fix: make formatting consistent in duffle key list (#359)

Closes #325

cmd/duffle/key_list.go

@@ -28,6 +28,7 @@ func newKeyListCmd(w io.Writer) *cobra.Command {
 	var (
 		privateOnly bool
 		publicOnly  bool
+		long        bool
 	)
 	cmd := &cobra.Command{
 		Use:   "list",
@@ -44,21 +45,32 @@ func newKeyListCmd(w io.Writer) *cobra.Command {
 			if publicOnly {
 				rings = []string{h.PublicKeyRing()}
 			}
-			return listKeys(cmd.OutOrStdout(), rings...)
+			return listKeys(cmd.OutOrStdout(), long, rings...)
 		},
 	}
 	cmd.Flags().BoolVarP(&privateOnly, "signing", "s", false, "show private (sign-or-verify) keys")
 	cmd.Flags().BoolVarP(&publicOnly, "verify-only", "p", false, "show public (verify-only) keys")
+	cmd.Flags().BoolVarP(&long, "long", "l", false, "show additional details")
 
 	return cmd
 }
 
-func listKeys(out io.Writer, rings ...string) error {
+func listKeys(out io.Writer, long bool, rings ...string) error {
 	kr, err := signature.LoadKeyRings(rings...)
 	if err != nil {
 		return err
 	}
 
+	if !long {
+		for _, k := range kr.Keys() {
+			name, err := k.UserID()
+			if err != nil {
+				fmt.Fprintln(out, "[anonymous key]")
+			}
+			fmt.Fprintln(out, name)
+		}
+		return nil
+	}
 	table := uitable.New()
 	table.MaxColWidth = 80
 	table.Wrap = true

cmd/duffle/key_list_test.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestListKeys(t *testing.T) {
+	out := bytes.NewBuffer(nil)
+	ring := "../../pkg/signature/testdata/public.gpg"
+	if err := listKeys(out, false, ring); err != nil {
+		t.Fatal(err)
+	}
+
+	is := assert.New(t)
+	lines := strings.Split(out.String(), "\n")
+	is.Len(lines, 3)
+	is.Contains(out.String(), "[email protected]")
+
+	out.Reset()
+	if err := listKeys(out, true, ring); err != nil {
+		t.Fatal(err)
+	}
+	lines = strings.Split(out.String(), "\n")
+	is.Len(lines, 4)
+	is.Contains(out.String(), "[email protected]")
+	is.Contains(out.String(), "FINGERPRINT")
+}