determining the origin of imported symbols

[Erik Rantapaa]

Hi everyone,

I looking for a way to analyze Haskell source to determine which module each imported symbol comes from. My goal is to transform source code like this:

    import Data.List

    ...
    main = do
      nums <- fmap (map read . words) getLine :: IO [Int]
      print $ sort nums

to code like this:

    import qualified Prelude as B

    import qualified Data.List as A

    ...

    main = do

      nums <- B.fmap (B.map B.read B.. B.words) B.getLine :: B.IO [B.Int]

      B.print B.$ A.sort nums

That is, I want to qualify all imported symbols with a module alias.

Can anyone suggest modules or programs I should look at?

Thanks,
ER

[JP Moresmau]

BuildWrapper doesn't do the transformation, but it resolves all symbols to build a usage map, so it would tell you that Data.List.sort is used at line xxx, using the GHC API. So have a look at around https://github.com/JPMoresmau/BuildWrapper/blob/master/src/Language/Haskell/BuildWrapper/API.hs#L239. BuildWrapper takes the GHC AST, transforms it into a JSON structure, and extracts all usage information. There is also an import reorganization function that may be useful.

JP

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JP Moresmau
http://jpmoresmau.blogspot.com/

[Roman Cheplyaka]

Hi Erik,

haskell-names (https://github.com/haskell-suite/haskell-names) will help you
here.

* Erik Rantapaa <eran...@gmail.com> [2014-07-24 01:29:03-0700]

[Daniel Trstenjak]

Hi Erik,

> Can anyone suggest modules or programs I should look at?

hsimport[1] and especially vim-hsimport[2] might be of help.


Greetings,
Daniel

[1] https://github.com/dan-t/hsimport
[2] https://github.com/dan-t/vim-hsimport

[Eyal Lotem]

There's also ghc's -ddump-minimal-imports which might help you.

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[Erik Rantapaa]

Thanks, everyone, for all of the suggestions!