implement del command

Author: Dylan Clendenin

README.md

@@ -46,3 +46,11 @@ can be performed in a single transaction)
 ```
 kv set --prefix env/myapp/stage YO=123 THING_TOKEN=xcnvbxcmhdf COOL_FACTOR=9000
 ```
+
+### del
+
+delete provided key(s) at a given prefix (*NOTE:* in Consul 0.7 this
+can be performed in a single transaction)
+```
+kv del --prefix env/myapp/stage YO THING_TOKEN COOL_FACTOR
+```

cmd/del.go

@@ -0,0 +1,64 @@
+// Copyright © 2016 NAME HERE <EMAIL ADDRESS>
+//
+// 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 cmd
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/deepthawtz/kv/store"
+	consul "github.com/hashicorp/consul/api"
+	"github.com/spf13/cobra"
+)
+
+// delCmd represents the del command
+var delCmd = &cobra.Command{
+	Use:   "del KEY [KEY...]",
+	Short: "delete key from prefix (e.g., env/myapp/stage)",
+	Long:  "",
+	Run:   Del,
+}
+
+func init() {
+	RootCmd.AddCommand(delCmd)
+
+	delCmd.Flags().StringVarP(&prefix, "prefix", "p", "", "prefix to get key/value pairs from")
+}
+
+// Del deletes key/value pairs by key
+func Del(cmd *cobra.Command, args []string) {
+	if prefix == "" {
+		fmt.Println("must supply key/value path --prefix")
+		os.Exit(-1)
+	}
+
+	client := store.NewConsulClient()
+	if err := del(client, args...); err != nil {
+		fmt.Println(err)
+		os.Exit(-1)
+	}
+}
+
+func del(client *consul.KV, args ...string) error {
+	for _, k := range args {
+		key := strings.Join([]string{prefix, k}, "/")
+		_, err := client.Delete(key, nil)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}

cmd/del_test.go

@@ -0,0 +1,27 @@
+package cmd
+
+import (
+	"strings"
+	"testing"
+
+	consul "github.com/hashicorp/consul/api"
+)
+
+func TestDel(t *testing.T) {
+	c, s := makeClient(t)
+	defer s.Stop()
+	kv := c.KV()
+
+	prefix = "env/yo/stage"
+	k := strings.Join([]string{prefix, "YO"}, "/")
+	_, _ = kv.Put(&consul.KVPair{Key: k, Value: []byte("123")}, nil)
+
+	if err := del(kv, []string{"YO"}...); err != nil {
+		t.Error("expected del to return true but got false")
+	}
+
+	kvs, _ := get(kv, []string{"YO"}...)
+	if len(kvs) != 0 {
+		t.Error("expected key to be deleted")
+	}
+}