输出到控制台，同时在ruby中保留用户输入 [英] Output to console while preserving user input in ruby

问题描述

我有一个ruby脚本，同步和异步接收和显示来自服务器的消息，并允许用户在控制台上输入。当接收到消息时，它当前正在写入用户正在键入的中间。输入本身不是乱码，但它看起来可怕。理想情况下，它将保存用户当前输入，输出消息，然后在下一行恢复输入。我在c通过拦截每一个关键笔划，但我记得的是，这是一个主要的麻烦。我对ruby很新，所以我不知道是否有一个很好的方法来做到这一点，或如何做。

示例：用户正在输入> abcde ，并且出现消息 hello ，用户类型 fgh after。控制台现在会显示：

 > abcdehellofgh 
  

，用户可以在最后继续输入。我想显示：

  hello 
> abcdefgh 
  
 p> 
 
解决方案
我的建议的两个重要部分是：
 
 1. system raw -echo）＃立即获得任何键入的字符与
 
的组合2.使用STDIN.getc和一个字符串var作为输入缓冲区重新打印用户输入。
 
 
 
按9（&布尔变量incoming_message）用于服务器消息的超简单模拟。
 
（更逼真会使示例膨胀， ，因为你必须适应你的场景的想法。）
 
 
 
按x退出。 
 
 
 
示例输出：
  $ ruby​​ simultaneous_input_and_output.rb 
 Hello World！9 
传入的消息是：true 
 Hello World！9x 
 
输入：
 Hello World！9x 
结束！ 
  
 
 
 
 
 
 
 
 
 ＃！/ usr / bin / ruby​​ 
 
 $ input_buffer =; 
 incoming_message = false 
 
 begin 
系统（stty raw -echo）
 
 begin 
 str = STDIN.getc 
 print str.chr 
 
 $ input_buffer = $ input_buffer + str.chr 
如果str.chr =='9'
 incoming_message = true 
 end 
如果incoming_message 
输入\\\
传入的消息是：+ incoming_message.to_s 
 print $ input_buffer 
 incoming_message = false 
 end 
 end while（str.chr ！='x'）
确保
系统（stty -raw echo）
 end 
 
输入\\\
\\\
You entered：
 puts $ input_buffer 
输入End！ 
  
 
 
 
 
 
 
 PS：
 stty raw -echo）see（User Jay）
 如何获得单个字符，而不按Enter键？ 
 
I have a ruby script that is simultaneously and asynchronously receiving and displaying messages from a server, and allowing user input on the console. When a message is received, it is currently being written in the middle of what the user is typing. The input itself isn't garbled, but it looks horrible. Ideally, it would save the users current input, output the message, and then restore the input on the next line. I've done this in c by intercepting every key stroke, but all I remember is that it was a major hassle. I'm fairly new to ruby, so I'm not sure if there is a good way to do this, or how to do it.

Example: User is typing >abcde, and message hello comes in, and user types fgh after. The console would now show:
>abcdehellofgh
and user can continue typing at the end. I would like it to show:
hello
>abcdefgh

解决方案
The two important parts of my proposal are:

1. system("stty raw -echo")  # to instantly get any typed character in combination with

2. using STDIN.getc with a string-var serving as an input-buffer to reprint the user input.

Pressing 9 (& boolean variable incoming_message) is used for ultra-simple simulation for your server-messages.

(Being more realistic would bloat the example without adding much, since you have to adapt the idea for your scenario anyway.)  

Press x for exit.  

Sample output:
$ ruby simultaneous_input_and_output.rb
Hello World!9
The incoming message is: true
Hello World!9x

You entered:
Hello World!9x
End!

  



#!/usr/bin/ruby

$input_buffer = "";  
incoming_message = false

begin  
  system("stty raw -echo")  

  begin   
    str = STDIN.getc  
    print str.chr  

    $input_buffer = $input_buffer + str.chr  
    if str.chr == '9'  
      incoming_message = true  
    end  
    if incoming_message   
      puts "\nThe incoming message is: " + incoming_message.to_s  
      print $input_buffer  
      incoming_message = false  
    end  
  end while (str.chr != 'x')  
ensure  
  system("stty -raw echo")  
end  

puts "\n\nYou entered:"   
puts $input_buffer  
puts "End!"    




P.S.:
for system("stty raw -echo") see (User Jay)
How to get a single character without pressing enter?

                        
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