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228 lines
7.9 KiB
EmacsLisp
228 lines
7.9 KiB
EmacsLisp
;;; isearchb --- a marriage between iswitchb and isearch
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;; Copyright (C) 2004, 2005 John Wiegley
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;; Author: John Wiegley <johnw@gnu.org>
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;; Created: 16 Apr 2004
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;; Version: 1.5
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;; Keywords: lisp
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;; X-URL: http://www.newartisans.com/johnw/emacs.html
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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., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; This module allows you to switch to buffers even faster than with
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;; iswitchb! It is not intended to replace it, however, as it works
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;; well only with buffers whose names don't typically overlap. You'll
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;; have to try it first, and see how your mileage varies.
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;;
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;; The first way to use isearchb is by holding down a modifier key, in
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;; which case every letter you type while holding it searches for any
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;; buffer matching what you're typing (using the same ordering scheme
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;; employed by iswitchb). To use it this way, add to your .emacs:
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;;
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;; (isearchb-set-keybindings 'super) ; s-x s-y s-z now finds "xyz"
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;;
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;; The other way is by using a command that puts you into "search"
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;; mode, just like with isearch. I use C-z for this. The binding in
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;; my .emacs looks like:
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;;
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;; (define-key global-map [(control ?z)] 'isearchb-activate)
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;;
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;; Now, after pressing C-z (for example), each self-inserting
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;; character thereafter will search for a buffer containing those
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;; characters. For instance, typing "C-z xyz" will switch to the
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;; first buffer containing "xyz". Once you press a non-self-inserting
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;; character (such as any control key sequence), the search will end.
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;;
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;; C-z after C-z toggles between the previously selected buffer and
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;; the current one.
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;;
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;; C-g aborts the search and returns you to your original buffer.
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;;
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;; TAB, after typing in a few characters (after C-z), will jump into
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;; iswitchb, using the prefix you've typed so far. This is handy when
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;; you realize that isearchb is not powerful enough to find the buffer
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;; you're looking for.
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;;
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;; C-s and C-r move forward and backward in the buffer list. If
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;; `isearchb-show-completions' is non-nil (the default), the list of
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;; possible completions is shown in the minibuffer.
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;;
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;; If `isearchb-idle-timeout' is set to a number, isearchb will quit
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;; after that many seconds of idle time. I recommend trying it set to
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;; one or two seconds. Then, if you switch to a buffer and wait for
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;; that amount of time, you can start typing without manually exiting
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;; isearchb.
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;; TODO:
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;; C-z C-z is broken
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;; killing iswitchb.el and then trying to switch back is broken
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;; make sure TAB isn't broken
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(require 'iswitchb)
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(defgroup isearchb nil
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"Switch between buffers using a mechanism like isearch."
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:group 'iswitchb)
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(defcustom isearchb-idle-timeout nil
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"*Number of idle seconds before isearchb turns itself off.
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If nil, don't use a timeout."
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:type '(choice (integer :tag "Seconds")
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(const :tag "Disable" nil))
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:group 'isearchb)
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(defcustom isearchb-show-completions t
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"*If non-nil, show possible completions in the minibuffer."
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:type 'boolean
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:group 'isearchb)
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(defvar isearchb-start-buffer nil)
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(defvar isearchb-last-buffer nil)
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(defvar isearchb-idle-timer nil)
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(defun isearchb-stop (&optional return-to-buffer ignore-command)
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"Called by isearchb to terminate a search in progress."
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(remove-hook 'pre-command-hook 'isearchb-follow-char)
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(if return-to-buffer
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(switch-to-buffer isearchb-start-buffer)
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(setq isearchb-last-buffer isearchb-start-buffer))
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(when isearchb-idle-timer
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(cancel-timer isearchb-idle-timer)
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(setq isearchb-idle-timer nil))
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(if ignore-command
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(setq this-command 'ignore
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last-command 'ignore))
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(message nil))
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(defun isearchb-iswitchb ()
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"isearchb's custom version of the `iswitchb' command.
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It's purpose is to pass different call arguments to
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`iswitchb-read-buffer'."
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(interactive)
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(let* ((prompt "iswitch ")
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(iswitchb-method 'samewindow)
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(buf (iswitchb-read-buffer prompt nil nil iswitchb-text t)))
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(if (eq iswitchb-exit 'findfile)
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(call-interactively 'find-file)
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(when buf
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(if (get-buffer buf)
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;; buffer exists, so view it and then exit
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(iswitchb-visit-buffer buf)
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;; else buffer doesn't exist
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(iswitchb-possible-new-buffer buf))))))
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(defun isearchb ()
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"Switch to buffer matching a substring, based on chars typed."
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(interactive)
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(unless (eq last-command 'isearchb)
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(setq iswitchb-text nil))
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(unless iswitchb-text
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(setq iswitchb-text "")
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(iswitchb-make-buflist nil))
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(if last-command-char
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(setq iswitchb-rescan t
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iswitchb-text (concat iswitchb-text
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(char-to-string last-command-char))))
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(iswitchb-set-matches)
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(let* ((match (car iswitchb-matches))
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(buf (and match (get-buffer match))))
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(if (null buf)
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(progn
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(isearchb-stop t)
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(isearchb-iswitchb))
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(switch-to-buffer buf)
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(if isearchb-show-completions
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(message "isearchb: %s%s" iswitchb-text
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(iswitchb-completions iswitchb-text))
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(if (= 1 (length iswitchb-matches))
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(message "isearchb: %s (only match)" iswitchb-text)
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(message "isearchb: %s" iswitchb-text))))))
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(defun isearchb-set-keybindings (modifier)
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"Setup isearchb on the given MODIFIER."
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(dotimes (i 128)
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(if (eq 'self-insert-command
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(lookup-key global-map (vector i)))
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(define-key global-map (vector (list modifier i)) 'isearchb))))
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(defun isearchb-follow-char ()
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"Function added to post-command-hook to handle the isearchb \"mode\"."
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(let (keys)
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(if (not (and (memq last-command '(isearchb isearchb-activate))
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(setq keys (this-command-keys))
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(= 1 (length keys))))
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(isearchb-stop)
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(cond
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((or (equal keys "\C-h") (equal keys "\C-?")
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(equal keys [backspace]) (equal keys [delete]))
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(setq iswitchb-text
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(substring iswitchb-text 0 (1- (length iswitchb-text))))
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(if (= 0 (length iswitchb-text))
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(isearchb-stop t t)
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(setq last-command-char nil)
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(setq this-command 'isearchb)))
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((or (equal keys "\C-i") (equal keys [tab]))
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(setq this-command 'isearchb-iswitchb))
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((equal keys "\C-s")
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(iswitchb-next-match)
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(setq last-command-char nil)
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(setq this-command 'isearchb))
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((equal keys "\C-r")
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(iswitchb-prev-match)
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(setq last-command-char nil)
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(setq this-command 'isearchb))
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((equal keys "\C-g")
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(ding)
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(isearchb-stop t t))
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((eq (lookup-key global-map keys) 'self-insert-command)
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(setq this-command 'isearchb)))
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(if (and isearchb-idle-timeout
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(null isearchb-idle-timer))
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(setq isearchb-idle-timer
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(run-with-idle-timer isearchb-idle-timeout nil
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'isearchb-stop))))))
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;;;###autoload
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(defun isearchb-activate ()
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"Active isearchb mode for subsequent alphanumeric keystrokes.
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Executing this command again will terminate the search; or, if
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the search has not yet begun, will toggle to the last buffer
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accessed via isearchb."
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(interactive)
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(cond
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((eq last-command 'isearchb)
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(isearchb-stop nil t))
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((eq last-command 'isearchb-activate)
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(if isearchb-last-buffer
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(switch-to-buffer isearchb-last-buffer)
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(error "isearchb: There is no previous buffer to toggle to"))
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(isearchb-stop nil t))
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(t
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(message "isearchb: ")
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(setq iswitchb-text nil
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isearchb-start-buffer (current-buffer))
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(add-hook 'pre-command-hook 'isearchb-follow-char))))
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(provide 'isearchb)
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;;; arch-tag: 9277523f-a624-4aa0-ba10-b89eeb7b6e99
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;;; isearchb.el ends here
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