A Sublime Text 3 plugin for Haskell. Features cabal building, error and warning highlighting, smart completion and ghc-mod integration.
Python Haskell
Latest commit 51a7450 May 2, 2017 B. Scott Michel Release 1.2.5
Relax environment variable handling in proc_helper.
Failed to load latest commit information.
Commands minor enhancements May 1, 2017
Completions Restructured a bit. Nov 20, 2013
Icons ERRORS storage rewritten, now can autofix by hovering hint Sep 24, 2016
Keymaps minor enhancements May 1, 2017
Menus Allow go to hackage from context menu on source file Jan 19, 2015
Messages proc_helper environment variable frobbing May 2, 2017
Settings more issue fixes Apr 28, 2017
Snippets Added OPTIONS_GHC snippet Oct 7, 2016
Syntaxes hindent, stack exec, capture failed stdout/stderr Mar 1, 2017
Themes Syntax fixes: Dec 11, 2016
hsdev lint and error navigation debugging May 1, 2017
internals proc_helper environment variable frobbing May 2, 2017
.gitignore more documentation twiddling. Apr 10, 2017
.hgignore Ignore Sublime files. Apr 5, 2012
.no-sublime-package Unzip this package Aug 25, 2013
.pylintrc minor enhancements May 1, 2017
LICENSE.txt Renamed the license file, which was inexplicably called README. Mar 3, 2012
Makefile Add Makefile with check target to be run before commits Jan 12, 2013
README.md Update README Mar 2, 2017
SubHaskEditing.md more documentation twiddling. Apr 10, 2017
SublimeHaskell.sublime-build minor enhancements May 1, 2017
__init__.py pylint, Unicode and settings fixes Mar 23, 2017
add_import.py add import -> own python module Apr 6, 2017
autobuild.py pylint code audit Apr 5, 2017
autocomplete.py updates from backend_refactor Apr 5, 2017
build.py minor enhancements May 1, 2017
cabal.py pylint code audit Apr 5, 2017
check_lint.py remove extra debugging May 2, 2017
commands.py Merge branch 'fixes_1.2.1' Apr 13, 2017
dead-code.py-xxx pylint code audit Apr 5, 2017
dependencies.json pylint code audit Apr 5, 2017
fix_syntax.py pylint code audit Apr 5, 2017
ghci_backend.py pylint code audit Apr 5, 2017
hdevtools.py pylint code audit Apr 5, 2017
indenters.py pylint code audit Apr 5, 2017
info_popup.py pylint code audit Apr 5, 2017
messages.json proc_helper environment variable frobbing May 2, 2017
parseoutput.py lint and error navigation debugging May 1, 2017
repl.py pylint code audit Apr 5, 2017
subhask.sublime-project proc_helper environment variable frobbing May 2, 2017
subhask.sublime-workspace pylint code audit Apr 5, 2017
sublime_haskell_common.py import module fixed, autocompletion debugging Apr 5, 2017
symbols.py pylint code audit Apr 5, 2017
types.py pylint code audit Apr 5, 2017
worker.py pylint code audit Apr 5, 2017
zzstartup.py r1.2.1: call agent.stop_hsdev(), not stop_hsdev() Apr 11, 2017



Package Control Join the chat at https://gitter.im/SublimeHaskell/SublimeHaskell PayPal Flattr this git repo


Quick link ==> SublimeHaskell's Documentation


Required (Before You Install SublimeHaskell)

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

  • 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 (cabal install hsdev) for inspection, enhanced completion, goto, symbol info etc.
    • 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)
      • hdevtools (or fork for windows) (for type inference, cabal install hdevtools, not used if hsdev enabled)

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

  • 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
  • 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
  • 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