base image + skeleton for loading config file

config.go

@@ -1,8 +1,30 @@
 package main
 
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
 type Config struct {
-	Method string 
-	OutputDir string
+	Method    string `json:method`
+	OutputDir string `json:outputdir`
+	BaseImage string `json:baseimage`
 }
 
+// loads configuration values from json file
+func (c *Config) LoadConfigFromFile(filePath string) {
+	file, _ := os.Open("conf.json")
+	defer file.Close()
+	decoder := json.NewDecoder(file)
+	configuration := Config{}
+	err := decoder.Decode(&configuration)
+	if err != nil {
+		fmt.Println("error:", err)
+	}
+	fmt.Println(configuration.Method)
+	fmt.Println(configuration.OutputDir)
+}
+
+// global register to acccess configuration values
 var ConfigRegister Config

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"flag"
+	"image"
 	_ "image/jpeg"
 	_ "image/png"
 )
@@ -10,10 +11,17 @@ func main() {
 	// command line arguments
 	flag.StringVar(&ConfigRegister.Method, "blending", "darken", "Blending methods : darken, lighten, fuckyfun")
 	flag.StringVar(&ConfigRegister.OutputDir, "output", "./", "Output directory")
+	flag.StringVar(&ConfigRegister.BaseImage, "base-img", "", "Path to the base image to work with. Random image if not set")
 	flag.Parse()
 
 	// get two random images and load them
-	img1 := loadImage(getRandomImage())
+	var img1 image.Image
+	if ConfigRegister.BaseImage != "" {
+		img1 = loadImage(ConfigRegister.BaseImage)
+	} else {
+		img1 = loadImage(getRandomImage())
+	}
+
 	img2 := loadImage(getRandomImage())
 
 	// pool of workers unionizing, ready to blend a new picture using the power of friendship