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Git’s Patch Mode

Let’s say we’ve just changed some CSS in a file and we want to stage it with Git.You might do something like this:

git add styles.css

…and then we’d want to make a commit with that staged code:

git commit -m "Fixed the CSS"

I’ve been doing this for a long time, but there’s lots of problems with this approach. For one, what happens if you changed more than one thing in `styles.css`? Perhaps we changed the borders of an element and then we changed the background color of an element that’s completely unrelated to the first. Well, it’s going to be very difficult to understand the history of our commits if we run git log .

This is where Git’s patch mode comes in. It’s a thoroughly helpful flag that lets us split parts of a file so that we can stage and commit each part separately.

git add -p styles.css

Once we run that command we should see something like this:

Git’s Patch Mode

We’ve made two changes on two separate elements, but there are all sorts of commands that we can run on something called a “hunk”. What we see here is one part of the codebase, or one hunk, but to see what all these commands mean we can just type ? . This will list all of the commands for us:

Git’s Patch Mode

In this case, our two changes that we’ve made are currently part of the same hunk, so we’ll need to split them by typing s .

Git’s Patch Mode

Now we can see that only the changes on the .table class have been selected, which is precisely what we wanted. Then all we have to do is type y to stage that hunk. However, git will give us the option to stage more hunks which is useful when we make similar changes to different parts of the codebase. Yet in this situation we just want to quit out of this process so we’ll need to run q .

This all makes more sense when we type git status into the command line; we’ll see that we’ve added some code from styles.css and if we run git diff styles.css we’ll see that only one line of CSS has been staged:

Git’s Patch Mode

All that’s left is to make the commit whilst making sure we write something memorable for future reference, such as:

git commit -m "fixed the border of the form"

This way we can scan through our commit history and understand it all much more easily.

Yay for Git’s patch mode!

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