`rustup target list` output needs an alternative to color

[mqudsi]

Due to presumably the same bug as rust-lang/rust#45728, rustup does not emit color under a correctly-configured tmux (though it will if tmux is misconfigured, as most are), but that's not the issue I'm reporting.

The problem is that the output of rustup target list relies on color to distinguish between installed and uninstalled targets. If color is omitted, the only information discernable from the output is which target is installed and the default, other targets that are installed are displayed the same as targets that aren't.

[amar-laksh]

Output without colour (gnome-terminal):

xterm:

I think this is easy enough to distinguish especially with the default and installed rendered in bold text.

[mqudsi]

That just substitutes one meta property of the text for another. Not all terminals have bold support, copying and pasting loses that bold, etc.

[amar-laksh]

Yeah but again what can we do? Any suggestions? BTW even the linux ttys support bold text.

[mqudsi]

Installed:
  * abc (default)
  * def
Available:
  * foo
  * bar

[mqudsi]

Note that this has already been improved. There was no (installed) at the time I filed this bug.

[amar-laksh]

You should probably close the issue then.