Add SnakeCase

strmangle/strmangle.go

@@ -9,6 +9,7 @@ import (
 	"math"
 	"regexp"
 	"strings"
+	"unicode"
 
 	"github.com/jinzhu/inflection"
 )
@@ -138,6 +139,22 @@ func CamelCase(name string) string {
 	return strings.Join(splits, "")
 }
 
+// SnakeCase converts TitleCase variable names to snake_case format.
+func SnakeCase(name string) string {
+	runes := []rune(name)
+	length := len(runes)
+
+	var out []rune
+	for i := 0; i < length; i++ {
+		if i > 0 && unicode.IsUpper(runes[i]) && ((i+1 < length && unicode.IsLower(runes[i+1])) || unicode.IsLower(runes[i-1]) || unicode.IsDigit(runes[i-1])) {
+			out = append(out, '_')
+		}
+		out = append(out, unicode.ToLower(runes[i]))
+	}
+
+	return string(out)
+}
+
 // MakeStringMap converts a map[string]string into the format:
 // "key": "value", "key": "value"
 func MakeStringMap(types map[string]string) string {