neat little lsp rename function

lsp_rename.lua

  function LspRename()
    local curr_name = vim.fn.expand("<cword>")
    local value = vim.fn.input("LSP Rename: ", curr_name)
    local lsp_params = vim.lsp.util.make_position_params()

    if not value or #value == 0 or curr_name == value then return end

    -- request lsp rename
    lsp_params.newName = value
    vim.lsp.buf_request(0, "textDocument/rename", lsp_params, function(_, res, ctx, _)
      if not res then return end

      -- apply renames
      local client = vim.lsp.get_client_by_id(ctx.client_id)
      vim.lsp.util.apply_workspace_edit(res, client.offset_encoding)

      -- print renames
      local changed_files_count = 0
      local changed_instances_count = 0
      
      if (res.documentChanges) then
        for _, changed_file in pairs(res.documentChanges) do
          changed_files_count = changed_files_count + 1
          changed_instances_count = changed_instances_count + #changed_file.edits
        end
      elseif (res.changes) then
        for _, changed_file in pairs(res.changes) do
          changed_instances_count = changed_instances_count + #changed_file
          changed_files_count = changed_files_count + 1
        end
      end
      
      -- compose the right print message
      print(string.format("renamed %s instance%s in %s file%s. %s", 
        changed_instances_count,
        changed_instances_count == 1 and '' or 's',
        changed_files_count,
        changed_files_count == 1 and '' or 's',
        changed_files_count > 1 and "To save them run ':wa'" or ''
      ))
    end)