optional value in CodeAction

[David Smith]

I was having a look into the code to see how hard it would be to implement https://github.com/haskell/haskell-ide-engine/issues/1086 and I got stuck trying to understand CodeAction. With hsimport I want to have the option to add a symbol, that is the name of the function I want to import. Here is an example GHC error message:

    • Variable not in scope:

        readCreateProcessWithExitCode

          :: process-1.6.3.0:System.Process.Common.CreateProcess

             -> [Char] -> IO (ExitCode, String, String)

    • Perhaps you want to add ‘readCreateProcessWithExitCode’

      to the import list in the import of ‘System.Process’

      (src/Interpreter.hs:11:1-27).

In this case I want to construct 2 CodeActions, one that contains only System.Process and another that contains System.Process and readCreateProcessWithExitCode, how would I construct the second one?

Additionally, does ghc-mod return something extra than the ghc error message? I can't understand from https://github.com/haskell/haskell-ide-engine/blob/master/src/Haskell/Ide/Engine/Plugin/HsImport.hs#L135 where it is getting the "Perhaps you meant " part from since that isn't in the ghc error. In that case, how can I go about working out what this message looks like?

[Alan & Kim Zimmerman]

I am going to respond in the issue, as this list is basically not being used.

Alan

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