fix(context): copy StringSlice Flag correctly

context.go

@@ -197,6 +197,7 @@ func lookupBool(name string, set *flag.FlagSet) bool {
 	return false
 }
 
+
 func lookupBoolT(name string, set *flag.FlagSet) bool {
 	f := set.Lookup(name)
 	if f != nil {
@@ -210,6 +211,14 @@ func lookupBoolT(name string, set *flag.FlagSet) bool {
 	return false
 }
 
+func copyFlag(name string, ff *flag.Flag, set *flag.FlagSet) {
+	switch ff.Value.(type) {
+	case *StringSlice:
+	default:
+		set.Set(name, ff.Value.String())
+	}
+}
+
 func normalizeFlags(flags []Flag, set *flag.FlagSet) error {
 	visited := make(map[string]bool)
 	set.Visit(func(f *flag.Flag) {
@@ -235,7 +244,9 @@ func normalizeFlags(flags []Flag, set *flag.FlagSet) error {
 		}
 		for _, name := range parts {
 			name = strings.Trim(name, " ")
-			set.Set(name, ff.Value.String())
+			if !visited[name] {
+				copyFlag(name, ff, set)
+			}
 		}
 	}
 	return nil

flag_test.go

@@ -2,6 +2,7 @@ package cli_test
 
 import (
 	"github.com/codegangsta/cli"
+	"reflect"
 	"testing"
 )
 
@@ -101,6 +102,22 @@ func TestParseMultiString(t *testing.T) {
 	}).Run([]string{"run", "-s", "10"})
 }
 
+func TestParseMultiStringSlice(t *testing.T) {
+	(&cli.App{
+		Flags: []cli.Flag{
+			cli.StringSliceFlag{Name: "serve, s", Value: &cli.StringSlice{}},
+		},
+		Action: func(ctx *cli.Context) {
+			if !reflect.DeepEqual(ctx.StringSlice("serve"), []string{"10", "20"}) {
+				t.Errorf("main name not set")
+			}
+			if !reflect.DeepEqual(ctx.StringSlice("s"), []string{"10", "20"}) {
+				t.Errorf("short name not set")
+			}
+		},
+	}).Run([]string{"run", "-s", "10", "-s", "20"})
+}
+
 func TestParseMultiInt(t *testing.T) {
 	a := cli.App{
 		Flags: []cli.Flag{