epuppy/cmd/io.go

/*
Copyright © 2026 Thomas von Dein

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cmd

import (
	"fmt"
	"log"
	"os"
)

func FileExists(filename string) bool {
	info, err := os.Stat(filename)

	if err != nil {
		// return false on any error
		return false
	}

	return !info.IsDir()
}

func WriteFile(filename string, content []byte) error {
	var err error

	fd, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
	if err != nil {
		return fmt.Errorf("failed to open file %s for writing: %w", filename, err)
	}
	defer func() {
		if err := fd.Close(); err != nil {
			log.Fatal(err)
		}
	}()

	_, err = fd.Write(content)

	return err
}