I wanted to replicate the following from kilo in Ruby:
if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0)I found the followin python (source):
import sys, struct, fcntl, termios
s = struct.pack('HHHH', 0, 0, 0, 0)
t = fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ, s)
print(struct.unpack('HHHH', t))But in Ruby there doesn't seem to be a default lib for termios, so we need the termios gem:
gem install termios
1 in the first example is for STDOUT as we can see in the python example, and
H in the Python pack call is for "unsigned short" (source), as opposed to
H in Ruby's pack which is for "hex string (high nibble first)" (source).
unsigned short in ruby is S_. So here we are:
irb(main):001:0> require 'termios'
=> true
irb(main):002:0> s = [0, 0, 0, 0].pack("S_S_S_S_")
=> "\x00\x00\x00\x00\x00\x00\x00\x00"
irb(main):003:0> STDOUT.ioctl(Termios::TIOCGWINSZ, s)
=> 0
irb(main):004:0> s.unpack("S_S_S_S_")
=> [67, 116, 1624, 2010]
irb(main):005:0>TADA! 🎉