As expected there was a lot of bikeshedding.
Just change the color of the path, green on success, red on failure.
Constraints taken into account:
- Keep the > for now
- Prompt should be as compact as possible for those of us using 80
column terminals.
- Prompt should not change size between success and error cases
Not taken into account:
- The feature should be accessible to colorblind people (we could
replace the > with another char but we couldn't find something that
looks suitable)