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Add Input option to disable terminal start/stop #116

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Merged
merged 1 commit into from
Mar 8, 2018
Merged

Add Input option to disable terminal start/stop #116

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13 changes: 12 additions & 1 deletion curtsies/input.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,8 @@ class Input(object):
"""Keypress and control event generator"""
def __init__(self, in_stream=None, keynames='curtsies',
paste_threshold=events.MAX_KEYPRESS_SIZE+1, sigint_event=False,
signint_callback_provider=None):
signint_callback_provider=None,
disable_terminal_start_stop=False):
"""Returns an Input instance.

Args:
Expand All @@ -56,6 +57,9 @@ def __init__(self, in_stream=None, keynames='curtsies',
represent to be combined into a single paste event
sigint_event (bool): Whether SIGINT signals from the OS
should be intercepted and returned as SigIntEvent objects
disable_terminal_start_stop (bool): If True, disable terminal
start/stop using Ctrl-s/Ctrl-q, thus enabling these keys
to be read as input by curtsies
"""
if in_stream is None:
in_stream = sys.__stdin__
Expand All @@ -64,6 +68,7 @@ def __init__(self, in_stream=None, keynames='curtsies',
self.keynames = keynames
self.paste_threshold = paste_threshold
self.sigint_event = sigint_event
self.disable_terminal_start_stop = disable_terminal_start_stop
self.sigints = []

self.readers = []
Expand All @@ -79,6 +84,12 @@ def __enter__(self):
self.original_stty = termios.tcgetattr(self.in_stream)
tty.setcbreak(self.in_stream, termios.TCSANOW)

if self.disable_terminal_start_stop:
attrs = termios.tcgetattr(self.in_stream)
attrs[-1][termios.VSTOP] = 0 # Ctrl-s
attrs[-1][termios.VSTART] = 0 # Ctrl-q
termios.tcsetattr(self.in_stream, termios.TCSANOW, attrs)

if sys.platform == 'darwin':
attrs = termios.tcgetattr(self.in_stream)
VDSUSP = termios.VSUSP + 1
Expand Down
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