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;;; isearchb.el --- a marriage between iswitchb and isearch -*- lexical-binding: t -*-
;; Copyright (C) 2004-2021 Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; Maintainer: emacs-devel@gnu.org
;; Created: 16 Apr 2004
;; Version: 1.5
;; Keywords: lisp
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This module allows you to switch to buffers even faster than with
;; iswitchb! It is not intended to replace it, however, as it works
;; well only with buffers whose names don't typically overlap. You'll
;; have to try it first, and see how your mileage varies.
;;
;; The first way to use isearchb is by holding down a modifier key, in
;; which case every letter you type while holding it searches for any
;; buffer matching what you're typing (using the same ordering scheme
;; employed by iswitchb). To use it this way, add to your .emacs:
;;
;; (isearchb-set-keybindings 'super) ; s-x s-y s-z now finds "xyz"
;;
;; The other way is by using a command that puts you into "search"
;; mode, just like with isearch. I use C-z for this. The binding in
;; my .emacs looks like:
;;
;; (define-key global-map [(control ?z)] 'isearchb-activate)
;;
;; Now, after pressing C-z (for example), each self-inserting
;; character thereafter will search for a buffer containing those
;; characters. For instance, typing "C-z xyz" will switch to the
;; first buffer containing "xyz". Once you press a non-self-inserting
;; character (such as any control key sequence), the search will end.
;;
;; C-z after C-z toggles between the previously selected buffer and
;; the current one.
;;
;; C-g aborts the search and returns you to your original buffer.
;;
;; TAB, after typing in a few characters (after C-z), will jump into
;; iswitchb, using the prefix you've typed so far. This is handy when
;; you realize that isearchb is not powerful enough to find the buffer
;; you're looking for.
;;
;; C-s and C-r move forward and backward in the buffer list. If
;; `isearchb-show-completions' is non-nil (the default), the list of
;; possible completions is shown in the minibuffer.
;;
;; If `isearchb-idle-timeout' is set to a number, isearchb will quit
;; after that many seconds of idle time. I recommend trying it set to
;; one or two seconds. Then, if you switch to a buffer and wait for
;; that amount of time, you can start typing without manually exiting
;; isearchb.
;; TODO:
;; C-z C-z is broken
;; killing iswitchb.el and then trying to switch back is broken
;; make sure TAB isn't broken
;;; Code:
;; FIXME: Don't rely on iswitchb! See bug#36260.
(with-suppressed-warnings ((obsolete iswitchb))
(require 'iswitchb))
(defgroup isearchb nil
"Switch between buffers using a mechanism like isearch."
:group 'iswitchb)
(defcustom isearchb-idle-timeout nil
"Number of idle seconds before isearchb turns itself off.
If nil, don't use a timeout."
:type '(choice (integer :tag "Seconds")
(const :tag "Disable" nil)))
(defcustom isearchb-show-completions t
"If non-nil, show possible completions in the minibuffer."
:type 'boolean)
(defvar isearchb-start-buffer nil)
(defvar isearchb-last-buffer nil)
(defvar isearchb-idle-timer nil)
(defun isearchb-stop (&optional return-to-buffer ignore-command)
"Called by isearchb to terminate a search in progress."
(remove-hook 'pre-command-hook 'isearchb-follow-char)
(if return-to-buffer
(switch-to-buffer isearchb-start-buffer)
(setq isearchb-last-buffer isearchb-start-buffer))
(when isearchb-idle-timer
(cancel-timer isearchb-idle-timer)
(setq isearchb-idle-timer nil))
(if ignore-command
(setq this-command 'ignore
last-command 'ignore))
(message nil))
(defun isearchb-iswitchb ()
"isearchb's custom version of the `iswitchb' command.
Its purpose is to pass different call arguments to
`iswitchb-read-buffer'."
(interactive)
(let* ((prompt "iswitch ")
(iswitchb-method 'samewindow)
(buf (iswitchb-read-buffer prompt nil nil nil iswitchb-text t)))
(if (eq iswitchb-exit 'findfile)
(call-interactively 'find-file)
(when buf
(if (get-buffer buf)
;; buffer exists, so view it and then exit
(iswitchb-visit-buffer buf)
;; else buffer doesn't exist
(iswitchb-possible-new-buffer buf))))))
(defun isearchb ()
"Switch to buffer matching a substring, based on chars typed."
(interactive)
(unless (eq last-command 'isearchb)
(setq iswitchb-text nil))
(unless iswitchb-text
(setq iswitchb-text "")
(iswitchb-make-buflist nil))
(if last-command-event
(setq iswitchb-rescan t
iswitchb-text (concat iswitchb-text
(char-to-string
(event-basic-type last-command-event)))))
(iswitchb-set-matches)
(let* ((match (car iswitchb-matches))
(buf (and match (get-buffer match))))
(if (null buf)
(progn
(isearchb-stop t)
(isearchb-iswitchb))
(switch-to-buffer buf)
(if isearchb-show-completions
(message "isearchb: %s%s" iswitchb-text
(iswitchb-completions iswitchb-text))
(if (= 1 (length iswitchb-matches))
(message "isearchb: %s (only match)" iswitchb-text)
(message "isearchb: %s" iswitchb-text))))))
(defun isearchb-set-keybindings (modifier)
"Setup isearchb on the given MODIFIER."
(dotimes (i 128)
(if (eq 'self-insert-command
(lookup-key global-map (vector i)))
(define-key global-map (vector (list modifier i)) 'isearchb))))
(defun isearchb-follow-char ()
"Function added to `post-command-hook' to handle the isearchb \"mode\"."
(let (keys)
(if (not (and (memq last-command '(isearchb isearchb-activate))
(setq keys (this-command-keys))
(= 1 (length keys))))
(isearchb-stop)
(cond
((or (equal keys "\C-h") (equal keys "\C-?")
(equal keys [backspace]) (equal keys [delete]))
(setq iswitchb-text
(substring iswitchb-text 0 (1- (length iswitchb-text))))
(if (= 0 (length iswitchb-text))
(isearchb-stop t t)
(setq last-command-event nil)
(setq this-command 'isearchb)))
((or (equal keys "\C-i") (equal keys [tab]))
(setq this-command 'isearchb-iswitchb))
((equal keys "\C-s")
(iswitchb-next-match)
(setq last-command-event nil)
(setq this-command 'isearchb))
((equal keys "\C-r")
(iswitchb-prev-match)
(setq last-command-event nil)
(setq this-command 'isearchb))
((equal keys "\C-g")
(ding)
(isearchb-stop t t))
((eq (lookup-key global-map keys) 'self-insert-command)
(setq this-command 'isearchb)))
(if (and isearchb-idle-timeout
(null isearchb-idle-timer))
(setq isearchb-idle-timer
(run-with-idle-timer isearchb-idle-timeout nil
'isearchb-stop))))))
;;;###autoload
(defun isearchb-activate ()
"Active isearchb mode for subsequent alphanumeric keystrokes.
Executing this command again will terminate the search; or, if
the search has not yet begun, will toggle to the last buffer
accessed via isearchb."
(interactive)
(cond
((eq last-command 'isearchb)
(isearchb-stop nil t))
((eq last-command 'isearchb-activate)
(if isearchb-last-buffer
(switch-to-buffer isearchb-last-buffer)
(error "isearchb: There is no previous buffer to toggle to"))
(isearchb-stop nil t))
(t
(message "isearchb: ")
(setq iswitchb-text nil
isearchb-start-buffer (current-buffer))
(add-hook 'pre-command-hook 'isearchb-follow-char))))
(provide 'isearchb)
;;; isearchb.el ends here
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