version2 (#1)

Co-authored-by: u80864958 <niklas.breitenstein@bit.admin.ch>
Reviewed-on: #1

pkg/cat/internal.go

@@ -0,0 +1,58 @@
+package cat
+
+import (
+	"bufio"
+	"io"
+	"os"
+	"path"
+	"strings"
+)
+
+func (c Cater) dir(dir string) error {
+	files, err := os.ReadDir(dir)
+	if err != nil {
+		return err
+	}
+
+	for _, file := range files {
+		i, err := file.Info()
+		if err != nil {
+			continue
+		}
+		path := path.Join(dir, i.Name())
+
+		if !file.IsDir() {
+			c.file(path)
+		} else {
+			c.dir(path)
+		}
+	}
+	return nil
+}
+
+func (c Cater) file(filePath string) error {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	// read file into strings.Builder
+	var sb strings.Builder
+	reader := bufio.NewReader(file)
+
+	for {
+		line, err := reader.ReadString('\n')
+		if err != nil && err != io.EOF {
+			return err
+		}
+		sb.WriteString(line)
+		if err == io.EOF {
+			break
+		}
+	}
+
+	c[filePath] = sb.String()
+
+	return nil
+}