lang: types: Add simple parsing of net.HardwareAddr

If we want to use special struct types from our CLI parser, we also need
to be able to both identify, and convert them to our language type and
value representations.

For as long as we don't have fancier types in our language, these should
both be strings. Tests and extensions to these additions are welcome!

lang/types/type.go

@@ -31,6 +31,7 @@ package types
 
 import (
 	"fmt"
+	"net"
 	"reflect"
 	"strings"
 
@@ -184,6 +185,14 @@ func ConfigurableTypeOf(t reflect.Type, opts ...TypeOfOption) (*Type, error) {
 		kind = typ.Kind()
 	}
 
+	// Special cases:
+	if reflect.TypeOf(net.HardwareAddr{}) == typ {
+		return &Type{
+			Kind: KindStr,
+		}, nil
+	}
+	// TODO: net/url.URL, time.Duration, etc. Note: avoid net/mail.Address
+
 	switch kind { // match on destination field kind
 	case reflect.Bool:
 		return &Type{

lang/types/value.go

@@ -32,6 +32,7 @@ package types
 import (
 	"errors"
 	"fmt"
+	"net"
 	"reflect"
 	"sort"
 	"strconv"
@@ -111,6 +112,14 @@ func ValueOf(v reflect.Value) (Value, error) {
 		value = value.Elem() // XXX: is this correct?
 	}
 
+	// Special cases:
+	if value.CanInterface() {
+		if v, ok := (value.Interface()).(net.HardwareAddr); ok {
+			return &StrValue{V: v.String()}, nil
+		}
+	}
+	// TODO: net/url.URL, time.Duration, etc. Note: avoid net/mail.Address
+
 	switch kind { // match on destination field kind
 	case reflect.Bool:
 		return &BoolValue{V: value.Bool()}, nil