1 | ;;; path-util.el --- Emacs Lisp file detection utility |
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2 | |
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3 | ;; Copyright (C) 1996,1997,1999 Free Software Foundation, Inc. |
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4 | |
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5 | ;; Author: MORIOKA Tomohiko <tomo@m17n.org> |
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6 | ;; Keywords: file detection, install, module |
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7 | |
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8 | ;; This file is part of APEL (A Portable Emacs Library). |
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9 | |
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10 | ;; This program is free software; you can redistribute it and/or |
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11 | ;; modify it under the terms of the GNU General Public License as |
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12 | ;; published by the Free Software Foundation; either version 2, or (at |
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13 | ;; your option) any later version. |
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14 | |
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15 | ;; This program is distributed in the hope that it will be useful, but |
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16 | ;; WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | ;; General Public License for more details. |
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19 | |
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20 | ;; You should have received a copy of the GNU General Public License |
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21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
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22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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23 | ;; Boston, MA 02111-1307, USA. |
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24 | |
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25 | ;;; Code: |
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26 | |
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27 | (require 'poe) |
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28 | |
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29 | (defvar default-load-path load-path |
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30 | "*Base of `load-path'. |
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31 | It is used as default value of target path to search file or |
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32 | subdirectory under load-path.") |
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33 | |
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34 | ;;;###autoload |
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35 | (defun add-path (path &rest options) |
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36 | "Add PATH to `load-path' if it exists under `default-load-path' |
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37 | directories and it does not exist in `load-path'. |
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38 | |
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39 | You can use following PATH styles: |
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40 | load-path relative: \"PATH/\" |
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41 | (it is searched from `defaul-load-path') |
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42 | home directory relative: \"~/PATH/\" \"~USER/PATH/\" |
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43 | absolute path: \"/HOO/BAR/BAZ/\" |
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44 | |
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45 | You can specify following OPTIONS: |
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46 | 'all-paths search from `load-path' |
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47 | instead of `default-load-path' |
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48 | 'append add PATH to the last of `load-path'" |
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49 | (let ((rest (if (memq 'all-paths options) |
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50 | load-path |
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51 | default-load-path)) |
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52 | p) |
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53 | (if (and (catch 'tag |
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54 | (while rest |
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55 | (setq p (expand-file-name path (car rest))) |
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56 | (if (file-directory-p p) |
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57 | (throw 'tag p)) |
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58 | (setq rest (cdr rest)))) |
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59 | (not (or (member p load-path) |
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60 | (if (string-match "/$" p) |
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61 | (member (substring p 0 (1- (length p))) load-path) |
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62 | (member (file-name-as-directory p) load-path))))) |
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63 | (setq load-path |
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64 | (if (memq 'append options) |
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65 | (append load-path (list p)) |
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66 | (cons p load-path)))))) |
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67 | |
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68 | ;;;###autoload |
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69 | (defun add-latest-path (pattern &optional all-paths) |
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70 | "Add latest path matched by PATTERN to `load-path' |
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71 | if it exists under `default-load-path' directories |
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72 | and it does not exist in `load-path'. |
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73 | |
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74 | If optional argument ALL-PATHS is specified, it is searched from all |
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75 | of load-path instead of default-load-path." |
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76 | (let ((path (get-latest-path pattern all-paths))) |
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77 | (if path |
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78 | (add-to-list 'load-path path) |
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79 | ))) |
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80 | |
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81 | ;;;###autoload |
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82 | (defun get-latest-path (pattern &optional all-paths) |
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83 | "Return latest directory in default-load-path |
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84 | which is matched to regexp PATTERN. |
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85 | If optional argument ALL-PATHS is specified, |
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86 | it is searched from all of load-path instead of default-load-path." |
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87 | (catch 'tag |
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88 | (let ((paths (if all-paths |
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89 | load-path |
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90 | default-load-path)) |
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91 | dir) |
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92 | (while (setq dir (car paths)) |
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93 | (if (and (file-exists-p dir) |
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94 | (file-directory-p dir) |
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95 | ) |
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96 | (let ((files (sort (directory-files dir t pattern t) |
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97 | (function file-newer-than-file-p))) |
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98 | file) |
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99 | (while (setq file (car files)) |
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100 | (if (file-directory-p file) |
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101 | (throw 'tag file) |
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102 | ) |
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103 | (setq files (cdr files)) |
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104 | ))) |
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105 | (setq paths (cdr paths)) |
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106 | )))) |
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107 | |
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108 | ;;;###autoload |
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109 | (defun file-installed-p (file &optional paths) |
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110 | "Return absolute-path of FILE if FILE exists in PATHS. |
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111 | If PATHS is omitted, `load-path' is used." |
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112 | (if (null paths) |
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113 | (setq paths load-path) |
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114 | ) |
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115 | (catch 'tag |
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116 | (let (path) |
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117 | (while paths |
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118 | (setq path (expand-file-name file (car paths))) |
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119 | (if (file-exists-p path) |
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120 | (throw 'tag path) |
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121 | ) |
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122 | (setq paths (cdr paths)) |
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123 | )))) |
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124 | |
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125 | ;;;###autoload |
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126 | (defvar exec-suffix-list '("") |
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127 | "*List of suffixes for executable.") |
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128 | |
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129 | ;;;###autoload |
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130 | (defun exec-installed-p (file &optional paths suffixes) |
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131 | "Return absolute-path of FILE if FILE exists in PATHS. |
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132 | If PATHS is omitted, `exec-path' is used. |
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133 | If suffixes is omitted, `exec-suffix-list' is used." |
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134 | (or paths |
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135 | (setq paths exec-path) |
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136 | ) |
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137 | (or suffixes |
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138 | (setq suffixes exec-suffix-list) |
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139 | ) |
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140 | (let (files) |
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141 | (catch 'tag |
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142 | (while suffixes |
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143 | (let ((suf (car suffixes))) |
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144 | (if (and (not (string= suf "")) |
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145 | (string-match (concat (regexp-quote suf) "$") file)) |
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146 | (progn |
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147 | (setq files (list file)) |
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148 | (throw 'tag nil) |
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149 | ) |
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150 | (setq files (cons (concat file suf) files)) |
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151 | ) |
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152 | (setq suffixes (cdr suffixes)) |
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153 | ))) |
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154 | (setq files (nreverse files)) |
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155 | (catch 'tag |
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156 | (while paths |
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157 | (let ((path (car paths)) |
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158 | (files files) |
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159 | ) |
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160 | (while files |
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161 | (setq file (expand-file-name (car files) path)) |
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162 | (if (file-executable-p file) |
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163 | (throw 'tag file) |
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164 | ) |
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165 | (setq files (cdr files)) |
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166 | ) |
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167 | (setq paths (cdr paths)) |
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168 | ))))) |
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169 | |
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170 | ;;;###autoload |
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171 | (defun module-installed-p (module &optional paths) |
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172 | "Return t if module is provided or exists in PATHS. |
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173 | If PATHS is omitted, `load-path' is used." |
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174 | (or (featurep module) |
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175 | (let ((file (symbol-name module))) |
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176 | (or paths |
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177 | (setq paths load-path) |
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178 | ) |
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179 | (catch 'tag |
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180 | (while paths |
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181 | (let ((stem (expand-file-name file (car paths))) |
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182 | (sufs '(".elc" ".el")) |
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183 | ) |
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184 | (while sufs |
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185 | (let ((file (concat stem (car sufs)))) |
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186 | (if (file-exists-p file) |
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187 | (throw 'tag file) |
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188 | )) |
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189 | (setq sufs (cdr sufs)) |
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190 | )) |
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191 | (setq paths (cdr paths)) |
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192 | ))))) |
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193 | |
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194 | |
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195 | ;;; @ end |
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196 | ;;; |
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197 | |
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198 | (require 'product) |
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199 | (product-provide (provide 'path-util) (require 'apel-ver)) |
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200 | |
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201 | ;;; path-util.el ends here |
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