fix: only attempt to attach to valid bufnames (#1598)

* Check that a bufname begins with a filesystem root specifier such as a drive letter (Windows) or "/" (Unix)
* Unify with check that buf name is not "" or nil

1 files changed, 8 insertions, 0 deletions

diff --git a/lua/lspconfig/util.lua b/lua/lspconfig/util.lua
index 05d844ae..11586d50 100644
--- a/lua/lspconfig/util.lua
+++ b/lua/lspconfig/util.lua
@@ -19,6 +19,14 @@ M.default_config = {
 -- global on_setup hook
 M.on_setup = nil
 
+function M.bufname_valid(bufname)
+  if bufname and bufname ~= '' and (bufname:match '^([a-zA-Z]:).*' or bufname:match '^/') then
+    return true
+  else
+    return false
+  end
+end
+
 function M.validate_bufnr(bufnr)
   validate {
     bufnr = { bufnr, 'n' },