Workflow for partial Git commitsA blog post by Jesse Luoto

Here's the scenario: You've coded for a whole day and not done a single git commit yet. How do you avoid 500+ line commits and break up your work to logical commits?

Copy your workflow from XCode

If you've ever done a commit with XCode, you know that one thing the Apple's developers got right: The Version Editor.

Version Editor lets you go through your changes you've done after your latest commit. Before you write your commit message, you can briefly go through every file and choose whether to include that specific change or not.

How to apply Apple's workflow to command line?

Your regular "time to do a commit" workflow probably looks something like this:

git add .
git commit

The bad news is, that you automatically commit everything that you've touched since the last commit. So how could we change this workflow to have the same effect as with the XCode's version editor?

Introducing stash diff

The good news is, that you can do a trick with the git stash that pretty much mimics the workflow from XCode. This trick being, that you can do a git diff also to the most recent stash:

git diff stash

Which shows the diff to the current stash. We can take it a step further and launch the interactive difftool (I'm using OpenDiff) to go through the diffs, adding the changes back to stage one by one.

Taking it all together

So let's go through the whole workflow one by one.

1. Add everything to git

You should start up with your regular flow to make sure all changes are added to your git.

git add -A

The -A flag adds every file to be committed, regardless of which directory you're currently in.

2. Push the changes to stash

git stash

It doesn't matter if you already have something in your stash, since this command always adds a new stash to the stack.

3. Pick which changes to commit

The following command opens up your difftool, which lets you pick the changes you've made one by one back to stage:

git difftool -y stash

Note that you actually have to select all the changes you want to commit back to your stage. If you're using OpenDiff, it means the arrow should point left to add that change to your commit.

When you're done with the file, hit cmd + Q to exit OpenDiff. When the program prompts you whether to save the file, make sure to overwrite the current file.

4. Perform the commit

Up next is your common routine: committing.

git commit -a

This creates a commit from the changes you just selected from the diff.

5. Pull back rest of the changes

Now we should head back to where we started. We can do this by popping the most recently pushed stash:

git stash pop

Note that the stash we pop does include the changes we already committed, but git just knows that it should discard them, since they're already present in the current branch.

Wrapping it up

So here's the full workflow, ready for you to copy-paste:

git add -A
git stash
git difftool -y stash
git commit -a
git stash pop

Bonus: Alias

As we all like our thing simple, here's a quick alias that will make your life easier.

git config --global alias.pc '!git add -A; git stash; git difftool -y stash; git commit -a; git stash pop;'

Running this command will create a global alias of git pc that does the whole workflow for you (pc as "Partial Commit").



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