IntSliceFlag.ValueFromContext() as convenient accessor

flag_int_slice.go

@@ -185,6 +185,11 @@ func (f *IntSliceFlag) Apply(set *flag.FlagSet) error {
 	return nil
 }
 
+// ValueFromContext returns the flag’s value in the given Context.
+func (f *IntSliceFlag) ValueFromContext(ctx *Context) []int {
+	return ctx.IntSlice(f.Name)
+}
+
 // IntSlice looks up the value of a local IntSliceFlag, returns
 // nil if not found
 func (c *Context) IntSlice(name string) []int {

flag_test.go

@@ -939,6 +939,14 @@ func TestIntSliceFlag_SetFromParentContext(t *testing.T) {
 	}
 }
 
+func TestIntSliceFlagValueFromContext(t *testing.T) {
+	set := flag.NewFlagSet("test", 0)
+	set.Var(NewIntSlice(1, 2, 3), "myflag", "doc")
+	ctx := NewContext(nil, set, nil)
+	f := &IntSliceFlag{Name: "myflag"}
+	expect(t, f.ValueFromContext(ctx), []int{1, 2, 3})
+}
+
 var int64SliceFlagTests = []struct {
 	name     string
 	aliases  []string