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| 1 | ;;; isearch-multi.el --- isearch extensions for multi-buffer search | ||
| 2 | |||
| 3 | ;; Copyright (C) 2007, 2008 Free Software Foundation, Inc. | ||
| 4 | |||
| 5 | ;; Author: Juri Linkov <juri@jurta.org> | ||
| 6 | ;; Keywords: matching | ||
| 7 | |||
| 8 | ;; This file is part of GNU Emacs. | ||
| 9 | |||
| 10 | ;; GNU Emacs is free software: you can redistribute it and/or modify | ||
| 11 | ;; it under the terms of the GNU General Public License as published by | ||
| 12 | ;; the Free Software Foundation, either version 3 of the License, or | ||
| 13 | ;; (at your option) any later version. | ||
| 14 | |||
| 15 | ;; GNU Emacs is distributed in the hope that it will be useful, | ||
| 16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 18 | ;; GNU General Public License for more details. | ||
| 19 | |||
| 20 | ;; You should have received a copy of the GNU General Public License | ||
| 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. | ||
| 22 | |||
| 23 | ;;; Commentary: | ||
| 24 | |||
| 25 | ;; This file adds more dimensions to the search space. It implements | ||
| 26 | ;; various features that extend isearch. One of them is an ability to | ||
| 27 | ;; search through multiple buffers. | ||
| 28 | |||
| 29 | ;;; Code: | ||
| 30 | |||
| 31 | ;;; Search multiple buffers | ||
| 32 | |||
| 33 | (defgroup isearch-buffers nil | ||
| 34 | "Using isearch to search through multiple buffers." | ||
| 35 | :version "23.1" | ||
| 36 | :group 'isearch) | ||
| 37 | |||
| 38 | (defcustom isearch-buffers-multi t | ||
| 39 | "Non-nil enables searching multiple related buffers, in certain modes." | ||
| 40 | :type 'boolean | ||
| 41 | :version "23.1" | ||
| 42 | :group 'isearch-buffers) | ||
| 43 | |||
| 44 | (defcustom isearch-buffers-pause t | ||
| 45 | "A choice defining where to pause the search. | ||
| 46 | If the value is nil, don't pause before going to the next buffer. | ||
| 47 | If the value is `initial', pause only after a failing search in the | ||
| 48 | initial buffer. | ||
| 49 | If t, pause in all buffers that contain the search string." | ||
| 50 | :type '(choice | ||
| 51 | (const :tag "Don't pause" nil) | ||
| 52 | (const :tag "Only in initial buffer" initial) | ||
| 53 | (const :tag "All buffers" t)) | ||
| 54 | :version "23.1" | ||
| 55 | :group 'isearch-buffers) | ||
| 56 | |||
| 57 | ;;;###autoload | ||
| 58 | (defvar isearch-buffers-current-buffer nil | ||
| 59 | "The buffer where the search is currently searching. | ||
| 60 | The value is nil when the search still is in the initial buffer.") | ||
| 61 | |||
| 62 | ;;;###autoload | ||
| 63 | (defvar isearch-buffers-next-buffer-function nil | ||
| 64 | "Function to call to get the next buffer to search. | ||
| 65 | |||
| 66 | When this variable is set to a function that returns a buffer, then | ||
| 67 | after typing another \\[isearch-forward] or \\[isearch-backward] \ | ||
| 68 | at a failing search, the search goes | ||
| 69 | to the next buffer in the series and continues searching for the | ||
| 70 | next occurrence. | ||
| 71 | |||
| 72 | The first argument of this function is the current buffer where the | ||
| 73 | search is currently searching. It defines the base buffer relative to | ||
| 74 | which this function should find the next buffer. When the isearch | ||
| 75 | direction is backward (when `isearch-forward' is nil), this function | ||
| 76 | should return the previous buffer to search. If the second argument of | ||
| 77 | this function WRAP is non-nil, then it should return the first buffer | ||
| 78 | in the series; and for the backward search, it should return the last | ||
| 79 | buffer in the series.") | ||
| 80 | |||
| 81 | ;;;###autoload | ||
| 82 | (define-minor-mode isearch-buffers-minor-mode | ||
| 83 | "Minor mode for using isearch to search through multiple buffers. | ||
| 84 | With arg, turn isearch-buffers minor mode on if arg is positive, off otherwise." | ||
| 85 | :group 'isearch-buffers ;; :lighter " X" | ||
| 86 | (if isearch-buffers-minor-mode | ||
| 87 | (progn | ||
| 88 | (add-hook 'isearch-mode-hook 'isearch-buffers-init nil t) | ||
| 89 | (set (make-local-variable 'isearch-search-fun-function) | ||
| 90 | 'isearch-buffers-search-fun) | ||
| 91 | (set (make-local-variable 'isearch-wrap-function) | ||
| 92 | 'isearch-buffers-wrap) | ||
| 93 | (set (make-local-variable 'isearch-push-state-function) | ||
| 94 | 'isearch-buffers-push-state)) | ||
| 95 | (remove-hook 'isearch-mode-hook 'isearch-buffers-init t) | ||
| 96 | (kill-local-variable 'isearch-search-fun-function) | ||
| 97 | (kill-local-variable 'isearch-wrap-function) | ||
| 98 | (kill-local-variable 'isearch-push-state-function))) | ||
| 99 | |||
| 100 | (defun isearch-buffers-init () | ||
| 101 | "Set up isearch to search multiple buffers. | ||
| 102 | Intended to be added to `isearch-mode-hook'." | ||
| 103 | (setq isearch-buffers-current-buffer nil)) | ||
| 104 | |||
| 105 | (defun isearch-buffers-search-fun () | ||
| 106 | "Return the proper search function, for isearch in multiple buffers." | ||
| 107 | (lambda (string bound noerror) | ||
| 108 | (let ((search-fun | ||
| 109 | ;; Use standard functions to search within one buffer | ||
| 110 | (cond | ||
| 111 | (isearch-word | ||
| 112 | (if isearch-forward 'word-search-forward 'word-search-backward)) | ||
| 113 | (isearch-regexp | ||
| 114 | (if isearch-forward 're-search-forward 're-search-backward)) | ||
| 115 | (t | ||
| 116 | (if isearch-forward 'search-forward 'search-backward)))) | ||
| 117 | found buffer) | ||
| 118 | (or | ||
| 119 | ;; 1. First try searching in the initial buffer | ||
| 120 | (let ((res (funcall search-fun string bound noerror))) | ||
| 121 | ;; Reset wrapping for all-buffers pause after successful search | ||
| 122 | (if (and res (eq isearch-buffers-pause t)) | ||
| 123 | (setq isearch-buffers-current-buffer nil)) | ||
| 124 | res) | ||
| 125 | ;; 2. If the above search fails, start visiting next/prev buffers | ||
| 126 | ;; successively, and search the string in them. Do this only | ||
| 127 | ;; when bound is nil (i.e. not while lazy-highlighting search | ||
| 128 | ;; strings in the current buffer). | ||
| 129 | (when (and (not bound) isearch-buffers-multi) | ||
| 130 | ;; If no-pause or there was one attempt to leave the current buffer | ||
| 131 | (if (or (null isearch-buffers-pause) | ||
| 132 | (and isearch-buffers-pause isearch-buffers-current-buffer)) | ||
| 133 | (condition-case nil | ||
| 134 | (progn | ||
| 135 | (while (not found) | ||
| 136 | ;; Find the next buffer to search | ||
| 137 | (setq buffer (funcall isearch-buffers-next-buffer-function | ||
| 138 | buffer)) | ||
| 139 | (with-current-buffer buffer | ||
| 140 | (goto-char (if isearch-forward (point-min) (point-max))) | ||
| 141 | (setq isearch-barrier (point) isearch-opoint (point)) | ||
| 142 | ;; After visiting the next/prev buffer search the | ||
| 143 | ;; string in it again, until the function in | ||
| 144 | ;; isearch-buffers-next-buffer-function raises an error | ||
| 145 | ;; at the beginning/end of the buffer sequence. | ||
| 146 | (setq found (funcall search-fun string bound noerror)))) | ||
| 147 | ;; Set buffer for isearch-search-string to switch | ||
| 148 | (if buffer (setq isearch-buffers-current-buffer buffer)) | ||
| 149 | ;; Return point of the new search result | ||
| 150 | found) | ||
| 151 | ;; Return nil when isearch-buffers-next-buffer-function fails | ||
| 152 | (error nil)) | ||
| 153 | (signal 'search-failed (list string "Repeat for next buffer")))))))) | ||
| 154 | |||
| 155 | (defun isearch-buffers-wrap () | ||
| 156 | "Wrap the multiple buffers search when search is failed. | ||
| 157 | Switch buffer to the first buffer for a forward search, | ||
| 158 | or to the last buffer for a backward search. | ||
| 159 | Set `isearch-buffers-current-buffer' to the current buffer to display | ||
| 160 | the isearch suffix message [initial buffer] only when isearch leaves | ||
| 161 | the initial buffer." | ||
| 162 | (if (or (null isearch-buffers-pause) | ||
| 163 | (and isearch-buffers-pause isearch-buffers-current-buffer)) | ||
| 164 | (progn | ||
| 165 | (switch-to-buffer | ||
| 166 | (setq isearch-buffers-current-buffer | ||
| 167 | (funcall isearch-buffers-next-buffer-function | ||
| 168 | (current-buffer) t))) | ||
| 169 | (goto-char (if isearch-forward (point-min) (point-max)))) | ||
| 170 | (setq isearch-buffers-current-buffer (current-buffer)) | ||
| 171 | (setq isearch-wrapped nil))) | ||
| 172 | |||
| 173 | (defun isearch-buffers-push-state () | ||
| 174 | "Save a function restoring the state of multiple buffers search. | ||
| 175 | Save the current buffer to the additional state parameter in the | ||
| 176 | search status stack." | ||
| 177 | `(lambda (cmd) | ||
| 178 | (isearch-buffers-pop-state cmd ,(current-buffer)))) | ||
| 179 | |||
| 180 | (defun isearch-buffers-pop-state (cmd buffer) | ||
| 181 | "Restore the multiple buffers search state. | ||
| 182 | Switch to the buffer restored from the search status stack." | ||
| 183 | (unless (equal buffer (current-buffer)) | ||
| 184 | (switch-to-buffer (setq isearch-buffers-current-buffer buffer)))) | ||
| 185 | |||
| 186 | (provide 'isearch-multi) | ||
| 187 | |||
| 188 | ;; arch-tag: a6d38ffa-4d14-4e39-8ac6-46af9d6a6773 | ||
| 189 | ;;; isearch-multi.el ends here | ||