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From: daloera@athena.mit.edu (Daniel A. Loera)
Newsgroups: comp.emacs,gnu.emacs
Subject: Line and Column numbers
Message-ID: <1990Feb28.123000.15869@athena.mit.edu>
Date: 28 Feb 90 12:30:00 GMT
Sender: news@athena.mit.edu (News system)
Reply-To: daloera@athena.mit.edu (Daniel A. Loera)
Distribution: usa
Organization: Massachusetts Institute of Technology
Lines: 92

I have received the following code from tac@CS.BROWN.EDU.  It is supposed to
put the col and row numbers on the mode line.  What follows is exactly what I
received from him.  You may have to hack around with the code to get it to
work for you.


-> Start of tac@CS.BROWN.EDU's e-mail:


these will do it, but will only be correct for arrow keys, not
for forward-sexp for ex.


(defun teds-forward-char (&rest dummy)
  (interactive)
  (forward-char 1)
  (update-modeline))


(defun teds-backward-char (&rest dummy)
  (interactive)
  (backward-char 1)
  (update-modeline))



(defun teds-previous-line (&rest dummy)
  "Previous-line, maintains column, updates cursor pos"
  (interactive)
  (let ((old-row  0))
     (if (not (or (eq last-command 'teds-previous-line)
                  (eq last-command 'teds-next-line)))
         (setq *column* (current-column)))
     (setq old-row (current-row))
     (previous-line 1)
     (move-to-column *column*)
     (if (and (/= old-row 0) 
              (not (eql (current-window) *keypad-window*)))
         (update-modeline))))


(defun teds-next-line (&rest dummy)
  "Next-line, maintains column, updates cursor pos"
  (interactive)
  (let ((old-row   0))
     (if (not (or (eq last-command 'teds-previous-line)
                  (eq last-command 'teds-next-line)))
          (setq *column* (current-column)))
     (setq old-row (current-row))
     (next-line 1)
     (move-to-column *column*)
     (if (/= old-row (- (window-height) 2))
         (update-modeline))))
  


(defun current-column ()
  "Returns current column #, from 0."
  (let ((pos (dot)))
    (beginning-of-line)
    (prog1 (- pos (dot)) (goto-char pos))))

(defun current-row ()
  "Returns current row #, from screen top, from 0."
  (let* ((pos (point))
         (top (window-start))
         (count 0))
    (beginning-of-line)
    (while (/= (point) top)
        (forward-line -1)
        (setq count (1+ count)))
    (goto-char pos)
    count))

(defun update-modeline ()
  "Update modeline, including cursor position."
  (if (not (eql (current-window) *keypad-window*))
      (setq mode-line-format 
        (cons (concat (format "row %2s " (current-row)) 
                      (format "col %2s " (current-column))) 
              (cdr mode-line-format)))))

;;  (global-unset-key "\M-[")
;;  (global-set-key "\M-[A" 'previous-line)		; r8
;;  (global-set-key "\M-[B" 'next-line)    		; r14
;;  (global-set-key "\M-[C" 'forward-char)		; r12
;;  (global-set-key "\M-[D" 'backward-char)		; r10

- Ted

p.s. anything undefined is probably my own hacks and
     can be ignored.