feat(cli/unstable): Introduce Ansi module

[BlackAsLight]

Read (#6755) for an overview.

There are many static methods and properties here. This is not an exhaustive list of what is available. Nor is everything guaranteed to work in every terminal. But I have tested each one and they all work in my terminal.

This example creates a very big "Hello World!" in terminals that support these Ansi codes.

import * as Ansi from "@std/cli/unstable_ansi";

console.log(
  Ansi.doubleHeightTop +
  "Hello World!\n" +
  Ansi.doubleHeightBottom + 
  "Hello World!",
);

No tests as of yet have been written for this module as I am not sure how to write unit tests to test its behaviour. The codes are either correct or incorrect and whether they work in the terminal is dependent on whether the terminal supports said code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.15%. Comparing base (eccdeff) to head (5c2ba4a).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6756   +/-   ##
=======================================
  Coverage   94.15%   94.15%           
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  Files         587      587           
  Lines       42468    42468           
  Branches     6702     6702           
=======================================
  Hits        39986    39986           
  Misses       2433     2433           
  Partials       49       49           

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[iuioiua]

IMHO, this should be implemented as pure functions and constants, rather than a class. We've also stepped away from using enums in this codebase.

[kt3k]

I agree with @iuioiua . Class usage like this seems strange to me.

[timreichen]

IMHO, this should be implemented as pure functions and constants, rather than a class. We've also stepped away from using enums in this codebase.

I remember a meeting when it was decided to have classes only in std when they have a changeable state (I think it was a discussion about CSV functions vs static class like JSON.
).
import * as Ansi from "..." will group exports together and works similar to an utility class, except functions are tree-shakable and can also be imported separately if needed.

[BlackAsLight]

22 of the 43 codes would just be exporting constant variables.

To add to the enum bit. It is a const enum so it disappears when the code is transpiled. The numbers behind the enum is what's important for the code and using a const enum to represent each number adds to readability.

[CLAassistant]

All committers have signed the CLA.

[BlackAsLight]

I am never attempting a rebase again

[kt3k]

Mostly looks good to me. Left some question

[kt3k]

LGTM

@iuioiua What do you think?

[kt3k]

Let's try and iterate