Project idea: github-like diff view

When you view a commit from github, it shows extra info besides standard unified diff format:

- the column number of each line (useful for jumping directly to that
line without manual counting from @@ line)
- --color-words within unified diff format, using background color to
show what part of the line has changed. This is only enabled for
1-line changes.

These can be implemented and seem useful, especially the --color-words item. Once you get familiar with diff.c I suppose you could implement both in a week (the first probably takes just a day).