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;;; esh-toggle --- toggle to and from the *eshell* buffer
;; Copyright (C) 1997, 1998, 2000, 2001 Mikael Sjödin (mic@docs.uu.se)
;; Author: Mikael Sjödin <mic@docs.uu.se>
;; John Wiegley <johnw@gnu.org>
;; Created: 19 Nov 1998
;; Version: 2.0
;; Keywords: processes
;; X-URL: http://www.gci-net.com/users/j/johnw/eshell.html
;; This program 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.
;; This program 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:
;; Provides the command eshell-toggle which toggles between the
;; *eshell* buffer and whatever buffer you are editing.
;;
;; This is done in an "intelligent" way. Features are:
;;
;; - Starts a eshell if non is existing.
;;
;; - Minimum distortion of your window configuration.
;;
;; - When done in the eshell-buffer you are returned to the same
;; window configuration you had before you toggled to the eshell.
;;
;; - If you desire, you automagically get a "cd" command in the
;; eshell to the directory where your current buffers file exists;
;; just call eshell-toggle-cd instead of eshell-toggle.
;;
;; - You can convinently choose if you want to have the eshell in
;; another window or in the whole frame. Just invoke eshell-toggle
;; again to get the eshell in the whole frame.
;;
;; This file has been tested under Emacs 20.2.
;;
;; To use, call the functions `eshell-toggle' or `eshell-toggle-cd'.
;; It's most helpful to bind these to a key.
;;; Thanks to:
;; Christian Stern <Christian.Stern@physik.uni-regensburg.de> for
;; helpful sugestions.
;;; User Variables:
(defvar eshell-toggle-goto-eob t
"*If non-nil `eshell-toggle' moves point to end of Eshell buffer.
When `eshell-toggle-cd' is called the point is always moved to the
end of the eshell-buffer")
(defvar eshell-toggle-automatic-cd t
"*If non-nil `eshell-toggle-cd' will send a \"cd\" to Eshell.
If nil `eshell-toggle-cd' will only insert the \"cd\" command in the
eshell-buffer. Leaving it to the user to press RET to send the
command to the eshell.")
;;; User Functions:
;;;###autoload
(defun eshell-toggle-cd ()
"Calls `eshell-toggle' with a prefix argument.
See the command `eshell-toggle'"
(interactive)
(eshell-toggle t))
;;;###autoload
(defun eshell-toggle (make-cd)
"Toggles between the *eshell* buffer and the current buffer.
With a prefix ARG also insert a \"cd DIR\" command into the eshell,
where DIR is the directory of the current buffer.
Call twice in a row to get a full screen window for the *eshell*
buffer.
When called in the *eshell* buffer returns you to the buffer you were
editing before caling the first time.
Options: `eshell-toggle-goto-eob'"
(interactive "P")
;; Try to descide on one of three possibilities:
;; 1. If not in eshell-buffer, switch to it.
;; 2. If in eshell-buffer and called twice in a row, delete other
;; windows
;; 3. If in eshell-buffer and not called twice in a row, return to
;; state before going to the eshell-buffer
(if (eq major-mode 'eshell-mode)
(if (and (or (eq last-command 'eshell-toggle)
(eq last-command 'eshell-toggle-cd))
(not (eq (count-windows) 1)))
(delete-other-windows)
(eshell-toggle-buffer-return-from-eshell))
(eshell-toggle-buffer-goto-eshell make-cd)))
;;; Internal Functions:
(defvar eshell-toggle-pre-eshell-win-conf nil
"Contains window config before the *eshell* buffer was selected")
(defun eshell-toggle-buffer-return-from-eshell ()
"Restores window config used before switching the *eshell* buffer.
If no configuration has been stored, just bury the *eshell* buffer."
(if (window-configuration-p eshell-toggle-pre-eshell-win-conf)
(progn
(set-window-configuration eshell-toggle-pre-eshell-win-conf)
(setq eshell-toggle-pre-eshell-win-conf nil)
(bury-buffer (get-buffer "*eshell*")))
(bury-buffer)))
(defun eshell-toggle-buffer-goto-eshell (make-cd)
"Switches other window to the *eshell* buffer.
If no *eshell* buffer exists start a new eshell and switch to it in
other window. If argument MAKE-CD is non-nil, insert a \"cd DIR\"
command into the eshell, where DIR is the directory of the current
buffer.
Stores the window cofiguration before creating and/or switching window."
(setq eshell-toggle-pre-eshell-win-conf (current-window-configuration))
(let ((eshell-buffer (get-buffer "*eshell*"))
(cd-command
;; Find out which directory we are in (the method differs for
;; different buffers)
(or (and make-cd
(buffer-file-name)
(file-name-directory (buffer-file-name))
(concat "cd " (file-name-directory (buffer-file-name))))
(and make-cd
list-buffers-directory
(concat "cd " list-buffers-directory)))))
;; Switch to an existin eshell if one exists, otherwise switch to
;; another window and start a new eshell
(if eshell-buffer
(switch-to-buffer-other-window eshell-buffer)
(eshell-toggle-buffer-switch-to-other-window)
;; Sometimes an error is generated when I call `eshell' (it has
;; to do with my eshell-mode-hook which inserts text into the
;; newly created eshell-buffer and thats not allways a good
;; idea).
(condition-case the-error
(eshell)
(error (switch-to-buffer "*eshell*"))))
(if (or cd-command eshell-toggle-goto-eob)
(goto-char (point-max)))
(if cd-command
(progn
(insert cd-command)
(if eshell-toggle-automatic-cd
(eshell-send-input))))))
(defun eshell-toggle-buffer-switch-to-other-window ()
"Switches to other window.
If the current window is the only window in the current frame, create
a new window and switch to it. (This is less intrusive to the current
window configuration then `switch-buffer-other-window')"
(let ((this-window (selected-window)))
(other-window 1)
;; If we did not switch window then we only have one window and
;; need to create a new one.
(if (eq this-window (selected-window))
(progn
(split-window-vertically)
(other-window 1)))))
(provide 'esh-toggle)
;;; esh-toggle.el ends here
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