我可以在 Powershell 中自定义“不被识别为 cmdlet 的名称”错误吗？

Question

假设我在命令行打错字：

whih foo

Powershell 返回：

whih : The term 'whih' is not recognized as the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ whih mocha
+ ~~~~
+ CategoryInfo          : ObjectNotFound: (whih:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException

长消息对脚本很有用，但对于交互式 shell 使用，我想用更短的东西来包装它，比如：

'whih' isn't a cmdlet, function, script file, or operable program.

我可以包装错误并将其更改为更短的内容吗？

Answer 1

是的，你可以用a CommandNotFoundAction拦截CommandNotFoundException！

$ExecutionContext.InvokeCommand.CommandNotFoundAction = {
  param($Name,[System.Management.Automation.CommandLookupEventArgs]$CommandLookupArgs)  

  # Check if command was directly invoked by user
  # For a command invoked by a running script, CommandOrigin would be `Internal`
  if($CommandLookupArgs.CommandOrigin -eq 'Runspace'){
    # Assign a new action scriptblock, close over $Name from this scope 
    $CommandLookupArgs.CommandScriptBlock = {
      Write-Warning "'$Name' isn't a cmdlet, function, script file, or operable program."
    }.GetNewClosure()
  }
}