add MinIndex method to Group
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@ -146,6 +146,13 @@ func (g *Group) MaxIndex() int {
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return g.maxIndex
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}
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// MinIndex returns index of the first file in the group.
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func (g *Group) MinIndex() int {
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g.mtx.Lock()
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defer g.mtx.Unlock()
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return g.minIndex
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}
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// Write writes the contents of p into the current head of the group. It
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// returns the number of bytes written. If nn < len(p), it also returns an
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// error explaining why the write is short.
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