Reader -> Reader+Parser refactoring: moved the

reading of the lines to its own function

io/reader/text.go

@@ -12,18 +12,30 @@ type TextReader struct {
 }
 
 func (r TextReader) Read() (*maze.RawMaze, error) {
-	var lines []string
+	lines, err := getLines(r.Filename)
-
-	if _, err := os.Stat(r.Filename); err != nil {
-		return nil, err
-	}
-
-	file, err := os.Open(r.Filename)
 	if err != nil {
 		return nil, err
 	}
 
-	{
+	return &maze.RawMaze{
+		PathChar: r.PathChar,
+		WallChar: r.WallChar,
+		Data:     *lines,
+	}, nil
+}
+
+func getLines(filename string) (*[]string, error) {
+	var lines []string
+	if _, err := os.Stat(filename); err != nil {
+		return nil, err
+	}
+
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
 	scanner := bufio.NewScanner(file)
 	scanner.Split(bufio.ScanLines)
 
@@ -31,8 +43,6 @@ func (r TextReader) Read() (*maze.RawMaze, error) {
 		line := scanner.Text()
 		lines = append(lines, line)
 	}
-		file.Close()
-	}
 
-	return &maze.RawMaze{PathChar: r.PathChar, WallChar: r.WallChar, Data: lines}, nil
+	return &lines, nil
 }