1 ;;; file-detect.el --- Emacs Lisp file detection utility
3 ;; Copyright (C) 1996,1997 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
7 ;; $Id: file-detect.el,v 3.4 1997/06/28 07:18:31 morioka Exp $
8 ;; Keywords: install, module
10 ;; This file is part of APEL (A Portable Emacs Library).
12 ;; This program is free software; you can redistribute it and/or
13 ;; modify it under the terms of the GNU General Public License as
14 ;; published by the Free Software Foundation; either version 2, or (at
15 ;; your option) any later version.
17 ;; This program is distributed in the hope that it will be useful, but
18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 ;; General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
25 ;; Boston, MA 02111-1307, USA.
29 (defvar default-load-path load-path)
32 (defun add-path (path &rest options)
33 "Add PATH to `load-path' if it exists under `default-load-path'
34 directories and it does not exist in `load-path'.
36 You can use following PATH styles:
37 load-path relative: \"PATH/\"
38 (it is searched from `defaul-load-path')
39 home directory relative: \"~/PATH/\" \"~USER/PATH/\"
40 absolute path: \"/HOO/BAR/BAZ/\"
42 You can specify following OPTIONS:
43 'all-paths search from `load-path'
44 instead of `default-load-path'
45 'append add PATH to the last of `load-path'"
46 (let ((rest (if (memq 'all-paths options)
52 (setq p (expand-file-name path (car rest)))
53 (if (file-directory-p p)
56 (setq rest (cdr rest))
58 (not (member p load-path))
61 (if (memq 'append options)
62 (append load-path (list p))
68 (defun add-latest-path (pattern &optional all-paths)
69 "Add latest path matched by PATTERN to `load-path'
70 if it exists under `default-load-path' directories
71 and it does not exist in `load-path'.
73 If optional argument ALL-PATHS is specified, it is searched from all
74 of load-path instead of default-load-path. [file-detect.el]"
75 (let ((path (get-latest-path pattern all-paths)))
77 (add-to-list 'load-path path)
81 (defun get-latest-path (pattern &optional all-paths)
82 "Return latest directory in default-load-path
83 which is matched to regexp PATTERN.
84 If optional argument ALL-PATHS is specified,
85 it is searched from all of load-path instead of default-load-path."
87 (let ((paths (if all-paths
91 (while (setq dir (car paths))
92 (if (and (file-exists-p dir)
93 (file-directory-p dir)
95 (let ((files (sort (directory-files dir t pattern t)
96 (function file-newer-than-file-p)))
98 (while (setq file (car files))
99 (if (file-directory-p file)
102 (setq files (cdr files))
104 (setq paths (cdr paths))
108 (defun file-installed-p (file &optional paths)
109 "Return absolute-path of FILE if FILE exists in PATHS.
110 If PATHS is omitted, `load-path' is used."
112 (setq paths load-path)
117 (setq path (expand-file-name file (car paths)))
118 (if (file-exists-p path)
121 (setq paths (cdr paths))
125 (defvar exec-suffix-list '("")
126 "*List of suffixes for executable.")
129 (defun exec-installed-p (file &optional paths suffixes)
130 "Return absolute-path of FILE if FILE exists in PATHS.
131 If PATHS is omitted, `exec-path' is used.
132 If suffixes is omitted, `exec-suffix-list' is used."
134 (setq paths exec-path)
137 (setq suffixes exec-suffix-list)
141 (let ((stem (expand-file-name file (car paths)))
145 (let ((file (concat stem (car sufs))))
146 (if (file-exists-p file)
149 (setq sufs (cdr sufs))
151 (setq paths (cdr paths))
155 (defun module-installed-p (module &optional paths)
156 "Return t if module is provided or exists in PATHS.
157 If PATHS is omitted, `load-path' is used."
158 (or (featurep module)
159 (exec-installed-p (symbol-name module) load-path '(".elc" ".el"))
166 (provide 'file-detect)
168 ;;; file-detect.el ends here