nvim: Add experimental nushell lsp and treesitter

HACK
Added support for nushell lsp (not yet available to automatically install
through mason integration) and for nushell treesitter (VERY manual
installation as of right now).

Will work for testing out the shell and its nvim integration but
definitely has to be integrated better in the future.

nvim/.config/nvim/lua/plugins/config/lsp.lua

@@ -137,6 +137,7 @@ lsp.setup({
 })
 
 local lspconfig = require("lspconfig")
+lspconfig.nushell.setup({})
 
 local python_path
 -- ensure python virtualenv is determined automatically on lsp start

nvim/.config/nvim/lua/plugins/treesitter.lua

@@ -39,6 +39,20 @@ return {
 				enable = true,
 				enable_autocmd = false, -- since we run it as a hook from the mini.comment plugin
 			})
+
+			-- treesitter parser for nushell. To fully get e.g. syntax highlight
+			-- working you need a highlight file too. For now I installed manually, see:
+			-- https://github.com/nushell/tree-sitter-nu/blob/main/installation/neovim.md
+			local parser_config = require("nvim-treesitter.parsers").get_parser_configs()
+			parser_config.nu = {
+				install_info = {
+					url = "https://github.com/nushell/tree-sitter-nu",
+					files = { "src/parser.c" },
+					branch = "main",
+				},
+				filetype = "nu",
+			}
+
 		end,
 		event = "BufReadPost",
 		cmd = {