switch: make --orphan switch to an empty tree
Switching and creating branches always involves knowing the <start-point> to begin the new branch from. Sometimes, people want to create a new branch that does not have any commits yet; --orphan is a flag to allow that. --orphan overrides the default of HEAD for <start-point> instead causing us to start from an empty history with all tracked files removed from the index and working tree. The use of --orphan is incompatible with specifying a <start-point>. A note on the implementation. An alternative is just create a dummy commit in-core with empty tree and switch to it. But there's a chance the commit's SHA-1 may end up somewhere permanent like reflog. It's best to make sure "commit" pointer is NULL to avoid it. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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