feat: add single file mode (#1385)

* This adds a "single file mode" option for each language server
* Currently, if a root is not detected, a new language server is started
  for each file opened.
* Root directory is set to `nil` in start_client. Some servers will
  refuse to start, or otherwise panic. This is opt-in per server.
* Some servers, such as rust-analyzer, explicitly have a "single file
  mode", we will not support that until it is officially part of the LSP
  specification

Co-authored-by: Peter Lithammer <peter.lithammer@gmail.com>

1 files changed, 11 insertions, 11 deletions

diff --git a/lua/lspconfig/pyright.lua b/lua/lspconfig/pyright.lua
index f9fe56d6..d17aac5e 100644
--- a/lua/lspconfig/pyright.lua
+++ b/lua/lspconfig/pyright.lua
@@ -7,6 +7,15 @@ if vim.fn.has 'win32' == 1 then
   bin_name = bin_name .. '.cmd'
 end
 
+local root_files = {
+  'pyproject.toml',
+  'setup.py',
+  'setup.cfg',
+  'requirements.txt',
+  'Pipfile',
+  'pyrightconfig.json',
+}
+
 local function organize_imports()
   local params = {
     command = 'pyright.organizeimports',
@@ -19,17 +28,8 @@ configs[server_name] = {
   default_config = {
     cmd = { bin_name, '--stdio' },
     filetypes = { 'python' },
-    root_dir = function(fname)
-      local root_files = {
-        'pyproject.toml',
-        'setup.py',
-        'setup.cfg',
-        'requirements.txt',
-        'Pipfile',
-        'pyrightconfig.json',
-      }
-      return util.root_pattern(unpack(root_files))(fname) or util.find_git_ancestor(fname) or util.path.dirname(fname)
-    end,
+    root_dir = util.root_pattern(unpack(root_files)),
+    single_file_support = true,
     settings = {
       python = {
         analysis = {