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Overview

Scion (pronunciation) is a Haskell IDE library. Scion provides services that can be useful for a Haskell IDE. This currently includes:

• Type checking source files and reporting errors and warnings. This may be done incrementally.
• Query information about identifiers at a given location in the file. (E.g., type lookup.)
• Jump to definition (within current project).

Future planned features:

• Automatic import management
• Default fixes for certain error and warning classes. E.g., suggest language extensions.
• Semi-automatic management of .cabal files.
• Profiling and debugging support.
• Refactoring.
• etc.

Scion is based on the GHC API and aims to support many frontends. Scion is implemented as a server and communicates with the frontend via RPC. The frontend can choose between a number of serialisation formats; the current default is JSON. Session state management is handled by the Scion server.

Frontends

Current IDEs/editors using Scion include:

• Emacs. This is included in this repository. Use the standard haskell-mode together with the Scion minor mode)
• Vim. Currently defunct - maintainer wanted.
• Eclipse. Via EclipseFP. Currently uses a fork of Scion.
• Yi. Status unknown.