Problem: block.go is missing and blockRepo could not be found

Solution: add block.go

block.go

@@ -0,0 +1,59 @@
+/*
+ * Wiki - A wiki with editor
+ * Copyright (c) 2021-2021 Peter Stuifzand
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+type BlockRepository interface {
+	Save(block Block) error
+	Load(id string) (Block, error)
+}
+
+type blockRepo struct {
+	dirname string
+}
+
+func (br *blockRepo) Save(id string, block Block) error {
+	f, err := os.OpenFile(filepath.Join(br.dirname, BlocksDirectory, id), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
+	defer f.Close()
+	if err != nil {
+		return err
+	}
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	return enc.Encode(&block)
+}
+
+func (br *blockRepo) Load(id string) (Block, error) {
+	f, err := os.Open(filepath.Join(br.dirname, BlocksDirectory, id))
+	if err != nil {
+		return Block{}, fmt.Errorf("%q: %w", id, BlockNotFound)
+	}
+	defer f.Close()
+	var block Block
+	err = json.NewDecoder(f).Decode(&block)
+	if err != nil {
+		return Block{}, fmt.Errorf("%q: %w", id, err)
+	}
+	return block, nil
+}