Merge pull request #2378 from antew/feature/elm-lsp-linter

Elm: Support for elm-lsp

ale_linters/elm/elm_lsp.vim

@@ -0,0 +1,22 @@
+" Author: antew - https://github.com/antew
+" Description: LSP integration for elm, currently supports diagnostics (linting)
+
+call ale#Set('elm_lsp_executable', 'elm-lsp')
+call ale#Set('elm_lsp_use_global', get(g:, 'ale_use_global_executables', 0))
+
+function! elm_lsp#GetRootDir(buffer) abort
+    let l:elm_json = ale#path#FindNearestFile(a:buffer, 'elm.json')
+
+    return !empty(l:elm_json) ? fnamemodify(l:elm_json, ':p:h') : ''
+endfunction
+
+call ale#linter#Define('elm', {
+\   'name': 'elm_lsp',
+\   'lsp': 'stdio',
+\   'executable': {b -> ale#node#FindExecutable(b, 'elm_lsp', [
+\       'node_modules/.bin/elm-lsp',
+\   ])},
+\   'command': '%e --stdio',
+\   'project_root': function('elm_lsp#GetRootDir'),
+\   'language': 'elm'
+\})