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A git-diff tip

One of the things with git that you can mess-up, if you are not used to, is git diff. A friend of mine was trying to add a couple of new files, and changes to existing files. But, he was on the wrong branch, and wanted to change to a different branch, before committing. Being new to git, he wanted to take a patch. Reset the changes, apply the patch back.

This is what he did

git add new_file.txt
git add old_file1.txt old_file2.txt # don't add old_file3.txt

Oh, damn, I want to change the branch.

git diff > a.patch
git reset --hard
git checkout other-branch

Let me commit my changes…

git apply a.patch
git commit -m
git show

Oh crap! Where are my new files? They aren't commited! Lemme add them.

ls new_file.txt
ls: cannot access new_file.txt: No such file or directory

Dammit! Where are my changes gone?

The problem was with git diff. It gives only the only the un-staged changes. --cached option has to specified, to get the staged changes in the diff output. git diff HEAD shows diff output with both staged and un-staged changes.

But the whole workflow above is a beginners workflow. A user comfortable with git would've committed and then moved the commit around using cherry-pick or the like.

git add <all-files>
git commit -m "My awesome changes."  #committed on branch1
git checkout other-branch
git cherry-pick branch1

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