stk/Lib/www-file.stk

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;;;;
;;;; w w w - f i l e . s t k -- WWW for STk (FILE: protocol)
;;;;
;;;; Copyright © 1996-1998 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;;
;;;; Permission to use, copy, and/or distribute this software and its
;;;; documentation for any purpose and without fee is hereby granted, provided
;;;; that both the above copyright notice and this permission notice appear in
;;;; all copies and derived works. Fees for distribution or use of this
;;;; software or derived works may only be charged with express written
;;;; permission of the copyright holder.
;;;; This software is provided ``as is'' without express or implied warranty.
;;;;
;;;; This version uses some of the enhancements done by Harvey J. Stein:
;;;; Copyright (c) 1995 Harvey J. Stein (hjstein@math.huji.ac.il)
;;;;
;;;; Author: Erick Gallesio [eg@unice.fr]
;;;; Creation date: 4-Oct-1996 22:14
;;;; Last file update: 28-Feb-1998 11:06
;; Add the "FILE:" protocol
(with-module WWW
(define (generate-html-dir dir out)
;; This function generate a listing of the files in "dir" (HTML format)
(let* ((cwd (getcwd))
(all (lambda (dir) (chdir dir) (glob ".*" "*")))
(files (sort (all dir) string<?))
(link (lambda (img ref txt)
(format out "<A HREF=file:~A>" ref)
(format out "<IMG ALIGN=middle SRC=@~A@.xpm>~A</A>\n"
img txt))))
(chdir cwd)
;; Print Header
(format out "<pre>\n\n</pre><H2> Directory listing of ~A</H2><HR><PRE>\n" dir)
(link "parentdir"
(canonical-path (string-append dir "/.."))
"Up to higher level directory")
;; Print each file
(for-each (lambda (name)
(unless (or (string=? name ".") (string=? name ".."))
(link (if (file-is-directory? (string-append dir "/" name) )
"dir"
"file")
(canonical-path (string-append dir "/" name))
name)))
files)))
(define (get-file: url)
;; This function must return a port and the function to close it
(let ((file (url:filename url)))
(if (or (not file) (string=? file ""))
(set! file "/"))
(if (file-is-directory? file)
;; File is a directory. Generate a HTML directory
(let ((p (open-output-string)))
(generate-html-dir file p)
(let ((f (open-input-string (get-output-string p))))
(cons f
(lambda () (close-port f)))))
;; Normal file
(let((f (open-file file "r")))
(cons f
(if f
(lambda () (close-input-port f))
(lambda () #f)))))))
;; Add the protocol
(WWW:add-protocol 'file get-file:)
)
(provide "www-file")