[Nix] Add better prompt default for nix shell
Summary:
Provide better prompt default so that it doesn't look
hideous for users which don't have a configured ~/.bashrc
First run
After changing the font
After reverting back to my normal setup
Test Plan:
# Ensure that ~/.bashrc won't affect logic
# Should only be necessary if personally configured
[[ -f ~/.bashrc ]] && mv ~/.bashrc ~/.bashrc.bak
# from any branch
nix develop 'github.com:commE2E/comm?ref=jonringer/better-prompt'
# Prompt should look decent
# restore old bashrc
[[ -f ~/.bashrc.bak ]] && mv ~/.bashrc{.bak,}Reviewers: abosh, atul, ashoat
Reviewed By: abosh, ashoat
Subscribers: tomek, adrian
Differential Revision: https://phab.comm.dev/D4790