log

#!/usr/bin/python -u

"""
Dead Simple Logger (C) 2018 Public Domain :D

Usage: log command args

Runs command as usual but saves a copy of the command and its (standard) output
to $PWD/command.date.time
"""

import sys
from time import ctime, time
from re import sub
from subprocess import PIPE, Popen, call
from os.path import basename

if not sys.argv[1:]: # no arguments
    print "usage: {} program args...".format(sys.argv[0])
    sys.exit(1)

outfn = "_".join([basename(sys.argv[1])] + sys.argv[2:])
outfn = "{}.{}.txt".format(sub(r"[^\w\-\.]+", "_", outfn), int(time()))

proc = Popen(sys.argv[1:], stdout=PIPE, stdin = sys.stdin, stderr = sys.stderr)

print "# logging to:", outfn
start = time()

out = open(outfn, "a", 0) # unbuffered
out.write("# {}\n".format(ctime(start)))
out.write("# {}\n".format(" ".join(sys.argv[1:])))

for line in iter(proc.stdout.readline, b''):
    print line,
    out.write(line)

end = time()
out.write("# {}\n".format(ctime(end)))
out.write("# {} seconds elapsed\n".format(end - start))

sys.exit(proc.returncode)