First, decide if you want to pull with rebase. There are some implications of changing this, so think before you do it.

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If you do, you can tell git to stash automatically before pulling:

git config --global rebase.autoStash true

Now on pull, git will a) stash, b) pull and c) reapply your working tree. Note that applying your changes may lead to unresolvable conflicts!

Further see a common git config with this configuration enabled.