advStringOps.go

package main

import "strings"

func rightPad2Len(s string, padStr string, overallLen int) string {
	var padCountInt int
	padCountInt = 1 + ((overallLen - len(padStr)) / len(padStr))
	var retStr = s + strings.Repeat(padStr, padCountInt)
	return retStr[:overallLen]
}
func leftPad2Len(s string, padStr string, overallLen int) string {
	var padCountInt int
	padCountInt = 1 + ((overallLen - len(padStr)) / len(padStr))
	var retStr = strings.Repeat(padStr, padCountInt) + s
	return retStr[(len(retStr) - overallLen):]
}

func wordWrap(text string, lineWidth int) string {
	words := strings.Fields(strings.TrimSpace(text))
	if len(words) == 0 {
		return text
	}
	wrapped := words[0]
	spaceLeft := lineWidth - len(wrapped)
	for _, word := range words[1:] {
		if len(word)+1 > spaceLeft {
			wrapped += "\n" + word
			spaceLeft = lineWidth - len(word)
		} else {
			wrapped += " " + word
			spaceLeft -= 1 + len(word)
		}
	}

	return wrapped

}