status: show more info than "currently not on any branch"
When a remote ref or a tag is checked out, HEAD is automatically detached. There is no user-friendly way to find out what ref is checked out in this case. This patch digs in reflog for this information and shows "HEAD detached from origin/master" or "HEAD detached at v1.8.0" instead of "currently not on any branch". When it cannot figure out the original ref, it shows an abbreviated SHA-1. "Currently not on any branch" would never display (unless reflog is pruned to near empty that the last checkout entry is lost). Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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