format

type Formatter struct {
	// ShowUnexported bool   // display unexported fields
	ShowZero    bool   // display struct fields that have their zero value
	MaxWidth    int    // maximum columns, but not breaking words
	Compact     bool   // as few lines as possible, observing MaxWidth
	Indent      string // ignored if Compact; default is 4 spaces
	MaxDepth    int    // max recursion depth; default is 100
	MaxElements int    // max array, slice or map elements to print
	OmitPackage bool   // don't print package in type names
	// contains filtered or unexported fields
}