Add ElmLS (#9)

- Initial add of elmLS support
- Removes unnecessary vim.schedule_wrap fn calls in elmls & clangd impls
- Add automatic installation for elmls and update docs.
- Sort server output in the README.
- Add commands for elmls for buffer and globally.
- [bugfix] Skeleton could've tried to attach even if root_dir was nil

TODO: check for updates and warn the user if there are updates when an elm server is started.


Co-authored-by: Seth Messer <seth.messer@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/lua/nvim_lsp/util.lua b/lua/nvim_lsp/util.lua
index 190869e6..2b13d227 100644
--- a/lua/nvim_lsp/util.lua
+++ b/lua/nvim_lsp/util.lua
@@ -2,6 +2,7 @@ local validate = vim.validate
 local api = vim.api
 local lsp = vim.lsp
 local uv = vim.loop
+local fn = vim.fn
 
 local M = {}
 
@@ -89,6 +90,15 @@ function M.create_module_commands(module_name, commands)
   end
 end
 
+function M.need_bins(...)
+  for i = 1, select("#", ...) do
+    if 0 == fn.executable((select(i, ...))) then
+      return false
+    end
+  end
+  return true
+end
+
 -- Some path utilities
 M.path = (function()
   local function exists(filename)