feat: convert markdown to html

main.go

@@ -2,20 +2,52 @@ 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 {
-		p := tea.NewProgram(NewModel())
+		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 {
+				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
@@ -24,6 +56,22 @@ var rootCmd = &cobra.Command{
 	},
 }
 
+// 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 == "" {