wrap.go

package main

import (
	"bytes"
	"strings"
	"unicode"
)

// Modified from github.com/mitchellh/go-wordwrap
func wrapString(s string, lim uint, indent int) string {
	// Initialize a buffer with a slightly larger size to account for breaks
	init := make([]byte, 0, len(s))
	buf := bytes.NewBuffer(init)

	var current uint
	var wordBuf, spaceBuf bytes.Buffer

	for _, char := range s {
		if char == '\n' {
			if wordBuf.Len() == 0 {
				if current+uint(spaceBuf.Len()) > lim {
					current = 0
				} else {
					current += uint(spaceBuf.Len())
					spaceBuf.WriteTo(buf)
				}
				spaceBuf.Reset()
			} else {
				current += uint(spaceBuf.Len() + wordBuf.Len())
				spaceBuf.WriteTo(buf)
				spaceBuf.Reset()
				wordBuf.WriteTo(buf)
				wordBuf.Reset()
			}
			buf.WriteRune(char)
			current = 0
		} else if unicode.IsSpace(char) {
			if spaceBuf.Len() == 0 || wordBuf.Len() > 0 {
				current += uint(spaceBuf.Len() + wordBuf.Len())
				spaceBuf.WriteTo(buf)
				spaceBuf.Reset()
				wordBuf.WriteTo(buf)
				wordBuf.Reset()
			}

			spaceBuf.WriteRune(char)
		} else {

			wordBuf.WriteRune(char)

			if current+uint(spaceBuf.Len()+wordBuf.Len()) > lim && uint(wordBuf.Len()) < lim {
				buf.WriteRune('\n')
				current = 0
				spaceBuf.Reset()
			}
		}
	}

	if wordBuf.Len() == 0 {
		if current+uint(spaceBuf.Len()) <= lim {
			spaceBuf.WriteTo(buf)
		}
	} else {
		spaceBuf.WriteTo(buf)
		wordBuf.WriteTo(buf)
	}

	intentStr := "\n"
	intentStr += strings.Repeat(" ", indent)
	return strings.Replace(buf.String(), "\n", intentStr, -1)
}