main.go

package main

import (
	"errors"
	"log"
	"os"

	"github.com/flashbots/go-template/common"
	"github.com/urfave/cli/v2" // imports as package "cli"
)

var flags []cli.Flag = []cli.Flag{
	&cli.BoolFlag{
		Name:  "log-json",
		Value: false,
		Usage: "log in JSON format",
	},
	&cli.BoolFlag{
		Name:  "log-debug",
		Value: false,
		Usage: "log debug messages",
	},
}

func main() {
	app := &cli.App{
		Name:        "cli",
		Usage:       "command-line interface for your project",
		Version:     common.Version,
		HideVersion: false,
		Flags:       flags,
		Action:      runCli,
	}

	if err := app.Run(os.Args); err != nil {
		log.Fatal(err)
	}
}

func runCli(cCtx *cli.Context) error {
	logJSON := cCtx.Bool("log-json")
	logDebug := cCtx.Bool("log-debug")

	log := common.SetupLogger(&common.LoggingOpts{
		Debug:   logDebug,
		JSON:    logJSON,
		Version: common.Version,
	})

	log.Info("Starting the project")

	log.Debug("debug message")
	log.Info("info message")
	log.With("key", "value").Warn("warn message")
	log.Error("error message", "err", errors.ErrUnsupported)

	return nil
}