binfiles/counter at master · leihog/binfiles · GitHub

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#!/usr/bin/env python
#
# Count occurrences of specified characters from stdin
#
# examples:
# ruby -e '10.times{print %w{- +}[rand 2];sleep 0.25}' | counter +-
# Counter: +:6 -:4
#
# perl -e '$|++;map{print int rand 2?"+":"-";sleep 1}1..10' | counter +-
# Counter: +:3 -:7
#
# echo -n "201005+++--+-201006+---+" | counter +- -g "^[0-9]{6}$"
# 201005 +:4 -:3
# 201006 +:2 -:3
#
# Unexpected characters are sent to stderr
# echo -n "201005+?++--+-201006+---+" | counter +- -g "^[0-9]{6}$"
# ?
# 201005 +:4 -:3
# 201006 +:2 -:3
#
# and they can be redirected without hiding the count
# echo -n "201005+?++--+-201006+---+" | counter +- -g "^[0-9]{6}$" 2>/dev/null
# 201005 +:4 -:3
# 201006 +:2 -:3
#
# or they can be silenced all together
# echo -n "201005+?++--+-201006+---+" | counter +- -qg "^[0-9]{6}$"
# 201005 +:4 -:3
# 201006 +:2 -:3
#
import sys
import time
import signal
import re
import argparse

def signal_handler(signal, frame):
    sys.exit(0)

signal.signal(signal.SIGINT, signal_handler)

triggers = {}

parser = argparse.ArgumentParser(description='Count occurrences of specified characters from stdin')
parser.add_argument("characters", type=str, help="The characters to count. ex: +-")
parser.add_argument("-g", "--group", type=str, dest="group", help="A regexp pattern to group counts by")
parser.add_argument("-s", "-q", "--suppress", action="store_true", dest="suppress", help="Don't send unrecognised characters to stderr")
parser.add_argument("-n", "--no-return", action="store_true", dest="noreturn",
        help="Don't start stderr output with a carriage return. Useful when redirecting stderr")
options = parser.parse_args()

for s in options.characters:
    triggers[s] = 0

buffer = ''
group = ''
prev_row_length = -1

while 1:
    c = sys.stdin.read(1)
    if not c:
        break

    if triggers.has_key(c):
        if options.group and buffer:
            m = re.search(options.group, buffer)
            if m:
                if group:
                    sys.stdout.write("\n")
                group = m.group(0)
                buffer = buffer[:m.start()] + buffer[m.end():]
                for trigger in triggers.keys():
                    triggers[trigger] = 0

        if buffer:
            if not options.suppress:
                if not options.noreturn:
                    sys.stderr.write( "\r" )
                sys.stderr.write( "%s\n" % buffer.ljust(prev_row_length) )
                sys.stderr.flush()
            buffer = ''

        triggers[c] = triggers[c] + 1
    else:
        buffer += c

    if options.group and not group:
        continue

    output = group or "Counter"
    for trigger, count in triggers.items():
        output += " %s:%s" % (trigger, count)

    sys.stdout.write("\r%s" % output)
    sys.stdout.flush()
    prev_row_length = len(output)

sys.stdout.write("\n")
sys.stdout.flush()