locate.el 11.8 KB
Newer Older
Richard M. Stallman's avatar
Richard M. Stallman committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266
;; Locate.el: interface to the locate command

;; Copyright (C) 1996 Free Software Foundation, Inc.

;; Author: Peter Breton <pbreton@i-kinetics.com>

;; 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 2, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; Search a database of files and use dired commands on
;; the result. 
;;

;;;;; Building a database of files ;;;;;;;;;
;; 
;; You can create a simple files database with a port of the Unix find command
;; and one of the various Windows NT various scheduling utilities,
;; for example the AT command from the NT Resource Kit, WinCron which is
;; included with Microsoft FrontPage, or the shareware NTCron program.
;;
;; To set up a function which searches the files database, do something
;; like this:
;; 
;; (defvar locate-fcodes-file       (concat my-home "/fcodes"))
;; (defvar locate-make-command-line 'nt-locate-make-command-line)
;; 
;; (defun nt-locate-make-command-line (arg)
;;  (cons "grep"
;;        (mapconcat 'identity
;; 		  (list "-i" arg locate-fcodes-file)
;; 		  " ")))
;;
;;;;;;;; ADVICE For dired-make-relative: ;;;;;;;;;
;; 
;; For certain dired commands to work right, you should also include the
;; following in your _emacs/.emacs:
;; 
;; (defadvice dired-make-relative (before set-no-error activate)
;;   "For locate mode and Windows, don't return errors"
;;   (if (and (eq   major-mode  'locate-mode)
;; 	   (memq system-type (list 'windows-nt 'ms-dos)))
;;       (ad-set-arg 2 t)
;;     ))
;;
;; Otherwise, dired-make-relative will give error messages like
;; "FILENAME: not in directory tree growing at /"

;;; Commentary:
;;
;; Locate.el provides an interface to a program which searches a
;; database of file names. By default, this program is the GNU locate
;; command, but it could also be the BSD-style find command, or even a
;; user specified command.
;;
;; To use the BSD-style "fast find", or any other shell command of the
;; form 
;;
;;   SHELLPROGRAM  Name-to-find
;;
;; set the variable locate-command in your .emacs file.
;;
;;   To use a more complicated expression, create a function which 
;; takes a string (the name to find) as input and returns a cons
;; pair: the car should be the command to be executed, the cdr
;; should be the arguments, concatenated into a string (including
;; the name to find). Then do
;;
;; (setq locate-make-command-line 'my-locate-command-line) 
;;
;; in your .emacs, using the name of your function in place of
;; my-locate-command-line
;;
;; You should make sure that whichever command you use works correctly
;; from a shell prompt. GNU locate and BSD find expect the file databases
;; to either be in standard places or located via environment variables.
;; If the latter, make sure these environment variables are set in
;; your emacs process
;;
;; Locate-mode assumes that each line output from the locate-command
;; consists exactly of a file name, possibly preceded or trailed by
;; whitespace. If your file database has other information on the line (for
;; example, the file size), you will need to redefine the function 
;; locate-get-file-positions to return a list consisting of the first
;; character in the file name and the last character in the file name.
;;
;; To use locate-mode, simply type M-x locate and then the string
;; you wish to find. You can use almost all of the dired commands in
;; the resulting *Locate* buffer.  It is worth noting that your commands
;; do not, of course, affect the file database. For example, if you
;; compress a file in the locate buffer, the actual file will be
;; compressed, but the entry in the file database will not be
;; affected. Consequently, the database and the filesystem will be out
;; of sync until the next time the database is updated
;;
;; The command locate-with-filter keeps only lines matching a
;; regular expression; this is often useful to constrain a big search.
;;

;;; Code:

(eval-when-compile
  (require 'dired))

;; Variables
(defvar locate-command "locate"
  "*The executable program used to search a database of files.")

(defvar locate-history-list nil
  "The history list used by the \\[locate] command.")

(defvar locate-make-command-line 'locate-default-make-command-line
  "*Function used to create the locate command line.")

(defvar locate-buffer-name "*Locate*"
  "*Name of the buffer to show results from the \\[locate] command.")

(defvar locate-fcodes-file nil
  "*Database of filenames.")

(defvar locate-mouse-face 'highlight
  "*Face used to highlight locate entries.")

(defvar locate-header-face 'region
  "*Face used to highlight the locate header.")

(defvar locate-current-filter nil)

;; Functions

(defun locate-default-make-command-line (search-string)
  (cons locate-command search-string))

;;;### autoload
(defun locate (search-string &optional filter)
  "Run the \\[locate] command, putting results in `*Locate*' buffer."
  (interactive
      (list (read-from-minibuffer "Locate: " nil nil
		  nil 'locate-history-list)))
  (let* ((pop-up-windows 1)
	 (locate-cmd-list (funcall locate-make-command-line search-string))
	 (locate-cmd (car locate-cmd-list))
	 (locate-cmd-args (cdr locate-cmd-list))
	 (locate-proc)
	)
    
    ;; Find the Locate buffer
    (if (not (string-equal (buffer-name) locate-buffer-name))
       (switch-to-buffer-other-window locate-buffer-name))

    (locate-mode)
    (erase-buffer)

    (setq locate-current-filter filter)

    (call-process locate-cmd nil t nil locate-cmd-args)
    (if filter
	(locate-filter-output filter))

    (locate-do-setup)
 )
)

;;;### autoload
(defun locate-with-filter (search-string filter)
  "Run the locate command with a filter."
  (interactive
      (list (read-from-minibuffer "Locate: " nil nil
		  nil 'locate-history-list)
            (read-from-minibuffer "Filter: " nil nil
		  nil 'grep-history)))
  (locate search-string filter))

(defun locate-filter-output (filter)
  "Filter output from the locate command."
  (goto-char (point-min))
  (delete-non-matching-lines (regexp-quote filter)))

(defvar locate-mode-map nil
  "Local keymap for Locate mode buffers.")
(if locate-mode-map
    nil

   (require 'dired)

   (setq locate-mode-map (copy-keymap dired-mode-map))

   ;; Undefine Useless Dired Menu bars
   (define-key locate-mode-map [menu-bar Dired]   'undefined)
   (define-key locate-mode-map [menu-bar subdir]  'undefined)

   (define-key locate-mode-map [menu-bar mark executables] 'undefined)
   (define-key locate-mode-map [menu-bar mark directory]   'undefined)
   (define-key locate-mode-map [menu-bar mark directories] 'undefined)
   (define-key locate-mode-map [menu-bar mark symlinks]    'undefined)

   (define-key locate-mode-map [mouse-2] 'mouse-locate-view-file)
   (define-key locate-mode-map "\C-ct"   'locate-tags)

   (define-key locate-mode-map "U"       'dired-unmark-all-files-no-query)
)

;; This variable is used to indent the lines and then to search for
;; the file name
(defconst locate-filename-indentation 4
 "The amount of indentation for each file.")

(defun locate-get-file-positions ()
  (save-excursion
     (end-of-line)
     (let ((eol (point)))
       (beginning-of-line)

       ;; Assumes names end at the end of the line
       (forward-char locate-filename-indentation)
       (list (point) eol))))

;; From SQL-mode
(defun current-line ()
  "Return the current line number, as an integer."
  (interactive)
  (+ (count-lines (point-min) (point))
     (if (eq (current-column) 0)
	 1
       0)))

(defun locate-get-filename ()
  (let ((pos    (locate-get-file-positions))
	(lineno (current-line)))
    (and (not (eq lineno 1)) 
	 (not (eq lineno 2)) 
	 (buffer-substring (elt pos 0) (elt pos 1)))))

(defun mouse-locate-view-file (event)
  "In Locate mode, view a file, using the mouse."
  (interactive "@e") 
  (save-excursion
    (goto-char (posn-point (event-start event)))
      (view-file (locate-get-filename))))

;; Define a mode for locate
;; Default directory is set to "/" so that dired commands, which
;; expect to be in a tree, will work properly
(defun locate-mode ()
  "Major mode for the `*Locate*' buffer made by \\[locate]."
  (kill-all-local-variables)
  (use-local-map             locate-mode-map)
  (setq major-mode          'locate-mode
        mode-name           "Locate"
        default-directory   "/"
	dired-subdir-alist  (list (cons "/" (point-min-marker))))
267 268 269 270 271 272 273
  (make-local-variable 'dired-move-to-filename-regexp)
  (setq dired-move-to-filename-regexp
	(make-string locate-filename-indentation ?\ ))
  (make-local-variable 'dired-actual-switches)
  (setq dired-actual-switches "")
  (make-local-variable 'dired-permission-flags-regexp)
  (setq dired-permission-flags-regexp "^\\(    \\)")
Richard M. Stallman's avatar
Richard M. Stallman committed
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292
  (run-hooks 'locate-mode-hook))

(defun locate-do-setup ()
  (let ((search-string (car locate-history-list)))
    (goto-char (point-min))
    (save-excursion
      
      ;; Nothing returned from locate command?
      (if (eobp)
	  (progn
	    (kill-buffer locate-buffer-name)
	    (delete-window)
	    (if locate-current-filter
		(error "Locate: no match for %s in database using filter %s"
		       search-string locate-current-filter)
	    (error "Locate: no match for %s in database" search-string))))

      (locate-insert-header search-string)
      
293 294 295 296
      (while (not (eobp))
	(insert-char ?\  locate-filename-indentation t)
	(locate-set-properties)
	(forward-line 1)))))
Richard M. Stallman's avatar
Richard M. Stallman committed
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338

(defun locate-set-properties ()
  (save-excursion
    (let ((pos (locate-get-file-positions)))
      (add-text-properties (elt pos 0) (elt pos 1)
			   (list 'mouse-face locate-mouse-face)))))

(defun locate-insert-header (search-string)
  (let ((locate-format-string "Matches for %s")
	(locate-regexp-match
	 (concat " *Matches for \\(" (regexp-quote search-string) "\\)"))
	(locate-format-args (list search-string))
	)
  
    (if locate-fcodes-file
	(setq locate-format-string
	      (concat locate-format-string " in %s")
	      locate-regexp-match
	      (concat locate-regexp-match
		      " in \\("
		      (regexp-quote locate-fcodes-file)
		      "\\)")
	      locate-format-args
	      (append (list locate-fcodes-file) locate-format-args)))

    (if locate-current-filter
	(setq locate-format-string
	      (concat locate-format-string " using filter %s")
	      locate-regexp-match
	      (concat locate-regexp-match
		      " using filter "
		      "\\("
		      (regexp-quote locate-current-filter)
		      "\\)")
	      locate-format-args
	      (append (list locate-current-filter) locate-format-args)))
	
    (setq locate-format-string
	  (concat locate-format-string ": \n\n")
	  locate-regexp-match
	  (concat locate-regexp-match ": \n"))
    
339
    (insert (apply 'format locate-format-string (reverse locate-format-args)))
Richard M. Stallman's avatar
Richard M. Stallman committed
340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365
    
    (save-excursion
      (goto-char (point-min))
      (if (not (looking-at locate-regexp-match))
	  nil
	(add-text-properties (match-beginning 1) (match-end 1)
			     (list 'face locate-header-face))
	(and (match-beginning 2)
	     (add-text-properties (match-beginning 2) (match-end 2)
				  (list 'face locate-header-face)))
	(and (match-beginning 3)
	     (add-text-properties (match-beginning 3) (match-end 3)
				  (list 'face locate-header-face)))
	))))

(defun locate-tags ()
  "Visit a tags table in `*Locate*' mode."
  (interactive)
  (let ((tags-table (locate-get-filename)))
   (if (y-or-n-p (format "Visit tags table %s? " tags-table)) 
     (visit-tags-table tags-table)
    nil)))

(provide 'locate)

;;; locate.el ends here