proto/cmd/root.go

package cmd

import (
	"flag"
	"fmt"
	"log"
	"os"

	"jxs.me/proto/mps"
)

func Root() error {
	args := flag.NewFlagSet("root", flag.ExitOnError)
	args.Parse(os.Args[1:])

	source := args.Arg(0)
	if source == "" {
		return fmt.Errorf("File is required")
	}

	sourceFile, err := os.Open(source)
	if err != nil {
		return err
	}
	defer sourceFile.Close()
	tx, err := mps.Parse(sourceFile)

	log.Printf("Parsed %d records", tx.Header.RecordCount)

	return err
}