1 """ Command line interface to difflib.py providing diffs in four formats:

     2 

     3 * ndiff:    lists every line and highlights interline changes.

     4 * context:  highlights clusters of changes in a before/after format.

     5 * unified:  highlights clusters of changes in an inline format.

     6 * html:     generates side by side comparison with change highlights.

     7 

     8 """

     9 

    10 import sys, os, time, difflib, optparse

    11 

    12 def main():

    13 

    14     usage = "usage: %prog [options] fromfile tofile"

    15     parser = optparse.OptionParser(usage)

    16     parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)')

    17     parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff')

    18     parser.add_option("-m", action="store_true", default=False, help='Produce HTML side by side diff (can use -c and -l in conjunction)')

    19     parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff')

    20     parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)')

    21     (options, args) = parser.parse_args()

    22 

    23     if len(args) == 0:

    24         parser.print_help()

    25         sys.exit(1)

    26     if len(args) != 2:

    27         parser.error("need to specify both a fromfile and tofile")

    28 

    29     n = options.lines

    30     fromfile, tofile = args

    31 

    32     fromdate = time.ctime(os.stat(fromfile).st_mtime)

    33     todate = time.ctime(os.stat(tofile).st_mtime)

    34     fromlines = open(fromfile, 'U').readlines()

    35     tolines = open(tofile, 'U').readlines()

    36 

    37     if options.u:

    38         diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)

    39     elif options.n:

    40         diff = difflib.ndiff(fromlines, tolines)

    41     elif options.m:

    42         diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n)

    43     else:

    44         diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)

    45 

    46     sys.stdout.writelines(diff)

    47 

    48 if __name__ == '__main__':

    49     main()