Change username color to RED when su to root

[Halfwalker]

Change the default username color to something like blue (via variable, so it's changeable). Then, when user su's to root or logs in as root, change username color to RED. This would be a good visual warning that you might be doing something with root privs by mistake ...

So the _username function would check the euid, and if 0 set color to RED

[gpakosz]

Actually a dupe of #155

You can combine #{?} and #{==:}:

tmux_conf_theme_status_right='#{?#{==:#{username},root},#[fg=red],}#{username}#[inherit]'

I'm not sure how I want to generalize this. This doesn't compose well with segment colors