Show diff when writing commit messages during an interactive rebase

You can do:

git -c commit.verbose=true rebase --continue

If you get tired copying that command you can create an alias in your ~/.gitconfig:

[alias]
    myrebasecontinue = "!git -c commit.verbose=true rebase --continue"

And now just do:

git myrebasecontinue

To show the diff:

git -c commit.verbose=true rebase --continue

To make all commits verbose without having to specify -c commit.verbose=true every time, add this to ~/.gitconfig:

[commit]
    verbose = true

Reference: man git-config.

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