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|
// Package packed provides a packed refs backend.
package packed
import (
"fmt"
"os"
"path"
"codeberg.org/lindenii/furgit/objectid"
"codeberg.org/lindenii/furgit/ref"
"codeberg.org/lindenii/furgit/refstore"
)
// Store reads references from a parsed packed-refs snapshot.
type Store struct {
byName map[string]ref.Detached
ordered []ref.Detached
}
var _ refstore.Store = (*Store)(nil)
// New parses packed-refs from one repository root using the given object ID
// algorithm.
func New(root *os.Root, algo objectid.Algorithm) (*Store, error) {
if algo.Size() == 0 {
return nil, objectid.ErrInvalidAlgorithm
}
packedRefs, err := root.Open("packed-refs")
if err != nil {
return nil, fmt.Errorf("refstore/packed: open packed-refs: %w", err)
}
defer func() { _ = packedRefs.Close() }()
byName, ordered, err := parsePackedRefs(packedRefs, algo)
if err != nil {
return nil, err
}
return &Store{
byName: byName,
ordered: ordered,
}, nil
}
// Resolve resolves a packed reference name to a detached ref.
func (store *Store) Resolve(name string) (ref.Ref, error) {
detached, ok := store.byName[name]
if !ok {
return nil, refstore.ErrReferenceNotFound
}
return detached, nil
}
// ResolveFully resolves a packed reference name to a detached ref.
//
// Packed refs are detached-only, so ResolveFully is equivalent to Resolve.
func (store *Store) ResolveFully(name string) (ref.Detached, error) {
detached, ok := store.byName[name]
if !ok {
return ref.Detached{}, refstore.ErrReferenceNotFound
}
return detached, nil
}
// List lists packed references matching pattern.
//
// Pattern uses path.Match syntax against full reference names.
// Empty pattern matches all references.
func (store *Store) List(pattern string) ([]ref.Ref, error) {
matchAll := pattern == ""
if !matchAll {
_, err := path.Match(pattern, "refs/heads/main")
if err != nil {
return nil, err
}
}
refs := make([]ref.Ref, 0, len(store.ordered))
for _, entry := range store.ordered {
if !matchAll {
matched, err := path.Match(pattern, entry.Name())
if err != nil {
return nil, err
}
if !matched {
continue
}
}
refs = append(refs, entry)
}
return refs, nil
}
// Shorten returns the shortest unambiguous shorthand for a packed ref name.
func (store *Store) Shorten(name string) (string, error) {
_, ok := store.byName[name]
if !ok {
return "", refstore.ErrReferenceNotFound
}
names := make([]string, 0, len(store.ordered))
for _, entry := range store.ordered {
names = append(names, entry.Name())
}
return refstore.ShortenName(name, names), nil
}
// Close releases resources associated with the backend.
func (store *Store) Close() error {
return nil
}
|
