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;;; modules.rkt -- 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 racket
(provide load-module
ensure-module-spec
module-spec->namespace
namespace->module-name
namespace->module-path-name
module-path-name->name
module-spec->path-name
module-list)
(require srfi/13 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) (current #t))
(define (try-lang)
(and lang
(with-handlers ([exn? (const #f)])
(load-module lang #f (current-namespace))
(module->namespace lang))))
(or (get-namespace spec)
(try-lang)
(and current (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)
(and (symbol? spec)
(or (get-path spec)
(register-path spec
(namespace->module-path-name
(module-spec->namespace spec) #f #f)))))
(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 namespace->module-name
(compose module-path-name->name namespace->module-path-name))
(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)
(let ([ext (filename-extension path)])
(and ext
(or (bytes=? ext #"rkt") (bytes=? ext #"ss"))
(not (bytes=? (bytes-append #"main" ext) (path->bytes path)))
(let* ([path (path->string path)]
[len (- (string-length path) (bytes-length ext) 1)])
(substring path 0 len)))))
(define (visit-module-path path kind acc)
(define (register e p)
(register-path (string->symbol e) (build-path (current-directory) p))
(cons e acc))
(define (find-main ext)
(let ([m (build-path path (string-append "main." ext))])
(and (file-exists? m) m)))
(case kind
[(file) (let ([entry (path->entry path)])
(if (not entry) acc (register entry path)))]
[(dir) (cond [(skippable-dir? path) (values acc #f)]
[(or (find-main "rkt") (find-main "ss")) =>
(curry register (path->string path))]
[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 registered (make-hash))
(define (get-path mod) (hash-ref registered mod #f))
(define (register-path mod path)
(hash-set! registered mod path)
path)
(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 (startup)
(thread update-module-cache)
(void))
(startup)
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