[Haskell-cafe] extracting a single declaration using haskell-src-ext

[Alan & Kim Zimmerman]

This can be done with HaRe, if you use the library version rather than the
built-in refactorings. It does not support 7.8.x though, and the 7.10
support is ongoing.

Alan

On Tue, Mar 17, 2015 at 6:12 PM, Maurizio Vitale <mrz.vtl at gmail.com> wrote:

> G'day!
>
> Is there an easy way to extract a single declaration from an Haskell
> source file and print it with the original formatting?
>
> [I could live with pretty printing, but the default prettyPrint gives me a
> very strange formatting where something like:
> main = do
>   putStrLn "Hello"
> becomes:
> main = do putStrLn "Hello"]
>
> The closest I've got is to parse the file with comments and then get
> inside Module ...decls and do printExact with an empty comment list for the
> decl I'm interested in. This gives me the original formatting and empty
> lines where comments were that I can then remove.
>
> But if there was anything already out there that just take a String for
> the toplevel I'm interested in and convert that only, I'd love to know.
>
> Thanks,
>
>   Maurizio
>
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