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>
6 ;; Version: $Id: file-detect.el,v 4.1 1997/11/04 09:02:49 morioka Exp $
7 ;; Keywords: file detection, install, module
9 ;; This file is part of APEL (A Portable Emacs Library).
11 ;; This program is free software; you can redistribute it and/or
12 ;; modify it under the terms of the GNU General Public License as
13 ;; published by the Free Software Foundation; either version 2, or (at
14 ;; your option) any later version.
16 ;; This program is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
28 (defvar default-load-path load-path)
31 (defun add-path (path &rest options)
32 "Add PATH to `load-path' if it exists under `default-load-path'
33 directories and it does not exist in `load-path'.
35 You can use following PATH styles:
36 load-path relative: \"PATH/\"
37 (it is searched from `defaul-load-path')
38 home directory relative: \"~/PATH/\" \"~USER/PATH/\"
39 absolute path: \"/HOO/BAR/BAZ/\"
41 You can specify following OPTIONS:
42 'all-paths search from `load-path'
43 instead of `default-load-path'
44 'append add PATH to the last of `load-path'"
45 (let ((rest (if (memq 'all-paths options)
51 (setq p (expand-file-name path (car rest)))
52 (if (file-directory-p p)
55 (setq rest (cdr rest))
57 (not (member p load-path))
60 (if (memq 'append options)
61 (append load-path (list p))
67 (defun add-latest-path (pattern &optional all-paths)
68 "Add latest path matched by PATTERN to `load-path'
69 if it exists under `default-load-path' directories
70 and it does not exist in `load-path'.
72 If optional argument ALL-PATHS is specified, it is searched from all
73 of load-path instead of default-load-path. [file-detect.el]"
74 (let ((path (get-latest-path pattern all-paths)))
76 (add-to-list 'load-path path)
80 (defun get-latest-path (pattern &optional all-paths)
81 "Return latest directory in default-load-path
82 which is matched to regexp PATTERN.
83 If optional argument ALL-PATHS is specified,
84 it is searched from all of load-path instead of default-load-path."
86 (let ((paths (if all-paths
90 (while (setq dir (car paths))
91 (if (and (file-exists-p dir)
92 (file-directory-p dir)
94 (let ((files (sort (directory-files dir t pattern t)
95 (function file-newer-than-file-p)))
97 (while (setq file (car files))
98 (if (file-directory-p file)
101 (setq files (cdr files))
103 (setq paths (cdr paths))
107 (defun file-installed-p (file &optional paths)
108 "Return absolute-path of FILE if FILE exists in PATHS.
109 If PATHS is omitted, `load-path' is used."
111 (setq paths load-path)
116 (setq path (expand-file-name file (car paths)))
117 (if (file-exists-p path)
120 (setq paths (cdr paths))
124 (defvar exec-suffix-list '("")
125 "*List of suffixes for executable.")
128 (defun exec-installed-p (file &optional paths suffixes)
129 "Return absolute-path of FILE if FILE exists in PATHS.
130 If PATHS is omitted, `exec-path' is used.
131 If suffixes is omitted, `exec-suffix-list' is used."
133 (setq paths exec-path)
136 (setq suffixes exec-suffix-list)
140 (let ((stem (expand-file-name file (car paths)))
144 (let ((file (concat stem (car sufs))))
145 (if (file-exists-p file)
148 (setq sufs (cdr sufs))
150 (setq paths (cdr paths))
154 (defun module-installed-p (module &optional paths)
155 "Return t if module is provided or exists in PATHS.
156 If PATHS is omitted, `load-path' is used."
157 (or (featurep module)
158 (exec-installed-p (symbol-name module) load-path '(".elc" ".el"))
165 (provide 'file-detect)
167 ;;; file-detect.el ends here