Add new StringSlice flag type

Arguments passed on the command line will be split on "," and will be
stored in a slice.

We can see this already exits in codegangsta/cli
https://github.com/codegangsta/cli/blob/44d40054fa6208a3013d7217aca72a2b8b0f5a0b/flag.go#L102

And people have written their own implementations for cobra/pflag
https://github.com/GoogleCloudPlatform/kubernetes/blob/c5ba95ee26cbec9694a780544b559a797956ea54/pkg/util/list.go

Lets just make it a first class flag

1 files changed, 34 insertions, 0 deletions

diff --git a/string_slice_test.go b/string_slice_test.go
new file mode 100644
index 0000000..019afee
--- /dev/null
+++ b/string_slice_test.go
@@ -0,0 +1,34 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pflag
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+)
+
+func setUpSSFlagSet(ssp *[]string) *FlagSet {
+	f := NewFlagSet("test", ContinueOnError)
+	f.StringSliceVar(ssp, "ss", []string{}, "Command seperated list!")
+	return f
+}
+
+func TestSS(t *testing.T) {
+	var ss []string
+	f := setUpSSFlagSet(&ss)
+
+	vals := []string{"one", "two", "4", "3"}
+	arg := fmt.Sprintf("--ss=%s", strings.Join(vals, ","))
+	err := f.Parse([]string{arg})
+	if err != nil {
+		t.Fatal("expected no error; got", err)
+	}
+	for i, v := range ss {
+		if vals[i] != v {
+			t.Fatal("expected ss[%d] to be %s but got: %s", i, vals[i], v)
+		}
+	}
+}