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249 lines
8.0 KiB
EmacsLisp
249 lines
8.0 KiB
EmacsLisp
;;; em-rebind --- rebind keys when point is at current input
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;; Copyright (C) 1999, 2000 Free Software Foundation
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;; This file is part of GNU Emacs.
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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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;; 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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;; 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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(provide 'em-rebind)
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(eval-when-compile (require 'esh-maint))
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(defgroup eshell-rebind nil
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"This module allows for special keybindings that only take effect
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while the point is in a region of input text. By default, it binds
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C-a to move to the beginning of the input text (rather than just the
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beginning of the line), and C-p and C-n to move through the input
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history, C-u kills the current input text, etc. It also, if
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`eshell-confine-point-to-input' is non-nil, does not allow certain
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commands to cause the point to leave the input area, such as
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`backward-word', `previous-line', etc. This module intends to mimic
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the behavior of normal shells while the user editing new input text."
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:tag "Rebind keys at input"
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:group 'eshell-module)
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;;; Commentary:
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;;; User Variables:
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(defcustom eshell-rebind-load-hook '(eshell-rebind-initialize)
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"*A list of functions to call when loading `eshell-rebind'."
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:type 'hook
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:group 'eshell-rebind)
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(defcustom eshell-rebind-keys-alist
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'(([(control ?a)] . eshell-bol)
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([home] . eshell-bol)
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([(control ?d)] . eshell-delchar-or-maybe-eof)
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([backspace] . eshell-delete-backward-char)
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([delete] . eshell-delete-backward-char)
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([(control ?w)] . backward-kill-word)
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([(control ?u)] . eshell-kill-input))
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"*Bind some keys differently if point is in input text."
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:type '(repeat (cons (vector :tag "Keys to bind"
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(repeat :inline t sexp))
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(function :tag "Command")))
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:group 'eshell-rebind)
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(defcustom eshell-confine-point-to-input t
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"*If non-nil, do not allow the point to leave the current input.
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This is more difficult to do nicely in Emacs than one might think.
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Basically, the `point-left' attribute is added to the input text, and
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a function is placed on that hook to take the point back to
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`eshell-last-output-end' every time the user tries to move away. But
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since there are many cases in which the point _ought_ to move away
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\(for programmatic reasons), the variable
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`eshell-cannot-leave-input-list' defines commands which are affected
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from this rule. However, this list is by no means as complete as it
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probably should be, so basically all one can hope for is that other
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people will left the point alone in the Eshell buffer. Sigh."
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:type 'boolean
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:group 'eshell-rebind)
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(defcustom eshell-error-if-move-away t
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"*If non-nil, consider it an error to try to move outside current input.
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This is default behavior of shells like bash."
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:type 'boolean
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:group 'eshell-rebind)
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(defcustom eshell-remap-previous-input t
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"*If non-nil, remap input keybindings on previous prompts as well."
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:type 'boolean
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:group 'eshell-rebind)
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(defcustom eshell-cannot-leave-input-list
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'(beginning-of-line-text
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beginning-of-line
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move-to-column
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move-to-column-force
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move-to-left-margin
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move-to-tab-stop
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forward-char
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backward-char
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delete-char
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delete-backward-char
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backward-delete-char
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backward-delete-char-untabify
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kill-paragraph
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backward-kill-paragraph
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kill-sentence
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backward-kill-sentence
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kill-sexp
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backward-kill-sexp
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kill-word
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backward-kill-word
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kill-region
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forward-list
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backward-list
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forward-page
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backward-page
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forward-point
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forward-paragraph
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backward-paragraph
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backward-prefix-chars
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forward-sentence
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backward-sentence
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forward-sexp
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backward-sexp
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forward-to-indentation
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backward-to-indentation
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backward-up-list
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forward-word
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backward-word
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forward-line
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backward-line
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previous-line
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next-line
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forward-visible-line
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forward-comment
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forward-thing)
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"*A list of commands that cannot leave the input area."
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:type '(repeat function)
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:group 'eshell-rebind)
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;; Internal Variables:
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(defvar eshell-input-keymap)
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(defvar eshell-previous-point)
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(defvar eshell-lock-keymap)
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;;; Functions:
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(defun eshell-rebind-initialize ()
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"Initialize the inputing code."
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(unless eshell-non-interactive-p
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(make-local-hook 'eshell-mode-hook)
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(add-hook 'eshell-mode-hook 'eshell-setup-input-keymap nil t)
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(make-local-hook 'pre-command-hook)
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(make-local-variable 'eshell-previous-point)
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(add-hook 'pre-command-hook 'eshell-save-previous-point nil t)
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(make-local-hook 'post-command-hook)
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(make-local-variable 'overriding-local-map)
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(add-hook 'post-command-hook 'eshell-rebind-input-map nil t)
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(set (make-local-variable 'eshell-lock-keymap) nil)
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(define-key eshell-command-map [(meta ?l)] 'eshell-lock-local-map)))
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(defun eshell-lock-local-map (&optional arg)
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"Lock or unlock the current local keymap.
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Within a prefix arg, set the local keymap to its normal value, and
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lock it at that."
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(interactive "P")
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(if (or arg (not eshell-lock-keymap))
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(progn
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(use-local-map eshell-mode-map)
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(setq eshell-lock-keymap t)
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(message "Local keymap locked in normal mode"))
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(use-local-map eshell-input-keymap)
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(setq eshell-lock-keymap nil)
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(message "Local keymap unlocked: obey context")))
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(defun eshell-save-previous-point ()
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"Save the location of point before the next command is run."
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(setq eshell-previous-point (point)))
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(defsubst eshell-point-within-input-p (pos)
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"Test whether POS is within an input range."
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(let (begin)
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(or (and (>= pos eshell-last-output-end)
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eshell-last-output-end)
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(and eshell-remap-previous-input
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(setq begin
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(save-excursion
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(eshell-bol)
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(and (not (bolp)) (point))))
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(>= pos begin)
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(<= pos (line-end-position))
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begin))))
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(defun eshell-rebind-input-map ()
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"Rebind the input keymap based on the location of the cursor."
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(ignore-errors
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(unless eshell-lock-keymap
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(if (eshell-point-within-input-p (point))
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(use-local-map eshell-input-keymap)
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(let (begin)
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(if (and eshell-confine-point-to-input
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(setq begin
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(eshell-point-within-input-p eshell-previous-point))
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(memq this-command eshell-cannot-leave-input-list))
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(progn
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(use-local-map eshell-input-keymap)
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(goto-char begin)
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(if (and eshell-error-if-move-away
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(not (eq this-command 'kill-region)))
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(beep)))
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(use-local-map eshell-mode-map)))))))
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(defun eshell-setup-input-keymap ()
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"Setup the input keymap to be used during input editing."
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(make-local-variable 'eshell-input-keymap)
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(setq eshell-input-keymap (make-sparse-keymap))
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(set-keymap-parent eshell-input-keymap eshell-mode-map)
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(let ((bindings eshell-rebind-keys-alist))
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(while bindings
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(define-key eshell-input-keymap (caar bindings)
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(cdar bindings))
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(setq bindings (cdr bindings)))))
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(defun eshell-delete-backward-char (n &optional killflag)
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"Delete the last character, unless it's part of the output."
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(interactive "P")
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(let ((count (prefix-numeric-value n)))
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(if (eshell-point-within-input-p (- (point) count))
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(delete-backward-char count n)
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(beep))))
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(defun eshell-delchar-or-maybe-eof (arg)
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"Delete ARG characters forward or send an EOF to subprocess.
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Sends an EOF only if point is at the end of the buffer and there is no
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input."
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(interactive "p")
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(let ((proc (get-buffer-process (current-buffer))))
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(if (eobp)
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(cond
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((/= (point) eshell-last-output-end)
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(beep))
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(proc
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(process-send-eof))
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(t
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(eshell-life-is-too-much)))
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(eshell-delete-backward-char (- arg)))))
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;;; Code:
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;;; em-rebind.el ends here
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