Done for fun and it is quite useful for me
This is the tool which I needed.
Maybe you will find it usefull too. (however still some work to do…)
“Pretty Diff is here because sometimes you want to share changes in your code with your clients.
The fastest way to do this is to use git diff which is hard to read for non-technical people”
You can export one (pretty) html file with your customized git diff output.
You can also add custom description (with markdown) and title.
Full-feature working demo: http://pretty-diff.meteor.com/
App code: https://github.com/juliancwirko/meteor-pretty-diff-app
Meteor package: https://atmospherejs.com/juliancwirko/pretty-diff