format another way

cmd/cli/main.go

@@ -17,6 +17,7 @@ import (
 	"os"
 	"os/signal"
 	"strconv"
+	"strings"
 	"syscall"
 	"time"
 
@@ -399,6 +400,10 @@ func newViewItemsParamsKnownValues() *cli.Command {
 				Name:  "regex",
 				Usage: "Registers regex to match",
 			},
+			&cli.BoolFlag{
+				Name:  "keys-only",
+				Usage: "prints only keys",
+			},
 		},
 		Action: decorateAction(viewItemsParamsKnownValuesAction),
 	}
@@ -611,17 +616,31 @@ func viewItemsParamsKnownValuesAction(ctx context.Context, c *cli.Command) error
 		}
 	}
 
-	tbl := table.New("key", "values").WithWriter(c.Writer)
-	for k, v := range requestedValues {
-		values := make([]string, 0, len(v))
-		for value := range v {
-			values = append(values, strconv.Quote(value))
-		}
-		tbl.AddRow(k, values)
-	}
-	tbl.Print()
+	bw := bufio.NewWriter(c.Writer)
+	_, _ = bw.WriteString("Matches:\n")
 
-	return nil
+	if c.Bool("keys-only") {
+		for k := range requestedValues {
+			_, _ = bw.WriteString(k + "\n")
+		}
+	} else {
+		for k, v := range requestedValues {
+			_, _ = bw.WriteString(k + ": ")
+			values := make([]string, 0, len(v))
+			for item := range v {
+				values = append(values, strconv.Quote(item))
+			}
+			valuesStr := "[" + strings.Join(values, ",") + "]\n"
+			_, _ = bw.WriteString(valuesStr)
+		}
+	}
+
+	_, _ = bw.WriteString("\nPatterns:\n")
+	for _, pattern := range m.Patterns() {
+		_, _ = bw.WriteString(pattern + "\n")
+	}
+
+	return bw.Flush()
 }
 
 func viewItemsCountAction(ctx context.Context, c *cli.Command) error {