Diff Patch Parsing Library

The parsedifflib package parses any style of diff patch into an event stream of patch instructions. These instructions can then be applied, colorized, reformatted, dissected, analyzed, etc.

Warning

2013/12/09: currently only the svnlook format and stream-oriented event output is supported. Eventually, all the formats supported by colordiff are intended to be supported as well as structured output.

Usage

import parsedifflib, subprocess

data = subprocess.check_output('svnlook diff /path/to/repos', shell=True)

for event, target in parsedifflib.parse_svnlook(data, {'lineNumbers': True}):

  if event in ( parsedifflib.Event.PATCH_START,
                parsedifflib.Event.PATCH_END,
                parsedifflib.Event.ENTRY_END,
                parsedifflib.Event.LINE_LOC,
                parsedifflib.Event.LINE_SAME,
                parsedifflib.Event.LINE_NOTE,
                parsedifflib.Event.PROPENTRY,
              ):
    continue

  elif event == parsedifflib.Event.ENTRY_START:
    print target.comment

  elif event == parsedifflib.Event.LINE_DELETE:
    print '  - deleted line %d: %s' % (target.oldnum, target.line)

  elif event == parsedifflib.Event.LINE_DELETE:
    print '  + added line %d: %s' % (target.newnum, target.line)

Credits

Much inspiration came from:

• https://github.com/ymattw/cdiff
• https://github.com/kimmel/colordiff