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import sys
import os
from datetime import datetime
# Usage:
# replace_timestamp.py input.txt output.txt timestamp_string
#
# Description:
# Replace timestamp in the input.txt with the difference timestamp to timestamp_string.
#
# Example: replace_timestamp.py input.txt output.txt "01-28 18:12:30.339".
#
def main():
filepath = sys.argv[1]
if not os.path.isfile(filepath):
print("File path {} does not exist. Exiting...".format(filepath))
sys.exit()
output_filepath = sys.argv[2]
timestamp_str = sys.argv[3]
date_time_obj = datetime.strptime(timestamp_str, '%m-%d %H:%M:%S.%f')
output_fp = open(output_filepath, 'w')
i = 1
with open(filepath, 'r', errors = 'ignore') as fp:
for line in fp:
newline = replace_timestamp_abs(line, timestamp_str, date_time_obj)
output_fp.write(newline)
i = i + 1
fp.close()
output_fp.close()
def replace_timestamp_abs(line, timestamp_str, date_time_obj0):
if line[:5] != timestamp_str[:5]:
return line
index = line.find(" ", 6)
if index <= 0:
return line
substr0 = line[:index]
substr1 = line[index:]
try:
date_time_obj = datetime.strptime(substr0, '%m-%d %H:%M:%S.%f')
except ValueError:
return line
date_time_delta = date_time_obj - date_time_obj0
date_time_delta_str = str(date_time_delta)
return date_time_delta_str + substr1
if __name__ == '__main__':
main()
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