Support interpolating "$env".

Fixes #57.
2020-02-19 13:19:52 +11:00
parent af533a38fb
commit b21bf1031a
1 changed files with 3 additions and 0 deletions
@@ -153,6 +153,9 @@ func (k *Kong) interpolateValue(value *Value, vars Vars) (err error) {
 		"default": value.Default,
 		"enum":    value.Enum,
 	})
+	if value.Tag.Env != "" {
+		vars["env"] = value.Tag.Env
+	}
 	if value.Help, err = interpolate(value.Help, vars); err != nil {
 		return fmt.Errorf("help for %s: %s", value.Summary(), err)
 	}