cpython: 8777e59a99bd (original) (raw)

--- a/Doc/library/difflib.rst +++ b/Doc/library/difflib.rst @@ -743,65 +743,4 @@ This example shows how to use difflib to It is also contained in the Python source distribution, as :file:Tools/scripts/diff.py. -.. testcode:: -

""" Command line interface to difflib.py providing diffs in four 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.
- html: generates side by side comparison with change highlights. -
""" -
import sys, os, time, difflib, optparse -
def main():

   # Configure the option parser[](#l1.21)

  usage = "usage: %prog [options] fromfile tofile"[](#l1.22)

  parser = optparse.OptionParser(usage)[](#l1.23)

  parser.add_option("-c", action="store_true", default=False,[](#l1.24)

                    help='Produce a context format diff (default)')[](#l1.25)

  parser.add_option("-u", action="store_true", default=False,[](#l1.26)

                    help='Produce a unified format diff')[](#l1.27)

  hlp = 'Produce HTML side by side diff (can use -c and -l in conjunction)'[](#l1.28)

  parser.add_option("-m", action="store_true", default=False, help=hlp)[](#l1.29)

  parser.add_option("-n", action="store_true", default=False,[](#l1.30)

                    help='Produce a ndiff format diff')[](#l1.31)

  parser.add_option("-l", "--lines", type="int", default=3,[](#l1.32)

                    help='Set number of context lines (default 3)')[](#l1.33)

  (options, args) = parser.parse_args()[](#l1.34)

```
  if len(args) == 0:[](#l1.36)
```
```
      parser.print_help()[](#l1.37)
```
```
      sys.exit(1)[](#l1.38)
```
```
  if len(args) != 2:[](#l1.39)
```

      parser.error("need to specify both a fromfile and tofile")[](#l1.40)

```
  n = options.lines[](#l1.42)
```

  fromfile, tofile = args # as specified in the usage string[](#l1.43)

  # we're passing these as arguments to the diff function[](#l1.45)

  fromdate = time.ctime(os.stat(fromfile).st_mtime)[](#l1.46)

  todate = time.ctime(os.stat(tofile).st_mtime)[](#l1.47)

  with open(fromfile) as fromf, open(tofile) as tof:[](#l1.48)

      fromlines, tolines = list(fromf), list(tof)[](#l1.49)

```
  if options.u:[](#l1.51)
```

      diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile,[](#l1.52)

                                  fromdate, todate, n=n)[](#l1.53)

```
  elif options.n:[](#l1.54)
```

      diff = difflib.ndiff(fromlines, tolines)[](#l1.55)

```
  elif options.m:[](#l1.56)
```

      diff = difflib.HtmlDiff().make_file(fromlines, tolines, fromfile,[](#l1.57)

                                          tofile, context=options.c,[](#l1.58)

                                          numlines=n)[](#l1.59)

```
  else:[](#l1.60)
```

      diff = difflib.context_diff(fromlines, tolines, fromfile, tofile,[](#l1.61)

                                  fromdate, todate, n=n)[](#l1.62)

  # we're using writelines because diff is a generator[](#l1.64)

```
  sys.stdout.writelines(diff)[](#l1.65)
```

if name == 'main':
```
  main()[](#l1.68)
```

+.. literalinclude:: ../../Tools/scripts/diff.py