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copied!<p>This command will do something like you want.</p> <pre><code>(defun annotate-todo () "put fringe marker on TODO: lines in the curent buffer" (interactive) (save-excursion (goto-char (point-min)) (while (re-search-forward "TODO:" nil t) (let ((overlay (make-overlay (- (point) 5) (point)))) (overlay-put overlay 'before-string (propertize "A" 'display '(left-fringe right-triangle))))))) </code></pre> <p>You can <a href="http://www.gnu.org/software/emacs/elisp/html_node/Customizing-Bitmaps.html#Customizing-Bitmaps" rel="noreferrer">customize the bitmap</a> as desired.</p> <p>To get this to apply to all files, you could add it to the <code>'find-file-hooks</code></p> <pre><code>(add-hook 'find-file-hooks 'annotate-todo) </code></pre> <p>Or, if you want it just for certain modes, you could add it to those mode hooks.</p> <p>See <a href="http://www.gnu.org/software/emacs/elisp/html_node/Fringes.html#Fringes" rel="noreferrer">Fringes</a>, <a href="http://www.gnu.org/software/emacs/elisp/html_node/Display-Property.html" rel="noreferrer">The 'display' Property</a>, <a href="http://www.gnu.org/s/emacs/manual/html_node/elisp/Overlays.html#Overlays" rel="noreferrer">Overlays</a>, and most importantly the <a href="http://www.gnu.org/s/emacs/manual/html_node/elisp/Overlay-Properties.html#Overlay-Properties" rel="noreferrer">before-string</a> property.</p> <p><em>Note:</em> The code was updated 27/02/2010 to use overlays instead of directly adding text properties to the current text.</p>

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