Migrate ansi mod from alacritty_terminal

[alesharik]

This is continuation of #64 Also this PR:

• adds no_alloc feature disable all things that need allocator
• syncs up ansi module with a reference implementation in alacritty_terminal crate

[chrisduerr]

@alesharik Out of curiosity, do you actually have an application for this personally?

[alesharik]

@chrisduerr Hi, sorry for the delay... Yes, I'm currently using my fork of vte to implement basic terminal in my hobby OS

[chrisduerr]

Do you make use of a custom allocator there, or are you planning to use this without allocator?

[alesharik]

I'm using the crate with custom allocator

[chrisduerr]

Okay, so your usecase would be no_std + alloc then, right?

[alesharik]

Yes, it is

[chrisduerr]

An allocator feature alone might be sufficient in that case. I'm not sure what we need STD for.

[alesharik]

We need std just for Instant struct

[chrisduerr]

That seems like something that could potentially be worked around.

[Andy-Python-Programmer]

Any updates on this? Is this still being worked on?

[chrisduerr]

Is this still being worked on?

I doubt it.