feat: Add operating system module

[exincore]

Description

The os module shows the current operating system.
OS information is detected via the os_info crate.

Disabled by default due to os_info inaccuracies for the time being.

NOTE: os_info v3.5.0 should have much improved detection, but this remains to be confirmed

Motivation and Context

Inspired by os_icon 'segment' of romkatv/powerlevel10k

Fixes #4292

Screenshots:

How Has This Been Tested?

• I have tested using MacOS
• I have tested using Linux
• I have tested using Windows

Checklist:

• I have updated the documentation accordingly.
• I have updated the tests accordingly.

[andytom]

I have only had a quick look but think we need to think about the default configuration here we are moving away from using nerd fonts (see #3544). However happy to see this module happening we seem to get a lot of questions/requests for this feature.

[exincore]

Ah, well I have exactly what you request (probably)! I spent a good few hours coming up with a reasonable list of emojis that represent the operating systems instead of nerd font. I have yet to finalize my edits to the Presets themselves, but you can see the emoji list is implemented as one of the modules/os.rs tests

[exincore]

I'm not quite sure how to handle updates to the os_info crate adding new os_info::Type enum options. Perhaps a comment on the crate in cargo.toml to caution that if new options were added, new default symbols should be created, tests updated, config schema updated, etc...?

[davidkna]

I'm not quite sure how to handle updates to the os_info crate adding new os_info::Type enum options. Perhaps a comment on the crate in cargo.toml to caution that if new options were added, new default symbols should be created, tests updated, config schema updated, etc...?

I think a comment is fine, most popular os-types are already covered. Maybe a macro can handle detecting this?

[exincore]

Docs may be typeset weirdly; I don't think this is terribly important though.

[exincore]

@davidkna I think the CI tests screwed up? Could you run them again?

[andytom]

LGTM

[andytom]

Thank you for your contribution @exincore and thank you for reviewing @davidkna.

[fadeevab]

@andytom @exincore It's inspiring that Nerd fonts have actual logos for OSes:

There are Windows and Apple logs too.

What about to utilize them instead of standard emojis? You already use Nerd-specific symbols for Rust and NodeJS and other.

Here is how I trick the shell module:

Although, I find pretty convenient to use specific brand icons for cmd and powershell while using Ubuntu symbol for bash.

From this point of view, it would be cool to introduce an $os variable to the shell module to use OS as an icon for some shells.

[exincore]

@fadeevab The list of Nerd Font operating system symbols is provided within the preset "Nerd Font Symbols"; one may copy the [os.symbols] section into one's own starship.toml. Starship is moving towards emoji as default, so that Nerd Font is not a default requirement; see #3544 .

As for implementing os in the shell module, that will likely not happen. I actually use both the os and shell module side by side to get a quick glance at what commands I can expect to use on a particular system.

In this case, Fedora with Fish.

[fadeevab]

@exincore Gotcha. If you don't mind, I have a question: now, the shell module's default symbols are actual words like bsh, fsh, etc. Is there a chance to make emoji/nerd icons by default in the shell module, so it would look similarly to what on your screenshot? It would be more consistent to overall ideology and design (we have a Nerd icon for Rust, not rst word, don't we).

UPD: Just used your way using both shell and os modules, it looks neat.

[exincore]

@fadeevab I apologize for the delay. I would suggest bringing these topics up in the Starship discord server. I am merely a lowly contributor and I do not manage design decisions.