(rmail-clear-headers): Handle the last header in a message correctly.

[bpt/emacs.git] / lisp / w32-fns.el

;;; w32-fns.el --- Lisp routines for Windows NT.

;; Copyright (C) 1994 Free Software Foundation, Inc.

;; Author: Geoff Voelker (voelker@cs.washington.edu)

;; This file is part of GNU Emacs.

;; GNU Emacs 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 2, or (at your option)
;; any later version.

;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; (August 12, 1993)
;; Created.

;; (November 21, 1994)
;; [C-M-backspace] defined.
;; mode-line-format defined to show buffer file type.
;; audio bell initialized.

;;; Code:

;; Map delete and backspace
(define-key function-key-map [backspace] "\177")
(define-key function-key-map [delete] "\C-d")
(define-key function-key-map [M-backspace] [?\M-\177])
(define-key function-key-map [C-M-backspace] [\C-\M-delete])

;; Ignore case on file-name completion
(setq completion-ignore-case t)

;; Map all versions of a filename (8.3, longname, mixed case) to the 
;; same buffer.
(setq find-file-visit-truename t)

(defvar w32-system-shells '("cmd" "cmd.exe" "command" "command.com")
  "List of strings recognized as Windows NT/9X system shells.")

(defun w32-using-nt ()
  "Return t if literally running on Windows NT (i.e., not Windows 9X)."
  (and (eq system-type 'windows-nt) (getenv "SystemRoot")))

(defun w32-shell-name ()
  "Return the name of the shell being used."
  (or (and (boundp 'explicit-shell-file-name) explicit-shell-file-name)
      (getenv "ESHELL")
      (getenv "SHELL")
      (and (w32-using-nt) "cmd.exe")
      "command.com"))

(defun w32-system-shell-p (shell-name)
  (and shell-name
       (member (downcase (file-name-nondirectory shell-name)) 
	       w32-system-shells)))

(defun w32-check-shell-configuration ()
  "Check the configuration of shell variables on Windows NT/9X.
This function is invoked after loading the init files and processing
the command line arguments.  It issues a warning if the user or site
has configured the shell with inappropriate settings."
  (let ((prev-buffer (current-buffer))
	(buffer (get-buffer-create "*Shell Configuration*"))
	(system-shell))
    (set-buffer buffer)
    (erase-buffer)
    (if (w32-system-shell-p (getenv "ESHELL"))
	(insert (format "Warning! The ESHELL environment variable uses %s.
You probably want to change it so that it uses cmdproxy.exe instead.\n\n" 
			(getenv "ESHELL"))))
    (if (w32-system-shell-p (getenv "SHELL"))
	(insert (format "Warning! The SHELL environment variable uses %s.
You probably want to change it so that it uses cmdproxy.exe instead.\n\n" 
			(getenv "SHELL"))))
    (if (w32-system-shell-p shell-file-name)
	(insert (format "Warning! shell-file-name uses %s.
You probably want to change it so that it uses cmdproxy.exe instead.\n\n" 
			shell-file-name)))
    (if (and (boundp 'explicit-shell-file-name)
	     (w32-system-shell-p explicit-shell-file-name))
	(insert (format "Warning! explicit-shell-file-name uses %s.
You probably want to change it so that it uses cmdproxy.exe instead.\n\n"
			explicit-shell-file-name)))
    (setq system-shell (> (buffer-size) 0))
    (cond (system-shell
	   ;; System shells.
	   (if (string-equal "-c" shell-command-switch)
	       (insert "Warning! shell-command-switch is \"-c\".
You should set this to \"/c\" when using a system shell.\n\n"))
	   (if w32-quote-process-args
	       (insert "Warning! w32-quote-process-args is t.
You should set this to nil when using a system shell.\n\n")))
	  ;; Non-system shells.
	  (t
	   (if (string-equal "/c" shell-command-switch)
	       (insert "Warning! shell-command-switch is \"/c\".
You should set this to \"-c\" when using a non-system shell.\n\n"))
	   (if (not w32-quote-process-args)
	       (insert "Warning! w32-quote-process-args is nil.
You should set this to t when using a non-system shell.\n\n"))))
    (if (> (buffer-size) 0)
	(display-buffer buffer)
      (kill-buffer buffer))
    (set-buffer prev-buffer)))

(add-hook 'after-init-hook 'w32-check-shell-configuration)

;;; Setup Info-default-directory-list to include the info directory
;;; near where Emacs executable was installed.  We used to set INFOPATH,
;;; but when this is set Info-default-directory-list is ignored.  We
;;; also cannot rely upon what is set in paths.el because they assume
;;; that configuration during build time is correct for runtime.
(defun w32-init-info ()
  (let* ((instdir (file-name-directory invocation-directory))
	 (dir1 (expand-file-name "info/" instdir))
	 (dir2 (expand-file-name "../../../info/" instdir)))
    (if (file-exists-p dir1)
	(setq Info-default-directory-list 
	      (append Info-default-directory-list (list dir1)))
      (if (file-exists-p dir2)
	  (setq Info-default-directory-list
		(append Info-default-directory-list (list dir2)))))))

(add-hook 'before-init-hook 'w32-init-info)

;; Avoid creating auto-save file names containing invalid characters.
(fset 'original-make-auto-save-file-name
      (symbol-function 'make-auto-save-file-name))

(defun make-auto-save-file-name ()
  "Return file name to use for auto-saves of current buffer.
Does not consider `auto-save-visited-file-name' as that variable is checked
before calling this function.  You can redefine this for customization.
See also `auto-save-file-name-p'."
  (convert-standard-filename (original-make-auto-save-file-name)))

(defun convert-standard-filename (filename)
  "Convert a standard file's name to something suitable for the current OS.
This function's standard definition is trivial; it just returns the argument.
However, on some systems, the function is redefined
with a definition that really does change some file names."
  (let ((name (copy-sequence filename))
	(start 0))
    ;; leave ':' if part of drive specifier
    (if (eq (aref name 1) ?:)
	(setq start 2))
    ;; destructively replace invalid filename characters with !
    (while (string-match "[?*:<>|\"\000-\037]" name start)
      (aset name (match-beginning 0) ?!)
      (setq start (match-end 0)))
    name))

;;; Fix interface to (X-specific) mouse.el
(defun x-set-selection (type data)
  (or type (setq type 'PRIMARY))
  (put 'x-selections type data))

(defun x-get-selection (&optional type data-type)
  (or type (setq type 'PRIMARY))
  (get 'x-selections type))

;;; Set to a system sound if you want a fancy bell.
(set-message-beep nil)

;;; The "Windows" keys on newer keyboards bring up the Start menu
;;; whether you want it or not - make Emacs ignore these keystrokes
;;; rather than beep.
(global-set-key [lwindow] 'ignore)
(global-set-key [rwindow] 'ignore)

;; Map certain keypad keys into ASCII characters
;; that people usually expect.
(define-key function-key-map [tab] [?\t])
(define-key function-key-map [linefeed] [?\n])
(define-key function-key-map [clear] [11])
(define-key function-key-map [return] [13])
(define-key function-key-map [escape] [?\e])
(define-key function-key-map [M-tab] [?\M-\t])
(define-key function-key-map [M-linefeed] [?\M-\n])
(define-key function-key-map [M-clear] [?\M-\013])
(define-key function-key-map [M-return] [?\M-\015])
(define-key function-key-map [M-escape] [?\M-\e])

;; These don't do the right thing (voelker)
;(define-key function-key-map [backspace] [127])
;(define-key function-key-map [delete] [127])
;(define-key function-key-map [M-backspace] [?\M-\d])
;(define-key function-key-map [M-delete] [?\M-\d])

;; These tell read-char how to convert
;; these special chars to ASCII.
(put 'tab 'ascii-character ?\t)
(put 'linefeed 'ascii-character ?\n)
(put 'clear 'ascii-character 12)
(put 'return 'ascii-character 13)
(put 'escape 'ascii-character ?\e)
(put 'backspace 'ascii-character 127)
(put 'delete 'ascii-character 127)

;;; w32-fns.el ends here