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A Sublime Text 3 plugin for Haskell. Features cabal building, error and warning highlighting, smart completion and ghc-mod integration.

Labels haskell



  • Total 54K
  • Win 20K
  • Mac 19K
  • Linux 15K
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Quick link ==> SublimeHaskell's Documentation


Required (Before You Install SublimeHaskell)

You will need to install either the GHC Haskell compiler and cabal either stack build tool and a backend before you install SublimeHaskell.

  • stack will install ghc automatically, so there's no need to install GHC independently:
  • or you may install Haskell Platform (includes cabal build tool):
    • The Glorious Haskell Computer (ghc). Preferably, you should install the Haskell Platform if you don't already have a Haskell development and hacking environment set up.
    • cabal. Under normal circumstances, cabal should come pre-installed with your Haskell environment, e.g., if you installed the Haskell Platform.
  • A backend. SublimeHaskell communicates with the backend to support the interesting editing features. The preferred backend is hsdev. You can use one of the deprecated backends, but know that support for these backends may be dropped or removed in a future SublimeHaskell release.

    • hsdev cabal package for inspection, enhanced completion, goto, symbol info etc.

      • with cabalcabal install hsdev
      • with stack — create config (for example, hsdev.yaml) with contents:
      packages: []
      resolver: lts-13.29
      - hsdev-
      - haddock-api-2.21.0
      - hdocs-
      - network-

      And then run stack install hsdev --stack-yaml hsdev.yaml

    • Deprecated backends

    • ghc-mod (for import and LANGUAGE completions and type inference, cabal install ghc-mod, not used if hsdev enabled, ghc-mod is used by hsdev as a library)

Install SublimeHaskell

  1. Get Sublime Text: http://www.sublimetext.com/
  2. Install the Sublime Package Control package: http://wbond.net/sublime_packages/package_control/installation
  3. Use Package Control to install SublimeHaskell

Open a Haskell source file, cabal builder file or a stack.yaml builder and have a productive Haskell development session!

Optional Tools

  • stack. The Haskell Tool Stack. If you installed the Haskell Platform, you already have this installed. stack is a companion Haskell build tool that supplements cabal.
  • SublimeREPL package for REPL support, if you want to interact with GHCI from within SublimeText.
  • Code prettifier:

Tool Installation Location

Tools (cabal, hsdev, ghc-mod, ghc, etc.) are usually installed in a directory that is already added to your PATH environment variable. SublimeHaskell will also look for these tools in several “Haskell standard” places. These places include:

Builder *nix Platforms Windows
stack $HOME/.local/bin %APPDATA%/local/bin
cabal user $HOME/.cabal/bin %APPDATA/cabal/bin
cabal global /usr/local/bin %PROGRAMFILES%/Haskell/bin

More advanced users can configure cabal's user and global install paths in $HOME/.cabal/config. SublimeHaskell will use these values if configured and if the directories to which they refer exist.

If you have a non-standard installation location for your tools, you can configure this in SublimeHaskell's “User Settings” by adjusting add_to_PATH. You will have to restart SublimeText after you save your preferences.

SublimeHaskell Theme

There is a special theme with enhanced Haskell entities and marks (errors, warnings and hints) coloring. Note different coloring for types and constructors (in import list, data declaration etc.), special coloring of generic variables in types, pragmas and module imports



  • Open the SublimeText Command Palette ( Ctrl-Shift-P or Option-Command-P on OS X) and type haskell to explore SublimeHaskell's goodness.

  • When editing Haskell source files, automatic error highlighting and enhanced auto-completion is available.

  • Each time you save, any errors in your program will be listed at the bottom of the window and highlighted in the source code.

  • All source files in the project are scanned on change. Any symbols that they export are provided in the auto-complete suggestions.

  • Stylish-haskell can be used to stylish file or selected text.

  • Use F12 to go to declaration and ctrl+k ctrl+i to show symbol info with documentation. These commands are also available through context menu with right-click.

  • To show inferred types use Show type (ctrl-k ctrl-h ctrl-t) command.

  • To insert inferred type use Insert type (ctrl-k ctrl-h ctrl-i).

  • You can jump between the errors and warnings with alt+d alt+e and alt+shift+d alt+shift+e.

  • To show hidden error output, use command Show error panel (ctrl-alt-e)

Features and SublimeHaskell Goodness

Stack support

Build commands such as Build, Clean, Install, Rebuild uses stack if there is stack.yaml near .cabal. If you don't want to use stack, set haskell_build_tool setting to cabal.

hsdev uses stack to build dependencies and to get corresponding package-dbs. Since it passes --compiler and --arch options to stack to get package-dbs built with hsdev-compatible compiler.

Enhanced completion

Works in export list (showing symbols in scope), import list, expressions. Completes after module qualifier (several modules can be import qualified as with same qualifier). Takes into account module reexports for sources. Autocompletion


  • Show popup with symbol info and with error/warning/hint details. Requires SublimeText 3 dev build > 3116 (https://forum.sublimetext.com/t/dev-build-3116/21148). Hover

  • It also shows inferred type when possible HoverTypes

  • You can select all usages of symbol via link HoverUsages

  • And you can autofix warnings/hints on popup for warnings/hints AutoFixHover


  • SublimeHaskell: Insert import for symbol — add import for declaration InsertImport
  • SublimeHaskell: Find declarations — find declarations in installed packages and in projects
  • SublimeHaskell: Search declarations everywhere — search declarations in hayoo too
  • SublimeHaskell: Browse module — get declarations for module BrowseModule
  • SublimeHaskell: Browse declarations — get declarations in scope of current file
  • SublimeHaskell: Show symbol info — get help for symbol, ctrl+k ctrl+i
  • SublimeHaskell: Toggle symbol info panel — toggle continuout symbol info panel, which show info about symbol under cursor. Useful when reading code. SymbolInfo
  • SublimeHaskell: Go to module — go to module, ctrl+k ctrl+p GoToModule
  • SublimeHaskell: Go to declaration — overrides default, f12
  • Ctrl+R, Ctrl+Shift+R — overrides default, goto symbol and goto symbol in project
  • SublimeHaskell: Show type — show type/types for current expression, ctrl-k ctrl-h ctrl-t
  • SublimeHaskell: Expand selection to Expression — expand selection to expression, ctrl+shift+y
  • SublimeHaskell: Show/hide all types — get all types and highlight while selection modifies, ctrl+t, h Types
  • SublimeHaskell: Insert type — insert type for selected expression, ctrl-k ctrl-h ctrl-i
  • SublimeHaskell: Hayoo — search in hayoo
  • SublimeHaskell: Auto fix — auto fix some of warnings and/or errors (for now redundant imports and hlint hints) AutoFix
  • SublimeHaskell: Stylish — stylish source with stylish-haskell
  • SublimeHaskell: Scan docs and infer types — as long as scanning docs for sources and inferring types is long process, it's disabled by default, but this command can be used to scan docs and infer types for currently opened view
  • SublimeHaskell: Check & Lint — check/lint/check & lint opened file. Enable option check_lint_fly to check & lint on idle, rescanning actual source, so that completions are updated
  • SublimeHaskell: Eval expression — evaluate expression in context of current module
  • SublimeHaskell: Expression type — evaluate expression type in context of current module
  • Eval commands — see animation
    • SublimeHaskell: Eval selection — eval selected expression, for example
    • [1..10][1,2,3,4,5,6,7,8,9,10]
    • replicate 10 'a'aaaaaaaaaa (note no double quotes for string result)
    • SublimeHaskell: Apply to selection — same as above, but applies function to each selection
    • foobarreverseraboof
    • [1..10]reverse[10,9,8,7,6,5,4,3,2,1]
    • 1, 2, 3succ2, 3, 4
    • [1..3]intercalate ", " . map (\i -> "foo" ++ show i)foo1, foo2, foo3
    • SublimeHaskell: Apply to selection list — applies function to list made from selections
    • foo, bar, bazreversebaz, bar, foo
    • foo, bar, bazsortbar, baz, foo
  • Repl commands (uses SublimeREPL package)
    • SublimeHaskell Repl: GHCi — runs ghci
    • SublimeHaskell Repl: GHCi current file — runs ghci and loads current file
    • SublimeHaskell Repl: Cabal Repl — runs cabal repl for current project
    • SublimeHaskell Repl: Load — loads current file or project in repl
  • Context menu commands
    • Open package on Hackage — works within symbol info panel, opens Hackage page
    • Open module on Hackage — words in symbol info panel and in sources, opens Hackage page for selected module
    • Show symbol usages — show list of locations where symbol is used
  • Build commands
    • Build, Typecheck build (no codegen), Clean, Configure, Rebuild, Install, Test, Run
  • Error commands:
    • SublimeHaskell: Go to next error — go to next error in file, alt+d alt+e
    • SublimeHaskell: Go to previous error — go to previous error in file, alt+shift+d alt+shift+e
    • SublimeHaskell: Show error panel — show error panel if it was hidden, ctrl+alt+e

Inside and outside your project: codex

codex allows you to use ctags to jump to definitions that are declared in your cabal dependencies.

  • cabal install codex
  • Run codex set format sublime, that updates your ~/.codex file to Sublime's Ctags plugin's format
  • Change ~/.codex to tagsFileName: .tags
  • In your project, codex cache clean && codex update
  • You can now jump to the source code of definitions outside of your project.
  • The commands CTags: Show Symbols and CTags: Rebuild Tags currently don't work with codex


Icons from FlatIcon.

Error icon by Eleonor Wang
Warning icon by Freepik
Hint icon by Gregor Cresnar
Wrench icon by Gregor Cresnar