[issue1987] Add color markup to notify extension

[Stephen]

New submission from Stephen <smullins7 at gmail.com>:

The hg notify extension is really great for sending diffs of commits.
However, it does not use any markup. Using simple highlighting of changed
lines goes a long way for readability.

I'd like to work on adding the ability to use HTML formatting in the output
from notify's diff to make it easier to read. There should be configuration
values for selecting the colors for each part of the diff. I think we'll
need at least the following config added:

filename (lines that start with --- or +++)
old line (lines that start with -)
new/changed line (lines that start with +)
hunks (lines that start @@)

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assignedto: smullins
messages: 11473
nosy: smullins
priority: feature
status: unread
title: Add color markup to notify extension

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Mercurial issue tracker <bugs at mercurial.selenic.com>
<http://mercurial.selenic.com/bts/issue1987>
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