ref: 2aec1f8a09ae0bc9fb269d84ef53defebc47eede
dir: /sys/src/cmd/python/Demo/scripts/lpwatch.py/
#! /usr/bin/env python
# Watch line printer queue(s).
# Intended for BSD 4.3 lpq.
import posix
import sys
import time
import string
DEF_PRINTER = 'psc'
DEF_DELAY = 10
def main():
delay = DEF_DELAY # XXX Use getopt() later
try:
thisuser = posix.environ['LOGNAME']
except:
thisuser = posix.environ['USER']
printers = sys.argv[1:]
if printers:
# Strip '-P' from printer names just in case
# the user specified it...
for i in range(len(printers)):
if printers[i][:2] == '-P':
printers[i] = printers[i][2:]
else:
if posix.environ.has_key('PRINTER'):
printers = [posix.environ['PRINTER']]
else:
printers = [DEF_PRINTER]
#
clearhome = posix.popen('clear', 'r').read()
#
while 1:
text = clearhome
for name in printers:
text = text + makestatus(name, thisuser) + '\n'
print text
time.sleep(delay)
def makestatus(name, thisuser):
pipe = posix.popen('lpq -P' + name + ' 2>&1', 'r')
lines = []
users = {}
aheadbytes = 0
aheadjobs = 0
userseen = 0
totalbytes = 0
totaljobs = 0
while 1:
line = pipe.readline()
if not line: break
fields = string.split(line)
n = len(fields)
if len(fields) >= 6 and fields[n-1] == 'bytes':
rank = fields[0]
user = fields[1]
job = fields[2]
files = fields[3:-2]
bytes = eval(fields[n-2])
if user == thisuser:
userseen = 1
elif not userseen:
aheadbytes = aheadbytes + bytes
aheadjobs = aheadjobs + 1
totalbytes = totalbytes + bytes
totaljobs = totaljobs + 1
if users.has_key(user):
ujobs, ubytes = users[user]
else:
ujobs, ubytes = 0, 0
ujobs = ujobs + 1
ubytes = ubytes + bytes
users[user] = ujobs, ubytes
else:
if fields and fields[0] <> 'Rank':
line = string.strip(line)
if line == 'no entries':
line = name + ': idle'
elif line[-22:] == ' is ready and printing':
line = name
lines.append(line)
#
if totaljobs:
line = '%d K' % ((totalbytes+1023)/1024)
if totaljobs <> len(users):
line = line + ' (%d jobs)' % totaljobs
if len(users) == 1:
line = line + ' for %s' % (users.keys()[0],)
else:
line = line + ' for %d users' % len(users)
if userseen:
if aheadjobs == 0:
line = line + ' (%s first)' % thisuser
else:
line = line + ' (%d K before %s)' % (
(aheadbytes+1023)/1024, thisuser)
lines.append(line)
#
sts = pipe.close()
if sts:
lines.append('lpq exit status %r' % (sts,))
return string.joinfields(lines, ': ')
if __name__ == "__main__":
try:
main()
except KeyboardInterrupt:
pass