add template list command

Author: stuartleeks

cmd/devcontainer/main.go

@@ -10,6 +10,7 @@ func main() {
 
 	rootCmd.AddCommand(createListCommand())
 	rootCmd.AddCommand(createExecCommand())
+	rootCmd.AddCommand(createTemplateCommand())
 	rootCmd.AddCommand(createCompleteCommand(rootCmd))
 
 	rootCmd.Execute()

cmd/devcontainer/template.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+func createTemplateCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "template",
+		Short: "work with templates",
+		Long:  "Use subcommands to work with devcontainer templates",
+	}
+	cmd.AddCommand(createTemplateListCommand())
+	return cmd
+}
+
+func createTemplateListCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "list",
+		Short: "list templates",
+		Long:  "List devcontainer templates",
+		Run: func(cmd *cobra.Command, args []string) {
+			const containerFolder string = "$HOME/source/vscode-dev-containers/containers" // TODO - make configurable!
+
+			folder := os.ExpandEnv(containerFolder)
+			c, err := ioutil.ReadDir(folder)
+			if err != nil {
+				fmt.Printf("Error reading devcontainer definitions: %s\n", err)
+				os.Exit(1)
+			}
+
+			fmt.Println("Listing subdir/parent")
+			for _, entry := range c {
+				if entry.IsDir() {
+					fmt.Println(entry.Name())
+				}
+			}
+
+		},
+	}
+	return cmd
+}