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show numeric deltas for repeated runs of a command
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#!/usr/bin/python | |
import re | |
import sys | |
import time | |
import subprocess | |
SLEEP_FOR = 2.0 | |
RED = 196 | |
NUMBER_REGEX = re.compile(r'-?\d+') | |
def colorize(text, color): | |
return '\033[38;5;%sm%s\033[0;00m' % (color, text) | |
if __name__ == '__main__': | |
if len(sys.argv) < 2: | |
print "Usage: ./delta COMMAND" | |
sys.exit(1) | |
command = " ".join(sys.argv[1:]) + "; exit 0;" | |
result = [] | |
prev_result = [] | |
now = time.time() | |
while True: | |
result = subprocess.check_output(command, shell=True) | |
delta_t = time.time() - now | |
now = time.time() | |
if result: | |
result = result.split('\n') | |
subbed_lines = [] | |
for (index, line) in enumerate(result): | |
if index < len(prev_result): | |
prev_matches = list(NUMBER_REGEX.findall(prev_result[index])) | |
def delta_from_prev_match(match): | |
delta_v = int(match.group(0)) - int(prev_matches.pop(0)) if len(prev_matches) > 0 else 0 | |
return colorize("%0.1f/sec" % (delta_v / delta_t), RED) if delta_v != 0 else match.group(0) | |
subbed_lines.append(NUMBER_REGEX.sub(delta_from_prev_match, line)) | |
else: | |
subbed_lines.append(line) | |
print '\n'.join(subbed_lines) | |
prev_result = result | |
time.sleep(SLEEP_FOR) |
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For extra credit, you could move the re.compile out of the loop and (uselessly?) improve performance somewhat