Upgrade optparse-applicative to use prettyprinter and add support for structured CLI help output

[newhoggy]

Internal if an IOHK staff member.

Area
CLI Help

Description
We need a version of optparse-applicative that is able to print structured CLI output that makes large CLI help documents easier to read.

At the moment, optparse-applicative is dependent on ansi-wl-pprint which is deprecated, and is fairly unwieldy providing very limited control over the output. Previous attempts at making ansi-wl-print properly layout structured CLI output have failed.

In order to get this working, we need to switch optparse-applicative to use prettyprinter, and then make modifications to the optparse-applicative code to perform the desired layout.

We have this in a fork, but to be sustainable, this needs to merge upstream.

Some effort to that end has been done here, but some effort needs to be spent to push this forward:

• Pretty printer library switch with ANSI compatibility pcapriotti/optparse-applicative#428
• Re-export pack, unpack and Text from Data.Text haskell-prettyprinter/prettyprinter#208

[github-actions]

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[carbolymer]

optparse-applicative is using prettyprinter now.