-module-cache)
+ (void))
+
+(startup)
+
+;;; modules.ss ends here
-- 
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