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+;;;; page-ext.el
+
+;;; Page handling commands
+;;; by Robert J. Chassell
+
+;;; You may use these commands to handle an address list or other
+;;; small data base.
+
+;;; Copyright (C) 1990 Free Software Foundation
+;;; Please send bug reports to bob@ai.mit.edu
+
+;;; Change Log ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;
+;;; Version 0.043
+;;; 24 May 1990 - When the cursor is at the end of the pages directory
+;;; buffer (which is empty), a `C-c C-c' (pages-directory-goto)
+;;; command now takes you to the end of the buffer.
+;;;
+;;; Version 0.042
+;;; 16 May 1990 - Since people often handle address and other files
+;;; differently, variable `pages-directory-for-addresses-narrowing-p'
+;;; now specifies whether `pages-directory-goto' should narrow
+;;; addresses buffer to entry to which it goes.
+;;; `pages-directory-buffer-narrowing-p' continues to control
+;;; narrowing of pages buffer.
+;;;
+;;; `add-new-page' documentation string now explains
+;;; that the value of the inserted page-delimiter is a `^L'.
+;;;
+;;; `pages-directory-previous-regexp' definition reworded.
+;;;
+;;; Removed unneeded defvar for `pages-directory-buffer'.
+;;;
+;;; Version 0.041 
+;;; 14 May 1990 - `pages-last-search' bound to nil initially.
+;;; Remove unnecessary lines from `search-pages' definition.
+;;;
+;;; Version 0.04 
+;;; 18 Mar 1990 - `pages-directory' creates a directory for only the
+;;; accessible portion of the buffer; it does not automatically widen
+;;; the buffer.
+;;;  
+;;; However, `pages-directory-for-addresses' does widen the addresses'
+;;; buffer before constructing the addresses' directory.
+;;;
+;;; Version 0.032
+;;; 20 Feb 1990 - `pages-directory-for-addresses' no longer copies
+;;; first line of addresses directory to kill-ring
+;;;
+;;; Remove `(kill-all-local-variables)' line from
+;;; `pages-directory-address-mode' so Emacs will not be told to forget
+;;; the name of the file containing the addresses!
+;;;
+;;; Version 0.031
+;;; 15 Feb 1990 - `pages-directory-goto' no longer erroneously selects
+;;; the entry on the following line when the cursor is at the end of
+;;; the line, but selects the entry on which the cursor rests.  
+;;;
+;;; `pages-directory-address-mode' now sets local variables and enables
+;;; `describe-mode' to describe Addresses Directory mode.
+;;;
+;;; `pages-directory-for-addresses' now sets the buffer-modifed flag
+;;; for the Addresses Directory to nil.
+;;;
+;;; The documentation string for both `pages-directory-mode' and
+;;; `pages-directory-address-mode' now provide a lookup for the
+;;; `pages-directory-goto' keybinding.
+;;;
+;;; Version 0.03
+;;; 10 Feb 1990 - Incorporated a specialized extension of the
+;;; `pages-directory' command called `pages-directory-for-addresses'
+;;; and bound it to ctl-x-ctl-p-map "d" for integration with other
+;;; page functions.  This function finds a file, creates a directory
+;;; for it using the `pages-directory' command, and displays the
+;;; directory.  It is primarily for lists of addresses and the like.
+;;;
+;;; The difference between this and the `pages-directory' command is
+;;; that the `pages-directory-for-addresses' command presumes a
+;;; default addresses file (although you may optionally specify a file
+;;; name) and it switches you to the directory for the file, but the
+;;; `pages-directory' command creates a directory for the current
+;;; buffer, and pops to the directory in another window.
+;;;
+;;; `pages-directory' now places the cursor over the header line of
+;;; the page in which point was located in the pages buffer.
+;;;
+;;; New `set-page-delimiter' command sets  the buffer local value of
+;;; the page-delimiter variable.  With prefix arg, resets function to
+;;; original value.  (Quicker to use than `edit-options'.)
+;;;
+;;; Version 0.02
+;;; 9 Feb 1990 - `pages-directory' now displays the
+;;; first line that contains a non-blank character that follows the
+;;; `page-delimiter'; this may be the rest of the line that contains
+;;; the `page-delimiter' or a line following.  (In most instances, the
+;;; line containing a non-blank character is a line of text.)
+;;; Modification includes changes to `pages-copy-header-and-position'.
+;;;
+;;; Each directory created by `pages-directory' now possesses a name
+;;; derived on the name of the pages buffer.  Consequently, you may
+;;; create several different directories, one for each pages buffer.
+;;;
+;;; `sort-pages-in-region' no longers requires the text to start on
+;;; the line immediately following the line containing the
+;;; page-delimiter.
+;;;
+;;; `pages-directory-goto' no longer narrows to the page
+;;; automatically.  Instead, if you wish it to narrow to the page, set
+;;; variable pages-directory-buffer-narrowing-p to a non-nil value.
+;;; Default is nil; this is an experiment to see whether it is useful
+;;; to see the surrounding context.
+;;;
+;;; Version 0.011
+;;; 2 Feb 1990 - `add-new-page': removed extraneous space.
+;;;
+;;; Version 0.01 
+;;; 28 Jan 1990 - Initial definitions.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+
+;;;; Summary
+
+; The current page commands are:
+
+;     forward-page         C-x ]
+;     backward-page        C-x [
+;     narrow-to-page       C-x p
+;     count-lines-page     C-x l
+;     mark-page            C-x C-p  (change this to C-x C-p C-m)
+;     sort-pages           not bound
+;     what-page            not bound
+
+; The new page handling commands all use `C-x C-p' as a prefix.  This
+; means that the key binding for `mark-page' must be changed.
+; Otherwise, no other changes are made to the current commands or
+; their bindings.
+
+; New page handling commands:
+
+;     next-page                        C-x C-p C-n
+;     previous-page                    C-x C-p C-p
+;     search-pages                     C-x C-p C-s
+;     add-new-page                     C-x C-p C-a
+;     sort-pages-buffer                C-x C-p s      
+;     set-page-delimiter               C-x C-p C-l
+;     pages-directory                  C-x C-p C-d   
+;     pages-directory-for-addresses    C-x C-p d
+;         goto-page                    C-c C-c
+
+
+;;;; Using the page commands
+; 
+; The page commands are helpful in several different contexts.  For
+; example, programmers often divide source files into sections using the
+; `page-delimiter'; you can use the `pages-directory' command to list
+; the sections.
+
+; You may change the buffer local value of the `page-delimiter' with
+; the `set-page-delimiter' command.  This command is bound to `C-x C-p
+; C-l' The command prompts you for a new value for the page-delimiter.
+; Called with a prefix-arg, the command resets the value of the
+; page-delimiter to its original value.
+
+
+;;;; Handling an address list or small data base
+
+; You may use the page commands to handle an address list or other
+; small data base.  Put each address or entry on its own page.  The
+; first line of text in each page is a `header line' and is listed by
+; the `pages-directory' or `pages-directory-for-addresses' command.
+
+; Specifically:
+; 
+;   1. Begin each entry with a `page-delimiter' (which is, by default,
+;      `^L' at the beginning of the line).
+; 
+;   2. The first line of text in each entry is the `heading line'; it
+;      will appear in the pages-directory-buffer which is constructed
+;      using the `C-x C-p C-d' (pages-directory) command or the `C-x
+;      C-p d' (pages-directory-for-addresses) command.
+; 
+;      The heading line may be on the same line as the page-delimiter
+;      or it may follow after.  It is the first non-blank line on the
+;      page.  Conventionally, the heading line is placed on the line
+;      immediately following the line containing page-delimiter.
+;
+;   3. Follow the heading line with the body of the entry.  The body
+;      extends up to the next `page-delimiter'.  The body may be of any
+;      length.  It is conventional to place a blank line after the last
+;      line of the body.
+
+; For example, a file might look like this:
+; 
+;     FSF
+;     Free Software Foundation
+;     675 Massachusetts Avenue
+;     Cambridge, MA 02139  USA
+;     (617) 876-3296
+;     gnu@prep.ai.mit.edu
+; 
+;     
+;     House Subcommittee on Intellectual Property,
+;     U.S. House of Representatives,
+;     Washington, DC  20515
+;     
+;     Congressional committee concerned with permitting or preventing
+;     monopolistic restictions on the use of software technology
+; 
+;     
+;     George Lakoff
+;     ``Women, Fire, and Dangerous Things:
+;     What Categories Reveal about the Mind''
+;     1987, Univ. of Chicago Press
+; 
+;     About philosophy, Whorfian effects, and linguistics.
+; 
+;      
+;     OBI   (On line text collection.)
+;     Open Book Initiative
+;     c/o Software Tool & Die
+;     1330 Beacon St, Brookline, MA 02146 USA
+;     (617) 739-0202 
+;     obi@world.std.com
+
+; In this example, the heading lines are:
+;
+;     FSF
+;     House Subcommittee on Intellectual Property
+;     George Lakoff
+;     OBI (On line text collection.)
+
+; The `C-x C-p s' (sort-pages-buffer) command sorts the entries in the
+; buffer alphabetically.
+
+; You may use any of the page commands, including the `next-page',
+; `previous-page', `add-new-page', `mark-page', and `search-pages'
+; commands.
+
+; You may use either the `C-x C-p d' (pages-directory-for-addresses)
+; or the `C-x C-p C-d' (pages-directory) command to construct and
+; dislay a directory of all the heading lines.
+
+; In the directory, you may position the cursor over a heading line
+; and type `C-c C-c' to go to the entry to which it refers in the
+; pages buffer.
+
+; When used in conjunction with the `pages-directory-for-addresses'
+; command, the `C-c C-c' (pages-directory-goto) command narrows to the
+; entry to which it goes.  But, when used in conjunction with the
+; `pages-directory' command, the `C-c C-c' (pages-directory-goto)
+; command does not narrow to the entry, but widens the buffer so you
+; can see the context surrounding the entry.
+
+; If you wish, you may create several different directories,
+; one for each different buffer.
+
+;; `pages-directory-for-addresses' in detail
+
+; The `pages-directory-for-addresses' assumes a default addresses
+; file.  You do not need to specify the addresses file but merely type
+; `C-x C-p d' from any buffer.  The command finds the file, constructs
+; a directory for it, and switches you to the directory.  If you call
+; the command with a prefix arg, `C-u C-x C-p d', it prompts you for a
+; file name.
+
+;; `pages-directory' in detail
+
+; Call the `pages-directory' from the buffer for which you want a
+; directory created; it creates a directory for the buffer and pops
+; you to the directory.
+
+; The `pages-directory' command has several options:
+
+;   Called with a prefix arg, `C-u C-x C-p C-d', the `pages-directory'
+;   prompts you for a regular expression and only lists only those
+;   header lines that are part of pages that contain matches to the
+;   regexp.  In the example above, `C-u C-x C-p C-d 617 RET' would
+;   match the telephone area code of the first and fourth entries, so
+;   only the header lines of those two entries would appear in the
+;   pages-directory-buffer.
+; 
+;   Called with a numeric argument, the `pages-directory' command
+;   lists the number of lines in each page.  This is helpful when you
+;   are printing hardcopy.  
+
+;   Called with a negative numeric argument, the `pages-directory'
+;   command lists the lengths of pages whose contents match a regexp.
+
+
+;;;; Key bindings for page handling functions
+
+(global-unset-key "\C-x\C-p")
+
+(defvar ctl-x-ctl-p-map (make-sparse-keymap)
+  "Keymap for subcommands of C-x C-p, which are for page handling.")
+
+(define-key ctl-x-map "\C-p" 'ctl-x-ctl-p-prefix)
+(fset 'ctl-x-ctl-p-prefix ctl-x-ctl-p-map)
+
+(define-key ctl-x-ctl-p-map "\C-n" 'next-page)
+(define-key ctl-x-ctl-p-map "\C-p" 'previous-page)
+(define-key ctl-x-ctl-p-map "\C-a" 'add-new-page)
+(define-key ctl-x-ctl-p-map "\C-m" 'mark-page)
+(define-key ctl-x-ctl-p-map "\C-s" 'search-pages)
+(define-key ctl-x-ctl-p-map "s"    'sort-pages-buffer)
+(define-key ctl-x-ctl-p-map "\C-l" 'set-page-delimiter)
+(define-key ctl-x-ctl-p-map "\C-d" 'pages-directory)
+(define-key ctl-x-ctl-p-map "d"    'pages-directory-for-addresses)
+
+
+;;;; Page movement function definitions
+
+(defun next-page (&optional count)
+  "Move to the next page bounded by the `page-delimiter' variable.
+With arg (prefix if interactive), move that many pages."
+  (interactive "p")
+  (or count (setq count 1))
+  (widen)
+  ;; Cannot use forward-page because of problems at page boundaries.
+  (while (and (> count 0) (not (eobp)))
+    (if (re-search-forward page-delimiter nil t)
+        nil
+      (goto-char (point-max)))
+    (setq count (1- count)))
+  (while (and (< count 0) (not (bobp)))
+    (if (re-search-backward page-delimiter nil t)
+	(goto-char (match-beginning 0))
+      (goto-char (point-min)))
+    (setq count (1+ count)))
+  (narrow-to-page)
+  (goto-char (point-min))
+  (recenter 0))
+
+(defun previous-page (&optional count)
+  "Move to the previous page bounded by the `page-delimiter' variable.
+With arg (prefix if interactive), move that many pages."
+  (interactive "p")
+  (or count (setq count 1))
+  (next-page (- count)))
+
+
+;;;; Adding and searching pages
+
+(defun add-new-page (header-line)
+  "Insert new page at point; prompt for header line.
+Page begins with a `^L' as the page-delimiter.  
+Point is left in the body of page."
+  (interactive "sHeader line: ")
+  (widen)
+  (insert (format "\n\n%s\n\n" header-line))
+  ;; don't renarrow; stay unnarrowed to see context
+  (forward-line -1))
+
+(defvar pages-last-search nil
+  "Value of last regexp searched for.  Initially, nil.")
+
+(defun search-pages (regexp)
+  "Search for REGEXP, starting from point, and narrow to page it is in."
+  (interactive (list
+                (read-string
+                 (format "Search for `%s' (end with RET): "
+                         (or pages-last-search "regexp")))))
+  (if (equal regexp "")
+      (setq regexp pages-last-search)
+    (setq pages-last-search regexp))
+  (widen)
+  (re-search-forward regexp)
+  (narrow-to-page))
+
+
+;;;; Sorting pages
+
+(autoload 'sort-subr "sort" "Primary function for sorting." t nil)
+
+(defun sort-pages-in-region (reverse beg end)
+  "Sort pages in region alphabetically.  Prefix arg means reverse order.  
+
+Called from a program, there are three arguments:
+REVERSE (non-nil means reverse order), BEG and END (region to sort)."
+
+;;; This sort function handles ends of pages differently than
+;;; `sort-pages' and works better with lists of addresses and similar
+;;; files.
+
+  (interactive "P\nr")
+  (save-restriction
+    (narrow-to-region beg end)
+    (goto-char (point-min))
+    ;;; `sort-subr' takes three arguments
+    (sort-subr reverse
+
+               ;; NEXTRECFUN is called with point at the end of the
+               ;; previous record. It moves point to the start of the
+               ;; next record.
+	       (function (lambda ()
+                           (re-search-forward page-delimiter nil t)
+                           (skip-chars-forward " \t\n")
+                           ))
+
+               ;; ENDRECFUN is is called with point within the record.
+               ;; It should move point to the end of the record.
+	       (function (lambda ()
+                           (if (re-search-forward
+                                page-delimiter
+                                nil
+                                t)
+                               (goto-char (match-beginning 0))
+                             (goto-char (point-max))))))))
+
+(defun sort-pages-buffer (&optional reverse)
+  "Sort pages alphabetically in buffer.  Prefix arg means reverse order. 
+\(Non-nil arg if not interactive.\)"
+
+  (interactive "P")
+  (or reverse (setq reverse nil))
+  (widen)
+  (let ((beginning (point-min))
+        (end (point-max)))
+    (sort-pages-in-region reverse beginning end)))
+
+
+;;;; Pages directory ancillary definitions
+
+(defvar pages-directory-buffer-narrowing-p nil
+  "*If non-nil, `pages-directory-goto' narrows pages buffer to entry.")
+
+(defvar pages-directory-previous-regexp nil
+  "Value of previous regexp used by `pages-directory'.
+\(This regular expression may be used to select only those pages that
+contain matches to the regexp.\)")
+
+(defvar pages-buffer nil
+  "The buffer for which the pages-directory function creates the directory.")
+
+(defvar pages-directory-prefix "*Directory for:"
+  "Prefix of name of temporary buffer for pages-directory.")
+
+(defvar pages-pos-list nil
+  "List containing the positions of the pages in the pages-buffer.")
+
+(defvar pages-directory-map nil
+  "Keymap for the pages-directory-buffer.")
+
+(if pages-directory-map
+    ()
+  (setq pages-directory-map (make-sparse-keymap))
+  (define-key pages-directory-map "\C-c\C-c"
+    'pages-directory-goto))
+
+(defun set-page-delimiter (regexp reset-p)
+  "Set buffer local value of page-delimiter to REGEXP.
+Called interactively with a prefix argument, reset `page-delimiter' to
+its original value.
+
+In a program, non-nil second arg causes first arg to be ignored and
+resets the page-delimiter to the original value."
+  
+  (interactive
+   (if current-prefix-arg
+       (list original-page-delimiter nil)
+     (list (read-string "Set page-delimiter to regexp: " page-delimiter)
+           nil)))
+  (make-local-variable 'original-page-delimiter)
+  (make-local-variable 'page-delimiter)
+  (setq original-page-delimiter
+        (or original-page-delimiter page-delimiter))
+  (if (not reset-p)
+      (setq page-delimiter regexp)
+    (setq page-delimiter original-page-delimiter))
+  (if (interactive-p)
+      (message "The value of `page-delimiter' is now: %s" page-delimiter)))
+
+
+;;;; Pages directory main definitions
+
+(defun pages-directory
+  (pages-list-all-headers-p count-lines-p &optional regexp)
+  "Display a directory of the page headers in a temporary buffer.
+A header is the first non-blank line after the page-delimiter.
+\\[pages-directory-mode]
+You may move point to one of the lines in the temporary buffer,
+then use \\<pages-directory-goto> to go to the same line in the pages buffer.
+
+In interactive use:
+
+    1. With no prefix arg, display all headers.
+
+    2. With prefix arg, display the headers of only those pages that
+       contain matches to a regular expression for which you are
+       prompted.
+
+    3. With numeric prefix arg, for every page, print the number of
+       lines within each page.
+
+    4. With negative numeric prefix arg, for only those pages that
+       match a regular expression, print the number of lines within
+       each page.
+
+When called from a program, non-nil first arg means list all headers;
+non-nil second arg means print numbers of lines in each page; if first
+arg is nil, optional third arg is regular expression.
+
+If the buffer is narrowed, the `pages-directory' command creates a
+directory for only the accessible portion of the buffer."
+  
+  (interactive
+   (cond ((not current-prefix-arg)
+          (list t nil nil))
+         ((listp current-prefix-arg) 
+          (list nil
+                nil
+                (read-string
+                 (format "Select according to `%s' (end with RET): "
+                         (or pages-directory-previous-regexp "regexp")))))
+         ((> (prefix-numeric-value current-prefix-arg) 0)
+          (list t t nil))
+         ((< (prefix-numeric-value current-prefix-arg) 0)          
+          (list nil
+                t
+                (read-string
+                 (format "Select according to `%s' (end with RET): "
+                         (or pages-directory-previous-regexp "regexp")))))))
+  
+  (if (equal regexp "")
+      (setq regexp pages-directory-previous-regexp)
+    (setq pages-directory-previous-regexp regexp))
+  
+  (if (interactive-p)
+      (message "Creating directory for: %s "
+               (buffer-name)))
+  
+  (let ((buffer (current-buffer))
+        (pages-directory-buffer
+         (concat pages-directory-prefix " " (buffer-name) " "))
+        (linenum 1)
+        (pages-buffer-original-position (point))
+        (pages-buffer-original-page 0))
+    
+    ;; `with-output-to-temp-buffer' binds the value of the variable
+    ;; `standard-output' to the buffer named as its first argument,
+    ;; but does not switch to that buffer.
+    (with-output-to-temp-buffer pages-directory-buffer
+      (save-excursion
+        (set-buffer standard-output)
+        (pages-directory-mode)
+        (insert
+         "==== Pages Directory: use `C-c C-c' to go to page under cursor. ====" ?\n)
+        (setq pages-buffer buffer)
+        (setq pages-pos-list nil))
+      
+      (if pages-list-all-headers-p
+          
+          ;; 1. If no prefix argument, list all headers
+          (save-excursion
+            (goto-char (point-min))
+            
+            ;; (a) Point is at beginning of buffer; but the first
+            ;;     page may not begin with a page-delimiter
+            (save-restriction
+              ;; If page delimiter is at beginning of buffer, skip it
+              (if (and (save-excursion
+                         (re-search-forward page-delimiter nil t))
+                       (= 1 (match-beginning 0)))
+                  (goto-char (match-end 0)))
+              (narrow-to-page)
+              (pages-copy-header-and-position count-lines-p))
+            
+            ;; (b) Search within pages buffer for next page-delimiter
+            (while (re-search-forward page-delimiter nil t)
+              (pages-copy-header-and-position count-lines-p)))
+        
+        ;; 2. Else list headers whose pages match regexp.
+        (save-excursion
+          ;; REMOVED  save-restriction  AND  widen  FROM HERE
+          (goto-char (point-min))
+          
+          ;; (a) Handle first page
+          (save-restriction
+            (narrow-to-page)
+            ;; search for selection regexp
+            (if (save-excursion (re-search-forward regexp nil t))
+                (pages-copy-header-and-position count-lines-p)))
+          
+          ;; (b) Search for next page-delimiter
+          (while (re-search-forward page-delimiter nil t)
+            (save-restriction
+              (narrow-to-page)
+              ;; search for selection regexp
+              (if (save-excursion (re-search-forward regexp nil t))
+                  (pages-copy-header-and-position count-lines-p)
+                )))))
+      
+      (set-buffer standard-output)
+      ;; Put positions in increasing order to go with buffer.
+      (setq pages-pos-list (nreverse pages-pos-list))
+      (if (interactive-p)
+          (message "%d matching lines in: %s"
+                   (length pages-pos-list) (buffer-name buffer))))
+    (pop-to-buffer pages-directory-buffer)
+    (sit-for 0)  ; otherwise forward-line fails if N > window height.
+    (forward-line (if (= 0 pages-buffer-original-page)
+                      1
+                    pages-buffer-original-page))))
+
+(defun pages-copy-header-and-position (count-lines-p)
+  "Copy page header and its position to the Pages Directory.
+Only arg non-nil, count lines in page and insert before header.
+Used by `pages-directory' function."
+  
+  (let (position line-count)
+
+    (if count-lines-p
+        (save-excursion
+          (save-restriction
+            (narrow-to-page)
+            (setq line-count (count-lines (point-min) (point-max))))))
+
+    ;; Keep track of page for later cursor positioning
+    (if (<= (point) pages-buffer-original-position)
+        (setq pages-buffer-original-page
+              (1+ pages-buffer-original-page)))
+    
+    (save-excursion
+      ;; go to first non-blank char after the page-delimiter
+      (skip-chars-forward " \t\n")     
+      ;; set the marker here; this the place to which the
+      ;; `pages-directory-goto' command will go 
+      (setq position (make-marker))
+      (set-marker position (point))
+      (let ((start (point))
+            (end (save-excursion (end-of-line) (point))))
+        ;; change to directory buffer
+        (set-buffer standard-output)
+        ;; record page position 
+        (setq pages-pos-list (cons position pages-pos-list))
+        ;; insert page header
+        (insert-buffer-substring buffer start end))
+      
+      (if count-lines-p
+          (save-excursion
+            (beginning-of-line)
+            (insert (format "%3d: " line-count))))
+      
+      (terpri))
+    (forward-line 1)))
+
+(defun pages-directory-mode ()
+  "Mode for handling the pages-directory buffer.
+
+Move point to one of the lines in this buffer, then use \\[pages-directory-goto] to go
+to the same line in the pages buffer."
+
+  (kill-all-local-variables)
+  (use-local-map pages-directory-map)
+  (setq major-mode 'pages-directory-mode)
+  (setq mode-name "Pages-Directory")
+  (make-local-variable 'pages-buffer)
+  (make-local-variable 'pages-pos-list)
+  (make-local-variable 'pages-directory-buffer-narrowing-p))
+
+(defun pages-directory-goto ()
+  "Go to the corresponding line in the pages buffer."
+
+;;; This function is mostly a copy of `occur-mode-goto-occurrence'
+
+  (interactive)
+  (if (or (not pages-buffer)
+	  (not (buffer-name pages-buffer)))
+      (progn
+	(setq pages-buffer nil
+	      pages-pos-list nil)
+	(error "Buffer in which pages were found is deleted.")))
+  (beginning-of-line)
+  (let* ((pages-number (1- (count-lines (point-min) (point))))
+	 (pos (nth pages-number pages-pos-list))
+         (end-of-directory-p (eobp))
+         (narrowing-p  pages-directory-buffer-narrowing-p))
+    (pop-to-buffer pages-buffer)
+    (widen)
+    (if end-of-directory-p
+        (goto-char (point-max))
+      (goto-char (marker-position pos)))
+    (if narrowing-p (narrow-to-page))))
+
+
+;;;; The `pages-directory-for-addresses' function and ancillary code
+
+(defvar pages-addresses-file-name "~/addresses"
+  "*Standard name for file of addresses.  Entries separated by `page-delimiter'.
+Used by `pages-directory-for-addresses' function.")
+
+(defvar pages-directory-for-addresses-narrowing-p t
+  "*If non-nil, `pages-directory-goto' narrows addresses buffer to entry.")
+
+(defun pages-directory-for-addresses (&optional filename)
+  "Find addresses file and display its directory.
+By default, create and display directory of `pages-addresses-file-name'.
+Optional argument is FILENAME.  In interactive use, with prefix
+argument, prompt for file name and provide completion.
+
+Move point to one of the lines in the displayed directory,
+then use C-c C-c to go to the same line in the addresses buffer."
+
+  (interactive
+   (list (if current-prefix-arg
+             (read-file-name "Filename: " pages-addresses-file-name))))
+
+  (if (interactive-p)
+      (message "Creating directory for: %s "
+               (or filename pages-addresses-file-name)))
+  (if (file-exists-p (or filename pages-addresses-file-name))
+      (progn
+        (set-buffer
+         (find-file-noselect
+          (expand-file-name
+           (or filename pages-addresses-file-name))))
+        (widen)
+        (pages-directory t nil nil)
+        (pages-directory-address-mode)
+        (setq pages-directory-buffer-narrowing-p 
+              pages-directory-for-addresses-narrowing-p)
+        (delete-other-windows)
+        (save-excursion
+          (goto-char (point-min))
+          (delete-region (point) (save-excursion (end-of-line) (point)))
+          (insert
+           "=== Address List Directory: use `C-c C-c' to go to page under cursor. ===")
+          (set-buffer-modified-p nil)
+          ))
+    (error "No addresses file found!")))
+
+(defun pages-directory-address-mode ()
+  "Mode for handling the Addresses Directory buffer.
+
+Move point to one of the lines in this buffer, then use C-c C-c to go
+to the same line in the pages buffer."
+
+  (use-local-map pages-directory-map)
+  (setq major-mode 'pages-directory-address-mode)
+  (setq mode-name "Addresses Directory")
+  (make-local-variable 'pages-buffer)
+  (make-local-variable 'pages-pos-list)
+  (make-local-variable 'pages-directory-buffer-narrowing-p))
+
+;;;;;;;;;;;;;;;; end of page-ext.el ;;;;;;;;;;;;;;;;