feature: allow list/export/sort/distict metadata

pkg/util/stringutils2/ignorecase.go

@@ -0,0 +1,33 @@
+// Copyright 2019 Yunion
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package stringutils2
+
+import (
+	"strings"
+)
+
+func HasSuffixIgnoreCase(str string, suffix string) bool {
+	if len(str) < len(suffix) {
+		return false
+	}
+	return strings.EqualFold(str[len(str)-len(suffix):len(str)], suffix)
+}
+
+func HasPrefixIgnoreCase(str string, prefix string) bool {
+	if len(str) < len(prefix) {
+		return false
+	}
+	return strings.EqualFold(str[0:len(prefix)], prefix)
+}

pkg/util/stringutils2/ignorecase_test.go

@@ -0,0 +1,81 @@
+// Copyright 2019 Yunion
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package stringutils2
+
+import (
+	"testing"
+)
+
+func TestHasSufffixIgnoreCase(t *testing.T) {
+	cases := []struct {
+		Hystack string
+		Needle  string
+		Want    bool
+	}{
+		{
+			Hystack: "Hyperscacle:ASC",
+			Needle:  ":ASC",
+			Want:    true,
+		},
+		{
+			Hystack: "Hyperscacle:ASC",
+			Needle:  ":asc",
+			Want:    true,
+		},
+		{
+			Hystack: "Hyperscacle:ASC",
+			Needle:  "ASCD",
+			Want:    false,
+		},
+	}
+
+	for _, c := range cases {
+		got := HasSuffixIgnoreCase(c.Hystack, c.Needle)
+		if got != c.Want {
+			t.Errorf("HasSuffixIgnoreCase %s %s want %v got %v", c.Hystack, c.Needle, c.Want, got)
+		}
+	}
+}
+
+func TestHasPrefixIgnoreCase(t *testing.T) {
+	cases := []struct {
+		Hystack string
+		Needle  string
+		Want    bool
+	}{
+		{
+			Hystack: "Hyperscacle:ASC",
+			Needle:  "Hyper",
+			Want:    true,
+		},
+		{
+			Hystack: "Hyperscacle:ASC",
+			Needle:  "HYPER",
+			Want:    true,
+		},
+		{
+			Hystack: "Hyperscacle:ASC",
+			Needle:  "ASCD",
+			Want:    false,
+		},
+	}
+
+	for _, c := range cases {
+		got := HasPrefixIgnoreCase(c.Hystack, c.Needle)
+		if got != c.Want {
+			t.Errorf("HasPrefixIgnoreCase %s %s want %v got %v", c.Hystack, c.Needle, c.Want, got)
+		}
+	}
+}

pkg/util/stringutils2/sortedstrings.go

@@ -22,7 +22,7 @@ type SSortedStrings []string
 
 func NewSortedStrings(strs []string) SSortedStrings {
 	if strs == nil {
-		return nil
+		return SSortedStrings{}
 	}
 	sort.Strings(strs)
 	return SSortedStrings(strs)