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34 lines
549 B
Go
34 lines
549 B
Go
package pruning
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import (
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"sort"
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"github.com/pkg/errors"
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)
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type KeepLastN struct {
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n int
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}
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func NewKeepLastN(n int) (*KeepLastN, error) {
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if n <= 0 {
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return nil, errors.Errorf("must specify positive number as 'keep last count', got %d", n)
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}
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return &KeepLastN{n}, nil
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}
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func (k KeepLastN) KeepRule(snaps []Snapshot) (destroyList []Snapshot) {
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if k.n > len(snaps) {
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return []Snapshot{}
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}
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res := shallowCopySnapList(snaps)
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sort.Slice(res, func(i, j int) bool {
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return res[i].Date().After(res[j].Date())
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})
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return res[k.n:]
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}
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