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This is a package for developing Haskell in Emacs. It features a wide a range of tooling, from basic editing to building packages and interactive evaluation.

I really like how organized this effort is. -- basdirks, 2015-10-03

Fast links

• Month in Haskell Mode to know what happened during last full month
• Contributing gives advice how to start helping out
• Current Project focus to understand choices we make
• What users say

All wiki pages →

Manual

• Editing
  • Indentation
    • Basic indentation
    • Block-based indentation
    • Using rectangular region commands
    • Do not use indent-region
    • Aligning code
  • Module templates
  • Autoformatting
• Interaction
  • Haskell Interactive Mode
    • Setup
    • Tags/go to definition
    • Sessions
    • Compiling
      • Load into GHCi
      • Build the Cabal project
      • Reloading modules
      • Jumping to compile errors
      • Auto-removing imports
      • Auto-adding of modules to import
      • Auto-adding of extensions
      • Orphan instances
      • Auto-adding of dependencies
    • REPL
      • Bringing the REPL
      • Evaluating expressions
      • Type of expressions
      • Printing mode
      • Presentations
      • Auto-completion
      • History
      • Cancelling commands
      • Clear the REPL
      • Troubleshooting
    • Querying
      • Get identifer type
      • Insert identifier's type as type signature
      • Get identifier info
      • Presentation mode
      • Browse import's module
    • Cabal integration
      • Cabal building
      • Arbitrary cabal commands
      • Completing cabal commands
    • Debugger
      • Opening the debug buffer
      • Loading modules
      • Setting a breakpoint
      • Start stepping
      • Continue stepping
    • Architecture
  • Inferior Haskell Mode

Naming

The name haskell-mode refers to the whole collection of modules in this package. There is specifically a file haskell-mode.el which defines a major mode called haskell-mode. Generally, in this documentation they will be distinguished by normal font (haskell-mode) and code font (haskell-mode).

History

haskell-mode has a long history. It goes all the way back to 1992. Since then, it has received many contributions in many forms. Some design choices that remain in haskell-mode today are historical. Some modules are outdated or no longer used, or are used by a few people.

Historically there hasn't been a single individual or set of individuals directing the package's architecture for a long period of time, rather, patches and new modules were accepted in liberally and we are left with a box full of interesting toys that may or may not work.