misc: small fix or general refactoring i did not bother commenting

modules/ble_unsupported.go

@@ -3,15 +3,9 @@
 package modules
 
 import (
-	"errors"
-
 	"github.com/bettercap/bettercap/session"
 )
 
-var (
-	notSupported = errors.New("ble.recon is not supported on this OS")
-)
-
 type BLERecon struct {
 	session.SessionModule
 }
@@ -35,13 +29,13 @@ func NewBLERecon(s *session.Session) *BLERecon {
 	d.AddHandler(session.NewModuleHandler("ble.recon on", "",
 		"Start Bluetooth Low Energy devices discovery.",
 		func(args []string) error {
-			return notSupported
+			return session.ErrNotSupported
 		}))
 
 	d.AddHandler(session.NewModuleHandler("ble.recon off", "",
 		"Stop Bluetooth Low Energy devices discovery.",
 		func(args []string) error {
-			return notSupported
+			return session.ErrNotSupported
 		}))
 
 	return d
@@ -60,13 +54,13 @@ func (d BLERecon) Author() string {
 }
 
 func (d *BLERecon) Configure() (err error) {
-	return notSupported
+	return session.ErrNotSupported
 }
 
 func (d *BLERecon) Start() error {
-	return notSupported
+	return session.ErrNotSupported
 }
 
 func (d *BLERecon) Stop() error {
-	return notSupported
+	return session.ErrNotSupported
 }

modules/packet_proxy_unsupported.go

@@ -8,10 +8,6 @@ import (
 	"github.com/bettercap/bettercap/session"
 )
 
-var (
-	notSupported = errors.New("packet.proxy is not supported on this OS")
-)
-
 type PacketProxy struct {
 	session.SessionModule
 }
@@ -35,13 +31,13 @@ func (pp PacketProxy) Author() string {
 }
 
 func (pp *PacketProxy) Configure() (err error) {
-	return notSupported
+	return session.ErrNotSupported
 }
 
 func (pp *PacketProxy) Start() error {
-	return notSupported
+	return session.ErrNotSupported
 }
 
 func (pp *PacketProxy) Stop() error {
-	return notSupported
+	return session.ErrNotSupported
 }

session/session.go

@@ -34,6 +34,7 @@ var (
 
 	ErrAlreadyStarted = errors.New("Module is already running.")
 	ErrAlreadyStopped = errors.New("Module is not running.")
+	ErrNotSupported   = errors.New("This component is not supported on this OS.")
 
 	reCmdSpaceCleaner = regexp.MustCompile(`^([^\s]+)\s+(.+)$`)
 )