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;;; em-banner.el --- sample module that displays a login banner
;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
;; 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; 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.
;;; Code:
(eval-when-compile
(require 'cl)
(require 'esh-mode)
(require 'eshell))
(require 'esh-util)
;;;###autoload
(eshell-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)Login banner")
:group 'eshell-module)
;;; 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)
(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)))
(provide 'em-banner)
;; Local Variables:
;; generated-autoload-file: "esh-groups.el"
;; End:
;; arch-tag: e738b4ef-8671-42ae-a757-291779b92491
;;; em-banner.el ends here
|
