Question

我有一个函数调用confirm来获取用户输入，执行操作，然后向用户输出消息：

function! PerformAction()
  let answer = confirm('Do thing?', "&Yes\n&No", 1)
  if answer == 1
    call system("do_thing")
    echo "Did thing!"
  endif
endfunction

我遇到的问题是，这最终会导致用户在执行命令后再次点击[Enter]，因为命令行已扩展为显示提示和消息。

是否可以防止这种情况，以便在用户输入提示值后，清除命令行，执行call system，然后打印显示"Did thing!"的单行。命令行，允许用户立即继续工作？

Answer 1

如果您告诉vim使用:redraw刷新屏幕，则会解决您的问题：

function! PerformAction()
  let answer = confirm('Do thing?', "&Yes\n&No", 1)
  if answer == 1
    call system("do_thing")
    redraw
    echo "Did thing!"
  endif
endfunction

我不确切知道为什么会这样，但:redraw的帮助页面中提及了echo：

                            *:echo-redraw*
            A later redraw may make the message disappear again.
            And since Vim mostly postpones redrawing until it's
            finished with a sequence of commands this happens
            quite often.  To avoid that a command from before the
            ":echo" causes a redraw afterwards (redraws are often
            postponed until you type something), force a redraw
            with the |:redraw| command.  Example: >
        :new | redraw | echo "there is a new window"

vimscript：`confirm`后清除命令行

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