Emacs package: extra functionality for occur
Emacs Lisp
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occur-x.el adds some extra functionality to occur-mode. It allows the user to refine any occur mode with extra regexp based filters. Use commands occur-x-filter-out and occur-x-filter to add positive and negative filters. By default those commands are bind to keys "f" and "k" (from flush and keep). Use command occur-x-undo-filter to remove filters. Filters are kept if the buffer is reverted (shortcut "g") or cloned (shortcut "c").

Another useful addition of occur-x to occur-mode is the possibility to displaying the line numbers in the margin of your choice, instead of "inside" the occur buffer. This way every match line in the occur buffer is exactly the same as in the original buffer. Customize variable occur-linenumbers-in-margin and face occur-margin-face to your liking. When displayed in the margin, line numbers won't interfere with the regexps of the additional filters.


Add occur-x.el to your load-path and this line to your config file:

(require 'occur-x)
(add-hook 'occur-mode-hook 'turn-on-occur-x-mode)


To refine your occur buffer, removing or keeping lines that match any regular expression of your choice, press "k" ([K]eep) or "f" ([F]lush). Press "u" to undo the last filter in the stack.


Use function occur-x-enable to toggle on or off this functionality.

Type M-x customize-variable RET occur-linenumbers-in-margin to customize where the line numbers should appear. Type M-x customize-face RET occur-margin-face if you want another face for line numbers when they are in a margin.


Ideas, bug reports, patches, etc. are most welcomed