Full application rewrite

internal/organizer/modes/copy.go

@@ -0,0 +1,48 @@
+package modes
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+type Copy struct{}
+
+func (c Copy) PlaceIt(sourcePath, targetPath string, mode os.FileMode) error {
+	targetFile, err := os.OpenFile(targetPath, os.O_TRUNC|os.O_RDWR|os.O_CREATE, mode)
+	if err != nil {
+		return fmt.Errorf("open target file: %w", err)
+	}
+
+	defer func() {
+		_ = targetFile.Close()
+	}()
+
+	sourceFile, err := os.OpenFile(sourcePath, os.O_RDONLY, os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("open source file: %w", err)
+	}
+
+	defer func() {
+		_ = sourceFile.Close()
+	}()
+
+	copySize, err := io.Copy(targetFile, sourceFile)
+	if err != nil {
+		return fmt.Errorf("copy source file: %w", err)
+	}
+
+	stat, err := sourceFile.Stat()
+	if err != nil {
+		log.Println("stat source file failed:", err)
+
+		return nil
+	}
+
+	if stat.Size() != copySize {
+		log.Printf("copy source file size not equal target file size: source %d != %d copied\n", stat.Size(), copySize)
+	}
+
+	return nil
+}