feat: add :LspRestart command

lua/core/lsp.lua

···
   "yamlls",
 }
 
+vim.api.nvim_create_user_command("LspRestart", function(opts)
+  vim.lsp.enable(opts.args, false)
+  vim.lsp.enable(opts.args, true)
+end, { nargs = 1, complete = u.lsp.get_clients })
+
 u.aucmd("LspAttach", {
   group = u.augroup "lsp",
   callback = function(args)

lua/core/utils.lua

···
         vim.lsp.buf.execute_command(command)
       end, {})
     end,
+
+    ---get list of lsp servers connected to current buffer
+    ---@return string[]
+    get_clients = function()
+      return vim
+        .iter(vim.lsp.get_clients { bufnr = 0 })
+        :map(function(e)
+          return (e.name ~= "null-ls" and e.name) or nil
+        end)
+        :totable()
+    end,
   },
 }

lua/plugins/lualine.lua

···
+local u = require "core.utils"
 local c = {
   mode = {
     function()
···
   location = { "location", padding = 1, colored = false },
   lsp = {
     function()
-      local clients = vim.lsp.get_clients { bufnr = 0 }
-      local client_names = {}
-      for _, client in pairs(clients) do
-        if client.name ~= "null-ls" then
-          table.insert(client_names, client.name)
-        end
-      end
-
-      local client_names_str = table.concat(client_names, ", ")
-      if #client_names_str == 0 then
-        return ""
-      else
-        return "[" .. client_names_str .. "]"
-      end
+      local clients = table.concat(u.lsp.get_clients(), ", ")
+      return (#clients == 0 and "") or ("[" .. clients .. "]")
     end,
   },
 }