Read CSV From Go

read_csv.go

package main

import (
	"fmt"
	"os"

	"github.com/gocarina/gocsv"
)

/* users.csv
ID,first_name,last_name,email
1,manjunath,desappa,[email protected]
2,rob,langdon,[email protected]
*/

type User struct {
	ID        string `csv:"ID"`
	FirstName string `csv:"first_name"`
	LastName  string `csv:"last_name"`
	Email     string `csv:"email"`
	NotUsed   string `csv:"-"`
}

func ReadUsersFromCSV(filePath string) []*User {

	userFile, err := os.OpenFile(filePath, os.O_RDWR, os.ModePerm)
	if err != nil {
		panic(err)
	}
	defer userFile.Close()

	usersList := []*User{}

	if err := gocsv.Unmarshal(userFile, &usersList); err != nil {
		panic(err)
	}

	for _, userData := range usersList {
		fmt.Printf("$%v\n", userData)
	}

	return usersList
}

func printHelper() {
	fmt.Println(`Usage: tcompare <user summary> <user transcript>`)
}

func main() {
	args := os.Args[1:]
	if args[0] == "--help" {
		printHelper()
		return
	}
	users := ReadUsersFromCSV(args[0])

	fmt.Println("Found:", len(users))
}