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generate-alt-random: don’t run TIOCGWINSZ ioctl if --cols and --rows were used

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Daniel Eklöf 2021-04-22 11:20:55 +02:00
parent 10e512f14f
commit a9236129f6
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1 changed files with 25 additions and 24 deletions
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49
scripts/generate-alt-random-writes.py
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@ -38,35 +38,36 @@ def main():
opts = parser.parse_args() opts = parser.parse_args()
out = opts.out if opts.out is not None else sys.stdout out = opts.out if opts.out is not None else sys.stdout
try: if opts.rows is None or opts.cols is None:
def dummy(*args): try:
"""Need a handler installed for sigwait() to trigger.""" def dummy(*args):
pass """Need a handler installed for sigwait() to trigger."""
signal.signal(signal.SIGWINCH, dummy) pass
signal.signal(signal.SIGWINCH, dummy)
while True: while True:
with open('/dev/tty', 'rb') as pty: with open('/dev/tty', 'rb') as pty:
lines, cols, height, width = struct.unpack( lines, cols, height, width = struct.unpack(
'HHHH', 'HHHH',
fcntl.ioctl(pty, fcntl.ioctl(pty,
termios.TIOCGWINSZ, termios.TIOCGWINSZ,
struct.pack('HHHH', 0, 0, 0, 0))) struct.pack('HHHH', 0, 0, 0, 0)))
if width > 0 and height > 0: if width > 0 and height > 0:
break break
# We’re early; the foot window hasn’t been mapped yet. Or, # We’re early; the foot window hasn’t been mapped yet. Or,
# to be more precise, fonts haven’t yet been loaded, # to be more precise, fonts haven’t yet been loaded,
# meaning it doesn’t have any cell geometry yet. # meaning it doesn’t have any cell geometry yet.
signal.sigwait([signal.SIGWINCH]) signal.sigwait([signal.SIGWINCH])
signal.signal(signal.SIGWINCH, signal.SIG_DFL) signal.signal(signal.SIGWINCH, signal.SIG_DFL)
except OSError: except OSError:
lines = None lines = None
cols = None cols = None
height = None height = None
width = None width = None
if opts.rows is not None: if opts.rows is not None:
lines = opts.rows lines = opts.rows