hs-jq

The purpose of this project is to create a competing implementation of jq, the command-line JSON processor.

Check it out

There is currently no executable. To see the tests that pass you can:

$ git clone https://github.com/sshine/hs-jq.git
$ cd hs-jq
$ stack test

Why?

I think jq is a really cool domain-specific language, but I'm really bad at it.

Maybe if I write an interpreter for it, I will become better at it.
This implementation can
- confirm that the original jq implementation works as intended.
- document the original jq syntax as documented in JBOL.
Writing property-based tests in Haskell is a lot more convenient than doing so in C. This will give me an opportunity to experiment with hedgehog. For example, I might like to write a generator of JSON values where lists of objects share the same structure (reflecting JSON documents that jq is suitable to transform), and given such a JSON value, I might like to write a generator of jq expressions that validly address such a value.
It would be really cool if you could transform Aeson Values using a quasi-quoter. This would give me a chance to explore how quasi-quoters work in Haskell.
```
slugs :: Value -> Either JqError Value
slugs = [jq| [ .exercises[] | .slug ] |]
```

Comparable projects

stedolan/jq: "Command-line JSON processor"
chrisdone/jl: "Functional sed for JSON"
haskell-works/hw-jq: From 2017, appears very similar to this project.

Status

Parser: 143 out of 436 tests failed.

Contributing