Update vendor (#1265)

vendor/github.com/wiggin77/merror/format.go

@@ -0,0 +1,43 @@
+package merror
+
+import (
+	"fmt"
+	"strings"
+)
+
+// FormatterFunc is a function that converts a merror
+// to a string.
+type FormatterFunc func(merr *MError) string
+
+// GlobalFormatter is the global merror formatter.
+// Set this to a custom formatter if desired.
+var GlobalFormatter = defaultFormatter
+
+// defaultFormatter
+func defaultFormatter(merr *MError) string {
+	count := 0
+	overflow := 0
+
+	var format func(sb *strings.Builder, merr *MError, indent string)
+	format = func(sb *strings.Builder, merr *MError, indent string) {
+		count += merr.Len()
+		overflow += merr.Overflow()
+
+		fmt.Fprintf(sb, "%sMError:\n", indent)
+		for _, err := range merr.Errors() {
+			if e, ok := err.(*MError); ok {
+				format(sb, e, indent+"  ")
+			} else {
+				fmt.Fprintf(sb, "%s%s\n", indent, err.Error())
+			}
+		}
+	}
+
+	sb := &strings.Builder{}
+	format(sb, merr, "")
+	fmt.Fprintf(sb, "%d errors total.\n", count)
+	if merr.overflow > 0 {
+		fmt.Fprintf(sb, "%d errors truncated.\n", overflow)
+	}
+	return sb.String()
+}