how to do a git diff of current commit with last commit using gitpython?

Question

I am trying o grasp gitpython module,

hcommit = repo.head.commit
tdiff = hcommit.diff(\'HEAD~1\')

but tdiff = hcommit.diff(\'HEAD^ H

Answer 1

Sorry to dig up an old thread... If you need to find out which files changed, you can use the .a_path or .b_path attribute of a diff object depending on which one you feed it first. In the example below I'm using the head commit as a so I look at a.

e.g:

# this will compare the most recent commit to the one prior to find out what changed.

from git import repo

repo = git.Repo("path/to/.git directory")
repoDiffs = repo.head.commit.diff('HEAD~1')

for item in repoDiffs:
    print(item.a_path)

Answer 2

import git

repo = git.Repo('repo_path')
commits_list = list(repo.iter_commits())

# --- To compare the current HEAD against the bare init commit
a_commit = commits_list[0]
b_commit = commits_list[-1]

a_commit.diff(b_commit)

This will return a diff object for the commits. There are other ways to achieve this as well. For example (this is copy/pasted from http://gitpython.readthedocs.io/en/stable/tutorial.html#obtaining-diff-information):

```

    hcommit = repo.head.commit
    hcommit.diff()                  # diff tree against index
    hcommit.diff('HEAD~1')          # diff tree against previous tree
    hcommit.diff(None)              # diff tree against working tree

    index = repo.index
    index.diff()                    # diff index against itself yielding empty diff
    index.diff(None)                # diff index against working copy
    index.diff('HEAD')              # diff index against current HEAD tree

```

Answer 3

To get the contents of the diff:

import git
repo = git.Repo("path/of/repo/")

# define a new git object of the desired repo
gitt = repo.git
diff_st = gitt.diff("commitID_A", "commitID_B")

Answer 4

I figured out how to get the git diff using gitPython.

import git
repo = git.Repo("path/of/repo/")

# the below gives us all commits
repo.commits()

# take the first and last commit

a_commit = repo.commits()[0]
b_commit = repo.commits()[1]

# now get the diff
repo.diff(a_commit,b_commit)

Voila !!!

Answer 5

For a proper solution (without using git command callback), you have to use create_patch option.

To compare current index with previous commit:

diff_as_patch = repo.index.diff(repo.commit('HEAD~1'), create_patch=True)
print(diff_as_patch)