feat(efm): re-enable single file support

1 files changed, 12 insertions, 3 deletions

diff --git a/lua/lspconfig/server_configurations/efm.lua b/lua/lspconfig/server_configurations/efm.lua
index 2944079b..ad4372ca 100644
--- a/lua/lspconfig/server_configurations/efm.lua
+++ b/lua/lspconfig/server_configurations/efm.lua
@@ -4,9 +4,7 @@ return {
   default_config = {
     cmd = { 'efm-langserver' },
     root_dir = util.find_git_ancestor,
-    -- EFM does not support NULL root directories
-    -- https://github.com/neovim/nvim-lspconfig/issues/1412
-    single_file_support = false,
+    single_file_support = true,
   },
 
   docs = {
@@ -15,6 +13,17 @@ https://github.com/mattn/efm-langserver
 
 General purpose Language Server that can use specified error message format generated from specified command.
 
+Requires at minimum EFM version [v0.0.38](https://github.com/mattn/efm-langserver/releases/tag/v0.0.38) to support
+launching the language server on single files. If on an older version of EFM, disable single file support:
+    
+```lua
+require('lspconfig')['efm'].setup{
+  settings = ..., -- You must populate this according to the EFM readme
+  filetypes = ..., -- Populate this according to the note below
+  single_file_support = false, -- This is the important line for supporting older version of EFM
+}
+```
+    
 Note: In order for neovim's built-in language server client to send the appropriate `languageId` to EFM, **you must
 specify `filetypes` in your call to `setup{}`**. Otherwise `lspconfig` will launch EFM on the `BufEnter` instead
 of the `FileType` autocommand, and the `filetype` variable used to populate the `languageId` will not yet be set.