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#!/usr/bin/env python3
""" Command line interface to difflib.py providing diffs in four formats:
* ndiff: lists every line and highlights interline changes.
* context: highlights clusters of changes in a before/after format.
* unified: highlights clusters of changes in an inline format.
* html: generates side by side comparison with change highlights.
"""
import sys, os, difflib, argparse
from datetime import datetime, timezone
def file_mtime(path):
t = datetime.fromtimestamp(os.stat(path).st_mtime,
timezone.utc)
return t.astimezone().isoformat()
def main():
parser = argparse.ArgumentParser()
parser.add_argument('-c', action='store_true', default=False,
help='Produce a context format diff (default)')
parser.add_argument('-u', action='store_true', default=False,
help='Produce a unified format diff')
parser.add_argument('-m', action='store_true', default=False,
help='Produce HTML side by side diff '
'(can use -c and -l in conjunction)')
parser.add_argument('-n', action='store_true', default=False,
help='Produce a ndiff format diff')
parser.add_argument('-l', '--lines', type=int, default=3,
help='Set number of context lines (default 3)')
parser.add_argument('fromfile')
parser.add_argument('tofile')
options = parser.parse_args()
n = options.lines
fromfile = options.fromfile
tofile = options.tofile
fromdate = file_mtime(fromfile)
todate = file_mtime(tofile)
with open(fromfile) as ff:
fromlines = ff.readlines()
with open(tofile) as tf:
tolines = tf.readlines()
if options.u:
diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
elif options.n:
diff = difflib.ndiff(fromlines, tolines)
elif options.m:
diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n)
else:
diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
sys.stdout.writelines(diff)
if __name__ == '__main__':
main()