Elm plugin for Vim
Vim script
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mdxprograms Merge pull request #157 from jesse-c/cleanup-commands
Cleanup commands on plugin unload
Latest commit e51e2e4 Jun 18, 2018





  1. Syntax highlighting
  2. Automatic indentation
  3. Function completion
  4. Build and package commands
  5. Code formatting and linting
  6. Documentation lookup
  7. REPL integration

Check out this ElmCast video for more detail.


If you don't have a preferred installation method, I recommend installing vim-plug, and then simply add Plug 'elmcast/elm-vim' to your plugin section:

NOTE: If you are using vim-polyglot, you need to disable its default elm plugin by adding let g:polyglot_disabled = ['elm'] to your config file.


First, make sure you have the Elm Platform installed. The simplest method to get started is to use the official npm package.

npm install -g elm

In order to run unit tests from within vim, install elm-test

npm install -g elm-test

For code completion and doc lookups, install elm-oracle.

npm install -g elm-oracle

To automatically format your code, install elm-format.

npm install -g elm-format


The plugin provides several <Plug> mappings which can be used to create custom mappings. The following keybindings are provided by default:

Keybinding Description
<Leader>m Compile the current buffer.
<Leader>b Compile the Main.elm file in the project.
<Leader>t Runs the tests of the current buffer or 'tests/TestRunner'.
<Leader>r Opens an elm repl in a subprocess.
<Leader>e Shows the detail of the current error or warning.
<Leader>d Shows the type and docs for the word under the cursor.
<Leader>w Opens the docs web page for the word under the cursor.

You can disable these mappings if you want to use your own.

let g:elm_setup_keybindings = 0



The preferred linter to use with elm-vim is Ale. It should work out of the box.


Syntastic support should work out of the box, but we recommend the following settings:

let g:syntastic_always_populate_loc_list = 1
let g:syntastic_auto_loc_list = 1

let g:elm_syntastic_show_warnings = 1


let g:ycm_semantic_triggers = {
     \ 'elm' : ['.'],


call neocomplete#util#set_default_dictionary(
  \ 'g:neocomplete#sources#omni#input_patterns',
  \ 'elm',
  \ '\.')


:help elm-vim
let g:elm_jump_to_error = 0
let g:elm_make_output_file = "elm.js"
let g:elm_make_show_warnings = 0
let g:elm_syntastic_show_warnings = 0
let g:elm_browser_command = ""
let g:elm_detailed_complete = 0
let g:elm_format_autosave = 1
let g:elm_format_fail_silently = 0
let g:elm_setup_keybindings = 1
  • :ElmMake [filename] calls elm-make with the given file. If no file is given it uses the current file being edited.

  • :ElmMakeMain attempts to call elm-make with "Main.elm".

  • :ElmTest calls elm-test with the given file. If no file is given it runs it in the root of your project.

  • :ElmRepl runs elm-repl, which will return to vim on exiting.

  • :ElmErrorDetail shows the detail of the current error in the quickfix window.

  • :ElmShowDocs queries elm-oracle, then echoes the type and docs for the word under the cursor.

  • :ElmBrowseDocs queries elm-oracle, then opens docs web page for the word under the cursor.

  • :ElmFormat formats the current buffer with elm-format.


errors and completion


  • Other vim-plugins, thanks for inspiration (elm.vim, ocaml.vim, haskell-vim)
  • Contributors of elm-vim


Copyright © Joseph Hager. See LICENSE for more details.