Pretty printing

[sharkdp]

Considering advantages of FlareCheck over testing in psci, there is certainly one field where we could make use of the browser environment: showing the output in useful/nice ways.

For example:

• Pretty-print complex ADTs in a nice way (maybe with parts that can be hidden / folded away). I'm not sure how this can be done in general...
• Render Left (...), Nothing or false with a red background and Right (...), Just (...) and true with a green background.
• Render big arrays/lists in a nice way (hide some elements initially but have a "Full output" button..)

[sharkdp]

Also, one could provide additional information for some types:

Output: "foo"
Type: String
Length: 3

Output: [2.3, 1.5]
Type: Array Number
Length: 2

[sharkdp]

For the ADT part, we can actually use purescript-generics (?).