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   1 ;;; find-paths.el --- setup various XEmacs paths
   2
   3 ;; Copyright (C) 1985-1986, 1990, 1992-1997 Free Software Foundation, Inc.
   4 ;; Copyright (c) 1993, 1994 Sun Microsystems, Inc.
   5 ;; Copyright (C) 1995 Board of Trustees, University of Illinois
   6
   7 ;; Author: Mike Sperber <sperber@informatik.uni-tuebingen.de>
   8 ;; Maintainer: XEmacs Development Team
   9 ;; Keywords: internal, dumped
  10
  11 ;; This file is part of XEmacs.
  12
  13 ;; XEmacs is free software; you can redistribute it and/or modify it
  14 ;; under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation; either version 2, or (at your option)
  16 ;; any later version.
  17
  18 ;; XEmacs is distributed in the hope that it will be useful, but
  19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21 ;; General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with XEmacs; see the file COPYING.  If not, write to the
  25 ;; Free Software Foundation, 59 Temple Place - Suite 330,
  26 ;; Boston, MA 02111-1307, USA.
  27
  28 ;;; Synched up with: Not in FSF.
  29
  30 ;;; Commentary:
  31
  32 ;; This file is dumped with XEmacs.
  33
  34 ;; This file contains the library functionality to find paths into the
  35 ;; XEmacs hierarchy.
  36 \f
  37 ;;; Code:
  38
  39 (defvar paths-version-control-filename-regexp
  40   "^\\(RCS\\|CVS\\|SCCS\\)$"
  41   "File bases associated with version control.")
  42
  43 (defvar paths-lisp-filename-regexp
  44   "^\\(.*\\.elc?\\)$"
  45   "File bases that contain Lisp file.")
  46
  47 (defvar paths-no-lisp-directory-regexp
  48   (concat "\\(" paths-version-control-filename-regexp "\\)"
  49           "\\|"
  50           "\\(" paths-lisp-filename-regexp "\\)")
  51   "File bases that may not be directories containing Lisp code.")
  52
  53 (defun paths-find-recursive-path (directories &optional max-depth exclude-regexp)
  54   "Return a list of the directory hierarchy underneath DIRECTORIES.
  55 The returned list is sorted by pre-order and lexicographically.
  56 MAX-DEPTH limits the depth of the search to MAX-DEPTH level,
  57 if it is a number.  If MAX-DEPTH is NIL, the search depth is unlimited.
  58 EXCLUDE-REGEXP is a regexp that matches directory names to exclude
  59 from the search."
  60   (let ((path '()))
  61     (while directories
  62       (let ((directory (file-name-as-directory
  63                         (expand-file-name
  64                          (car directories)))))
  65         (if (paths-file-readable-directory-p directory)
  66             (let ((raw-entries
  67                    (if (equal 0 max-depth)
  68                        '()
  69                      (directory-files directory nil "^[^.-]")))
  70                   (reverse-dirs '()))
  71               (while raw-entries
  72                 (if (not (and exclude-regexp
  73                               (string-match exclude-regexp (car raw-entries))))
  74                     (setq reverse-dirs
  75                           (cons (expand-file-name (car raw-entries) directory)
  76                                 reverse-dirs)))
  77                 (setq raw-entries (cdr raw-entries)))
  78
  79               (let ((sub-path
  80                      (paths-find-recursive-path (reverse reverse-dirs)
  81                                                 (if (numberp max-depth)
  82                                                     (- max-depth 1)
  83                                                   max-depth)
  84                                                 exclude-regexp)))
  85                 (setq path (nconc path
  86                                   (list directory)
  87                                   sub-path))))))
  88       (setq directories (cdr directories)))
  89     path))
  90
  91 (defun paths-file-readable-directory-p (filename)
  92   "Check if filename is a readable directory."
  93   (and (file-directory-p filename)
  94        (file-readable-p filename)))
  95
  96 (defun paths-find-recursive-load-path (directories &optional max-depth)
  97   "Construct a recursive load path underneath DIRECTORIES."
  98   (paths-find-recursive-path directories
  99                              max-depth paths-no-lisp-directory-regexp))
 100
 101 (defun paths-emacs-root-p (directory)
 102   "Check if DIRECTORY is a plausible installation root for XEmacs."
 103   (or
 104    ;; installed
 105    (paths-file-readable-directory-p (paths-construct-path (list directory
 106                                                                 "lib"
 107                                                                 emacs-program-name)))
 108    ;; in-place or windows-nt
 109    (and
 110     (paths-file-readable-directory-p (paths-construct-path (list directory "lisp")))
 111     (paths-file-readable-directory-p (paths-construct-path (list directory "etc"))))))
 112
 113 (defun paths-root-in-place-p (root)
 114   "Check if ROOT is an in-place installation root for XEmacs."
 115   (paths-file-readable-directory-p (paths-construct-path (list root "lisp"))))
 116
 117 (defun paths-chase-symlink (file-name)
 118   "Chase a symlink until the bitter end."
 119       (let ((maybe-symlink (file-symlink-p file-name)))
 120         (if maybe-symlink
 121             (let* ((directory (file-name-directory file-name))
 122                    (destination (expand-file-name maybe-symlink directory)))
 123               (paths-chase-symlink destination))
 124           file-name)))
 125
 126 (defun paths-find-emacs-root
 127   (invocation-directory invocation-name)
 128   "Find the run-time root of XEmacs."
 129   (let* ((executable-file-name (paths-chase-symlink
 130                                 (concat invocation-directory
 131                                         invocation-name)))
 132          (executable-directory (file-name-directory executable-file-name))
 133          (maybe-root-1 (file-name-as-directory
 134                         (paths-construct-path '("..") executable-directory)))
 135          (maybe-root-2 (file-name-as-directory
 136                         (paths-construct-path '(".." "..") executable-directory))))
 137     (or (and (paths-emacs-root-p maybe-root-1)
 138              maybe-root-1)
 139         (and (paths-emacs-root-p maybe-root-2)
 140              maybe-root-2))))
 141
 142 (defun paths-construct-path (components &optional expand-directory)
 143   "Convert list of path components COMPONENTS into a path.
 144 If EXPAND-DIRECTORY is non-NIL, use it as a directory to feed
 145 to EXPAND-FILE-NAME."
 146   (let* ((reverse-components (reverse components))
 147          (last-component (car reverse-components))
 148          (first-components (reverse (cdr reverse-components)))
 149          (path
 150           (apply #'concat
 151                  (append (mapcar #'file-name-as-directory first-components)
 152                          (list last-component)))))
 153     (if expand-directory
 154         (expand-file-name path expand-directory)
 155       path)))
 156
 157 (defun paths-construct-emacs-directory (root suffix base)
 158   "Construct a directory name within the XEmacs hierarchy."
 159   (file-name-as-directory
 160    (expand-file-name
 161     (concat
 162      (file-name-as-directory root)
 163      suffix
 164      base))))
 165
 166 (defun paths-find-emacs-directory (roots suffix base
 167                                    &optional envvar default keep-suffix
 168                                              in-place-external)
 169   "Find a directory in the XEmacs hierarchy.
 170 ROOTS must be a list of installation roots.
 171 SUFFIX is the subdirectory from there.
 172 BASE is the base to look for.
 173 ENVVAR is the name of the environment variable that might also
 174 specify the directory.
 175 DEFAULT is the preferred value.
 176 If KEEP-SUFFIX is non-nil, the suffix must be respected in searching
 177 the directory.
 178 If IN-PLACE-EXTERNAL is non-nil, the directory might be found outside
 179 an in-place root-hierarchy."
 180   (let ((preferred-value (or (and envvar (getenv envvar))
 181                              default)))
 182     (if (and preferred-value
 183              (paths-file-readable-directory-p preferred-value))
 184         (file-name-as-directory preferred-value)
 185       (catch 'gotcha
 186         (while roots
 187           (let ((root (car roots)))
 188             ;; installed
 189             (let ((path (paths-construct-emacs-directory root suffix base)))
 190               (if (paths-file-readable-directory-p path)
 191                   (throw 'gotcha path)))
 192             ;; in-place
 193             (if (null keep-suffix)
 194                 (let ((path (paths-construct-emacs-directory root "" base)))
 195                   (if (paths-file-readable-directory-p path)
 196                       (throw 'gotcha path))))
 197             (if (and in-place-external
 198                      (paths-root-in-place-p root))
 199                 (let ((path (paths-construct-emacs-directory
 200                              (paths-construct-path '("..") root)
 201                              "" base)))
 202                   (if (paths-file-readable-directory-p path)
 203                       (throw 'gotcha path)))))
 204           (setq roots (cdr roots)))
 205         nil))))
 206
 207 (defun paths-find-site-directory (roots base &optional envvar default in-place-external)
 208   "Find a site-specific directory in the XEmacs hierarchy.
 209 If IN-PLACE-EXTERNAL is non-nil, the directory might be found outside
 210 an in-place root-hierarchy."
 211   (paths-find-emacs-directory roots
 212                               (file-name-as-directory
 213                                (paths-construct-path (list
 214                                                       "lib"
 215                                                       emacs-program-name)))
 216                               base
 217                               envvar default
 218                               nil
 219                               in-place-external))
 220
 221 (defun paths-find-version-directory (roots base
 222                                      &optional envvar default enforce-version)
 223   "Find a version-specific directory in the XEmacs hierarchy.
 224 If ENFORCE-VERSION is non-nil, the directory must contain the XEmacs version."
 225   (paths-find-emacs-directory roots
 226                               (file-name-as-directory
 227                                (paths-construct-path
 228                                 (list "lib"
 229                                       (construct-emacs-version-name))))
 230                               base
 231                               envvar default
 232                               enforce-version))
 233
 234 (defun paths-find-architecture-directory (roots base &optional envvar default)
 235   "Find an architecture-specific directory in the XEmacs hierarchy."
 236   (or
 237    ;; from more to less specific
 238    (paths-find-version-directory roots
 239                                  (paths-construct-path
 240                                   (list system-configuration base))
 241                                  envvar default)
 242    (paths-find-version-directory roots
 243                                  base
 244                                  envvar)
 245    (paths-find-version-directory roots
 246                                  system-configuration
 247                                  envvar)))
 248
 249 (defun construct-emacs-version-name ()
 250   "Construct the raw XEmacs version number."
 251   (concat emacs-program-name "-" emacs-program-version))
 252
 253 (defun paths-directories-which-exist (directories)
 254   "Return the directories among DIRECTORIES."
 255   (let ((reverse-directories '()))
 256     (while directories
 257       (if (paths-file-readable-directory-p (car directories))
 258           (setq reverse-directories
 259                 (cons (car directories)
 260                       reverse-directories)))
 261       (setq directories (cdr directories)))
 262     (reverse reverse-directories)))
 263
 264 (defun paths-uniq-append (list-1 list-2)
 265   "Append LIST-1 and LIST-2, omitting duplicates."
 266   (let ((reverse-survivors '()))
 267     (while list-2
 268       (if (null (member (car list-2) list-1))
 269           (setq reverse-survivors (cons (car list-2) reverse-survivors)))
 270       (setq list-2 (cdr list-2)))
 271     (append list-1
 272             (reverse reverse-survivors))))
 273
 274 (defun paths-filter (predicate list)
 275   "Delete all matches of PREDICATE from LIST."
 276   (let ((reverse-result '()))
 277     (while list
 278       (if (funcall predicate (car list))
 279           (setq reverse-result (cons (car list) reverse-result)))
 280       (setq list (cdr list)))
 281     (nreverse reverse-result)))
 282
 283 (defun paths-decode-directory-path (string &optional drop-empties)
 284   "Split STRING at path separators into a directory list.
 285 Non-\"\" components are converted into directory form.
 286 If DROP-EMPTIES is non-NIL, \"\" components are dropped from the output.
 287 Otherwise, they are left alone."
 288   (let* ((components (split-path string))
 289          (directories
 290           (mapcar #'(lambda (component)
 291                       (if (string-equal "" component)
 292                           component
 293                         (file-name-as-directory component)))
 294                   components)))
 295     (if drop-empties
 296         (paths-filter #'(lambda (component)
 297                           (null (string-equal "" component)))
 298                       directories)
 299       directories)))
 300
 301 (defun paths-find-emacs-roots (invocation-directory
 302                                invocation-name)
 303   "Find all plausible installation roots for XEmacs."
 304   (let* ((potential-invocation-root
 305           (paths-find-emacs-root invocation-directory invocation-name))
 306          (invocation-roots
 307           (and potential-invocation-root
 308                (list potential-invocation-root)))
 309          (potential-installation-roots
 310           (paths-uniq-append
 311            (and configure-exec-prefix-directory
 312                 (list (file-name-as-directory
 313                        configure-exec-prefix-directory)))
 314            (and configure-prefix-directory
 315                 (list (file-name-as-directory
 316                        configure-prefix-directory)))))
 317          (installation-roots
 318           (paths-filter #'paths-emacs-root-p potential-installation-roots)))
 319     (paths-uniq-append invocation-roots
 320                        installation-roots)))
 321
 322 ;;; find-paths.el ends here