adding source

Author: harshzalavadiya

main.go

@@ -0,0 +1,145 @@
+package main
+
+import (
+	"fmt"
+	"image"
+	"image/png"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/disintegration/gift"
+	"github.com/urfave/cli"
+)
+
+// Declarations
+const imgIcon = "icon.png"
+const imgSplash = "splash.png"
+
+func main() {
+	//Defining Version
+	cli.VersionFlag = cli.BoolFlag{
+		Name:  "version, v",
+		Usage: "prints utility version",
+	}
+
+	// Magic happens here
+	app := cli.NewApp()
+	app.Name = "generate, g"
+	app.Version = "1.0.0"
+	app.Usage = "generate ionic icons and splash screens!"
+	app.Action = func(c *cli.Context) error {
+		for _, platform := range Dirs(".") {
+			GenerateResources(GetImages(platform))
+		}
+		return nil
+	}
+
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+}
+
+func Exists(name string) bool {
+	if _, err := os.Stat(name); err != nil {
+		if os.IsNotExist(err) {
+			return false
+		}
+	}
+	return true
+}
+
+func Dirs(path string) []string {
+	var platforms []string
+	files, err := ioutil.ReadDir(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for _, file := range files {
+		if IsDir(file.Name()) {
+			platforms = append(platforms, file.Name())
+		}
+	}
+
+	return platforms
+}
+
+func IsDir(path string) bool {
+	fileInfo, _ := os.Stat(path)
+	return fileInfo.IsDir()
+}
+
+func GenerateResources(pngs []string) {
+	for _, p := range pngs {
+		width, height := GetImageDimension(p)
+		src := LoadImage(imgIcon)
+		if strings.Contains(p, "\\splash\\") {
+			src = LoadImage(imgSplash)
+		}
+		filters := map[string]gift.Filter{
+			"crop_to_size": gift.ResizeToFill(width, height, gift.LanczosResampling, gift.CenterAnchor),
+		}
+		for _, filter := range filters {
+			g := gift.New(filter)
+			dst := image.NewNRGBA(g.Bounds(src.Bounds()))
+			g.Draw(dst, src)
+			SaveImage(p, dst)
+		}
+		fmt.Printf("✓ Updated — %s (%dx%d)\n", p, width, height)
+	}
+}
+
+func GetImages(root string) []string {
+	var pngs []string
+	err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if filepath.Ext(path) == ".png" {
+			pngs = append(pngs, path)
+		}
+		return nil
+	})
+	if err != nil {
+		panic(err)
+	}
+	return pngs
+}
+
+func GetImageDimension(path string) (int, int) {
+	file, err := os.Open(path)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+	}
+
+	image, _, err := image.DecodeConfig(file)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%s: %v\n", path, err)
+	}
+	return image.Width, image.Height
+}
+
+func LoadImage(filename string) image.Image {
+	f, err := os.Open(filename)
+	if err != nil {
+		log.Fatalf("os.Open failed: %v", err)
+	}
+	img, _, err := image.Decode(f)
+	if err != nil {
+		log.Fatalf("image.Decode failed: %v", err)
+	}
+	return img
+}
+
+func SaveImage(filename string, img image.Image) {
+	f, err := os.Create(filename)
+	if err != nil {
+		log.Fatalf("os.Create failed: %v", err)
+	}
+	err = png.Encode(f, img)
+	if err != nil {
+		log.Fatalf("png.Encode failed: %v", err)
+	}
+}