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package reachability
import (
"fmt"
"codeberg.org/lindenii/furgit/errors"
objecttype "codeberg.org/lindenii/furgit/object/type"
)
func (walk *Walk) expandCommits(item walkItem) ([]walkItem, error) {
if walk.reachability.graph != nil { //nolint:nestif
next, graphUsed, err := walk.expandCommitsFromGraph(item.id)
if err != nil {
return nil, err
}
if graphUsed && walk.strict {
err = walk.validateCommitObject(item.id)
if err != nil {
return nil, err
}
}
if graphUsed {
return next, nil
}
}
ty, _, err := walk.reachability.fetcher.Header(item.id)
if err != nil {
return nil, err
}
switch ty {
case objecttype.TypeCommit:
commit, err := walk.reachability.fetcher.ExactCommit(item.id)
if err != nil {
return nil, err
}
next := make([]walkItem, 0, len(commit.Object().Parents))
for _, parent := range commit.Object().Parents {
next = append(next, walkItem{id: parent, want: objecttype.TypeInvalid})
}
return next, nil
case objecttype.TypeTag:
tag, err := walk.reachability.fetcher.ExactTag(item.id)
if err != nil {
return nil, err
}
return []walkItem{{id: tag.Object().TargetID, want: objecttype.TypeInvalid}}, nil
case objecttype.TypeTree, objecttype.TypeBlob, objecttype.TypeInvalid,
objecttype.TypeFuture, objecttype.TypeOfsDelta, objecttype.TypeRefDelta:
return nil, &errors.ObjectTypeError{OID: item.id, Got: ty, Want: objecttype.TypeCommit}
}
return nil, fmt.Errorf("reachability: unreachable object type %d", ty)
}
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