add refs (#98)

internal/store/client.go

@@ -4,14 +4,16 @@ type Client struct {
 	Conf         *Config
 	Idx          *Index
 	Head         *Head
+	Refs         *Refs
 	RootGoitPath string
 }
 
-func NewClient(config *Config, index *Index, head *Head, rootGoitPath string) *Client {
+func NewClient(config *Config, index *Index, head *Head, refs *Refs, rootGoitPath string) *Client {
 	return &Client{
 		Conf:         config,
 		Idx:          index,
 		Head:         head,
+		Refs:         refs,
 		RootGoitPath: rootGoitPath,
 	}
 }

internal/store/refs.go

@@ -0,0 +1,57 @@
+package store
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/JunNishimura/Goit/internal/sha"
+)
+
+type branch struct {
+	Name string
+	hash sha.SHA1
+}
+
+type Refs struct {
+	Heads []*branch
+}
+
+func NewRefs(rootGoitPath string) (*Refs, error) {
+	r := newRefs()
+	headsPath := filepath.Join(rootGoitPath, "refs", "heads")
+	files, err := os.ReadDir(headsPath)
+	if err != nil {
+		return nil, err
+	}
+	for _, file := range files {
+		b, err := newBranch(rootGoitPath, file.Name())
+		if err != nil {
+			return nil, err
+		}
+		r.Heads = append(r.Heads, b)
+	}
+	return r, nil
+}
+
+func newRefs() *Refs {
+	return &Refs{
+		Heads: make([]*branch, 0),
+	}
+}
+
+func newBranch(rootGoitPath, branchName string) (*branch, error) {
+	branchPath := filepath.Join(rootGoitPath, "refs", "heads", branchName)
+	hashByte, err := os.ReadFile(branchPath)
+	if err != nil {
+		return nil, err
+	}
+	hashString := string(hashByte)
+	hash, err := sha.ReadHash(hashString)
+	if err != nil {
+		return nil, err
+	}
+	return &branch{
+		Name: branchName,
+		hash: hash,
+	}, nil
+}