source: code/trunk/vendor/github.com/dustin/go-humanize/ftoa.go@ 822

package humanize

import (
        "strconv"
        "strings"
)

func stripTrailingZeros(s string) string {
        offset := len(s) - 1
        for offset > 0 {
                if s[offset] == '.' {
                        offset--
                        break
                }
                if s[offset] != '0' {
                        break
                }
                offset--
        }
        return s[:offset+1]
}

func stripTrailingDigits(s string, digits int) string {
        if i := strings.Index(s, "."); i >= 0 {
                if digits <= 0 {
                        return s[:i]
                }
                i++
                if i+digits >= len(s) {
                        return s
                }
                return s[:i+digits]
        }
        return s
}

// Ftoa converts a float to a string with no trailing zeros.
func Ftoa(num float64) string {
        return stripTrailingZeros(strconv.FormatFloat(num, 'f', 6, 64))
}

// FtoaWithDigits converts a float to a string but limits the resulting string
// to the given number of decimal places, and no trailing zeros.
func FtoaWithDigits(num float64, digits int) string {
        return stripTrailingZeros(stripTrailingDigits(strconv.FormatFloat(num, 'f', 6, 64), digits))
}