patch_vimdiff

#!/usr/bin/env python3
# GistID: 0fcc596bf72973eef955aa2361cc0e73

import sys
import os
import tempfile
from subprocess import call
import unidiff

if len(sys.argv) != 2:
    print("must specify unified diff file")
    sys.exit(1)

diff = unidiff.PatchSet.from_filename(sys.argv[1])

for filename in diff:
    print("File:", filename.source_file)
    old_parts = tempfile.NamedTemporaryFile(suffix='{}_old'.format(os.path.basename(filename.source_file)),
                                            delete=False,
                                            mode='w+t')
    new_parts = tempfile.NamedTemporaryFile(suffix='{}_new'.format(os.path.basename(filename.target_file)),
                                            delete=False,
                                            mode='w+t')
    for hunk in filename:
        for l in hunk.source:
            if l.startswith(' '):
                old_parts.file.write(l[1:])
                new_parts.file.write(l[1:])
                continue
            if l.startswith('-'):
                old_parts.file.write(l[1:])
                continue
            if l.startswith('+'):
                new_parts.file.write(l[1:])
                continue
    old_parts.file.flush()
    new_parts.file.flush()
    print("old: {}".format(old_parts.name))
    print("new: {}".format(new_parts.name))
    call(['vimdiff', old_parts.name, new_parts.name])
    old_parts.close()
    new_parts.close()