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This function checks a few different @{}-constructs. The early part checks for and dispatches us to helpers for each construct, but the code for handling @{upstream} is inline. Let's factor this out into its own function. This makes interpret_branch_name more readable, and will make it much simpler to further refactor the function in future patches. While we're at it, let's also break apart the refactored code into a few helper functions. These will be useful if we eventually implement similar @{upstream}-like constructs. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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