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609 lines
22 KiB
EmacsLisp
609 lines
22 KiB
EmacsLisp
;;; isearch.el --- incremental search commands
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;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
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;; Maintainer: FSF
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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
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Code:
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(defvar search-last-string "" "\
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Last string search for by a non-regexp search command.
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This does not include direct calls to the primitive search functions,
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and does not include searches that are aborted.")
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(defvar search-last-regexp "" "\
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Last string searched for by a regexp search command.
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This does not include direct calls to the primitive search functions,
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and does not include searches that are aborted.")
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(defconst search-repeat-char ?\C-s "\
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*Character to repeat incremental search forwards.")
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(defconst search-reverse-char ?\C-r "\
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*Character to repeat incremental search backwards.")
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(defconst search-exit-char ?\C-m "\
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*Character to exit incremental search.")
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(defconst search-delete-char ?\177 "\
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*Character to delete from incremental search string.")
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(defconst search-quote-char ?\C-q "\
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*Character to quote special characters for incremental search.")
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(defconst search-yank-word-char ?\C-w "\
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*Character to pull next word from buffer into search string.")
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(defconst search-yank-line-char ?\C-y "\
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*Character to pull rest of line from buffer into search string.")
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(defconst search-ring-advance-char ?\M-n "\
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*Character to pull next (more recent) search string from the ring of same.")
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(defconst search-ring-retreat-char ?\M-p "\
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*Character to pull previous (older) search string from the ring of same.")
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(defconst search-exit-option t "\
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*Non-nil means random control characters terminate incremental search.")
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(defvar search-slow-window-lines 1 "\
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*Number of lines in slow search display windows.
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These are the short windows used during incremental search on slow terminals.
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Negative means put the slow search window at the top (normally it's at bottom)
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and the value is minus the number of lines.")
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(defvar search-slow-speed 1200 "\
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*Highest terminal speed at which to use \"slow\" style incremental search.
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This is the style where a one-line window is created to show the line
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that the search has reached.")
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(defconst search-upper-case t
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"*Non-nil means an upper-case letter as search input means case-sensitive.
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Any upper-case letter given explicitly as input to the incremental search
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has the effect of turning off `case-fold-search' for the rest of this search.
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Deleting the letter from the search string cancels the effect.")
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(fset 'search-forward-regexp 're-search-forward)
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(fset 'search-backward-regexp 're-search-backward)
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(defvar search-ring nil
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"List of recent non-regexp incremental searches.
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Each element is a cons cell of the form (STRING . UPPERCASE-FLAG).")
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(defvar regexp-search-ring nil
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"List of recent regexp incremental searches.
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Each element is a cons cell of the form (STRING . UPPERCASE-FLAG).")
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(defconst search-ring-max 16
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"*Maximum length of search ring before oldest elements are thrown away.")
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(defvar search-ring-yank-pointer nil
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"The tail of the search ring whose car is the last thing searched for.")
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(defvar regexp-search-ring-yank-pointer nil
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"The tail of the regular expression search ring whose car is the last
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thing searched for.")
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(defun isearch-forward ()
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"Do incremental search forward.
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As you type characters, they add to the search string and are found.
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Type Delete to cancel characters from end of search string.
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Type RET to exit, leaving point at location found.
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Type C-s to search again forward, C-r to search again backward.
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Type C-w to yank word from buffer onto end of search string and search for it.
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Type C-y to yank rest of line onto end of search string, etc.
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Type C-q to quote control character to search for it.
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Other control and meta characters terminate the search
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and are then executed normally.
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The above special characters are mostly controlled by parameters;
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do M-x apropos on search-.*-char to find them.
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C-g while searching or when search has failed
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cancels input back to what has been found successfully.
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C-g when search is successful aborts and moves point to starting point."
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(interactive)
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(isearch t))
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(define-key global-map "\C-s" 'isearch-forward)
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(defun isearch-forward-regexp ()
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"Do incremental search forward for regular expression.
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Like ordinary incremental search except that your input
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is treated as a regexp. See \\[isearch-forward] for more info."
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(interactive)
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(isearch t t))
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(define-key esc-map "\C-s" 'isearch-forward-regexp)
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(defun isearch-backward ()
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"Do incremental search backward.
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See \\[isearch-forward] for more information."
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(interactive)
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(isearch nil))
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(define-key global-map "\C-r" 'isearch-backward)
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(defun isearch-backward-regexp ()
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"Do incremental search backward for regular expression.
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Like ordinary incremental search except that your input
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is treated as a regexp. See \\[isearch-forward] for more info."
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(interactive)
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(isearch nil t))
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(define-key esc-map "\C-r" 'isearch-backward-regexp)
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;; This function does all the work of incremental search.
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;; The functions attached to ^R and ^S are trivial,
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;; merely calling this one, but they are always loaded by default
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;; whereas this file can optionally be autoloadable.
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;; This is the only entry point in this file.
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;; OP-FUN is a function to be called after each input character is processed.
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;; (It is not called after characters that exit the search.)
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(defun isearch (forward &optional regexp op-fun)
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(let ((search-string "")
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(search-message "")
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;; List of previous states during this search.
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(history nil)
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;; t means search is currently successful.
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(success t)
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;; Set once the search has wrapped around the end of the buffer.
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(wrapped nil)
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;; Nominal starting point for searching
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;; Usually this is the same as the opoint,
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;; but it is changed by wrapping
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;; and also by repeating the search.
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(barrier (point))
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;; Set temporarily when adding a character to a regexp
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;; enables it to match more rather than fewer places in the buffer.
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liberalized
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;; Set temporarily by yanking text into the search string.
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yank-flag
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(invalid-regexp nil)
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;; non-nil means an explicit uppercase letter seen in the input
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(uppercase-flag nil)
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;; Non-nil means start using a small window
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;; if the search moves outside what is currently on the frame.
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(slow-terminal-mode (and (<= baud-rate search-slow-speed)
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(> (window-height)
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(* 4 search-slow-window-lines))))
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;; t means a small window is currently in use.
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(small-window nil) ;if t, using a small window
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;; These variables preserve information from the small window
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;; through exit from the save-window-excursion.
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(found-point nil)
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(found-start nil)
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;; Point is at one end of the last match.
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;; This variable records the other end of that match.
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(other-end nil)
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;; Value of point at start of search,
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;; for moving the cursor back on quitting.
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(opoint (point))
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(inhibit-quit t) ;Prevent ^G from quitting, so we can read it.
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;; The frame we're working on; if this changes, we exit isearch.
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(frame (if (fboundp 'selected-frame) (selected-frame))))
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(isearch-push-state)
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(save-window-excursion
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(catch 'search-done
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(while t
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(or (and (numberp unread-command-char) (>= unread-command-char 0))
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(progn
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(or (input-pending-p)
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(isearch-message))
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(if (and slow-terminal-mode
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(not (or small-window (pos-visible-in-window-p))))
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(progn
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(setq small-window t)
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(setq found-point (point))
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(move-to-window-line 0)
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(let ((window-min-height 1))
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(split-window nil (if (< search-slow-window-lines 0)
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(1+ (- search-slow-window-lines))
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(- (window-height)
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(1+ search-slow-window-lines)))))
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(if (< search-slow-window-lines 0)
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(progn (vertical-motion (- 1 search-slow-window-lines))
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(set-window-start (next-window) (point))
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(set-window-hscroll (next-window)
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(window-hscroll))
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(set-window-hscroll (selected-window) 0))
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(other-window 1))
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(goto-char found-point)))))
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(let ((char (if quit-flag
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?\C-g
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(read-event))))
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(setq quit-flag nil liberalized nil yank-flag nil)
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(cond ((and (or (not (integerp char))
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(and (>= char 128)
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(not (= char search-ring-advance-char))
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(not (= char search-ring-retreat-char))))
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search-exit-option)
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(setq unread-command-char char)
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(throw 'search-done t))
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;; If the user switches to a different frame, exit.
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((not (eq frame last-event-frame))
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(setq unread-command-char char)
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(throw 'search-done t))
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((eq char search-exit-char)
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;; RET means exit search normally.
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;; Except, if first thing typed, it means do nonincremental
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(if (= 0 (length search-string))
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(nonincremental-search forward regexp))
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(throw 'search-done t))
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((= char ?\C-g)
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;; ^G means the user tried to quit.
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(ding)
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(discard-input)
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(if success
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;; If search is successful, move back to starting point
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;; and really do quit.
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(progn (goto-char opoint)
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(signal 'quit nil))
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;; If search is failing, rub out until it is once more
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;; successful.
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(while (not success) (isearch-pop))))
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((or (eq char search-repeat-char)
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(eq char search-reverse-char))
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(if (eq forward (eq char search-repeat-char))
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;; C-s in forward or C-r in reverse.
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(if (equal search-string "")
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;; If search string is empty, use last one.
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(isearch-get-string-from-ring)
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;; If already have what to search for, repeat it.
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(or success
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(progn (goto-char (if forward (point-min) (point-max)))
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(setq wrapped t))))
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;; C-s in reverse or C-r in forward, change direction.
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(setq forward (not forward)))
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(setq barrier (point)) ; For subsequent \| if regexp.
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(setq success t)
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(or (equal search-string "")
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(progn
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;; If repeating a search that found an empty string,
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;; ensure we advance. Test history to make sure we
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;; actually have done a search already; otherwise,
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;; the match data will be random.
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(if (and (cdr history)
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(= (match-end 0) (match-beginning 0)))
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(forward-char (if forward 1 -1)))
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(isearch-search)))
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(isearch-push-state))
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((= char search-delete-char)
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;; Rubout means discard last input item and move point
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;; back. If buffer is empty, just beep.
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(if (null (cdr history))
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(ding)
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(isearch-pop)))
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((= char search-ring-advance-char)
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(isearch-pop)
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(if regexp
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(let ((length (length regexp-search-ring)))
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(if (zerop length)
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()
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(setq regexp-search-ring-yank-pointer
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(nthcdr (% (+ 1 (- length (length regexp-search-ring-yank-pointer)))
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length)
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regexp-search-ring))
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(isearch-get-string-from-ring)))
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(let ((length (length search-ring)))
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(if (zerop length)
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()
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(setq search-ring-yank-pointer
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(nthcdr (% (+ 1 (- length (length search-ring-yank-pointer)))
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length)
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search-ring))
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(isearch-get-string-from-ring))))
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(isearch-push-state)
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(isearch-search))
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((= char search-ring-retreat-char)
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(isearch-pop)
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(if regexp
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(let ((length (length regexp-search-ring)))
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(if (zerop length)
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()
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(setq regexp-search-ring-yank-pointer
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(nthcdr (% (+ (- length (length regexp-search-ring-yank-pointer))
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(1- length))
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length)
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regexp-search-ring))
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(isearch-get-string-from-ring)))
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(let ((length (length search-ring)))
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(if (zerop length)
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()
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(setq search-ring-yank-pointer
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(nthcdr (% (+ (- length (length search-ring-yank-pointer))
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(1- length))
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length)
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search-ring))
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(isearch-get-string-from-ring))))
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(isearch-push-state)
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(isearch-search))
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(t
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(cond ((or (eq char search-yank-word-char)
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(eq char search-yank-line-char))
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;; ^W means gobble next word from buffer.
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;; ^Y means gobble rest of line from buffer.
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(let ((word (save-excursion
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(and (not forward) other-end
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(goto-char other-end))
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(buffer-substring
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(point)
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(save-excursion
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(if (eq char search-yank-line-char)
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(end-of-line)
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(forward-word 1))
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(point))))))
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(if regexp
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(setq word (regexp-quote word)))
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(setq search-string (concat search-string word)
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search-message
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(concat search-message
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(mapconcat 'text-char-description
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word ""))
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;; Don't move cursor in reverse search.
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yank-flag t)))
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;; Any other control char =>
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;; unread it and exit the search normally.
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((and search-exit-option
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(/= char search-quote-char)
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(or (>= char ?\177)
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(and (< char ? )
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(/= char ?\t)
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(/= char ?\n))))
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(setq unread-command-char char)
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(throw 'search-done t))
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(t
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;; Any other character => add it to the
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;; search string and search.
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(cond ((= char search-quote-char)
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(setq char (read-quoted-char
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(isearch-message t))))
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((= char ?\r)
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;; RET translates to newline.
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(setq char ?\n)))
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(setq search-string (concat search-string
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(char-to-string char))
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search-message (concat search-message
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(text-char-description char))
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uppercase-flag (or uppercase-flag
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(not (= char (downcase char)))))))
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(if (and (not success)
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;; unsuccessful regexp search may become
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;; successful by addition of characters which
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;; make search-string valid
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(not regexp))
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nil
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;; Check for chars that can make a regexp more liberal.
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;; They can make a regexp match sooner
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;; or make it succeed instead of failing.
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;; So go back to place last successful search started
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;; or to the last ^S/^R (barrier), whichever is nearer.
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(and regexp history
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(cond ((and (memq char '(?* ??))
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;; Don't treat *, ? as special
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;; within [] or after \.
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(not (nth 6 (car history))))
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(setq liberalized t)
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;; This used to use element 2
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;; in a reverse search, but it seems that 5
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;; (which is the end of the old match)
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;; is better in that case too.
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(let ((cs (nth 5 ; old other-end.
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(car (cdr history)))))
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;; (car history) is after last search;
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;; (car (cdr history)) is from before it.
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(setq cs (or cs barrier))
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(goto-char
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(if forward
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(max cs barrier)
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(min cs barrier)))))
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((eq char ?\|)
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(setq liberalized t)
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(goto-char barrier))))
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;; Turn off case-sensitivity if string requests it.
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(let ((case-fold-search
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(and case-fold-search
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(not (and uppercase-flag
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search-upper-case)))))
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;; In reverse search, adding stuff at
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;; the end may cause zero or many more chars to be
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;; matched, in the string following point.
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;; Allow all those possibilities without moving point as
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;; long as the match does not extend past search origin.
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(if (and (not forward) (not liberalized)
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(condition-case ()
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(looking-at (if regexp search-string
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(regexp-quote search-string)))
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(error nil))
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(or yank-flag
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;; Used to have (min opoint barrier)
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;; instead of barrier.
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;; This lost when wrapping.
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(<= (match-end 0) barrier)))
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(setq success t invalid-regexp nil
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other-end (match-end 0))
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;; Not regexp, not reverse, or no match at point.
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(if (and other-end (not liberalized))
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(goto-char (if forward other-end
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;; Used to have opoint inside the min.
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;; This lost when wrapping.
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(min barrier (1+ other-end)))))
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(isearch-search))))
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(isearch-push-state))))
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(if op-fun (funcall op-fun))))
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(setq found-start (window-start (selected-window)))
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(setq found-point (point)))
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(if (> (length search-string) 0)
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(if (and regexp (not (member search-string regexp-search-ring)))
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(progn
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(setq regexp-search-ring (cons (cons search-string uppercase-flag)
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regexp-search-ring)
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regexp-search-ring-yank-pointer regexp-search-ring)
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(if (> (length regexp-search-ring) search-ring-max)
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(setcdr (nthcdr (1- search-ring-max) regexp-search-ring) nil)))
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(if (not (member search-string search-ring))
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(progn
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(setq search-ring (cons (cons search-string uppercase-flag)
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search-ring)
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search-ring-yank-pointer search-ring)
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(if (> (length search-ring) search-ring-max)
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(setcdr (nthcdr (1- search-ring-max) search-ring) nil))))))
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;; If we displayed a single-line window, set point in this window.
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(if small-window
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(goto-char found-point))
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;; If there was movement, mark the starting position.
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;; Maybe should test difference between and set mark iff > threshold.
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(if (/= (point) opoint)
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(push-mark opoint)
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(message ""))
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(or small-window
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;; Exiting the save-window-excursion clobbers this; restore it.
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(set-window-start (selected-window) found-start t))))
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(defun isearch-message (&optional c-q-hack ellipsis)
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;; If about to search, and previous search regexp was invalid,
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;; check that it still is. If it is valid now,
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;; let the message we display while searching say that it is valid.
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(and invalid-regexp ellipsis
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(condition-case ()
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(progn (re-search-forward search-string (point) t)
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(setq invalid-regexp nil))
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(error nil)))
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;; If currently failing, display no ellipsis.
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(or success (setq ellipsis nil))
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(let ((m (concat (if success "" "failing ")
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(if wrapped "wrapped ")
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(if (or (not case-fold-search)
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(and uppercase-flag search-upper-case))
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"case-sensitive ")
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(if regexp "regexp " "")
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"I-search"
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(if forward ": " " backward: ")
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search-message
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(if c-q-hack "^Q" "")
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(if invalid-regexp
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(concat " [" invalid-regexp "]")
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""))))
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(aset m 0 (upcase (aref m 0)))
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(let ((cursor-in-echo-area ellipsis))
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(if c-q-hack m (message "%s" m)))))
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;; Get the search string from the "front" of the ring of previous searches.
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(defun isearch-get-string-from-ring ()
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(let ((elt (car (if regexp
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(or regexp-search-ring-yank-pointer regexp-search-ring)
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(or search-ring-yank-pointer search-ring)))))
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;; ELT describes the most recent search or where we have rotated the ring.
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(if elt
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(setq search-string (car elt)
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uppercase-flag (cdr elt))
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(setq search-string "" uppercase-flag nil)))
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;; Let's give this one the benefit of the doubt.
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(setq invalid-regexp nil)
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(setq search-message (mapconcat 'text-char-description search-string "")))
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(defun isearch-pop ()
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(setq history (cdr history))
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(let ((cmd (car history)))
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(setq search-string (car cmd)
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search-message (car (cdr cmd))
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success (nth 3 cmd)
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forward (nth 4 cmd)
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other-end (nth 5 cmd)
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invalid-regexp (nth 6 cmd)
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wrapped (nth 7 cmd)
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barrier (nth 8 cmd)
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uppercase-flag (nth 9 cmd))
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(goto-char (car (cdr (cdr cmd))))))
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(defun isearch-push-state ()
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(setq history (cons (list search-string search-message (point)
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success forward other-end invalid-regexp
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wrapped barrier uppercase-flag)
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history)))
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(defun isearch-search ()
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(let ((case-fold-search
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(and case-fold-search
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(not (and uppercase-flag
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search-upper-case)))))
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(isearch-message nil t)
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(condition-case lossage
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(let ((inhibit-quit nil))
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(if regexp (setq invalid-regexp nil))
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(setq success
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(funcall
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(if regexp
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(if forward 're-search-forward 're-search-backward)
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(if forward 'search-forward 'search-backward))
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search-string nil t))
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(if success
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(setq other-end
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(if forward (match-beginning 0) (match-end 0)))))
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(quit (setq unread-command-char ?\C-g)
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(setq success nil))
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(invalid-regexp (setq invalid-regexp (car (cdr lossage)))
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(if (string-match "\\`Premature \\|\\`Unmatched \\|\\`Invalid "
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invalid-regexp)
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(setq invalid-regexp "incomplete input"))))
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(if success
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nil
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;; Ding if failed this time after succeeding last time.
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(and (nth 3 (car history))
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(ding))
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(goto-char (nth 2 (car history))))))
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;; This is called from incremental-search
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;; if the first input character is the exit character.
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;; The interactive-arg-reader uses free variables `forward' and `regexp'
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;; which are bound by `incremental-search'.
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;; We store the search string in `search-string'
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;; which has been bound already by `incremental-search'
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;; so that, when we exit, it is copied into `search-last-string'.
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(defun nonincremental-search (forward regexp)
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(let (message char function string inhibit-quit)
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(let ((cursor-in-echo-area t))
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;; Prompt assuming not word search,
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(setq message (if regexp
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(if forward "Regexp search: "
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"Regexp search backward: ")
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(if forward "Search: " "Search backward: ")))
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(message "%s" message)
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;; Read 1 char and switch to word search if it is ^W.
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(setq char (read-event)))
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(if (and (numberp char) (eq char search-yank-word-char))
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(setq message (if forward "Word search: " "Word search backward: "))
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;; Otherwise let that 1 char be part of the search string.
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|
(setq unread-command-char char))
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(setq function
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(if (eq char search-yank-word-char)
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(if forward 'word-search-forward 'word-search-backward)
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|
(if regexp
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(if forward 're-search-forward 're-search-backward)
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(if forward 'search-forward 'search-backward))))
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;; Read the search string with corrected prompt.
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(setq string (read-string message))
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;; Empty means use default.
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(if (= 0 (length string))
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(setq string search-last-string)
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;; Set last search string now so it is set even if we fail.
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(setq search-last-string string))
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;; Since we used the minibuffer, we should be available for redo.
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(setq command-history (cons (list function string) command-history))
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;; Go ahead and search.
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(funcall function string)))
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;;; isearch.el ends here
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