Thursday, July 23, 2009

Git supports commiting specific parts of a file

While working on my web based learning project, I made a lot of changes to a Django view file without committing them. When I actually decided to commit, I realized that the changes in my view file should go into separate commits. I knew it was possible to commit parts of a file in Git, but I was not sure exactly how it could be done.

I asked the question on StackOverflow and got an answer within minutes :-)

Anyways here's how I did it. I had 3 files in my index:

The first 2 files were fine, but I did not want to commit the entire view file with the first two, I wanted only one change in that file to go in this commit.

Since I had already added the view file to the index, I first had to unstage it with:

git reset app/courses/

Then I did an interactive add to add only one hunk from the view file:

git add --patch apps/courses/

Running this command showed me the first hunk from the file and an option asking me if I wanted ti stage that hunk. I decided I did not want the first hunk, then it showed me the second hunk. This was the change I wanted, so I entered 'y' at the option and proceeded to enter 'n' for all the remaining hunks.

After this I wanted to ensure that the right hunk from the file was staged to be committed, so I typed:

git diff --color --cached apps/courses/

This showed me all the changed that were staged. After ensuring that the changes I wanted were the ones staged, I commited them with:

git commit

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