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267
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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-bases '("RCS" "CVS" "SCCS")
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40 "File bases associated with version control.")
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41
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42 (defun paths-find-recursive-path (directories &optional exclude)
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43 "Return a list of the directory hierarchy underneath DIRECTORIES.
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44 The returned list is sorted by pre-order and lexicographically."
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45 (let ((path '()))
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46 (while directories
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47 (let ((directory (file-name-as-directory
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48 (expand-file-name
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49 (car directories)))))
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50 (if (file-directory-p directory)
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51 (let ((raw-dirs (directory-files directory nil "^[^-.]" nil 'dirs-only))
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52 (reverse-dirs '()))
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53
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54 (while raw-dirs
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55 (if (null (member (car raw-dirs) exclude))
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56 (setq reverse-dirs
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57 (cons (expand-file-name (car raw-dirs) directory)
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58 reverse-dirs)))
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59 (setq raw-dirs (cdr raw-dirs)))
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60
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61 (let ((sub-path
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62 (paths-find-recursive-path (reverse reverse-dirs) exclude)))
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63 (setq path (nconc path
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64 (list directory)
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65 sub-path))))))
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66 (setq directories (cdr directories)))
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67 path))
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68
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69 (defun paths-find-recursive-load-path (directories)
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70 "Construct a recursive load path underneath DIRECTORIES."
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71 (paths-find-recursive-path directories paths-version-control-bases))
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72
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73 (defun paths-emacs-root-p (directory)
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74 "Check if DIRECTORY is a plausible installation root for XEmacs."
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75 (or
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76 ;; installed
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77 (file-directory-p
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78 (concat directory "lib/xemacs-" (construct-emacs-version)))
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79 ;; in-place
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80 (and
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81 (file-directory-p (concat directory "lib-src"))
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82 (file-directory-p (concat directory "lisp"))
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83 (file-directory-p (concat directory "src")))))
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84
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85 (defun paths-find-emacs-root
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86 (invocation-directory invocation-name)
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87 "Find the run-time root of XEmacs."
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88 (let ((maybe-root-1 (file-name-as-directory
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89 (expand-file-name ".." invocation-directory)))
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90 (maybe-root-2 (file-name-as-directory
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91 (expand-file-name "../.." invocation-directory))))
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92 (cond
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93 ((paths-emacs-root-p maybe-root-1)
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94 maybe-root-1)
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95 ((paths-emacs-root-p maybe-root-2)
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96 maybe-root-2)
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97 (t
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98 (let ((maybe-symlink (file-symlink-p (concat invocation-directory
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99 invocation-name))))
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100 (if maybe-symlink
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101 (let ((directory (file-name-directory maybe-symlink)))
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102 (paths-find-emacs-root directory invocation-name))
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103 nil))))))
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104
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105 (defun paths-construct-emacs-directory (root suffix base)
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106 "Construct a directory name within the XEmacs hierarchy."
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107 (file-name-as-directory
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108 (expand-file-name
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109 (concat
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110 (file-name-as-directory root)
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111 suffix
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112 base))))
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113
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114 (defun paths-find-emacs-directory (roots suffix base &optional envvar default)
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115 "Find a directory in the XEmacs hierarchy.
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116 ROOTS must be a list of installation roots.
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117 SUFFIX is the subdirectory from there.
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118 BASE is the base to look for.
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119 ENVVAR is the name of the environment variable that might also
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120 specify the directory.
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121 DEFAULT is a fall-back value."
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122 (let ((envvar-value (and envvar (getenv envvar))))
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123 (if (and envvar-value
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124 (file-directory-p envvar-value))
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125 (file-name-as-directory envvar-value)
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126 (catch 'gotcha
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127 (while roots
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128 (let* ((root (car roots))
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129 (path (paths-construct-emacs-directory root suffix base)))
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130 ;; installed
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131 (if (file-directory-p path)
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132 (throw 'gotcha path)
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133 (let ((path (paths-construct-emacs-directory root "" base)))
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134 ;; in-place
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135 (if (file-directory-p path)
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136 (throw 'gotcha path)))))
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137 (setq roots (cdr roots)))
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138 (if (and default
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139 (file-directory-p default))
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140 (file-name-as-directory default)
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141 nil)))))
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142
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143 (defun paths-find-site-directory (roots base &optional envvar default)
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144 "Find a site-specific directory in the XEmacs hierarchy."
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145 (paths-find-emacs-directory roots "lib/xemacs/" base envvar default))
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146
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147 (defun paths-find-version-directory (roots base &optional envvar default)
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148 "Find a version-specific directory in the XEmacs hierarchy."
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149 (paths-find-emacs-directory roots
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150 (concat "lib/xemacs-" (construct-emacs-version) "/")
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151 base
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152 envvar default))
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153
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154 (defun paths-find-architecture-directory (roots base &optional envvar default)
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155 "Find an architecture-specific directory in the XEmacs hierarchy."
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156 (or
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157 ;; from more to less specific
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158 (paths-find-version-directory roots
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159 (concat base system-configuration)
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160 envvar default)
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161 (paths-find-version-directory roots
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162 system-configuration
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163 envvar default)
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164 (paths-find-version-directory roots
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165 base
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166 envvar default)))
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167
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168 (defvar paths-path-emacs-version nil
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169 "Emacs version as it appears in paths.")
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170
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171 (defun construct-emacs-version ()
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172 "Construct the raw version number of XEmacs in the form XX.XX."
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173 ;; emacs-version isn't available early, but we really don't care then
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174 (if (null (boundp 'emacs-version))
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175 "XX.XX"
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176 (or paths-path-emacs-version ; cache
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177 (progn
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178 (string-match "\\`[^0-9]*\\([0-9]+\\.[0-9]+\\)" emacs-version)
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179 (let ((version (substring emacs-version
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180 (match-beginning 1) (match-end 1))))
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181 (if (string-match "(beta *\\([0-9]+\\))" emacs-version)
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182 (setq version (concat version
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183 "-b"
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184 (substring emacs-version
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185 (match-beginning 1) (match-end 1)))))
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186 (setq paths-path-emacs-version version)
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187 version)))))
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188
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189 (defun paths-find-emacs-path (roots suffix base &optional envvar default)
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190 "Find a path in the XEmacs hierarchy.
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191 ROOTS must be a list of installation roots.
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192 SUFFIX is the subdirectory from there.
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193 BASE is the base to look for.
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194 ENVVAR is the name of the environment variable that might also
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195 specify the path.
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196 DEFAULT is a fall-back value."
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197 (let ((envvar-value (and envvar (getenv envvar))))
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198 (if envvar-value
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199 (decode-path-internal envvar-value)
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200 (let ((directory (paths-find-emacs-directory roots base suffix)))
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201 (if (and directory (file-directory-p directory))
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202 (list directory)
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203 (paths-directories-which-exist default))))))
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204
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205 (defun paths-directories-which-exist (directories)
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206 "Return the directories among DIRECTORIES."
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207 (let ((reverse-directories '()))
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208 (while directories
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209 (if (file-directory-p (car directories))
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210 (setq reverse-directories
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211 (cons (car directories)
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212 reverse-directories)))
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213 (setq directories (cdr directories)))
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214 (reverse reverse-directories)))
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215
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216 (defun paths-find-site-path (roots base &optional envvar default)
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217 "Find a path underneath the site hierarchy."
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218 (paths-find-emacs-path roots "lib/xemacs/" base envvar default))
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219
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220 (defun paths-find-version-path (roots base &optional envvar default)
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221 "Find a path underneath the site hierarchy."
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222 (paths-find-emacs-path roots
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223 (concat "lib/xemacs-" (construct-emacs-version) "/")
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224 base
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225 envvar default))
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226
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227 (defun paths-find-emacs-roots (invocation-directory
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228 invocation-name)
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229 "Find all plausible installation roots for XEmacs."
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230 (let ((invocation-root
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231 (paths-find-emacs-root invocation-directory invocation-name))
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232 (installation-root
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233 (if (and configure-prefix-directory
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234 (file-directory-p configure-prefix-directory))
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235 configure-prefix-directory)))
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236 (append (and invocation-root
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237 (list invocation-root))
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238 (and installation-root
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239 (list installation-root)))))
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240
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241 ;;; find-paths.el ends here
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