JS <[EMAIL PROTECTED]> writes:
> Is it possible to get line numbers in the left margin of emacs??
ISTR that a mode passed on gnu.emacs.sources to do that. Otherwise,
there's the line-number-mode and column-number-mode that display the
line and column number in the mode line. The point is that it's
rather costly to maintain line numbers while editing a buffer: you
have to renumber all lines every time something's cut, pasted or C-o
or RETURN is typed, etc.
You could use this M-x insert-line-numbers command to insert line
numbers, M-x delete-line-numbers to remove them, M-x renumber-lines to
update them.
And M-x local-set-key RET RET lse-newline RET to get new line numbers
inserted automatically when you type return (actually, not _line_
numbers, but a statement number like in LSE or BASIC where you may
number lines 5 b 5 or 10 by 10.
I don't know if there's a way to maintain an area on the screen
distinct from the buffer contents, but scroll-synchronized with the
buffer, like the "fringe", were we could put the line numbers; it
doesn't seems so...
(defun insert-line-numbers ()
(interactive)
(save-excursion
(save-restriction
(widen)
(let ((fmt (format "%%0%dd "
(1+ (truncate
(log (count-lines (point-min) (point-max))
10)))))
(i 0))
(goto-char (point-min))
(while (< (point) (point-max))
(setq i (1+ i))
(insert (format fmt i))
(forward-line))))))
(defun delete-line-numbers ()
(interactive)
(save-excursion
(save-restriction
(widen)
(goto-char (point-min))
(while (< (point) (point-max))
(if (looking-at "[0-9][0-9]* ")
(delete-region (match-beginning 0) (match-end 0)))
(forward-line)))))
(defun renumber-lines ()
(interactive)
(delete-line-numbers)
(insert-line-numbers))
(defun lse-newline ()
"Insert newline and line number incremented with the same step
as previously."
(interactive)
(newline)
(let ((nlpt (point))
(line (progn
(forward-line -1)
(beginning-of-line)
(if (looking-at "[0-9]+")
(let ((curr (string-to-number (match-string 0))))
(forward-line -1)
(beginning-of-line)
(if (looking-at "[0-9]+")
(let ((prev (string-to-number (match-string 0))))
(+ curr (abs (- curr prev))))
(+ 10 curr)))
10))))
(goto-char nlpt)
(beginning-of-line)
(insert (format "%d " line))
(when (looking-at " +")
(delete-region (match-beginning 0) (match-end 0)))));;lse-newline
--
__Pascal Bourguignon__ http://www.informatimago.com/
Nobody can fix the economy. Nobody can be trusted with their finger
on the button. Nobody's perfect. VOTE FOR NOBODY.
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