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|
package git
import (
"fmt"
"github.com/github/git-sizer/counts"
)
// Commit represents the parts of a commit object that we need.
type Commit struct {
Size counts.Count32
Parents []OID
Tree OID
}
// ParseCommit parses the commit object whose contents are in `data`.
// `oid` is used only in error messages.
func ParseCommit(oid OID, data []byte) (*Commit, error) {
var parents []OID
var tree OID
var treeFound bool
iter, err := NewObjectHeaderIter(oid.String(), data)
if err != nil {
return nil, err
}
for iter.HasNext() {
key, value, err := iter.Next()
if err != nil {
return nil, err
}
switch key {
case "parent":
parent, err := NewOID(value)
if err != nil {
return nil, fmt.Errorf("malformed parent header in commit %s", oid)
}
parents = append(parents, parent)
case "tree":
if treeFound {
return nil, fmt.Errorf("multiple trees found in commit %s", oid)
}
tree, err = NewOID(value)
if err != nil {
return nil, fmt.Errorf("malformed tree header in commit %s", oid)
}
treeFound = true
}
}
if !treeFound {
return nil, fmt.Errorf("no tree found in commit %s", oid)
}
return &Commit{
Size: counts.NewCount32(uint64(len(data))),
Parents: parents,
Tree: tree,
}, nil
}
|
