* info.el (Info-directory-list): Doc fix; it is set according to

	INFOPATH, not INFODIR.
	(Info-find-node): Don't try to set the info buffer's directory
	according to Info-directory; that variable doesn't exist any more.
	Instead, let Info-insert-dir set the current directory.
	(Info-insert-dir): Properly check for upper- and lower-case forms
	of "dir", with and without ".info" extension.  Set the buffer's
	default-directory to the directory containing the first dir file
	we find, and cache it in Info-dir-contents-directory.
	(Info-dir-contents-directory): New variable, to cache the
	directory we decided to use as the merged directory's
	default-directory.

1 files changed, 48 insertions, 20 deletions

diff --git a/lisp/info.el b/lisp/info.el
index 5c273913da6..089f2fb6bf7 100644
--- a/lisp/info.el
+++ b/lisp/info.el
@@ -50,8 +50,8 @@ in paths.el.")
 (defvar Info-directory-list nil
   "List of directories to search for Info documentation files.
 nil means not yet initialized.  In this case, Info uses the environment
-variable INFODIR to initialize it, or `Info-default-directory-list'
-if there is no INFODIR variable in the environment.")
+variable INFOPATH to initialize it, or `Info-default-directory-list'
+if there is no INFOPATH variable in the environment.")
 
 (defvar Info-current-file nil
   "Info file that Info is now looking at, or nil.")
@@ -153,7 +153,6 @@ to read a file name from the minibuffer."
                     Info-current-subfile nil
                     buffer-file-name nil)
               (erase-buffer)
-              (setq default-directory Info-directory)
               (if (eq filename t)
                   (Info-insert-dir)
                 (insert-file-contents filename t)
@@ -232,35 +231,63 @@ to read a file name from the minibuffer."
           (goto-char (nth 2 hist)))))
   (goto-char (point-min)))
 
-;; Record the contents of the (virtual) dir file,
-;; once we have merged it for the first time,
-;; so we can save time subsequently.
+;; Cache the contents of the (virtual) dir file, once we have merged
+;; it for the first time, so we can save time subsequently.
 (defvar Info-dir-contents nil)
 
+;; Cache for the directory we decided to use for the default-directory
+;; of the merged dir text.
+(defvar Info-dir-contents-directory nil)
+
 ;; Construct the Info directory node by merging the files named `dir'
-;; from various directories.
+;; from various directories.  Set the *info* buffer's
+;; default-directory to the first directory we actually get any text
+;; from.
 (defun Info-insert-dir ()
   (if Info-dir-contents
       (insert Info-dir-contents)
     (let ((dirs Info-directory-list)
           buffers buffer others nodes)
-      ;; Search the directory list for file FILENAME.
+
+      ;; Search the directory list for the directory file.
       (while dirs
-        (setq temp (expand-file-name "dir" (car dirs)))
         ;; Try several variants of specified name.
-        ;; Try downcasing, appending `.info', or both.
-        (cond ((file-exists-p temp)
-               (setq buffers (cons (find-file-noselect temp) buffers)))
-              ((file-exists-p (concat temp ".info"))
-               (setq buffers (cons (find-file-noselect (concat temp ".info"))
-                                   buffers))))
-        (setq dirs (cdr dirs)))
-      ;; Distinguish the dir file that comes with Emacs
-      ;; from all the others.
+        ;; Try upcasing, appending `.info', or both.
+        (let (temp
+              (buffer
+               (cond
+                ((progn (setq temp (expand-file-name "DIR" (car dirs)))
+                        (file-exists-p temp))
+                 (find-file-noselect temp))
+                ((progn (setq temp (expand-file-name "dir" (car dirs)))
+                        (file-exists-p temp))
+                 (find-file-noselect temp))
+                ((progn (setq temp (expand-file-name "DIR.INFO" (car dirs)))
+                        (file-exists-p temp))
+                 (find-file-noselect temp))
+                ((progn (setq temp (expand-file-name "dir.info" (car dirs)))
+                        (file-exists-p temp))
+                 (find-file-noselect temp)))))
+          (if buffer (setq buffers (cons buffer buffers)))
+          (setq dirs (cdr dirs))))
+
+      ;; Distinguish the dir file that comes with Emacs from all the
+      ;; others.  [This sounds like baloney - who knows what order
+      ;; Info-directory-list is in, especially after checking the
+      ;; INFOPATH variable, and why should Emacs's dir be special?  If
+      ;; you understand what this comment should have said, please
+      ;; change it.]
       (setq buffer (car buffers)
             others (cdr buffers))
-      ;; Insert the entire original dir file as a start.
+
+      ;; Insert the entire original dir file as a start; use its
+      ;; default directory as the default directory for the whole
+      ;; concatenation.
       (insert-buffer buffer)
+      (setq Info-dir-contents-directory (save-excursion
+                                          (set-buffer buffer)
+                                          default-directory))
+
       ;; Look at each of the other buffers one by one.
       (while others
         (let ((other (car others)))
@@ -322,7 +349,8 @@ to read a file name from the minibuffer."
       (while buffers
         (kill-buffer (car buffers))
         (setq buffers (cdr buffers))))
-    (setq Info-dir-contents (buffer-string))))
+    (setq Info-dir-contents (buffer-string)))
+  (setq default-directory Info-dir-contents-directory))
 
 (defun Info-read-subfile (nodepos)
   (set-buffer (marker-buffer Info-tag-table-marker))