2 """ Command line interface to difflib.py providing diffs in four formats:
4 * ndiff: lists every line and highlights interline changes.
5 * context: highlights clusters of changes in a before/after format.
6 * unified: highlights clusters of changes in an inline format.
7 * html: generates side by side comparison with change highlights.
11 import sys, os, time, difflib, optparse
15 usage = "usage: %prog [options] fromfile tofile"
16 parser = optparse.OptionParser(usage)
17 parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)')
18 parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff')
19 parser.add_option("-m", action="store_true", default=False, help='Produce HTML side by side diff (can use -c and -l in conjunction)')
20 parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff')
21 parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)')
22 (options, args) = parser.parse_args()
28 parser.error("need to specify both a fromfile and tofile")
31 fromfile, tofile = args
33 fromdate = time.ctime(os.stat(fromfile).st_mtime)
34 todate = time.ctime(os.stat(tofile).st_mtime)
35 fromlines = open(fromfile, 'U').readlines()
36 tolines = open(tofile, 'U').readlines()
39 diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
41 diff = difflib.ndiff(fromlines, tolines)
43 diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n)
45 diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
47 sys.stdout.writelines(diff)
49 if __name__ == '__main__':