cobra.go

package main

import (
	"fmt"
	"os"
	"path"
	"path/filepath"

	"github.com/spf13/cobra"
)

type config struct {
	buildFile string
	name      string
	level     int
}

func preRun(cmd *cobra.Command, args []string, cfg *config) error {
	buildFile, _ := cmd.Flags().GetString("build-file")
	fmt.Printf("Read build-file %s and populate config here\n", buildFile)
	cfg.buildFile = buildFile
	cfg.name = "bob"
	cfg.level = 3
	return nil
}

func buildCmd(cfg *config) *cobra.Command {
	cmd := &cobra.Command{ // nolint:exhaustivestruct
		Use:   "build",
		Short: "builds service binaries",
		Long:  "",
		Run: func(cmd *cobra.Command, args []string) {
			runBuild(cmd, args, cfg)
		},
	}

	return cmd
}

func runBuild(cmd *cobra.Command, args []string, cfg *config) {
	fmt.Printf("do build: %+v\n", cfg)
}

func main() {
	name := filepath.Base(os.Args[0])
	var cfg config

	rootCmd := &cobra.Command{ // nolint:exhaustivestruct
		Use:   name,
		Short: "builder of blobs",
		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
			return preRun(cmd, args, &cfg)
		},
	}

	rootCmd.PersistentFlags().StringP("build-file", "f", path.Join(
		func() string {
			s, _ := os.Getwd()

			return s
		}(), "bob.yaml"),
		"build file (default: $PWD/bob.yaml)")

	// Add all the sub-commands
	rootCmd.AddCommand(buildCmd(&cfg))

	if err := rootCmd.Execute(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}