RE: Grep with matching lines syntax highlighted [snippet]

[Drew Adams]

> You can do (add-hook 'compilation-filter-hook
> 'remove-grep-comments) to _always_ strip the comment lines, if you want to
> avoid using `remove-grep-comments' (that is, `;') each time to do that.
> `remove-grep-comments' does nothing outside of grep-mode, so this
> is benign in other compilation-result buffers.

FYI - I've added a command, bound to `M-;', that toggles this automatic
removal of commented lines.

The toggle command just adds and removes `remove-grep-comments' to and from
`compilation-filter-hook'. It also runs grep again to refresh the output to
have or not have (single-line) comments, according to the toggle.

http://www.emacswiki.org/cgi-bin/wiki/grep%2b.el

(Note: This is for Emacs 22 only.)