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;; modules.ss -- module metadata
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Wed May 06, 2009 02:35
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3 of the License, or
;; (at your option) any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
#lang scheme
(provide load-module
module-spec->namespace
namespace->module-path-name
module-path-name->name
module-spec->path-name
module-list)
(require srfi/13 scheme/enter)
(define (ensure-module-spec spec)
(cond ((symbol? spec) spec)
((not (string? spec)) #f)
((not (file-exists? spec)) #f)
((absolute-path? spec) `(file ,spec))
(else spec)))
(define (module-spec->namespace spec)
(let* ((spec (ensure-module-spec spec))
(contract-handler (lambda (e)
(load-module spec)
(enter! #f)
(module->namespace spec)))
(filesystem-handler (lambda (e)
(when (symbol? spec)
(module->namespace `',spec)))))
(if spec
(with-handlers ((exn:fail:contract? contract-handler)
(exn:fail:filesystem? filesystem-handler))
(module->namespace spec))
(current-namespace))))
(define nowhere (open-output-nowhere))
(define (load-module spec . port)
(parameterize ((current-error-port (if (null? port) nowhere (car port))))
(eval #`(enter! #,(ensure-module-spec spec)))))
(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 module-cache #f)
(define (module-list)
(when (not module-cache)
(set! module-cache
(sort (foldl find-modules '() (current-library-collection-paths))
string<?)))
module-cache)
;;; modules.ss ends here
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