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authorGerd Moellmann <gerd@gnu.org>2000-06-23 05:24:10 +0000
committerGerd Moellmann <gerd@gnu.org>2000-06-23 05:24:10 +0000
commitaffbf6477576c38d98111b55fbb1eb5b13d1a735 (patch)
treee7cccedd38944fc20cf2d20a3949246d8d558bf7 /lisp/eshell/em-banner.el
parent022499fab948938bb763c2a33a8c5ba0c5969fcd (diff)
downloademacs-affbf6477576c38d98111b55fbb1eb5b13d1a735.tar.gz
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+;;; em-banner --- sample module that displays a login banner
+
+;; Copyright (C) 1999, 2000 Free Sofware Foundation
+
+;; 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.
+
+(provide 'em-banner)
+
+(eval-when-compile (require 'esh-maint))
+
+(defgroup eshell-banner nil
+ "This sample module displays a welcome banner at login.
+It exists so that others wishing to create their own Eshell extension
+modules may have a simple template to begin with."
+ :tag "Login banner"
+ :link '(info-link "(eshell.info)Login banner")
+ :group 'eshell-module)
+
+;;; Commentary:
+
+;; There is nothing to be done or configured in order to use this
+;; module, other than to select it by customizing the variable
+;; `eshell-modules-list'. It will then display a version information
+;; message whenever Eshell is loaded.
+;;
+;; This code is only an example of a how to write a well-formed
+;; extension module for Eshell. The better way to display login text
+;; is to use the `eshell-script' module, and to echo the desired
+;; strings from the user's `eshell-login-script' file.
+;;
+;; There is one configuration variable, which demonstrates how to
+;; properly define a customization variable in an extension module.
+;; In this case, it allows the user to change the string which
+;; displays at login time.
+
+;;; User Variables:
+
+(defcustom eshell-banner-message "Welcome to the Emacs shell\n\n"
+ "*The banner message to be displayed when Eshell is loaded.
+This can be any sexp, and should end with at least two newlines."
+ :type 'sexp
+ :group 'eshell-banner)
+
+(put 'eshell-banner-message 'risky-local-variable t)
+
+;;; Code:
+
+(require 'esh-util)
+
+(defcustom eshell-banner-load-hook '(eshell-banner-initialize)
+ "*A list of functions to run when `eshell-banner' is loaded."
+ :type 'hook
+ :group 'eshell-banner)
+
+(defun eshell-banner-initialize ()
+ "Output a welcome banner on initialization."
+ ;; it's important to use `eshell-interactive-print' rather than
+ ;; `insert', because `insert' doesn't know how to interact with the
+ ;; I/O code used by Eshell
+ (unless eshell-non-interactive-p
+ (assert eshell-mode)
+ (assert eshell-banner-message)
+ (let ((msg (eval eshell-banner-message)))
+ (assert msg)
+ (eshell-interactive-print msg))))
+
+(eshell-deftest banner banner-displayed
+ "Startup banner is displayed at point-min"
+ (assert eshell-banner-message)
+ (let ((msg (eval eshell-banner-message)))
+ (assert msg)
+ (goto-char (point-min))
+ (looking-at msg)))
+
+;;; em-banner.el ends here