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"""Sean's helper functions for python scripts in ~/bin"""
import termios
import fcntl
import subprocess
import sys
import os
def try_audible_notification(text):
"""Try to send a notification and play a sound. Don't do anything if
can't.
"""
dev_null = open('/dev/null', 'w')
try:
subprocess.Popen(['/usr/bin/notify-send',
'--hint=int:transient:1',
text], stderr=dev_null, env=os.environ)
audio_file = os.path.expanduser('~/lib/annex/doc/sounds/beep.wav')
subprocess.call(['/usr/bin/aplay', audio_file], stderr=dev_null)
except OSError:
pass
except subprocess.CalledProcessError:
pass
dev_null.close()
def print_same_line(line=''):
"""Print and then carriage return to stay on the same line"""
# First clear to end of line: then if last print called this
# function so cursor is at beginning of line, it'll clear out
# previous printed string. Needed in case current line is shorter
# than previous one
sys.stdout.write("\033[K")
sys.stdout.write(line + '\r')
sys.stdout.flush()
# TODO: better: http://stackoverflow.com/a/6599414
# avoids spinning in a tight loop making the CPU run wild
def getch():
"""Get a single char from the keyboard without curses library. From
the Python manual's Library and Extension FAQ
"""
fileno = sys.stdin.fileno()
oldterm = termios.tcgetattr(fileno)
newattr = termios.tcgetattr(fileno)
newattr[3] = newattr[3] & ~termios.ICANON & ~termios.ECHO
termios.tcsetattr(fileno, termios.TCSANOW, newattr)
oldflags = fcntl.fcntl(fileno, fcntl.F_GETFL)
fcntl.fcntl(fileno, fcntl.F_SETFL, oldflags | os.O_NONBLOCK)
try:
while 1:
try:
the_char = sys.stdin.read(1)
break
except IOError:
pass
finally:
termios.tcsetattr(fileno, termios.TCSAFLUSH, oldterm)
fcntl.fcntl(fileno, fcntl.F_SETFL, oldflags)
return the_char
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