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;;; helm-locate.el --- helm interface for locate.
;; Copyright (C) 2012 Thierry Volpiatto <thierry.volpiatto@gmail.com>
;; This program 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 3 of the License, or
;; (at your option) any later version.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;; NOTE for WINDOZE users:
;; You have to install Everything with his command line interface here:
;; http://www.voidtools.com/download.php
;;; Code:
(eval-when-compile (require 'cl))
(require 'helm)
(require 'helm-files)
(defgroup helm-locate nil
"Locate related Applications and libraries for Helm."
:group 'helm)
(defcustom helm-locate-db-file-regexp "m?locate\.db$"
"Default regexp to match locate database.
If nil Search in all files."
:type 'string
:group 'helm-locate)
(defcustom helm-ff-locate-db-filename "locate.db"
"The basename of the locatedb file you use locally in your directories.
When this is set and `helm' find such a file in the directory from
where you launch locate, it will use this file and will not prompt you
for a db file.
Note that this happen only when locate is launched with a prefix arg."
:group 'helm-locate
:type 'string)
(defcustom helm-c-locate-command nil
"A list of arguments for locate program.
If nil it will be calculated when `helm-locate' startup
with these default values for different systems:
Gnu/linux: \"locate -i -r %s\"
berkeley-unix: \"locate -i %s\"
windows-nt: \"es -i -r %s\"
Others: \"locate %s\"
This string will be passed to format so it should end with `%s'.
The \"-r\" option must be the last option."
:type 'string
:group 'helm-locate)
(defun helm-ff-find-locatedb (&optional from-ff)
"Try to find if a local locatedb file is available.
The search is done in `helm-ff-default-directory' or
fall back to `default-directory' if FROM-FF is nil."
(when helm-ff-locate-db-filename
(cond ((and helm-ff-default-directory
from-ff
(file-exists-p (expand-file-name
helm-ff-locate-db-filename
helm-ff-default-directory))
(expand-file-name
helm-ff-locate-db-filename
helm-ff-default-directory)))
((and (not from-ff)
(file-exists-p (expand-file-name
helm-ff-locate-db-filename
default-directory))
(expand-file-name
helm-ff-locate-db-filename
default-directory))))))
(defun helm-locate-1 (&optional localdb init from-ff)
"Generic function to run Locate.
if LOCALDB is non--nil search and use a local locate db file.
INIT is a string to use as initial input in prompt.
See `helm-locate-with-db' and `helm-locate'."
(helm-locate-with-db
(and localdb
(or (helm-ff-find-locatedb from-ff)
(helm-c-read-file-name
"LocateDBFiles: "
:initial-input (or helm-ff-default-directory
default-directory)
:marked-candidates t
:preselect helm-locate-db-file-regexp
:test #'(lambda (x)
(if helm-locate-db-file-regexp
;; Select only locate db files and directories
;; to allow navigation.
(or (string-match
helm-locate-db-file-regexp x)
(file-directory-p x))
x)))))
init))
(defun helm-locate-with-db (&optional db initial-input)
"Run locate -d DB.
If DB is not given or nil use locate without -d option.
Argument DB can be given as a string or list of db files.
Argument INITIAL-INPUT is a string to use as initial-input.
See also `helm-locate'."
(when (and db (stringp db)) (setq db (list db)))
(unless helm-c-locate-command
(setq helm-c-locate-command
(case system-type
('gnu/linux "locate -i -r %s")
('berkeley-unix "locate -i %s")
('windows-nt "es -i -r %s")
(t "locate %s"))))
(let ((helm-c-locate-command
(if db
(replace-regexp-in-string
"locate"
(format "locate -d %s"
(mapconcat 'identity
;; Remove eventually
;; marked directories by error.
(loop for i in db
unless (file-directory-p i)
collect i) ":"))
helm-c-locate-command)
helm-c-locate-command)))
(helm :sources 'helm-c-source-locate
:buffer "*helm locate*"
:input initial-input
:keymap helm-generic-files-map)))
(defun helm-c-locate-init ()
"Initialize async locate process for `helm-c-source-locate'."
(setq mode-line-format
'(" " mode-line-buffer-identification " "
(line-number-mode "%l") " "
(:eval (propertize "(Locate Process Running) "
'face '((:foreground "red"))))))
(prog1
(start-process-shell-command "locate-process" nil
(format helm-c-locate-command
helm-pattern))
(set-process-sentinel (get-process "locate-process")
#'(lambda (process event)
(when (string= event "finished\n")
(with-helm-window
(force-mode-line-update nil)
(helm-update-move-first-line)))))))
(defvar helm-c-source-locate
`((name . "Locate")
(candidates . helm-c-locate-init)
(type . file)
(requires-pattern . 3)
(keymap . ,helm-generic-files-map)
(help-message . helm-generic-file-help-message)
(candidate-number-limit . 9999)
(mode-line . helm-generic-file-mode-line-string)
(delayed))
"Find files matching the current input pattern with locate.")
(defun helm-c-locate-read-file-name (prompt &optional init)
"Search a file with locate and return it's filename.
Use argument PROMPT and INIT for `helm' arguments
prompt and input."
(helm :sources
'((name . "Locate")
(candidates . helm-c-locate-init)
(action . identity)
(requires-pattern . 3)
(candidate-number-limit . 9999)
(mode-line . helm-generic-file-mode-line-string)
(delayed))
:prompt prompt
:input init
:buffer "*helm locate rfn*"))
;;;###autoload
(defun helm-locate (arg)
"Preconfigured `helm' for Locate.
Note: you can add locate options after entering pattern.
See 'man locate' for valid options.
You can specify a specific database with prefix argument ARG \(C-u\).
Many databases can be used: navigate and mark them.
See also `helm-locate-with-db'.
To create a user specific db, use
\"updatedb -l 0 -o db_path -U directory\".
Where db_path is a filename matched by
`helm-locate-db-file-regexp'."
(interactive "P")
(setq helm-ff-default-directory default-directory)
(helm-locate-1 arg))
(provide 'helm-locate)
;;; helm-locate.el ends here
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