formatter.go: Truncate function and number type names

formatter.go

@@ -11,16 +11,42 @@ type FmtOpt uint16
 const (
 	TTY FmtOpt = 1 << iota
 	MultiLine
+	Truncate
 	Base2
 	Base8
 	Base10
 	Base16
 )
 
+const (
+	TruncateEllipsis = "(...)"
+	MinTruncateSize  = 10
+	TruncateSize     = MinTruncateSize + 15
+)
+
+func TruncateString(s string) (trunc string) {
+	finalPart := len(s) - (MinTruncateSize - len(TruncateEllipsis))
+	trunc = s[0:len(s)-MinTruncateSize] + TruncateEllipsis + s[finalPart:]
+	return
+}
+
 type Formatter interface {
 	ToString(options FmtOpt) string
 }
 
+func getFormatted(v any, opt FmtOpt) (text string) {
+	if v == nil {
+		text = "(nil)"
+	} else if s, ok := v.(string); ok {
+		text = s
+	} else if formatter, ok := v.(Formatter); ok {
+		text = formatter.ToString(opt)
+	} else {
+		text = fmt.Sprintf("%v", v)
+	}
+	return
+}
+
 type Typer interface {
 	TypeName() string
 }
@@ -28,6 +54,10 @@ type Typer interface {
 func getTypeName(v any) (name string) {
 	if typer, ok := v.(Typer); ok {
 		name = typer.TypeName()
+	} else if IsInteger(v) {
+		name = "integer"
+	} else if IsFloat(v) {
+		name = "float"
 	} else {
 		name = fmt.Sprintf("%T", v)
 	}