1#!/usr/bin/env python 2""" Command line interface to difflib.py providing diffs in four formats: 3 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. 8 9""" 10 11import sys, os, time, difflib, optparse 12 13def main(): 14 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() 23 24 if len(args) == 0: 25 parser.print_help() 26 sys.exit(1) 27 if len(args) != 2: 28 parser.error("need to specify both a fromfile and tofile") 29 30 n = options.lines 31 fromfile, tofile = args 32 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() 37 38 if options.u: 39 diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) 40 elif options.n: 41 diff = difflib.ndiff(fromlines, tolines) 42 elif options.m: 43 diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n) 44 else: 45 diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) 46 47 sys.stdout.writelines(diff) 48 49if __name__ == '__main__': 50 main() 51