format and center align text

gistfile1.txt

package main

import (
    "fmt"
    "strings"
)

func cutncenter(text string, ncol int) string {
    
    align := func (linewords []string, ncol int) string {
    
        length := 0

        for _,w := range(linewords) {
            length = length + len(w)
        }

        var inc float64 = 0.0

        if len(linewords) > 1 {
            inc = float64(ncol-length+0.0) / float64(len(linewords)-1)        
        }

        line := linewords[0]

        for i:=1;i<len(linewords);i++ { 
            
            diff := int(float64(i)*inc)-int(float64(i-1)*inc)
            
            space := strings.Repeat(" ",int(diff)) 
            line = line + space + linewords[i]
        }

        return line
    }
    
    ret := ""
    
    words := strings.Split(text," ")    
    length := 0
    linewords := []string{}    
    
    for _,word := range(words) {
        
        if len(words) > 0 {
           length++
        }
        
        linewords = append(linewords,word)
        length += len(word)
        
        if length>ncol {                        
            ret += align(linewords[:len(linewords)-1],ncol)+"\n"
            length = len(word)
            linewords = []string{word}
        }        
    }
   
    ret += align(linewords,ncol) 
    return ret
}


func main() {
    text := "Lorem Ipsum xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx es es simplementeel texto de relleno de las imprentas y archivos de texto. Lorem Ipsum ha sido el texto de relleno estandar"   
    fmt.Println(strings.Repeat("-",30))    
    fmt.Println(cutncenter(text,30))

}