unidiff2 0.7.8

Unified diff parsing/metadata extraction library.

Simple Python library to parse and interact with unified diff data.

The original version seems not to be actively maintained. This repository intend to offer an actively maintained version of unidiff.

Installing unidiff

$ pip install unidiff2

Quick start

>>> import urllib.request
>>> from unidiff import PatchSet
>>> diff = urllib.request.urlopen('https://github.com/matiasb/python-unidiff/pull/3.diff')
>>> encoding = diff.headers.get_charsets()[0]
>>> patch = PatchSet(diff, encoding=encoding)
>>> patch
<PatchSet: [<PatchedFile: .gitignore>, <PatchedFile: unidiff/patch.py>, <PatchedFile: unidiff/utils.py>]>
>>> patch[0]
<PatchedFile: .gitignore>
>>> patch[0].is_added_file
True
>>> patch[0].added
6
>>> patch[1]
<PatchedFile: unidiff/patch.py>
>>> patch[1].added, patch[1].removed
(20, 11)
>>> len(patch[1])
6
>>> patch[1][2]
<Hunk: @@ 109,14 110,21 @@ def __repr__(self):>
>>> patch[2]
<PatchedFile: unidiff/utils.py>
>>> print(patch[2])
diff --git a/unidiff/utils.py b/unidiff/utils.py
index eae63e6..29c896a 100644
--- a/unidiff/utils.py
+++ b/unidiff/utils.py
@@ -37,4 +37,3 @@
# - deleted line
# \ No newline case (ignore)
RE_HUNK_BODY_LINE = re.compile(r'^([- \+\\])')
-

Load unified diff data by instantiating PatchSet with a file-like object as argument, or using PatchSet.from_filename class method to read diff from file.

A PatchSet is a list of files updated by the given patch. For each PatchedFile you can get stats (if it is a new, removed or modified file; the source/target lines; etc), besides having access to each hunk (also like a list) and its respective info.

At any point you can get the string representation of the current object, and that will return the unified diff data of it.

As a quick example of what can be done, check bin/unidiff file.

Also, once installed, unidiff provides a command-line program that displays information from diff data (a file, or stdin). For example:

$ git diff | unidiff
Summary
-------
README.md: +6 additions, -0 deletions

1 modified file(s), 0 added file(s), 0 removed file(s)
Total: 6 addition(s), 0 deletion(s)

Load a local diff file

To instantiate PatchSet from a local file, you can use:

>>> from unidiff import PatchSet
>>> patch = PatchSet.from_filename('tests/samples/bzr.diff', encoding='utf-8')
>>> patch
<PatchSet: [<PatchedFile: added_file>, <PatchedFile: modified_file>, <PatchedFile: removed_file>]>

Notice the (optional) encoding parameter. If not specified, unicode input will be expected. Or alternatively:

>>> import codecs
>>> from unidiff import PatchSet
>>> with codecs.open('tests/samples/bzr.diff', 'r', encoding='utf-8') as diff:
...     patch = PatchSet(diff)
...
>>> patch
<PatchSet: [<PatchedFile: added_file>, <PatchedFile: modified_file>, <PatchedFile: removed_file>]>

Finally, you can also instantiate PatchSet passing any iterable (and encoding, if needed):

>>> from unidiff import PatchSet
>>> with open('tests/samples/bzr.diff', 'r') as diff:
...     data = diff.readlines()
...
>>> patch = PatchSet(data)
>>> patch
<PatchSet: [<PatchedFile: added_file>, <PatchedFile: modified_file>, <PatchedFile: removed_file>]>

If you don’t need to be able to rebuild the original unified diff input, you can pass metadata_only=True (defaults to False), which should help making the parsing more efficient:

>>> from unidiff import PatchSet
>>> patch = PatchSet.from_filename('tests/samples/bzr.diff', encoding='utf-8', metadata_only=True)

References

• https://en.wikipedia.org/wiki/Diff_utility

• https://www.artima.com/weblogs/viewpost.jsp?thread=164293