refactor

internal/ascii_art/ascii_art.go

@@ -16,7 +16,7 @@ func selectRandomly(chars string) string {
 	return string(chars[r])
 }
 
-// Generate generates an ASCII art from an image.
+// `Generate` generates an ASCII art from an image.
 func Generate(dest image.Image, threshold int) string {
 	srcBounds := dest.Bounds()
 

internal/img/img.go

@@ -9,7 +9,7 @@ import (
 	"golang.org/x/image/draw"
 )
 
-// Load loads an image from a file.
+// `Load` loads an image from a file.
 func Load(path string) (image.Image, error) {
 	file, err := os.Open(path)
 	if err != nil {
@@ -25,7 +25,7 @@ func Load(path string) (image.Image, error) {
 	return img, nil
 }
 
-// Resize resizes an image to a given width and height.
+// `Resize` resizes an image to a given width and height.
 func Resize(img image.Image, magnification float64) *image.RGBA {
 	rect := img.Bounds()
 
@@ -48,7 +48,7 @@ func Resize(img image.Image, magnification float64) *image.RGBA {
 	return dest
 }
 
-// UnSync unsynchronizes an image file.
+// `UnSync` unsynchronizes an image file.
 func UnSync(dest image.Image) error {
 	tmp, err := os.Create("tmp.png")
 	if err != nil {

main.go

@@ -10,6 +10,11 @@ import (
 	"github.com/urfave/cli/v2"
 )
 
+const (
+	DefaultThreshold     = 128
+	DefaultMagnification = 1.0
+)
+
 type Inputs struct {
 	path          string
 	threshold     int
@@ -25,14 +30,14 @@ func main() {
 				Name:        "threshold",
 				Aliases:     []string{"t"},
 				Usage:       "the threshold for ASCII Art Generation",
-				Value:       128,
+				Value:       DefaultThreshold,
 				Destination: &inputs.threshold,
 			},
 			&cli.Float64Flag{
 				Name:        "magnification",
 				Aliases:     []string{"m"},
 				Usage:       "the magnification factor for ASCII Art Generation",
-				Value:       1.0,
+				Value:       DefaultMagnification,
 				Destination: &inputs.magnification,
 			},
 		},