feat(pkg/printer): add yaml and raw printers

pkg/printer/printer.go

@@ -7,12 +7,14 @@ type Format string
 const (
 	FormatJson  Format = "json"
 	FormatTable Format = "table"
+	FormatYaml  Format = "yaml"
+	FormatRaw   Format = "raw"
 )
 
 func ParseFormat(v string) (Format, error) {
 	format := Format(v)
 	switch format {
-	case FormatTable, FormatJson:
+	case FormatTable, FormatJson, FormatYaml, FormatRaw:
 		return format, nil
 	default:
 		return "", errors.Errorf("invalid format: %s", v)

pkg/printer/raw.go

@@ -0,0 +1,12 @@
+package printer
+
+import (
+	"fmt"
+	"io"
+)
+
+// PrintRaw is a printer that prints the provided value as is
+func PrintRaw(out io.Writer, v interface{}) error {
+	fmt.Fprintln(out, v)
+	return nil
+}

pkg/printer/raw_test.go

@@ -0,0 +1,24 @@
+package printer
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPrintRaw(t *testing.T) {
+	v := struct {
+		A bool
+		B string
+	}{
+		A: false,
+		B: "waltz",
+	}
+
+	b := &bytes.Buffer{}
+	err := PrintRaw(b, v)
+
+	require.Nil(t, err)
+	require.Equal(t, "{false waltz}\n", b.String())
+}

pkg/printer/yaml.go

@@ -0,0 +1,20 @@
+package printer
+
+import (
+	"fmt"
+	"io"
+
+	"gopkg.in/yaml.v2"
+
+	"github.com/pkg/errors"
+)
+
+// PrintYaml is a printer that prints the provided value in yaml
+func PrintYaml(out io.Writer, v interface{}) error {
+	b, err := yaml.Marshal(v)
+	if err != nil {
+		return errors.Wrap(err, "could not marshal value to yaml")
+	}
+	fmt.Fprintln(out, string(b))
+	return nil
+}

pkg/printer/yaml_test.go

@@ -0,0 +1,24 @@
+package printer
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPrintYaml(t *testing.T) {
+	v := struct {
+		A string
+		B bool
+	}{
+		A: "foo",
+		B: true,
+	}
+
+	b := &bytes.Buffer{}
+	err := PrintYaml(b, v)
+
+	require.Nil(t, err)
+	require.Equal(t, "a: foo\nb: true\n\n", b.String())
+}