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;; Port this functionality back from Emacs 23 since it's Really Useful
(unless (functionp 'locate-dominating-file)
(defun locate-dominating-file (file name)
"Look up the directory hierarchy from FILE for a file named NAME.
Stop at the first parent directory containing a file NAME,
and return the directory. Return nil if not found."
;; We used to use the above locate-dominating-files code, but the
;; directory-files call is very costly, so we're much better off doing
;; multiple calls using the code in here.
;;
;; Represent /home/luser/foo as ~/foo so that we don't try to look for
;; `name' in /home or in /.
(setq file (abbreviate-file-name file))
(let ((root nil)
(prev-file file)
;; `user' is not initialized outside the loop because
;; `file' may not exist, so we may have to walk up part of the
;; hierarchy before we find the "initial UID".
(user nil)
try)
(while (not (or root
(null file)
;; FIXME: Disabled this heuristic because it is sometimes
;; inappropriate.
;; As a heuristic, we stop looking up the hierarchy of
;; directories as soon as we find a directory belonging
;; to another user. This should save us from looking in
;; things like /net and /afs. This assumes that all the
;; files inside a project belong to the same user.
;; (let ((prev-user user))
;; (setq user (nth 2 (file-attributes file)))
;; (and prev-user (not (equal user prev-user))))
(string-match locate-dominating-stop-dir-regexp file)))
(setq try (file-exists-p (expand-file-name name file)))
(cond (try (setq root file))
((equal file (setq prev-file file
file (file-name-directory
(directory-file-name file))))
(setq file nil))))
root))
(defvar locate-dominating-stop-dir-regexp
"\\`\\(?:[\\/][\\/][^\\/]+\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'"))
(provide 'dominating-file)
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