How to use python diff_match_patch to create a patch and apply it

Question

I'm looking for a pythonic way to compare two files file1 and file2 obtain the differences in form of a patch file and merge their differences into file2. The code should do something like this:

diff file1 file2 > diff.patch
apply the patch diff.patch to file2 // this must be doing something like git apply.

I have seen the following post Implementing Google's DiffMatchPatch API for Python 2/3 on google's python API dif_match_patch to find the differences but I'm looking for a solution to create and apply patch.

Alexander Farber · Accepted Answer · 2017-03-11 08:37:13Z

3

First you need to install diff_match_patch.

Here is my code:

import sys
import time
import diff_match_patch as dmp_module


def readFileToText(filePath):
	file = open(filePath,"r")
	s = ''
	for line in file:
    		s = s + line
	return s
    

dmp = dmp_module.diff_match_patch()
origin = sys.argv[1];
lastest = sys.argv[2];

originText = readFileToText(origin)
lastestText = readFileToText(lastest)

patch = dmp.patch_make(originText, lastestText)
patchText = dmp.patch_toText(patch)

# floder = sys.argv[1]
floder = '/Users/test/Documents/patch'
print(floder)
patchFilePath = floder
patchFile = open(patchFilePath,"w")
patchFile.write(patchText)

print(patchText)

edited Mar 11, 2017 at 8:37

Alexander Farber

23.4k79 gold badges263 silver badges449 bronze badges

answered Mar 11, 2017 at 8:16

njafei

1076 bronze badges

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