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package v2
import (
"io"
"math"
"time"
"github.com/go-git/go-git/v5/plumbing"
)
// CommitData is a reduced representation of Commit as presented in the commit graph
// file. It is merely useful as an optimization for walking the commit graphs.
type CommitData struct {
// TreeHash is the hash of the root tree of the commit.
TreeHash plumbing.Hash
// ParentIndexes are the indexes of the parent commits of the commit.
ParentIndexes []uint32
// ParentHashes are the hashes of the parent commits of the commit.
ParentHashes []plumbing.Hash
// Generation number is the pre-computed generation in the commit graph
// or zero if not available.
Generation uint64
// GenerationV2 stores the corrected commit date for the commits
// It combines the contents of the GDA2 and GDO2 sections of the commit-graph
// with the commit time portion of the CDAT section.
GenerationV2 uint64
// When is the timestamp of the commit.
When time.Time
}
// GenerationV2Data returns the corrected commit date for the commits
func (c *CommitData) GenerationV2Data() uint64 {
if c.GenerationV2 == 0 || c.GenerationV2 == math.MaxUint64 {
return 0
}
return c.GenerationV2 - uint64(c.When.Unix())
}
// Index represents a representation of commit graph that allows indexed
// access to the nodes using commit object hash
type Index interface {
// GetIndexByHash gets the index in the commit graph from commit hash, if available
GetIndexByHash(h plumbing.Hash) (uint32, error)
// GetHashByIndex gets the hash given an index in the commit graph
GetHashByIndex(i uint32) (plumbing.Hash, error)
// GetNodeByIndex gets the commit node from the commit graph using index
// obtained from child node, if available
GetCommitDataByIndex(i uint32) (*CommitData, error)
// Hashes returns all the hashes that are available in the index
Hashes() []plumbing.Hash
// HasGenerationV2 returns true if the commit graph has the corrected commit date data
HasGenerationV2() bool
// MaximumNumberOfHashes returns the maximum number of hashes within the index
MaximumNumberOfHashes() uint32
io.Closer
}
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