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',
+\})

doc/ale-reasonml.txt

@@ -33,6 +33,22 @@ g:ale_reason_ols_use_global                       *g:ale_reason_ols_use_global*
   This variable can be set to `1` to always use the globally installed
   executable. See also |ale-integrations-local-executables|.
 
+===============================================================================
+reason-language-server                           *ale-reasonml-language-server*
+
+  Note: You *must* set an executable - there is no 'default' install location.
+  Go to https://github.com/jaredly/reason-language-server and download the
+  latest release. You can place it anywhere, but ensure you set the executable
+  path.
+
+g:ale_reason_ls_executable                        *g:ale_reason_ls_executable*
+                                                  *b:ale_reason_ls_executable*
+  Type: |String|
+
+  This variable defines the standard location of the language server
+  executable. This *must* be set.
+
+
 ===============================================================================
 refmt                                                      *ale-reasonml-refmt*