Add pyright languageserver

lua/nvim_lsp/pyright.lua

@@ -0,0 +1,40 @@
+local configs = require 'lspconfig/configs'
+local util = require 'lspconfig/util'
+
+local server_name = "pyright"
+
+local installer = util.npm_installer {
+  server_name = server_name;
+  packages = {server_name};
+  binaries = {server_name};
+}
+
+configs[server_name] = {
+  default_config = {
+    cmd = {"pyright-langserver", "--stdio"};
+    filetypes = {"python"};
+    root_dir = util.root_pattern(".git", "setup.py",  "setup.cfg", "pyproject.toml", "requirements.txt");
+    settings = {
+      analysis = { autoSearchPaths= true; };
+      pyright = { useLibraryCodeForTypes = true; };
+    };
+    -- The following before_init function can be removed once https://github.com/neovim/neovim/pull/12638 is merged
+    before_init = function(initialize_params)
+            initialize_params['workspaceFolders'] = {{
+                name = 'workspace',
+                uri = initialize_params['rootUri']
+            }}
+    end
+   };
+  docs = {
+    description = [[
+https://github.com/microsoft/pyright
+
+`pyright`, a static type checker and language server for python
+]];
+  };
+}
+
+configs[server_name].install = installer.install
+configs[server_name].install_info = installer.info
+-- vim:et ts=2 sw=2