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comparison lisp/apel/file-detect.el @ 155:43dd3413c7c7 r20-3b4

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Import from CVS: tag r20-3b4
author cvs
date Mon, 13 Aug 2007 09:39:39 +0200
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154:94141801dd7e 155:43dd3413c7c7
1 ;;; file-detect.el --- Emacs Lisp file detection utility
2
3 ;; Copyright (C) 1996,1997 Free Software Foundation, Inc.
4
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; Version:
7 ;; $Id: file-detect.el,v 1.1 1997/06/03 04:18:35 steve Exp $
8 ;; Keywords: install, module
9
10 ;; This file is part of APEL (A Portable Emacs Library).
11
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.
16
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.
21
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.
26
27 ;;; Code:
28
29 (defvar default-load-path load-path)
30
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'.
34
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/\"
40
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)
46 load-path
47 default-load-path))
48 p)
49 (if (and (catch 'tag
50 (while rest
51 (setq p (expand-file-name path (car rest)))
52 (if (file-directory-p p)
53 (throw 'tag p)
54 )
55 (setq rest (cdr rest))
56 ))
57 (not (member p load-path))
58 )
59 (setq load-path
60 (if (memq 'append options)
61 (append load-path (list p))
62 (cons p load-path)
63 ))
64 )))
65
66 (defun add-latest-path (pattern &optional all-paths)
67 "Add latest path matched by PATTERN to `load-path'
68 if it exists under `default-load-path' directories
69 and it does not exist in `load-path'.
70
71 If optional argument ALL-PATHS is specified, it is searched from all
72 of load-path instead of default-load-path. [file-detect.el]"
73 (let ((path (get-latest-path pattern all-paths)))
74 (if path
75 (add-to-list 'load-path path)
76 )))
77
78 (defun get-latest-path (pattern &optional all-paths)
79 "Return latest directory in default-load-path
80 which is matched to regexp PATTERN.
81 If optional argument ALL-PATHS is specified,
82 it is searched from all of load-path instead of default-load-path."
83 (catch 'tag
84 (let ((paths (if all-paths
85 load-path
86 default-load-path))
87 dir)
88 (while (setq dir (car paths))
89 (if (and (file-exists-p dir)
90 (file-directory-p dir)
91 )
92 (let ((files (sort (directory-files dir t pattern t)
93 (function file-newer-than-file-p)))
94 file)
95 (while (setq file (car files))
96 (if (file-directory-p file)
97 (throw 'tag file)
98 )
99 (setq files (cdr files))
100 )))
101 (setq paths (cdr paths))
102 ))))
103
104 (defun file-installed-p (file &optional paths)
105 "Return absolute-path of FILE if FILE exists in PATHS.
106 If PATHS is omitted, `load-path' is used."
107 (if (null paths)
108 (setq paths load-path)
109 )
110 (catch 'tag
111 (let (path)
112 (while paths
113 (setq path (expand-file-name file (car paths)))
114 (if (file-exists-p path)
115 (throw 'tag path)
116 )
117 (setq paths (cdr paths))
118 ))))
119
120 (defvar exec-suffix-list '("")
121 "*List of suffixes for executable.")
122
123 (defun exec-installed-p (file &optional paths suffixes)
124 "Return absolute-path of FILE if FILE exists in PATHS.
125 If PATHS is omitted, `exec-path' is used.
126 If suffixes is omitted, `exec-suffix-list' is used."
127 (or paths
128 (setq paths exec-path)
129 )
130 (or suffixes
131 (setq suffixes exec-suffix-list)
132 )
133 (catch 'tag
134 (while paths
135 (let ((stem (expand-file-name file (car paths)))
136 (sufs suffixes)
137 )
138 (while sufs
139 (let ((file (concat stem (car sufs))))
140 (if (file-exists-p file)
141 (throw 'tag file)
142 ))
143 (setq sufs (cdr sufs))
144 ))
145 (setq paths (cdr paths))
146 )))
147
148 (defun module-installed-p (module &optional paths)
149 "Return t if module is provided or exists in PATHS.
150 If PATHS is omitted, `load-path' is used."
151 (or (featurep module)
152 (exec-installed-p (symbol-name module) load-path '(".elc" ".el"))
153 ))
154
155
156 ;;; @ end
157 ;;;
158
159 (provide 'file-detect)
160
161 ;;; file-detect.el ends here