CODEWITHSUNDEEP
rubymultithreadingconcurrency
alv_721
alv_721

Reputation: 325

Ruby - how to make multiple progress bars in the terminal

I am trying to implement a threads race in Ruby which should show each Thread progress in the terminal (kind of real-time). I got blocked with the point where I need to move to the previous terminal lines.

I use this solution atm:

bar, bar2 = '', ''
  50.times do |i|
  bar << '='
  bar2 << '**'
  puts  "#{bar} - #{i+1}0%"
  print "#{bar2} - #{i+1}0%"
  print "\033[F\r"
  sleep 0.3
end

still it is working only for 2 bars, and I have no idea how I can scale with some more threads.

Upvotes: 2

Views: 536

Answers (1)

Aleksei Matiushkin
Aleksei Matiushkin

Reputation: 121020

One should extensively use escape sequences for cursor movement:

BARS_COUNT = 3 
SYMBOLS = %w|= ** ℹℹℹ|
BARS = ['', '', ''] 

BARS_COUNT.times { puts } # prepare the space

20.times do |i| 
  print "\033[#{BARS_COUNT}A"
  BARS_COUNT.times do |pos|
    BARS[pos] << SYMBOLS[pos]
    puts "\033[#{i * SYMBOLS[pos].length}C#{SYMBOLS[pos]}"
  end 
  sleep 0.1 
end

For more sophisticated positioning use \033[<L>;<C>f as described in the reference I linked.

Upvotes: 4

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