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393 lines
13 KiB
EmacsLisp
393 lines
13 KiB
EmacsLisp
;;; locate.el --- interface to the locate command
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;; Copyright (C) 1996, 1998 Free Software Foundation, Inc.
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;; Author: Peter Breton <pbreton@cs.umb.edu>
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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 the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Search a database of files and use dired commands on
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;; the result.
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;;
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;;;;; Building a database of files ;;;;;;;;;
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;;
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;; You can create a simple files database with a port of the Unix find command
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;; and one of the various Windows NT various scheduling utilities,
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;; for example the AT command from the NT Resource Kit, WinCron which is
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;; included with Microsoft FrontPage, or the shareware NTCron program.
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;;
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;; To set up a function which searches the files database, do something
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;; like this:
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;;
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;; (defvar locate-fcodes-file "c:/users/peter/fcodes")
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;; (defvar locate-make-command-line 'nt-locate-make-command-line)
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;;
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;; (defun nt-locate-make-command-line (arg)
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;; (list "grep" "-i" arg locate-fcodes-file))
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;;
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;;;;;;;; ADVICE For dired-make-relative: ;;;;;;;;;
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;;
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;; For certain dired commands to work right, you should also include the
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;; following in your _emacs/.emacs:
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;;
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;; (defadvice dired-make-relative (before set-no-error activate)
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;; "For locate mode and Windows, don't return errors"
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;; (if (and (eq major-mode 'locate-mode)
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;; (memq system-type (list 'windows-nt 'ms-dos)))
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;; (ad-set-arg 2 t)
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;; ))
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;;
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;; Otherwise, `dired-make-relative' will give error messages like
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;; "FILENAME: not in directory tree growing at /"
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;;; Commentary:
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;;
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;; Locate.el provides an interface to a program which searches a
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;; database of file names. By default, this program is the GNU locate
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;; command, but it could also be the BSD-style find command, or even a
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;; user specified command.
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;;
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;; To use the BSD-style "fast find", or any other shell command of the
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;; form
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;;
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;; SHELLPROGRAM Name-to-find
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;;
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;; set the variable `locate-command' in your .emacs file.
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;;
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;; To use a more complicated expression, create a function which
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;; takes a string (the name to find) as input and returns a list.
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;; The first element should be the command to be executed, the remaining
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;; elements should be the arguments (including the name to find). Then put
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;;
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;; (setq locate-make-command-line 'my-locate-command-line)
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;;
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;; in your .emacs, using the name of your function in place of
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;; my-locate-command-line.
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;;
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;; You should make sure that whichever command you use works correctly
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;; from a shell prompt. GNU locate and BSD find expect the file databases
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;; to either be in standard places or located via environment variables.
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;; If the latter, make sure these environment variables are set in
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;; your emacs process.
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;;
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;; Locate-mode assumes that each line output from the locate-command
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;; consists exactly of a file name, possibly preceded or trailed by
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;; whitespace. If your file database has other information on the line (for
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;; example, the file size), you will need to redefine the function
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;; `locate-get-file-positions' to return a list consisting of the first
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;; character in the file name and the last character in the file name.
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;;
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;; To use locate-mode, simply type M-x locate and then the string
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;; you wish to find. You can use almost all of the dired commands in
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;; the resulting *Locate* buffer. It is worth noting that your commands
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;; do not, of course, affect the file database. For example, if you
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;; compress a file in the locate buffer, the actual file will be
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;; compressed, but the entry in the file database will not be
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;; affected. Consequently, the database and the filesystem will be out
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;; of sync until the next time the database is updated.
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;;
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;; The command `locate-with-filter' keeps only lines matching a
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;; regular expression; this is often useful to constrain a big search.
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;;
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;;; Code:
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(eval-when-compile
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(require 'dired))
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;; Variables
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(defvar locate-current-filter nil)
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(defgroup locate nil
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"Interface to the locate command."
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:prefix "locate-"
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:group 'external)
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(defcustom locate-command "locate"
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"*The executable program used to search a database of files."
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:type 'string
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:group 'locate)
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(defvar locate-history-list nil
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"The history list used by the \\[locate] command.")
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(defcustom locate-make-command-line 'locate-default-make-command-line
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"*Function used to create the locate command line."
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:type 'function
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:group 'locate)
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(defcustom locate-buffer-name "*Locate*"
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"*Name of the buffer to show results from the \\[locate] command."
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:type 'string
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:group 'locate)
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(defcustom locate-fcodes-file nil
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"*File name for the database of file names."
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:type '(choice file (const nil))
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:group 'locate)
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(defcustom locate-mouse-face 'highlight
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"*Face used to highlight locate entries."
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:type 'face
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:group 'locate)
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(defcustom locate-header-face 'underline
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"*Face used to highlight the locate header."
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:type 'face
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:group 'locate)
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(defcustom locate-update-command "updatedb"
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"The command used to update the locate database."
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:type 'string
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:group 'locate)
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;; Functions
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(defun locate-default-make-command-line (search-string)
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(list locate-command search-string))
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;;;###autoload
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(defun locate (search-string &optional filter)
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"Run the program `locate', putting results in `*Locate*' buffer."
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(interactive
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(list (read-from-minibuffer "Locate: " nil nil
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nil 'locate-history-list)))
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(let* ((locate-cmd-list (funcall locate-make-command-line search-string))
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(locate-cmd (car locate-cmd-list))
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(locate-cmd-args (cdr locate-cmd-list))
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)
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;; Find the Locate buffer
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(save-window-excursion
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(set-buffer (get-buffer-create locate-buffer-name))
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(locate-mode)
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(erase-buffer)
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(setq locate-current-filter filter)
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(apply 'call-process locate-cmd nil t nil locate-cmd-args)
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(and filter
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(locate-filter-output filter))
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(locate-do-setup)
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)
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(and (not (string-equal (buffer-name) locate-buffer-name))
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(switch-to-buffer-other-window locate-buffer-name))
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)
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)
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;;;###autoload
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(defun locate-with-filter (search-string filter)
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"Run the locate command with a filter."
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(interactive
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(list (read-from-minibuffer "Locate: " nil nil
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nil 'locate-history-list)
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(read-from-minibuffer "Filter: " nil nil
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nil 'grep-history)))
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(locate search-string filter))
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(defun locate-filter-output (filter)
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"Filter output from the locate command."
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(goto-char (point-min))
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(delete-non-matching-lines (regexp-quote filter)))
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(defvar locate-mode-map nil
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"Local keymap for Locate mode buffers.")
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(if locate-mode-map
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nil
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(require 'dired)
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(setq locate-mode-map (copy-keymap dired-mode-map))
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;; Undefine Useless Dired Menu bars
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(define-key locate-mode-map [menu-bar Dired] 'undefined)
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(define-key locate-mode-map [menu-bar subdir] 'undefined)
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(define-key locate-mode-map [menu-bar mark executables] 'undefined)
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(define-key locate-mode-map [menu-bar mark directory] 'undefined)
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(define-key locate-mode-map [menu-bar mark directories] 'undefined)
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(define-key locate-mode-map [menu-bar mark symlinks] 'undefined)
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(define-key locate-mode-map [mouse-2] 'mouse-locate-view-file)
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(define-key locate-mode-map "\C-ct" 'locate-tags)
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(define-key locate-mode-map "U" 'dired-unmark-all-files-no-query)
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)
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;; This variable is used to indent the lines and then to search for
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;; the file name
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(defconst locate-filename-indentation 4
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"The amount of indentation for each file.")
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(defun locate-get-file-positions ()
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(save-excursion
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(end-of-line)
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(let ((eol (point)))
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(beginning-of-line)
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;; Assumes names end at the end of the line
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(forward-char locate-filename-indentation)
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(list (point) eol))))
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;; From SQL-mode
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(defun locate-current-line-number ()
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"Return the current line number, as an integer."
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(+ (count-lines (point-min) (point))
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(if (eq (current-column) 0)
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1
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0)))
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(defun locate-get-filename ()
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(let ((pos (locate-get-file-positions))
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(lineno (locate-current-line-number)))
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(and (not (eq lineno 1))
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(not (eq lineno 2))
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(buffer-substring (elt pos 0) (elt pos 1)))))
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(defun mouse-locate-view-file (event)
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"In Locate mode, view a file, using the mouse."
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(interactive "@e")
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(save-excursion
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(goto-char (posn-point (event-start event)))
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(view-file (locate-get-filename))))
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;; Define a mode for locate
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;; Default directory is set to "/" so that dired commands, which
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;; expect to be in a tree, will work properly
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(defun locate-mode ()
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"Major mode for the `*Locate*' buffer made by \\[locate]."
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(kill-all-local-variables)
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(use-local-map locate-mode-map)
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(setq major-mode 'locate-mode
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mode-name "Locate"
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default-directory "/"
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dired-subdir-alist (list (cons "/" (point-min-marker))))
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(make-local-variable 'dired-move-to-filename-regexp)
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(setq dired-move-to-filename-regexp
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(make-string locate-filename-indentation ?\ ))
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(make-local-variable 'dired-actual-switches)
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(setq dired-actual-switches "")
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(make-local-variable 'dired-permission-flags-regexp)
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(setq dired-permission-flags-regexp "^\\( \\)")
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(make-local-variable 'revert-buffer-function)
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(setq revert-buffer-function 'locate-update)
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(run-hooks 'locate-mode-hook))
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(defun locate-do-setup ()
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(let ((search-string (car locate-history-list)))
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(goto-char (point-min))
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(save-excursion
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;; Nothing returned from locate command?
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(and (eobp)
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(progn
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(kill-buffer locate-buffer-name)
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(if locate-current-filter
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(error "Locate: no match for %s in database using filter %s"
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search-string locate-current-filter)
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(error "Locate: no match for %s in database" search-string))))
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(locate-insert-header search-string)
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(while (not (eobp))
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(insert-char ?\ locate-filename-indentation t)
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(locate-set-properties)
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(forward-line 1)))))
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(defun locate-set-properties ()
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(save-excursion
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(let ((pos (locate-get-file-positions)))
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(add-text-properties (elt pos 0) (elt pos 1)
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(list 'mouse-face locate-mouse-face)))))
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(defun locate-insert-header (search-string)
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(let ((locate-format-string "Matches for %s")
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(locate-regexp-match
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(concat " *Matches for \\(" (regexp-quote search-string) "\\)"))
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(locate-format-args (list search-string))
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)
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(and locate-fcodes-file
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(setq locate-format-string
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(concat locate-format-string " in %s")
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locate-regexp-match
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(concat locate-regexp-match
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" in \\("
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(regexp-quote locate-fcodes-file)
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"\\)")
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locate-format-args
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(append (list locate-fcodes-file) locate-format-args)))
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(and locate-current-filter
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(setq locate-format-string
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(concat locate-format-string " using filter %s")
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locate-regexp-match
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(concat locate-regexp-match
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" using filter "
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"\\("
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(regexp-quote locate-current-filter)
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"\\)")
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locate-format-args
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(append (list locate-current-filter) locate-format-args)))
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(setq locate-format-string
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(concat locate-format-string ": \n\n")
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locate-regexp-match
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(concat locate-regexp-match ": \n"))
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(insert (apply 'format locate-format-string (reverse locate-format-args)))
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(save-excursion
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(goto-char (point-min))
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(if (not (looking-at locate-regexp-match))
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nil
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(add-text-properties (match-beginning 1) (match-end 1)
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(list 'face locate-header-face))
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(and (match-beginning 2)
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(add-text-properties (match-beginning 2) (match-end 2)
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(list 'face locate-header-face)))
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(and (match-beginning 3)
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(add-text-properties (match-beginning 3) (match-end 3)
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(list 'face locate-header-face)))
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))))
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(defun locate-tags ()
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"Visit a tags table in `*Locate*' mode."
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(interactive)
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(let ((tags-table (locate-get-filename)))
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(and (y-or-n-p (format "Visit tags table %s? " tags-table))
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(visit-tags-table tags-table))))
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;; From Stephen Eglen <stephen@cns.ed.ac.uk>
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(defun locate-update (ignore1 ignore2)
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"Update the locate database.
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Database is updated using the shell command in `locate-update-command'."
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(let ((str (car locate-history-list)))
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(cond ((yes-or-no-p "Update locate database (may take a few seconds)? ")
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(shell-command locate-update-command)
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(locate str)))))
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(provide 'locate)
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;;; locate.el ends here
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