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Document the master@{n} reflog query syntax.
In ab2a1a32
Junio improved the reflog query logic to support
obtaining the n-th prior value of a ref, but this was never
documented in git-rev-parse. Now it is.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
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@ -152,6 +152,14 @@ blobs contained in a commit.
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used immediately following a ref name and the ref must have an
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existing log ($GIT_DIR/logs/<ref>).
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* A ref followed by the suffix '@' with an ordinal specification
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enclosed in a brace pair (e.g. '\{1\}', '\{15\}') to specify
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the n-th prior value of that ref. For example 'master@\{1\}'
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is the immediate prior value of 'master' while 'master@\{5\}'
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is the 5th prior value of 'master'. This suffix may only be used
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immediately following a ref name and the ref must have an existing
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log ($GIT_DIR/logs/<ref>).
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* A suffix '{caret}' to a revision parameter means the first parent of
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that commit object. '{caret}<n>' means the <n>th parent (i.e.
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'rev{caret}'
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