Use prettyprinter instead of ansi-wl-pprint

[jasagredo]

I didn't do anything fancy, just "inlining" what I found in prettyprinter-compat-ansi-wl-pprint.

[jasagredo]

I'm unsure if I was doing something weird, but this module seems to only exist in base >=4.17, that's why I updated this cpp

[phadej]

It is shimmed in https://hackage.haskell.org/package/data-array-byte

[phadej]

I won't accept this change as such. It's a breaking change.

I have thought about how to do this and the streps are:

• add prettyprinter dependency (behind a manual flag) and functionality similarly how there are printers using pretty and ansi-wl-pprint.
• make ansi-wl-pprint dependency behind a flag too (enabled)
• make ansi-wl-pprint flag disabled by default. Later, as that will be a breaking change.

But I'm unsure about this. Maybe I won't do flags, but rather a companion packages.

[phadej]

It is shimmed in https://hackage.haskell.org/package/data-array-byte

[9999years]

Any way to move forward on this? The rest of the ecosystem has moved on but tree-diff has been broken for a year+

[phadej]

has been broken for a year+

What you mean by that? tree-diff uses prettyprint via shim.

[9999years]

@phadej See #91, an upstream change in ansi-wl-pprint means that show no longer renders colored output correctly:

The ansi-wl-pprint changelog for 1.0.2 says that "Using show won't preserve formatting anymore, as prettyprinters Show Doc instance is annotation invariant."

The only way to fix this is by using Prettyprinter.Render.Terminal.renderStrict to render output, which is not exposed from ansi-wl-pprint. I can't see a way around adding an prettyprinter-ansi-terminal dependency.