toolbox: add expanddir command

cmd/toolbox/cmd/expanddir.go

@@ -0,0 +1,47 @@
+// Copyright 2019 Sorint.lab
+//
+// 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 (
+	"io"
+	"log"
+	"os"
+
+	"github.com/mitchellh/go-homedir"
+	"github.com/spf13/cobra"
+)
+
+var cmdExpandDir = &cobra.Command{
+	Use:   "expanddir",
+	Run:   expanddirRun,
+	Short: "create the provided directories",
+}
+
+func init() {
+	CmdToolbox.AddCommand(cmdExpandDir)
+}
+
+func expanddirRun(cmd *cobra.Command, args []string) {
+	if len(args) == 0 {
+		log.Fatalf("no directory name specified")
+	}
+
+	expDir, err := homedir.Expand(args[0])
+	if err != nil {
+		log.Fatalf("failed to expand dir %q: %v", expDir, err)
+	}
+
+	io.WriteString(os.Stdout, expDir)
+}