package chart import ( "fmt" "time" "github.com/blendlabs/go-util" ) // ValueFormatter is a function that takes a value and produces a string. type ValueFormatter func(v interface{}) string // TimeValueFormatter is a ValueFormatter for timestamps. func TimeValueFormatter(v interface{}) string { return TimeValueFormatterWithFormat(v, DefaultDateFormat) } // TimeValueFormatterWithFormat is a ValueFormatter for timestamps with a given format. func TimeValueFormatterWithFormat(v interface{}, dateFormat string) string { if typed, isTyped := v.(time.Time); isTyped { return typed.Format(dateFormat) } if typed, isTyped := v.(int64); isTyped { return time.Unix(typed, 0).Format(dateFormat) } if typed, isTyped := v.(float64); isTyped { return time.Unix(int64(typed), 0).Format(dateFormat) } return util.StringEmpty } // FloatValueFormatter is a ValueFormatter for float64. func FloatValueFormatter(v interface{}) string { return FloatValueFormatterWithFormat(v, "%.2f") } // FloatValueFormatterWithFormat is a ValueFormatter for float64 with a given format. func FloatValueFormatterWithFormat(v interface{}, floatFormat string) string { if typed, isTyped := v.(float64); isTyped { return fmt.Sprintf(floatFormat, typed) } return util.StringEmpty }