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package memory
import (
"fmt"
"path"
"slices"
"strings"
"codeberg.org/lindenii/furgit/ref"
refstore "codeberg.org/lindenii/furgit/ref/store"
)
// Resolve resolves one reference name
// from the in-memory namespace.
func (store *Store) Resolve(name string) (ref.Ref, error) { //nolint:ireturn
store.mu.RLock()
defer store.mu.RUnlock()
return publicRef(name, store.refs[name])
}
// ResolveToDetached resolves symbolic references
// through the in-memory namespace
// until one detached reference is reached.
func (store *Store) ResolveToDetached(name string) (ref.Detached, error) {
store.mu.RLock()
defer store.mu.RUnlock()
return store.resolveToDetachedLocked(name)
}
// List lists references from the in-memory namespace.
func (store *Store) List(pattern string) ([]ref.Ref, error) {
matchAll := pattern == ""
if !matchAll {
_, err := path.Match(pattern, "HEAD")
if err != nil {
return nil, err
}
}
store.mu.RLock()
defer store.mu.RUnlock()
names := make([]string, 0, len(store.refs))
for name := range store.refs {
if !matchAll {
matched, err := path.Match(pattern, name)
if err != nil {
return nil, err
}
if !matched {
continue
}
}
names = append(names, name)
}
slices.Sort(names)
refs := make([]ref.Ref, 0, len(names))
for _, name := range names {
resolved, err := publicRef(name, store.refs[name])
if err != nil {
return nil, err
}
refs = append(refs, resolved)
}
return refs, nil
}
func (store *Store) resolveToDetachedLocked(name string) (ref.Detached, error) {
cur := name
seen := make(map[string]struct{})
for {
if _, ok := seen[cur]; ok {
return ref.Detached{}, fmt.Errorf("refstore/memory: symbolic reference cycle at %q", cur)
}
seen[cur] = struct{}{}
resolved, err := publicRef(cur, store.refs[cur])
if err != nil {
return ref.Detached{}, err
}
switch resolved := resolved.(type) {
case ref.Detached:
return resolved, nil
case ref.Symbolic:
target := strings.TrimSpace(resolved.Target)
if target == "" {
return ref.Detached{}, fmt.Errorf("refstore/memory: symbolic reference %q has empty target", resolved.Name())
}
cur = target
default:
return ref.Detached{}, fmt.Errorf("refstore/memory: unsupported reference type %T", resolved)
}
}
}
func publicRef(name string, stored storedRef) (ref.Ref, error) { //nolint:ireturn
switch stored.kind {
case storedDetached:
detached := ref.Detached{RefName: name, ID: stored.id}
if stored.peeled != nil {
peeled := *stored.peeled
detached.Peeled = &peeled
}
return detached, nil
case storedSymbolic:
return ref.Symbolic{RefName: name, Target: stored.target}, nil
case storedMissing:
return nil, refstore.ErrReferenceNotFound
default:
return nil, fmt.Errorf("refstore/memory: unsupported stored reference kind %d", stored.kind)
}
}
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