Some `options` fixes

Add tests for bool type.
Fix subtle bug in TestOptionsApplyInvalid.
Fix options list formatting.

cmd/restic/cmd_options.go

@@ -23,8 +23,14 @@ Exit status is 0 if the command was successful, and non-zero if there was any er
 	DisableAutoGenTag: true,
 	Run: func(cmd *cobra.Command, args []string) {
 		fmt.Printf("All Extended Options:\n")
+		var maxLen int
 		for _, opt := range options.List() {
-			fmt.Printf("  %-15s   %s\n", opt.Namespace+"."+opt.Name, opt.Text)
+			if l := len(opt.Namespace + "." + opt.Name); l > maxLen {
+				maxLen = l
+			}
+		}
+		for _, opt := range options.List() {
+			fmt.Printf("  %*s  %s\n", -maxLen, opt.Namespace+"."+opt.Name, opt.Text)
 		}
 	},
 }

internal/options/options_test.go

@@ -125,6 +125,7 @@ type Target struct {
 	Name    string        `option:"name"`
 	ID      int           `option:"id"`
 	Timeout time.Duration `option:"timeout"`
+	Switch  bool          `option:"switch"`
 	Other   string
 }
 
@@ -155,7 +156,15 @@ var setTests = []struct {
 			"timeout": "10m3s",
 		},
 		Target{
-			Timeout: time.Duration(10*time.Minute + 3*time.Second),
+			Timeout: 10*time.Minute + 3*time.Second,
+		},
+	},
+	{
+		Options{
+			"switch": "true",
+		},
+		Target{
+			Switch: true,
 		},
 	},
 }
@@ -202,6 +211,13 @@ var invalidSetTests = []struct {
 		"ns",
 		`time: missing unit in duration "?2134"?`,
 	},
+	{
+		Options{
+			"switch": "yes",
+		},
+		"ns",
+		`strconv.ParseBool: parsing "yes": invalid syntax`,
+	},
 }
 
 func TestOptionsApplyInvalid(t *testing.T) {
@@ -213,9 +229,9 @@ func TestOptionsApplyInvalid(t *testing.T) {
 				t.Fatalf("expected error %v not found", test.err)
 			}
 
-			matched, err := regexp.MatchString(test.err, err.Error())
-			if err != nil {
-				t.Fatal(err)
+			matched, e := regexp.MatchString(test.err, err.Error())
+			if e != nil {
+				t.Fatal(e)
 			}
 
 			if !matched {
@@ -226,11 +242,11 @@ func TestOptionsApplyInvalid(t *testing.T) {
 }
 
 func TestListOptions(t *testing.T) {
-	var teststruct = struct {
+	teststruct := struct {
 		Foo string `option:"foo" help:"bar text help"`
 	}{}
 
-	var tests = []struct {
+	tests := []struct {
 		cfg  interface{}
 		opts []Help
 	}{
@@ -281,7 +297,7 @@ func TestListOptions(t *testing.T) {
 }
 
 func TestAppendAllOptions(t *testing.T) {
-	var tests = []struct {
+	tests := []struct {
 		cfgs map[string]interface{}
 		opts []Help
 	}{