snaker.go

package main

import (
    "strings"
    "unicode"
)

// CamelToSnake converts a given string to snake case
func CamelToSnake(s string) string {
    result := ""
    words := make([]string, 0)
    lastPos := 0
    rs := []rune(s)

    for i := 0; i < len(rs); i++ {
        if i > 0 && unicode.IsUpper(rs[i]) {
            words = append(words, s[lastPos:i])
            lastPos = i
        }
    }

    // append the last word
    if s[lastPos:] != "" {
        words = append(words, s[lastPos:])
    }

    for k, word := range words {
        if k > 0 {
            result += "_"
        }

        result += strings.ToLower(word)
    }

    return result
}