resizer.go

func GetResizedImages(configuration configs.Configuration, sourceImagePath string) []string {
	var resizedImagePaths []string

	for _, imageSize := range configuration.ImageSizes {
		resizedImagePath := resize(configuration, imageSize, sourceImagePath)
		resizedImagePaths = append(resizedImagePaths, resizedImagePath)
	}

	return resizedImagePaths
}

// resizeImage resizes the image and returns path
func resize(configuration configs.Configuration, imageSize configs.ImageSize, sourceImagePath string) string {

	sourceImage, err := imaging.Open(sourceImagePath)

	if err != nil {
		log.Fatalf("failed to open image: %v", err)
	}

	var resizedImage *image.NRGBA
	if configuration.IsSaveWithAspectRatio {
		resizedImage = imaging.Resize(sourceImage, imageSize.Width, 0, imaging.Lanczos)
	} else {
		resizedImage = imaging.Resize(sourceImage, imageSize.Width, imageSize.Height, imaging.Lanczos)
	}

	resizedImageName := getResizedImageName(configuration, imageSize, sourceImagePath)
	imagePath := configuration.LocalImageDirectory + "/" + resizedImageName
	err = imaging.Save(resizedImage, imagePath)
	if err != nil {
		log.Fatalf("resized image is not saved, %v", err)
	}

	return resizedImageName
}