pop/main.go

package main

import (
	"fmt"
	"io"
	"os"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/resendlabs/resend-go"
	"github.com/spf13/cobra"
)

const RESEND_API_KEY = "RESEND_API_KEY"
const RESEND_FROM = "RESEND_FROM"

var (
	from        string
	to          []string
	subject     string
	body        string
	attachments []string
)

var rootCmd = &cobra.Command{
	Use:   "email",
	Short: "email is a command line interface for sending emails.",
	Long:  `email is a command line interface for sending emails.`,
	RunE: func(cmd *cobra.Command, args []string) error {
		if hasStdin() {
			b, err := io.ReadAll(os.Stdin)
			if err != nil {
				return err
			}
			body = string(b)
		}

		if len(to) > 0 && from != "" && subject != "" && body != "" {
			err := sendEmail(to, from, subject, body, attachments)
			if err != nil {
				cmd.SilenceUsage = true
				cmd.SilenceErrors = true
				fmt.Println(errorStyle.Render(err.Error()))
				return err
			}
			return nil
		}

		p := tea.NewProgram(NewModel(resend.SendEmailRequest{
			From:    from,
			To:      to,
			Subject: subject,
			Text:    body,
		}))
		_, err := p.Run()
		if err != nil {
			return err
		}
		return nil
	},
}

// hasStdin returns whether there is data in stdin.
func hasStdin() bool {
	stat, err := os.Stdin.Stat()
	return err == nil && (stat.Mode()&os.ModeCharDevice) == 0
}

func init() {
	rootCmd.Flags().StringSliceVar(&to, "bcc", []string{}, "Blind carbon copy recipients")
	rootCmd.Flags().StringSliceVar(&to, "cc", []string{}, "Carbon copy recipients")
	rootCmd.Flags().StringSliceVarP(&attachments, "attach", "a", []string{}, "Email's attachments")
	rootCmd.Flags().StringSliceVarP(&to, "to", "t", []string{}, "Recipient emails")
	rootCmd.Flags().StringVarP(&body, "body", "b", "", "Email's body (markdown)")
	rootCmd.Flags().StringVarP(&from, "from", "f", os.Getenv(RESEND_FROM), "Email's sender ($RESEND_FROM)")
	rootCmd.Flags().StringVarP(&subject, "subject", "s", "", "Email's subject")
}

func main() {
	key := os.Getenv(RESEND_API_KEY)
	if key == "" {
		fmt.Printf("\n  %s %s %s\n\n", errorHeaderStyle.String(), inlineCodeStyle.Render(RESEND_API_KEY), "environment variable is required.")
		fmt.Printf("  %s %s\n\n", commentStyle.Render("You can grab one at"), linkStyle.Render("https://resend.com"))
		os.Exit(1)
	}

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