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1 ;;; file-detect.el --- Emacs Lisp file detection utility
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2
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3 ;; Copyright (C) 1996,1997 Free Software Foundation, Inc.
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4
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Version:
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7 ;; $Id: file-detect.el,v 1.1 1997/06/03 04:18:35 steve Exp $
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8 ;; Keywords: install, module
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9
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10 ;; This file is part of APEL (A Portable Emacs Library).
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11
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12 ;; This program is free software; you can redistribute it and/or
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13 ;; modify it under the terms of the GNU General Public License as
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14 ;; published by the Free Software Foundation; either version 2, or (at
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15 ;; your option) any later version.
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16
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17 ;; This program is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Code:
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28
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29 (defvar default-load-path load-path)
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30
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31 (defun add-path (path &rest options)
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32 "Add PATH to `load-path' if it exists under `default-load-path'
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33 directories and it does not exist in `load-path'.
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34
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35 You can use following PATH styles:
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36 load-path relative: \"PATH/\"
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37 (it is searched from `defaul-load-path')
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38 home directory relative: \"~/PATH/\" \"~USER/PATH/\"
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39 absolute path: \"/HOO/BAR/BAZ/\"
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40
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41 You can specify following OPTIONS:
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42 'all-paths search from `load-path'
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43 instead of `default-load-path'
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44 'append add PATH to the last of `load-path'"
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45 (let ((rest (if (memq 'all-paths options)
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46 load-path
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47 default-load-path))
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48 p)
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49 (if (and (catch 'tag
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50 (while rest
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51 (setq p (expand-file-name path (car rest)))
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52 (if (file-directory-p p)
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53 (throw 'tag p)
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54 )
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55 (setq rest (cdr rest))
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56 ))
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57 (not (member p load-path))
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58 )
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59 (setq load-path
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60 (if (memq 'append options)
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61 (append load-path (list p))
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62 (cons p load-path)
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63 ))
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64 )))
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65
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66 (defun add-latest-path (pattern &optional all-paths)
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67 "Add latest path matched by PATTERN to `load-path'
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68 if it exists under `default-load-path' directories
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69 and it does not exist in `load-path'.
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70
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71 If optional argument ALL-PATHS is specified, it is searched from all
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72 of load-path instead of default-load-path. [file-detect.el]"
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73 (let ((path (get-latest-path pattern all-paths)))
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74 (if path
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75 (add-to-list 'load-path path)
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76 )))
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77
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78 (defun get-latest-path (pattern &optional all-paths)
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79 "Return latest directory in default-load-path
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80 which is matched to regexp PATTERN.
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81 If optional argument ALL-PATHS is specified,
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82 it is searched from all of load-path instead of default-load-path."
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83 (catch 'tag
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84 (let ((paths (if all-paths
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85 load-path
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86 default-load-path))
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87 dir)
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88 (while (setq dir (car paths))
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89 (if (and (file-exists-p dir)
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90 (file-directory-p dir)
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91 )
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92 (let ((files (sort (directory-files dir t pattern t)
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93 (function file-newer-than-file-p)))
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94 file)
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95 (while (setq file (car files))
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96 (if (file-directory-p file)
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97 (throw 'tag file)
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98 )
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99 (setq files (cdr files))
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100 )))
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101 (setq paths (cdr paths))
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102 ))))
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103
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104 (defun file-installed-p (file &optional paths)
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105 "Return absolute-path of FILE if FILE exists in PATHS.
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106 If PATHS is omitted, `load-path' is used."
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107 (if (null paths)
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108 (setq paths load-path)
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109 )
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110 (catch 'tag
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111 (let (path)
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112 (while paths
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113 (setq path (expand-file-name file (car paths)))
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114 (if (file-exists-p path)
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115 (throw 'tag path)
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116 )
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117 (setq paths (cdr paths))
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118 ))))
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119
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120 (defvar exec-suffix-list '("")
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121 "*List of suffixes for executable.")
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122
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123 (defun exec-installed-p (file &optional paths suffixes)
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124 "Return absolute-path of FILE if FILE exists in PATHS.
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125 If PATHS is omitted, `exec-path' is used.
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126 If suffixes is omitted, `exec-suffix-list' is used."
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127 (or paths
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128 (setq paths exec-path)
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129 )
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130 (or suffixes
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131 (setq suffixes exec-suffix-list)
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132 )
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133 (catch 'tag
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134 (while paths
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135 (let ((stem (expand-file-name file (car paths)))
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136 (sufs suffixes)
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137 )
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138 (while sufs
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139 (let ((file (concat stem (car sufs))))
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140 (if (file-exists-p file)
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141 (throw 'tag file)
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142 ))
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143 (setq sufs (cdr sufs))
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144 ))
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145 (setq paths (cdr paths))
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146 )))
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147
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148 (defun module-installed-p (module &optional paths)
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149 "Return t if module is provided or exists in PATHS.
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150 If PATHS is omitted, `load-path' is used."
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151 (or (featurep module)
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152 (exec-installed-p (symbol-name module) load-path '(".elc" ".el"))
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153 ))
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154
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155
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156 ;;; @ end
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157 ;;;
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158
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159 (provide 'file-detect)
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160
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161 ;;; file-detect.el ends here
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