[feat] execute protoc from stencil cli

cmd/protoc.go

@@ -0,0 +1,56 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"github.com/spf13/cobra"
+	"os/exec"
+)
+
+// ProtocCmd calls protoc
+func ProtocCmd() *cobra.Command {
+	var configFile string
+
+	cmd := &cobra.Command{
+		Use:     "protoc",
+		Aliases: []string{"p"},
+		Short:   "Execute a protoc command",
+		Example: "stencil protoc -- --descriptor_set_out \"<abs-path for op>\" --include_imports <abs-dir-path for import proto>/*.proto --proto_path \"<abs-path for ip>\"",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			app := "protoc"
+			command := exec.Command(app, args...)
+			protoPath, err := getProtoPathFromArgs(args)
+			if err != nil {
+				return err
+			}
+			//execute the protoc command in specified proto_path
+			if protoPath != "" {
+				command.Dir = protoPath
+			}
+			stdout, err := command.Output()
+			if err != nil {
+				fmt.Println(err.Error())
+				return err
+			}
+
+			fmt.Println(string(stdout))
+			fmt.Println("Successfully executed Protoc operation.")
+			return nil
+		},
+	}
+
+	cmd.Flags().StringVarP(&configFile, "config", "c", "./config.yaml", "Config file path")
+	return cmd
+}
+
+func getProtoPathFromArgs(args []string) (string, error) {
+	for i, arg := range args {
+		if arg == "--proto_path" {
+			if i+1 == len(args) {
+				return "", errors.New("--proto_path value not provided")
+			}
+			return args[i+1], nil
+		}
+	}
+	return "", nil
+}

cmd/root.go

@@ -26,6 +26,7 @@ func New() *cobra.Command {
 			$ stencil download 
 			$ stencil snapshot list
 			$ stencil serve
+			$ stencil protoc
 		`),
 		Annotations: map[string]string{
 			"group:core": "true",
@@ -42,5 +43,6 @@ func New() *cobra.Command {
 	cmd.AddCommand(MigrateCmd())
 	cmd.AddCommand(DownloadCmd())
 	cmd.AddCommand(Snapshot())
+	cmd.AddCommand(ProtocCmd())
 	return cmd
 }