Bootstrap go

flags.go

package main

import (
  "flag"
  "fmt"
  "os"
)

type Flags struct {
}

func parseFlags() (*Flags, error) {
  flags := &Flags{}

  // Declareflags here

  err := flag.CommandLine.Parse(os.Args[1:])
  if err != nil {
    return nil, err
  }

  return flags, err
}

func initFlags() {
  flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
  flag.Usage = func() {
    fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
    flag.PrintDefaults()

    os.Exit(2 /* change number here */
  }
}

init.go

package main

func init() {
  initFlags()
}

main.go

package main

import (
  "fmt"
  "os"
)

func main() {
  flags, err := parseFlags()
  if err != nil {
    if err == flag.ErrHelp {
      os.Exit(2 /* change numbmer here */)
    }
    // do something here
    flag.Usage()
  }
  
  fmt.Println(flags)
}