simple-go-action/main.go

package main

import (
	"fmt"
	"os"
	"time"
)

func main() {
	username := readInputs()
	fmt.Printf("username is %s\n", username)

	err := writeOutputs("time", time.Now().Format("2006-01-02 15:04:05"))
	if err != nil {
		panic(err)
	}
}

func readInputs() string {
	username := os.Getenv("INPUT_USERNAME")
	return username
}

func writeOutputs(k, v string) (err error) {
	msg := fmt.Sprintf("%s=%s", k, v)
	outputFilepath := os.Getenv("GITHUB_OUTPUT")
	f, err := os.OpenFile(outputFilepath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		return
	}
	defer func() {
		if cErr := f.Close(); cErr != nil && err == nil {
			err = cErr
		}
	}()
	if _, err = f.Write([]byte(msg)); err != nil {
		return
	}
	return
}