cleaning up, early http server draft

util/hex_test.go

@@ -0,0 +1,47 @@
+package imageutils
+
+import (
+	"fmt"
+	"image/png"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// Returns path of first occured file
+// with png extension in user's home directory.
+func firstPNG(root string) (filename string,
+	err error) {
+	var fn filepath.WalkFunc = func(path string,
+		info os.FileInfo,
+		fileErr error) error {
+		if fileErr != nil {
+			return fileErr
+		}
+		if !info.IsDir() &&
+			filepath.Ext(path) == ".png" {
+			filename = path
+			return nil
+		}
+		return nil
+	}
+	err = filepath.Walk(root, fn)
+	return
+}
+
+func TestColorToHex(t *testing.T) {
+	root := os.Getenv("HOME")
+	path, err := firstPNG(root)
+	if err != nil {
+		t.Fatal(err)
+	}
+	f, err := os.Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	img, err := png.Decode(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Println(ColorToHex(img.At(0, 0)))
+}