git-sh-setup: refactor ident-parsing functions
The only ident-parsing function we currently provide is get_author_ident_from_commit. This is not very flexible for two reasons: 1. It takes a commit as an argument, and can't read from commit headers saved on disk. 2. It will only parse authors, not committers. This patch provides a more flexible interface which will parse multiple idents from a commit provide on stdin. We can easily use it as a building block for the current function to retain compatibility. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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