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The ref-filter module currently provides a callback suitable for parsing command-line --sort options. But since git-tag also supports the tag.sort config option, it needs a function whose implementation is quite similar, but with a slightly different interface. The end result is that builtin/tag.c has a copy-paste of parse_opt_ref_sorting(). Instead, let's provide a function to parse an arbitrary sort string, which we can then trivially wrap to make the parse_opt variant. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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