feat(templater): Implement unit formats

services/templater.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/base64"
 	"errors"
+	"fmt"
 	"html/template"
 	"image/png"
 
@@ -89,10 +90,22 @@ func (t *DefaultTemplater) SelectSponsorImage(id int) (string, error) {
 	return templates.GetImage(sponsors[id%len(sponsors)]), nil
 }
 
+func FormatUnit(unit string, amount int) (string, error) {
+	switch unit {
+	case "kilometer":
+		return fmt.Sprintf("%.3f", float64(amount)/1000), nil
+	case "euro":
+		return fmt.Sprintf("%.2f", float64(amount)/100), nil
+	default:
+		return "", errors.New("unknown unit")
+	}
+}
+
 func (t *DefaultTemplater) StringToTemplate(templateString string) (*template.Template, error) {
 	return template.New("template").Funcs(template.FuncMap{
 		"barcode":     t.GenerateBarcode,
 		"sponsorLogo": t.SelectSponsorImage,
+		"formatUnit":  FormatUnit,
 	}).Parse(templateString)
 }