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    <p>I've derived this answer from my previous answer to <a href="https://stackoverflow.com/questions/6874516/relative-line-numbers-in-emacs/6928112#6928112">Relative Line Numbers In Emacs</a>, as it deals with the same issue of remembering the current line number during the linum format process.</p> <p>I'm inheriting from the <code>linum</code> face, but using the background colour from <code>hl-line</code>. If the foreground and background don't match nicely, you can assign a foreground colour explicitly with<br> <kbd>M-x</kbd> <code>customize-face</code> <kbd>RET</kbd> <code>my-linum-hl</code> <kbd>RET</kbd></p> <pre class="lang-el prettyprint-override"><code>(require 'hl-line) (defface my-linum-hl `((t :inherit linum :background ,(face-background 'hl-line nil t))) "Face for the current line number." :group 'linum) (defvar my-linum-format-string "%3d") (add-hook 'linum-before-numbering-hook 'my-linum-get-format-string) (defun my-linum-get-format-string () (let* ((width (1+ (length (number-to-string (count-lines (point-min) (point-max)))))) (format (concat "%" (number-to-string width) "d"))) (setq my-linum-format-string format))) (defvar my-linum-current-line-number 0) (setq linum-format 'my-linum-format) (defun my-linum-format (line-number) (propertize (format my-linum-format-string line-number) 'face (if (eq line-number my-linum-current-line-number) 'my-linum-hl 'linum))) (defadvice linum-update (around my-linum-update) (let ((my-linum-current-line-number (line-number-at-pos))) ad-do-it)) (ad-activate 'linum-update) </code></pre> <p>As with that other answer, this is more efficient in generating the dynamic width than the default <code>dynamic</code> format, but you can use a static width for maximum speed by commenting out the line <code>(add-hook linum-before-numbering-hook 'my-linum-get-format-string)</code> (and optionally modify the initial value of <code>my-linum-format-string</code> to set your preferred width).</p>
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    1. COThanks! Excellent work! BTW - the idea is to use it *instead* hl-line (or with underlining of the current line instead of highlighting).
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    2. COI thought that might be the case. As-is, this will work happily with or without `hl-line` active, but if you wanted to avoid even loading the `hl-line` library, you could delete the `(require 'hl-line)` and change `,(face-background 'hl-line nil t)` to a hard-coded value.
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