Tools/scripts/diff.py

   1 """ Command line interface to difflib.py providing diffs in three 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
   7 """
   8
   9 import sys, os, time, difflib, optparse
  10
  11 usage = "usage: %prog [options] fromfile tofile"
  12 parser = optparse.OptionParser(usage)
  13 parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)')
  14 parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff')
  15 parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff')
  16 parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)')
  17 (options, args) = parser.parse_args()
  18
  19 if len(args) == 0:
  20     parser.print_help()
  21     sys.exit(1)
  22 if len(args) != 2:
  23     parser.error("need to specify both a fromfile and tofile")
  24
  25 n = options.lines
  26 fromfile, tofile = args
  27
  28 fromdate = time.ctime(os.stat(fromfile).st_mtime)
  29 todate = time.ctime(os.stat(tofile).st_mtime)
  30 fromlines = open(fromfile).readlines()
  31 tolines = open(tofile).readlines()
  32
  33 if options.u:
  34     diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
  35 elif options.n:
  36     diff = difflib.ndiff(fromlines, tolines)
  37 else:
  38     diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
  39
  40 sys.stdout.writelines(diff)