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Reject to fork when stdin is a TTY

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Shy 2017-04-14 10:41:53 +02:00
parent 310dd05c5c
commit 3a50998567
1 changed files with 38 additions and 36 deletions
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74
kitchentext.py
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@ -1,39 +1,33 @@
#!/usr/bin/env python3
#
# kitchentext: Read text from stdin and put it on the Kitchenlight.
#
# Author: Shy
def kitchentext(delay=200, single=False, wait=False, restore=False, poweron=False,
verbose=False, debug=False):
def kitchentext(delay=200, single=False, wait=False, restore=False,
poweron=False, verbose=False, debug=False):
import sys
from c4ctrl import C4Interface, Kitchenlight
charwidth = { # Width of characters.
'a' : 5, 'A' : 5, 'b' : 4, 'B' : 5,
'c' : 3, 'C' : 5, 'd' : 4, 'D' : 5,
'e' : 4, 'E' : 5, 'f' : 3, 'F' : 5,
'g' : 3, 'G' : 5, 'h' : 3, 'H' : 5,
'i' : 1, 'I' : 5, 'j' : 2, 'J' : 5,
'k' : 3, 'K' : 5, 'l' : 3, 'L' : 5,
'm' : 5, 'M' : 5, 'n' : 4, 'N' : 5,
'o' : 3, 'O' : 5, 'p' : 3, 'P' : 5,
'q' : 3, 'Q' : 5, 'r' : 3, 'R' : 5,
's' : 4, 'S' : 5, 't' : 3, 'T' : 5,
'u' : 3, 'U' : 5, 'v' : 3, 'V' : 5,
'w' : 5, 'W' : 5, 'x' : 3, 'X' : 5,
'y' : 3, 'Y' : 5, 'z' : 3, 'Z' : 5,
'0' : 5, '1' : 4, '2' : 5, '3' : 5,
'4' : 5, '5' : 5, '6' : 5, '7' : 5,
'8' : 5, '9' : 5, '@' : 5, '=' : 3,
'!' : 1, '"' : 3, '_' : 5, '-' : 3,
'.' : 2, ',' : 2, '*' : 5, ':' : 2,
'\'' : 1, '/' : 5, '(' : 2, ')' : 2,
'{' : 3, '}' : 3, '[' : 2, ']' : 2,
'<' : 3, '>' : 4, '+' : 5, '#' : 5,
'$' : 5, '%' : 5, '$' : 5, '~' : 5,
'?' : 3, ';' : 2, '\\' : 5, '^' : 3,
'|' : 1, '`' : 2, ' ' : 3, '\t' : 5
}
'a' : 5, 'A' : 5, 'b' : 4, 'B' : 5, 'c' : 3, 'C' : 5,
'd' : 4, 'D' : 5, 'e' : 4, 'E' : 5, 'f' : 3, 'F' : 5,
'g' : 3, 'G' : 5, 'h' : 3, 'H' : 5, 'i' : 1, 'I' : 5,
'j' : 2, 'J' : 5, 'k' : 3, 'K' : 5, 'l' : 3, 'L' : 5,
'm' : 5, 'M' : 5, 'n' : 4, 'N' : 5, 'o' : 3, 'O' : 5,
'p' : 3, 'P' : 5, 'q' : 3, 'Q' : 5, 'r' : 3, 'R' : 5,
's' : 4, 'S' : 5, 't' : 3, 'T' : 5, 'u' : 3, 'U' : 5,
'v' : 3, 'V' : 5, 'w' : 5, 'W' : 5, 'x' : 3, 'X' : 5,
'y' : 3, 'Y' : 5, 'z' : 3, 'Z' : 5, '0' : 5, '1' : 4,
'2' : 5, '3' : 5, '4' : 5, '5' : 5, '6' : 5, '7' : 5,
'8' : 5, '9' : 5, '@' : 5, '=' : 3, '!' : 1, '"' : 3,
'_' : 5, '-' : 3, '.' : 2, ',' : 2, '*' : 5, ':' : 2,
'\'' : 1, '/' : 5, '(' : 2, ')' : 2, '{' : 3, '}' : 3,
'[' : 2, ']' : 2, '<' : 3, '>' : 4, '+' : 5, '#' : 5,
'$' : 5, '%' : 5, '$' : 5, '~' : 5, '?' : 3, ';' : 2,
'\\' : 5, '^' : 3, '|' : 1, '`' : 2, ' ' : 3, '\t' : 5
}
C4Interface.debug = debug
kl = Kitchenlight(autopower=poweron)
@ -44,7 +38,7 @@ def kitchentext(delay=200, single=False, wait=False, restore=False, poweron=Fals
# Store previous state.
if restore:
c4 = C4Interface()
safe = c4.pull([kl.topic, kl.powertopic])
saved_state = c4.pull([kl.topic, kl.powertopic])
try:
while True:
@ -52,7 +46,7 @@ def kitchentext(delay=200, single=False, wait=False, restore=False, poweron=Fals
try:
text = sys.stdin.readline()
except KeyboardInterrupt: # Exit a bit more graceful on CTRL-C.
verbose and sys.stderr.write("\rInterrupted by user\n")
verbose and print("\nInterrupted by user.", file=sys.stderr)
sys.exit(1)
if single and text.rstrip('\n') == "":
@ -73,27 +67,28 @@ def kitchentext(delay=200, single=False, wait=False, restore=False, poweron=Fals
if wait:
from time import sleep
# How long shall we wait?
# Kitchenlight has 30 columns, each char uses 2-5 columns followed by an empty
# one. The traversal of one column takes 30 * <delay> ms.
# Kitchenlight has 30 columns, each char uses 2-5 columns
# followed by an empty one. The traversal of one column
# takes 30 * <delay> ms.
twidth = 0
for c in text:
try:
twidth += (charwidth[c] + 1)
except KeyError:
twidth += 4 # Fallback
wait_for = ((30 * delay) + (twidth * delay))/1000
wait_for = ((30 * delay) + (twidth * delay)) / 1000
verbose and print("Waiting for {} seconds ...".format(wait_for))
sleep(wait_for)
except KeyboardInterrupt:
verbose and sys.stderr.write("\rInterrupted by user\n")
verbose and print("\nInterrupted by user.", file=sys.stderr)
sys.exit(1)
finally:
# Always restore privious state if "restore" is set.
if restore:
re = []
for top in safe: re.append((top.topic, top.payload))
for top in saved_state: re.append((top.topic, top.payload))
c4.push(re)
@ -113,7 +108,8 @@ if __name__ == "__main__":
help="wait until the text has been displayed")
parser.add_argument(
"-r", "--restore", action="store_true", default=False,
help="restore the Kitchenlight to its prior state after the text has been displayed (implies --wait)")
help="restore the Kitchenlight to its prior state after the text has \
been displayed (implies --wait)")
parser.add_argument(
"-p", "--power-on", action="store_true", default=False,
help="turn on Kitchenlight if it is powered off")
@ -125,13 +121,19 @@ if __name__ == "__main__":
help="be (not much) more verbose")
parser.add_argument(
"--debug", action="store_true",
help="display what would be send to the MQTT broker, but do not actually connect")
help="display what would be send to the MQTT broker, but do not \
actually connect")
args = parser.parse_args()
if args.fork:
import sys
from posix import fork
if sys.stdin.isatty():
print("Error: cannot fork when stdin is connected to a terminal!",
file=sys.stderr)
sys.exit(1)
child_pid = fork()
if child_pid != 0:
args.verbose and print("Forked to PID", child_pid)