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243 lines
8.4 KiB
EmacsLisp
243 lines
8.4 KiB
EmacsLisp
;;; url-file.el --- File retrieval code
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;; Copyright (c) 1996 - 1999,2004 Free Software Foundation, Inc.
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;; Keywords: comm, data, processes
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;; This file is part of GNU Emacs.
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;;
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;;
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;; Code:
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(eval-when-compile (require 'cl))
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(require 'mailcap)
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(require 'url-vars)
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(require 'url-parse)
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(require 'url-dired)
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(defconst url-file-default-port 21 "Default FTP port.")
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(defconst url-file-asynchronous-p t "FTP transfers are asynchronous.")
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(defalias 'url-file-expand-file-name 'url-default-expander)
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(defun url-file-find-possibly-compressed-file (fname &rest args)
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"Find the exact file referenced by `fname'.
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This tries the common compression extensions, because things like
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ange-ftp and efs are not quite smart enough to realize when a server
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can do automatic decompression for them, and won't find 'foo' if
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'foo.gz' exists, even though the ftp server would happily serve it up
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to them."
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(let ((scratch nil)
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(compressed-extensions '("" ".gz" ".z" ".Z" ".bz2"))
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(found nil))
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(while (and compressed-extensions (not found))
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(if (file-exists-p (setq scratch (concat fname (pop compressed-extensions))))
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(setq found scratch)))
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found))
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(defun url-file-host-is-local-p (host)
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"Return t iff HOST references our local machine."
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(let ((case-fold-search t))
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(or
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(null host)
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(string= "" host)
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(equal (downcase host) (downcase (system-name)))
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(and (string-match "^localhost$" host) t)
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(and (not (string-match (regexp-quote ".") host))
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(equal (downcase host) (if (string-match (regexp-quote ".")
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(system-name))
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(substring (system-name) 0
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(match-beginning 0))
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(system-name)))))))
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(defun url-file-asynch-callback (x y name buff func args &optional efs)
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(if (not (featurep 'ange-ftp))
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;; EFS passes us an extra argument
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(setq name buff
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buff func
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func args
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args efs))
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(let ((size (nth 7 (file-attributes name))))
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(with-current-buffer buff
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(goto-char (point-max))
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(if (/= -1 size)
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(insert (format "Content-length: %d\n" size)))
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(insert "\n")
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(insert-file-contents-literally name)
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(if (not (url-file-host-is-local-p (url-host url-current-object)))
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(condition-case ()
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(delete-file name)
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(error nil)))
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(apply func args))))
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(defun url-file-build-filename (url)
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(if (not (vectorp url))
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(setq url (url-generic-parse-url url)))
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(let* ((user (url-user url))
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(pass (url-password url))
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(port (url-port url))
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(host (url-host url))
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(site (if (and port (/= port 21))
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(if (featurep 'ange-ftp)
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(format "%s %d" host port)
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;; This works in Emacs 21's ange-ftp too.
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(format "%s#%d" host port))
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host))
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(file (url-unhex-string (url-filename url)))
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(filename (if (or user (not (url-file-host-is-local-p host)))
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(concat "/" (or user "anonymous") "@" site ":" file)
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(if (and (memq system-type
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'(emx ms-dos windows-nt ms-windows))
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(string-match "^/[a-zA-Z]:/" file))
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(substring file 1)
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file)))
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pos-index)
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(and user pass
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(cond
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((featurep 'ange-ftp)
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(ange-ftp-set-passwd host user pass))
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((or (featurep 'efs) (featurep 'efs-auto))
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(efs-set-passwd host user pass))
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(t
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nil)))
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;; This makes sure that directories have a trailing directory
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;; separator on them so URL expansion works right.
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;;
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;; FIXME? What happens if the remote system doesn't use our local
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;; directory-sep-char as its separator? Would it be safer to just
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;; use '/' unconditionally and rely on the FTP server to
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;; straighten it out for us?
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;; (if (and (file-directory-p filename)
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;; (not (string-match (format "%c$" directory-sep-char) filename)))
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;; (url-set-filename url (format "%s%c" filename directory-sep-char)))
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(if (and (file-directory-p filename)
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(not (string-match "/\\'" filename)))
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(url-set-filename url (format "%s/" filename)))
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;; If it is a directory, look for an index file first.
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(if (and (file-directory-p filename)
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url-directory-index-file
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(setq pos-index (expand-file-name url-directory-index-file filename))
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(file-exists-p pos-index)
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(file-readable-p pos-index))
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(setq filename pos-index))
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;; Find the (possibly compressed) file
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(setq filename (url-file-find-possibly-compressed-file filename))
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filename))
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;;;###autoload
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(defun url-file (url callback cbargs)
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"Handle file: and ftp: URLs."
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(let* ((buffer nil)
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(uncompressed-filename nil)
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(content-type nil)
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(content-encoding nil)
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(coding-system-for-read 'binary))
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(setq filename (url-file-build-filename url))
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(if (not filename)
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(error "File does not exist: %s" (url-recreate-url url)))
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;; Need to figure out the content-type from the real extension,
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;; not the compressed one.
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(setq uncompressed-filename (if (string-match "\\.\\(gz\\|Z\\|z\\)$" filename)
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(substring filename 0 (match-beginning 0))
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filename))
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(setq content-type (mailcap-extension-to-mime
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(url-file-extension uncompressed-filename))
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content-encoding (case (intern (url-file-extension filename))
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((\.z \.gz) "gzip")
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(\.Z "compress")
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(\.uue "x-uuencoded")
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(\.hqx "x-hqx")
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(\.bz2 "x-bzip2")
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(otherwise nil)))
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(if (file-directory-p filename)
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;; A directory is done the same whether we are local or remote
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(url-find-file-dired filename)
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(with-current-buffer
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(setq buffer (generate-new-buffer " *url-file*"))
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(mm-disable-multibyte)
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(setq url-current-object url)
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(insert "Content-type: " (or content-type "application/octet-stream") "\n")
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(if content-encoding
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(insert "Content-transfer-encoding: " content-encoding "\n"))
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(if (url-file-host-is-local-p (url-host url))
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;; Local files are handled slightly oddly
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(if (featurep 'ange-ftp)
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(url-file-asynch-callback nil nil
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filename
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(current-buffer)
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callback cbargs)
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(url-file-asynch-callback nil nil nil
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filename
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(current-buffer)
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callback cbargs))
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;; FTP handling
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(let* ((extension (url-file-extension filename))
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(new (url-generate-unique-filename
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(and (> (length extension) 0)
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(concat "%s." extension)))))
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(if (featurep 'ange-ftp)
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(ange-ftp-copy-file-internal filename (expand-file-name new) t
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nil t
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(list 'url-file-asynch-callback
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new (current-buffer)
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callback cbargs)
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t)
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(autoload 'efs-copy-file-internal "efs")
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(efs-copy-file-internal filename (efs-ftp-path filename)
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new (efs-ftp-path new)
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t nil 0
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(list 'url-file-asynch-callback
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new (current-buffer)
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callback cbargs)
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0 nil))))))
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buffer))
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(defmacro url-file-create-wrapper (method args)
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`(defalias ',(intern (format "url-ftp-%s" method))
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(defun ,(intern (format "url-file-%s" method)) ,args
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,(format "FTP/FILE URL wrapper around `%s' call." method)
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(setq url (url-file-build-filename url))
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(and url (,method ,@(remove '&rest (remove '&optional args)))))))
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(url-file-create-wrapper file-exists-p (url))
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(url-file-create-wrapper file-attributes (url &optional id-format))
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(url-file-create-wrapper file-symlink-p (url))
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(url-file-create-wrapper file-readable-p (url))
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(url-file-create-wrapper file-writable-p (url))
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(url-file-create-wrapper file-executable-p (url))
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(if (featurep 'xemacs)
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(progn
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(url-file-create-wrapper directory-files (url &optional full match nosort files-only))
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(url-file-create-wrapper file-truename (url &optional default)))
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(url-file-create-wrapper directory-files (url &optional full match nosort))
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(url-file-create-wrapper file-truename (url &optional counter prev-dirs)))
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(provide 'url-file)
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;; arch-tag: 010e914a-7313-494b-8a8c-6495a862157d
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;;; url-file.el ends here
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