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428
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1 ;;; find-paths.el --- setup various XEmacs paths
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2
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3 ;; Copyright (C) 1985-1986, 1990, 1992-1997 Free Software Foundation, Inc.
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4 ;; Copyright (c) 1993, 1994 Sun Microsystems, Inc.
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5 ;; Copyright (C) 1995 Board of Trustees, University of Illinois
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6
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7 ;; Author: Mike Sperber <sperber@informatik.uni-tuebingen.de>
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8 ;; Maintainer: XEmacs Development Team
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9 ;; Keywords: internal, dumped
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10
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11 ;; This file is part of XEmacs.
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12
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13 ;; XEmacs is free software; you can redistribute it and/or modify it
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14 ;; under the terms of the GNU General Public License as published by
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15 ;; the Free Software Foundation; either version 2, or (at your option)
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16 ;; any later version.
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17
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18 ;; XEmacs is distributed in the hope that it will be useful, but
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19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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21 ;; General Public License for more details.
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22
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23 ;; You should have received a copy of the GNU General Public License
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24 ;; along with XEmacs; see the file COPYING. If not, write to the
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25 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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26 ;; Boston, MA 02111-1307, USA.
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27
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28 ;;; Synched up with: Not in FSF.
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29
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30 ;;; Commentary:
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31
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32 ;; This file is dumped with XEmacs.
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33
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34 ;; This file contains the library functionality to find paths into the
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35 ;; XEmacs hierarchy.
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36
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37 ;;; Code:
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38
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39 (defvar paths-version-control-filename-regexp
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40 "^\\(RCS\\|CVS\\|SCCS\\)$"
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41 "File bases associated with version control.")
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42
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43 (defvar paths-lisp-filename-regexp
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44 "^\\(.*\\.elc?\\)$"
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45 "File bases that contain Lisp file.")
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46
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47 (defvar paths-no-lisp-directory-regexp
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48 (concat "\\(" paths-version-control-filename-regexp "\\)"
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49 "\\|"
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50 "\\(" paths-lisp-filename-regexp "\\)")
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51 "File bases that may not be directories containing Lisp code.")
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52
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53 (defun paths-find-recursive-path (directories &optional max-depth exclude-regexp)
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54 "Return a list of the directory hierarchy underneath DIRECTORIES.
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55 The returned list is sorted by pre-order and lexicographically.
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56 MAX-DEPTH limits the depth of the search to MAX-DEPTH level,
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57 if it is a number. If MAX-DEPTH is NIL, the search depth is unlimited.
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58 EXCLUDE-REGEXP is a regexp that matches directory names to exclude
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59 from the search."
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60 (let ((path '()))
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61 (while directories
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62 (let ((directory (file-name-as-directory
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63 (expand-file-name
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64 (car directories)))))
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65 (if (paths-file-readable-directory-p directory)
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66 (let ((raw-entries
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67 (if (equal 0 max-depth)
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68 '()
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69 (directory-files directory nil "^[^.-]")))
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70 (reverse-dirs '()))
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71 (while raw-entries
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72 (if (null (string-match exclude-regexp (car raw-entries)))
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73 (setq reverse-dirs
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74 (cons (expand-file-name (car raw-entries) directory)
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75 reverse-dirs)))
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76 (setq raw-entries (cdr raw-entries)))
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77
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78 (let ((sub-path
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79 (paths-find-recursive-path (reverse reverse-dirs)
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80 (if (numberp max-depth)
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81 (- max-depth 1)
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82 max-depth)
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83 exclude-regexp)))
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84 (setq path (nconc path
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85 (list directory)
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86 sub-path))))))
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87 (setq directories (cdr directories)))
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88 path))
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89
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90 (defun paths-file-readable-directory-p (filename)
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91 "Check if filename is a readable directory."
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92 (and (file-directory-p filename)
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93 (file-readable-p filename)))
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94
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95 (defun paths-find-recursive-load-path (directories &optional max-depth)
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96 "Construct a recursive load path underneath DIRECTORIES."
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97 (paths-find-recursive-path directories
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98 max-depth paths-no-lisp-directory-regexp))
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99
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100 (defun paths-emacs-root-p (directory)
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101 "Check if DIRECTORY is a plausible installation root for XEmacs."
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102 (or
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103 ;; installed
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104 (paths-file-readable-directory-p (paths-construct-path (list directory
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105 "lib"
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106 emacs-program-name)))
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107 ;; in-place or windows-nt
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108 (and
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109 (paths-file-readable-directory-p (paths-construct-path (list directory "lisp")))
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110 (paths-file-readable-directory-p (paths-construct-path (list directory "etc"))))))
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111
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112 (defun paths-chase-symlink (file-name)
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113 "Chase a symlink until the bitter end."
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114 (let ((maybe-symlink (file-symlink-p file-name)))
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115 (if maybe-symlink
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116 (let* ((directory (file-name-directory file-name))
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117 (destination (expand-file-name maybe-symlink directory)))
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118 (paths-chase-symlink destination))
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119 file-name)))
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120
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121 (defun paths-find-emacs-root
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122 (invocation-directory invocation-name)
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123 "Find the run-time root of XEmacs."
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124 (let* ((executable-file-name (paths-chase-symlink
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125 (concat invocation-directory
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126 invocation-name)))
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127 (executable-directory (file-name-directory executable-file-name))
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128 (maybe-root-1 (file-name-as-directory
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129 (paths-construct-path '("..") executable-directory)))
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130 (maybe-root-2 (file-name-as-directory
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131 (paths-construct-path '(".." "..") executable-directory))))
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132 (or (and (paths-emacs-root-p maybe-root-1)
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133 maybe-root-1)
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134 (and (paths-emacs-root-p maybe-root-2)
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135 maybe-root-2))))
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136
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137 (defun paths-construct-path (components &optional expand-directory)
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138 "Convert list of path components COMPONENTS into a path.
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139 If EXPAND-DIRECTORY is non-NIL, use it as a directory to feed
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140 to EXPAND-FILE-NAME."
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141 (let* ((reverse-components (reverse components))
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142 (last-component (car reverse-components))
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143 (first-components (reverse (cdr reverse-components)))
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144 (path
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145 (apply #'concat
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146 (append (mapcar #'file-name-as-directory first-components)
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147 (list last-component)))))
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148 (if expand-directory
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149 (expand-file-name path expand-directory)
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150 path)))
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151
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152 (defun paths-construct-emacs-directory (root suffix base)
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153 "Construct a directory name within the XEmacs hierarchy."
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154 (file-name-as-directory
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155 (expand-file-name
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156 (concat
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157 (file-name-as-directory root)
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158 suffix
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159 base))))
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160
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161 (defun paths-find-emacs-directory (roots suffix base
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162 &optional envvar default keep-suffix)
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163 "Find a directory in the XEmacs hierarchy.
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164 ROOTS must be a list of installation roots.
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165 SUFFIX is the subdirectory from there.
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166 BASE is the base to look for.
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167 ENVVAR is the name of the environment variable that might also
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168 specify the directory.
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169 DEFAULT is the preferred value.
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170 If KEEP-SUFFIX is non-nil, the suffix must be respected in searching
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171 the directory."
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172 (let ((preferred-value (or (and envvar (getenv envvar))
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173 default)))
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174 (if (and preferred-value
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175 (paths-file-readable-directory-p preferred-value))
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176 (file-name-as-directory preferred-value)
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177 (catch 'gotcha
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178 (while roots
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179 (let* ((root (car roots))
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180 ;; installed
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181 (path (paths-construct-emacs-directory root suffix base)))
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182 (if (paths-file-readable-directory-p path)
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183 (throw 'gotcha path)
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184 ;; in-place
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185 (if (null keep-suffix)
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186 (let ((path (paths-construct-emacs-directory root "" base)))
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187 (if (paths-file-readable-directory-p path)
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188 (throw 'gotcha path))))))
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189 (setq roots (cdr roots)))
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190 nil))))
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191
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192 (defun paths-find-site-directory (roots base &optional envvar default)
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193 "Find a site-specific directory in the XEmacs hierarchy."
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194 (paths-find-emacs-directory roots
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195 (file-name-as-directory
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196 (paths-construct-path (list
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197 "lib"
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198 emacs-program-name)))
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199 base
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200 envvar default))
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201
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202 (defun paths-find-version-directory (roots base
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203 &optional envvar default enforce-version)
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204 "Find a version-specific directory in the XEmacs hierarchy.
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205 If ENFORCE-VERSION is non-nil, the directory must contain the XEmacs version."
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206 (paths-find-emacs-directory roots
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207 (file-name-as-directory
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208 (paths-construct-path
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209 (list "lib"
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210 (construct-emacs-version-name))))
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211 base
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212 envvar default
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213 enforce-version))
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214
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215 (defun paths-find-architecture-directory (roots base &optional envvar default)
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216 "Find an architecture-specific directory in the XEmacs hierarchy."
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217 (or
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218 ;; from more to less specific
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219 (paths-find-version-directory roots
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220 (concat base system-configuration)
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221 envvar default)
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222 (paths-find-version-directory roots
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223 base
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224 envvar)
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225 (paths-find-version-directory roots
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226 system-configuration
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227 envvar)))
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228
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229 (defun construct-emacs-version-name ()
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230 "Construct the raw XEmacs version number."
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231 (concat emacs-program-name "-" emacs-program-version))
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232
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233 (defun paths-directories-which-exist (directories)
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234 "Return the directories among DIRECTORIES."
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235 (let ((reverse-directories '()))
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236 (while directories
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237 (if (paths-file-readable-directory-p (car directories))
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238 (setq reverse-directories
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239 (cons (car directories)
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240 reverse-directories)))
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241 (setq directories (cdr directories)))
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242 (reverse reverse-directories)))
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243
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244 (defun paths-uniq-append (list-1 list-2)
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245 "Append LIST-1 and LIST-2, omitting duplicates."
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246 (let ((reverse-survivors '()))
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247 (while list-2
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248 (if (null (member (car list-2) list-1))
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249 (setq reverse-survivors (cons (car list-2) reverse-survivors)))
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250 (setq list-2 (cdr list-2)))
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251 (append list-1
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252 (reverse reverse-survivors))))
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253
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254 (defun paths-filter (predicate list)
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255 "Delete all matches of PREDICATE from LIST."
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256 (let ((reverse-result '()))
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257 (while list
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258 (if (funcall predicate (car list))
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259 (setq reverse-result (cons (car list) reverse-result)))
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260 (setq list (cdr list)))
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261 (nreverse reverse-result)))
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262
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263 (defun paths-decode-directory-path (string &optional drop-empties)
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264 "Split STRING at path separators into a directory list.
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265 Non-\"\" comonents are converted into directory form.
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266 If DROP-EMPTIES is non-NIL, \"\" components are dropped from the output.
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267 Otherwise, they are left alone."
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268 (let* ((components (split-path string))
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269 (directories
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270 (mapcar #'(lambda (component)
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271 (if (string-equal "" component)
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272 component
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273 (file-name-as-directory component)))
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274 components)))
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275 (if drop-empties
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276 (paths-filter #'(lambda (component)
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277 (null (string-equal "" component)))
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278 directories)
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279 directories)))
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280
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281 (defun paths-find-emacs-roots (invocation-directory
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282 invocation-name)
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283 "Find all plausible installation roots for XEmacs."
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284 (let* ((potential-invocation-root
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285 (paths-find-emacs-root invocation-directory invocation-name))
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286 (invocation-roots
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287 (and potential-invocation-root
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288 (list potential-invocation-root)))
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289 (potential-installation-roots
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290 (paths-uniq-append
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291 (and configure-exec-prefix-directory
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292 (list (file-name-as-directory
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293 configure-exec-prefix-directory)))
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294 (and configure-prefix-directory
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295 (list (file-name-as-directory
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296 configure-prefix-directory)))))
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297 (installation-roots
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298 (paths-filter #'paths-emacs-root-p potential-installation-roots)))
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299 (paths-uniq-append invocation-roots
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300 installation-roots)))
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301
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302 ;;; find-paths.el ends here
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