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#!/usr/bin/env python
"""Display known information about our terminal."""
# pylint: disable=invalid-name
# Invalid module name "display-terminalinfo"
# std imports
import os
import sys
import locale
import platform
BITMAP_IFLAG = {
'IGNBRK': 'ignore BREAK condition',
'BRKINT': 'map BREAK to SIGINTR',
'IGNPAR': 'ignore (discard) parity errors',
'PARMRK': 'mark parity and framing errors',
'INPCK': 'enable checking of parity errors',
'ISTRIP': 'strip 8th bit off chars',
'INLCR': 'map NL into CR',
'IGNCR': 'ignore CR',
'ICRNL': 'map CR to NL (ala CRMOD)',
'IXON': 'enable output flow control',
'IXOFF': 'enable input flow control',
'IXANY': 'any char will restart after stop',
'IMAXBEL': 'ring bell on input queue full',
'IUCLC': 'translate upper case to lower case',
}
BITMAP_OFLAG = {
'OPOST': 'enable following output processing',
'ONLCR': 'map NL to CR-NL (ala CRMOD)',
'OXTABS': 'expand tabs to spaces',
'ONOEOT': 'discard EOT\'s `^D\' on output)',
'OCRNL': 'map CR to NL',
'OLCUC': 'translate lower case to upper case',
'ONOCR': 'No CR output at column 0',
'ONLRET': 'NL performs CR function',
}
BITMAP_CFLAG = {
'CSIZE': 'character size mask',
'CS5': '5 bits (pseudo)',
'CS6': '6 bits',
'CS7': '7 bits',
'CS8': '8 bits',
'CSTOPB': 'send 2 stop bits',
'CREAD': 'enable receiver',
'PARENB': 'parity enable',
'PARODD': 'odd parity, else even',
'HUPCL': 'hang up on last close',
'CLOCAL': 'ignore modem status lines',
'CCTS_OFLOW': 'CTS flow control of output',
'CRTSCTS': 'same as CCTS_OFLOW',
'CRTS_IFLOW': 'RTS flow control of input',
'MDMBUF': 'flow control output via Carrier',
}
BITMAP_LFLAG = {
'ECHOKE': 'visual erase for line kill',
'ECHOE': 'visually erase chars',
'ECHO': 'enable echoing',
'ECHONL': 'echo NL even if ECHO is off',
'ECHOPRT': 'visual erase mode for hardcopy',
'ECHOCTL': 'echo control chars as ^(Char)',
'ISIG': 'enable signals INTR, QUIT, [D]SUSP',
'ICANON': 'canonicalize input lines',
'ALTWERASE': 'use alternate WERASE algorithm',
'IEXTEN': 'enable DISCARD and LNEXT',
'EXTPROC': 'external processing',
'TOSTOP': 'stop background jobs from output',
'FLUSHO': 'output being flushed (state)',
'NOKERNINFO': 'no kernel output from VSTATUS',
'PENDIN': 'XXX retype pending input (state)',
'NOFLSH': 'don\'t flush after interrupt',
}
CTLCHAR_INDEX = {
'VEOF': 'EOF',
'VEOL': 'EOL',
'VEOL2': 'EOL2',
'VERASE': 'ERASE',
'VWERASE': 'WERASE',
'VKILL': 'KILL',
'VREPRINT': 'REPRINT',
'VINTR': 'INTR',
'VQUIT': 'QUIT',
'VSUSP': 'SUSP',
'VDSUSP': 'DSUSP',
'VSTART': 'START',
'VSTOP': 'STOP',
'VLNEXT': 'LNEXT',
'VDISCARD': 'DISCARD',
'VMIN': '---',
'VTIME': '---',
'VSTATUS': 'STATUS',
}
def display_bitmask(kind, bitmap, value):
"""Display all matching bitmask values for ``value`` given ``bitmap``."""
import termios
col1_width = max(map(len, list(bitmap.keys()) + [kind]))
col2_width = 7
fmt = '{name:>{col1_width}} {value:>{col2_width}} {description}'
print(fmt.format(name=kind,
value='Value',
description='Description',
col1_width=col1_width,
col2_width=col2_width))
print(f"{'-' * col1_width} {'-' * col2_width} "
f"{'-' * max(map(len, bitmap.values()))}")
for flag_name, description in bitmap.items():
try:
bitmask = getattr(termios, flag_name)
bit_val = 'on' if bool(value & bitmask) else 'off'
except AttributeError:
bit_val = 'undef'
print(fmt.format(name=flag_name,
value=bit_val,
description=description,
col1_width=col1_width,
col2_width=col2_width))
print()
def display_ctl_chars(index, ctlc):
"""Display all control character indices, names, and values."""
import termios
title = 'Special Character'
col1_width = len(title)
col2_width = max(map(len, index.values()))
fmt = '{idx:<{col1_width}} {name:<{col2_width}} {value}'
print('Special line Characters'.center(40).rstrip())
print(fmt.format(idx='Index',
name='Name',
value='Value',
col1_width=col1_width,
col2_width=col2_width))
print(f"{'-' * col1_width} {'-' * col2_width} {'-' * 10}")
for index_name, name in index.items():
try:
index = getattr(termios, index_name)
value = ctlc[index]
value = '_POSIX_VDISABLE' if value == b'\xff' else repr(value)
except AttributeError:
value = 'undef'
print(fmt.format(idx=index_name,
name=name,
value=value,
col1_width=col1_width,
col2_width=col2_width))
print()
def display_pathconf(names, getter):
"""Helper displays results of os.pathconf_names values."""
col1_width = max(map(len, names))
fmt = '{name:>{col1_width}} {value}'
print(fmt.format(name='pathconf'.ljust(col1_width), value='value',
col1_width=col1_width))
print(f"{'-' * col1_width} {'-' * 27}")
for name in names:
try:
value = getter(name)
except OSError as err:
value = f'OSErrno {err.errno}'
print(fmt.format(name=name, value=value, col1_width=col1_width))
print()
def main():
"""Program entry point."""
if platform.system() == 'Windows':
print('No terminal on windows systems!')
exit(0)
import termios
fd = sys.stdin.fileno()
locale.setlocale(locale.LC_ALL, '')
encoding = locale.getpreferredencoding()
print(f'os.isatty({fd}) => {os.isatty(fd)}')
print(f'locale.getpreferredencoding() => {encoding}')
display_pathconf(names=os.pathconf_names,
getter=lambda name: os.fpathconf(fd, name))
try:
(iflag, oflag, cflag, lflag,
_, _, # input / output speed (bps macros)
ctlc) = termios.tcgetattr(fd)
except termios.error as err:
print(f'stdin is not a typewriter: {err}')
else:
display_bitmask(kind=' Input Mode',
bitmap=BITMAP_IFLAG,
value=iflag)
display_bitmask(kind=' Output Mode',
bitmap=BITMAP_OFLAG,
value=oflag)
display_bitmask(kind='Control Mode',
bitmap=BITMAP_CFLAG,
value=cflag)
display_bitmask(kind=' Local Mode',
bitmap=BITMAP_LFLAG,
value=lflag)
display_ctl_chars(index=CTLCHAR_INDEX,
ctlc=ctlc)
print(f'os.ttyname({fd}) => {os.ttyname(fd)}')
print(f'os.ctermid() => {os.ttyname(fd)}')
if __name__ == '__main__':
main()
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