Since I'm only ever operating on static data, I'm wondering if I can generate module files that capture the records as a sum type. To access the fields of the records, I could then imagine functions that exhaustively map the constructors to the data.

Do any tools to generate .hs files from CSV or other formats exist? Insofar as this question has been asked before, the recommendation is "use Template Haskell", which makes sense, but is a less complete solution than I'm hoping for.

Here's example of what what would be generated in literal Haskell source:

-- input.csv

name, age, someValue
"abc", 1, 3.0

"xyz3", 99, -5.9

-- Input.hs

module Input where

data Row = R1 | R2

name :: Row -> String

name R1 = "abc"
name R2 = "xyz3"

age :: Row -> Integer

age R1 = 1

age R2 = 99

-- likewise for the function someValue

Thanks,

-M