Add support for reason-language-server

ale_linters/reason/reason_ls.vim

@@ -0,0 +1,21 @@
+" Author: David Buchan-Swanson <github@deecewan.com>
+" Description: Integrate ALE with reason-language-server.
+
+function! ale_linters#reason#reason_ls#FindProjectRoot(buffer) abort
+    let l:reason_config = ale#path#FindNearestFile(a:buffer, 'bsconfig.json')
+
+    if !empty(l:reason_config)
+        return fnamemodify(l:reason_config, ':h')
+    endif
+
+    return ''
+endfunction
+
+call ale#linter#Define('reason', {
+\   'name': 'reason-language-server',
+\   'lsp': 'stdio',
+\   'executable':{buffer -> ale#Var(buffer, 'reason_ls_executable')},
+\   'command': '%e',
+\   'project_root': function('ale_linters#reason#reason_ls#FindProjectRoot'),
+\   'language': 'reason',
+\})