Add a collector generator script

tools/collector-generator/generate-collector.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"strings"
+	"text/template"
+	"unicode"
+)
+
+type TemplateData struct {
+	CollectorName string
+	Class         string
+	Members       []Member
+}
+type Member struct {
+	Name string
+	Type string
+}
+
+func main() {
+	bytes, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+	var data TemplateData
+	if err := json.Unmarshal(bytes, &data); err != nil {
+		panic(err)
+	}
+
+	funcs := template.FuncMap{
+		"toLower":     strings.ToLower,
+		"toSnakeCase": toSnakeCase,
+	}
+	template, err := template.New("template").Funcs(funcs).ParseFiles("collector.template")
+	if err != nil {
+		panic(err)
+	}
+	err = template.ExecuteTemplate(os.Stdout, "collector.template", data)
+	if err != nil {
+		panic(err)
+	}
+}
+
+// https://gist.github.com/elwinar/14e1e897fdbe4d3432e1
+func toSnakeCase(in string) string {
+	runes := []rune(in)
+	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])) {
+			out = append(out, '_')
+		}
+		out = append(out, unicode.ToLower(runes[i]))
+	}
+
+	return string(out)
+}