在控制台中打印ASCII旋转“光标”

我有一个Ruby脚本，可以完成一些长期的工作。 它只是命令行，我想表明脚本仍在运行而不是停止。 我曾经喜欢过去所谓的“旋转光标”，我设法在Windows下用Ruby重现它。

问题：这在其他操作系统中有效吗？ 如果没有，是否有与操作系统无关的方法来实现这一目标？

请不要IRB解决方案。

10.times { print "/" sleep(0.1) print "\b" print "-" sleep(0.1) print "\b" print "\\" sleep(0.1) print "\b" print "|" sleep(0.1) print "\b" } 

Answer 1

是的，这适用于Windows，OS X和Linux。 改进尼克拉斯的建议，你可以这样更加通用：

 def show_wait_cursor(seconds,fps=10) chars = %w[| / - \\] delay = 1.0/fps (seconds*fps).round.times{ |i| print chars[i % chars.length] sleep delay print "\b" } end show_wait_cursor(3) 

如果您不知道该过程需要多长时间，您可以在另一个线程中执行此操作：

 def show_wait_spinner(fps=10) chars = %w[| / - \\] delay = 1.0/fps iter = 0 spinner = Thread.new do while iter do # Keep spinning until told otherwise print chars[(iter+=1) % chars.length] sleep delay print "\b" end end yield.tap{ # After yielding to the block, save the return value iter = false # Tell the thread to exit, cleaning up after itself… spinner.join # …and wait for it to do so. } # Use the block's return value as the method's end print "Doing something tricky..." show_wait_spinner{ sleep rand(4)+2 # Simulate a task taking an unknown amount of time } puts "Done!" 

这个输出：

 Doing something tricky...| Doing something tricky.../ Doing something tricky...- Doing something tricky...\ (et cetera) Doing something tricky...done! 

Answer 2

 # First define your chars pinwheel = %w{| / - \\} # Rotate and print as often as needed to "spin" def spin_it print "\b" + pinwheel.rotate!.first end 

来自彼得的编辑：这是一个工作版本

 def spin_it(times) pinwheel = %w{| / - \\} times.times do print "\b" + pinwheel.rotate!.first sleep(0.1) end end spin_it 10 

Answer 3

我写了一个gem spin_to_win ，它显示一个微调器，同时产生一个块。 例如：

 SpinToWin.with_spinner('Zzzz') do |spinner| spinner.banner('sleepy') sleep 1 end 

 Zzzz \ [sleepy] 

它还可以跟踪待完成的工作与完成的工作：

 SpinToWin.with_spinner('Zzzz') do |spinner| spinner.increment_todo!(3) spinner.banner('snore') sleep 1 spinner.increment_done! spinner.banner('dream') sleep 1 spinner.increment_done! spinner.banner('wake up!') sleep 1 spinner.increment_done! end 

 Zzzz \ 3 of 3 [wake up!]