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package reachability
import (
"fmt"
"codeberg.org/lindenii/furgit/object"
"codeberg.org/lindenii/furgit/objecttype"
)
func (walk *Walk) expandObjects(item walkItem) ([]walkItem, error) {
ty, err := walk.readHeaderType(item.id)
if err != nil {
return nil, err
}
if item.want != objecttype.TypeInvalid && ty != item.want {
return nil, &ObjectTypeError{OID: item.id, Got: ty, Want: item.want}
}
switch ty {
case objecttype.TypeBlob:
return nil, nil
case objecttype.TypeCommit:
content, err := walk.readBytesContent(item.id)
if err != nil {
return nil, err
}
commit, err := object.ParseCommit(content, item.id.Algorithm())
if err != nil {
return nil, err
}
next := make([]walkItem, 0, len(commit.Parents)+1)
next = append(next, walkItem{id: commit.Tree, want: objecttype.TypeTree})
for _, parent := range commit.Parents {
next = append(next, walkItem{id: parent, want: objecttype.TypeCommit})
}
return next, nil
case objecttype.TypeTree:
content, err := walk.readBytesContent(item.id)
if err != nil {
return nil, err
}
tree, err := object.ParseTree(content, item.id.Algorithm())
if err != nil {
return nil, err
}
next := make([]walkItem, 0, len(tree.Entries))
for _, entry := range tree.Entries {
switch entry.Mode {
case object.FileModeGitlink:
continue
case object.FileModeDir:
next = append(next, walkItem{id: entry.ID, want: objecttype.TypeTree})
case object.FileModeRegular, object.FileModeExecutable, object.FileModeSymlink:
next = append(next, walkItem{id: entry.ID, want: objecttype.TypeBlob})
}
}
return next, nil
case objecttype.TypeTag:
content, err := walk.readBytesContent(item.id)
if err != nil {
return nil, err
}
tag, err := object.ParseTag(content, item.id.Algorithm())
if err != nil {
return nil, err
}
return []walkItem{{id: tag.Target, want: tag.TargetType}}, nil
case objecttype.TypeInvalid, objecttype.TypeFuture, objecttype.TypeOfsDelta, objecttype.TypeRefDelta:
return nil, &ObjectTypeError{OID: item.id, Got: ty, Want: item.want}
}
return nil, fmt.Errorf("reachability: unreachable object type %d", ty)
}
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