4

I noticed that whenever I narrow a region in emacs, the line numbering is relative to the narrowed region rather than being relative to the original file. Is there any way I can preserve the line numbering from the original buffer ?

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  • 1
    If you don't get an answer, consider making an enhancement request: M-x report-emacs-bug is also for requests.
    – Drew
    Commented Jul 25, 2016 at 20:51
  • @Drew -- Unfortunately, Eli Z. will do nothing to enhance linum.el: debbugs.gnu.org/cgi/bugreport.cgi?bug=17787#8 Perhaps submitting a feature request directly to Stefan for nlinum.el would have better results if that library does not already provide the feature the original poster seeks.
    – lawlist
    Commented Oct 29, 2016 at 4:36
  • 1
    @lawlist: The question does not say that OP is using linum.el. I suggest reporting such an enhancement request for nlinum.el.
    – Drew
    Commented Oct 29, 2016 at 4:52

1 Answer 1

5

A little late, but here's what I have in my .emacs. It does change the numbering for all linum-mode enabled buffers, but that's what I generally want:

(require 'linum)

(defvar my-linum-base-line nil)
(defvar my-linum-format nil)

(add-hook 'linum-before-numbering-hook
          (lambda ()
            (save-excursion
              (save-restriction
                (goto-char (point-min))
                (widen)
                (setq my-linum-base-line (count-lines 1 (point)))
                (setq my-linum-format
                      (format "%%%dd"
                              (length
                               (int-to-string
                                (+ my-linum-base-line
                                   (count-lines (point)
                                                (point-max)))))))))))

(setq-default linum-format
              (lambda (line)
                (format my-linum-format
                        (+ line my-linum-base-line))))

There's probably many things wrong with this in regards to proper elisp use, but it seems to work for me :)

1
  • Note that if your version of Emacs >= 26.1, you can use (setq-default display-line-numbers-widen 't) (Source: emacs.stackexchange.com/a/48591/18064). Not that I have anything against this implementation, just mentioning that current versions of Emacs have it already implemented.
    – colelemonz
    Commented Jan 3, 2022 at 20:49

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