Added a store

store.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/kirsle/configdir"
+)
+
+const (
+	packageName = "dev.lmika.dequoter"
+)
+
+type Store struct {
+	storeDir           string
+	currentBufferIndex int
+}
+
+func NewStore() (*Store, error) {
+	cfgDir := configdir.LocalConfig(packageName)
+	if err := os.MkdirAll(cfgDir, 0755); err != nil {
+		return nil, err
+	}
+
+	return &Store{
+		storeDir:           cfgDir,
+		currentBufferIndex: 0,
+	}, nil
+}
+
+func (s *Store) LoadBuffer() (string, error) {
+	return s.loadBuffer(fmt.Sprintf("%02d", s.currentBufferIndex))
+}
+
+func (s *Store) SaveBuffer(buffer string) error {
+	return s.saveBuffer(fmt.Sprintf("%02d", s.currentBufferIndex), buffer)
+}
+
+func (s *Store) loadBuffer(name string) (string, error) {
+	bfrFilename := filepath.Join(s.storeDir, fmt.Sprintf("%s.buffer", name))
+	bts, err := os.ReadFile(bfrFilename)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return "", nil
+		}
+		return "", err
+	}
+
+	return string(bts), err
+}
+
+func (s *Store) saveBuffer(name string, buffer string) error {
+	bfrFilename := filepath.Join(s.storeDir, fmt.Sprintf("%s.buffer", name))
+	return os.WriteFile(bfrFilename, []byte(buffer), 0644)
+}