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+;; 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. 
+;;
+
+;; Installation:
+;;
+;; Place the following in your .emacs file:
+;; 
+;; ;; redefines dired-get-filename as a switch function
+;;
+;; (require 'advice)
+;; (defadvice dired-get-filename (around check-mode activate)
+;;   "Use an alternative function in Locate mode"
+;;   (cond ((eq major-mode 'locate-mode)
+;;        (setq ad-return-value (locate-get-filename)))
+;;       (t
+;;        ad-do-it)))
+;;
+;; DOS and WINDOWS Users:
+;;
+;;;;; 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.")
+
+;; 32 is the ASCII code for SPACE character
+(defconst locate-indentation-string
+  (make-string locate-filename-indentation 32)
+ "The indentation string 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))))
+  (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)
+      
+      (while (progn
+               (locate-set-indentation)
+               (locate-set-properties)
+               (zerop (forward-line)))))))
+
+(defun locate-set-indentation ()
+  (save-excursion
+    (beginning-of-line)
+    (insert locate-indentation-string)))
+
+(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"))
+    
+    (insert locate-indentation-string 
+            (apply 'format locate-format-string (reverse locate-format-args)))
+    
+    (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