Creating a Haskell REPL within a Haskell application

I'm trying to embed a Haskell REPL within one of my Haskell applications. The idea would be that only a subset of the Haskell libraries would be loaded by default, plus my own set of functions, and the user wo开发者_运维问答uld use those in order to interact with the environment.

To solve this problem, I know one way would be to create a (mini-)Haskell parser + evaluator and map my mini-Haskell parser's functions to actual Haskell functions, but I'm sure there is a better way to do this.

Is there a nice and clean way to build a REPL for Haskell using Haskell?

A few things that already exist:

• GHCi, of course, both in the sense of being able to look at how it's implemented or being able to use it directly (i.e., have your REPL just talk to GHCi via stdin/stdout).
• The full GHC API, which lets you hook into GHC and let it do all the heavy lifting for you--loading files, chasing dependencies, parsing, type checking, etc.
• hint, which is a wrapper around a subset of the GHC API, with a focus on interactive interpretation rather than compilation--which seems to fit what you want to do.
• mueval, an evaluator with limits on loaded modules, resource use, etc, basically a "safe" interactive mode. It's what lambdabot uses, if you've ever been in the #haskell IRC channel.

All of the above are assuming that you don't want to deal with writing a Haskell interpreter yourself, which is probably the case.