| """ Command line interface to difflib.py providing diffs in three 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. |
| |
| """ |
| |
| import sys, os, time, difflib, optparse |
| |
| usage = "usage: %prog [options] fromfile tofile" |
| parser = optparse.OptionParser(usage) |
| parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)') |
| parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff') |
| parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff') |
| parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)') |
| (options, args) = parser.parse_args() |
| |
| if len(args) == 0: |
| parser.print_help() |
| sys.exit(1) |
| if len(args) != 2: |
| parser.error("need to specify both a fromfile and tofile") |
| |
| n = options.lines |
| fromfile, tofile = args |
| |
| fromdate = time.ctime(os.stat(fromfile).st_mtime) |
| todate = time.ctime(os.stat(tofile).st_mtime) |
| fromlines = open(fromfile).readlines() |
| tolines = open(tofile).readlines() |
| |
| if options.u: |
| diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) |
| elif options.n: |
| diff = difflib.ndiff(fromlines, tolines) |
| else: |
| diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n) |
| |
| sys.stdout.writelines(diff) |
| |