this post was submitted on 04 Dec 2023
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TIL git rebase allows merging commits in the middle of a branch commit history (stackoverflow.com)
submitted 10 months ago by lysdexic to c/git
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So I've just learned that git rebase -i allows users to merge individual commits in the middle of a branch's history. For that,

$ git rebase -i

This should bring a list of all commits in reverse order, similar to the one listed below:

pick 2361d4d implements something
pick a700451 fixes a bug
pick 79f9d04 fixes a bug again
pick 3172f07 implements some other thing

# Rebase 484d6d2..3172f07 onto 484d6d2 (4 commands)
#
# Commands:
# p, pick  = use commit
# r, reword  = use commit, but edit the commit message
# e, edit  = use commit, but stop for amending
# s, squash  = use commit, but meld into previous commit
# f, fixup [-C | -c]  = like "squash" but keep only the previous
#                    commit's log message, unless -C is used, in which case
#                    keep only this commit's message; -c is same as -C but
#                    opens the editor
# x, exec  = run command (the rest of the line) using shell
# b, break = stop here (continue rebase later with 'git rebase --continue')
# d, drop  = remove commit
# l, label  = label current HEAD with a name
# t, reset  = reset HEAD to a label
# m, merge [-C  | -c ]  [# ]

It's possible to merge commit 79f9d04 with a700451 by updating the list of commands to set squash instead of pick in the commit you want to flatten onto the previous one, such as:

pick 2361d4d implements something
pick a700451 fixes a bug
squash 79f9d04 fixes a bug again
pick 3172f07 implements some other thing

(...)

Once we save the commit, Git opens an editor to rework the new commit message for the squashed commits, and you're set.

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[–] lysdexic 1 points 10 months ago

I don’t think you mean ‘merge’ - that’s a specific operation. I think you mean ‘squash’, which combines multiple commits into one.

Yes, you are right. I apologize for the terminology mixup. I was referring to how it's possible to join two changesets so that they can be considered in the commit history as a single commit.

Once you get familiar with rebasing, you could try out stacked git.

Thanks for the recommendation, but I'll take a pass. Vanilla Git does the job well.