help function

envconf.go

@@ -117,6 +117,29 @@ func (c *Config) Parse() {
 	}
 }
 
+func (c *Config) Help() {
+	max := 0
+	for k, v := range c.env {
+		if v.dtype != TypeNone {
+			if len(k) > max {
+				max = len(k)
+			}
+			if len(v.dtype.String()) > max {
+				max = len(v.dtype.String())
+			}
+			if len(v.value) > max {
+				max = len(v.value)
+			}
+		}
+	}
+	for k, v := range c.env {
+		if v.dtype != TypeNone {
+			format := fmt.Sprintf("Variable %%%ds|Type %%%ds|Default %%s\n", max, max)
+			fmt.Printf(format, k, v.dtype, v.value)
+		}
+	}
+}
+
 // Status prints out failures that occured while parsing the environment to os.Stderr.
 // Variables that have been defined without a default value and are
 // missing from the environment will be considered a failure.