Add demo project

demo/config.json

@@ -0,0 +1,12 @@
+{
+    "app_name": "Awesome App",
+    "version": 1.4,
+    "debug": true,
+    "database": {
+        "adapter": "mysql",
+        "host": "127.0.0.1",
+        "port": 3306,
+        "username": "root",
+        "password": ""
+    }
+}

demo/demo.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"flag"
+	"log"
+
+	"github.com/localhots/secondly"
+)
+
+// testConf is our app's configuration
+type testConf struct {
+	AppName  string           `json:"app_name"`
+	Version  float32          `json:"version"`
+	Debug    bool             `json:"debug"`
+	Database testDatabaseConf `json:"database"`
+}
+
+type testDatabaseConf struct {
+	Adapter  string `json:"adapter"`
+	Host     string `json:"host"`
+	Port     int    `json:"port"`
+	Username string `json:"username"`
+	Password string `json:"password"`
+}
+
+// conf is the variable that holds configuration
+var conf = testConf{}
+
+func main() {
+	// Setting up flags
+	secondly.SetupFlags()
+	flag.Parse()
+
+	// Delegating configuration management to Secondly
+	secondly.Manage(&conf)
+	// Handling file system events
+	secondly.HandleFSEvents()
+	// Starting a web server
+	secondly.StartServer("", 5500)
+	// Defining callbacks
+	secondly.OnChange("AppName", func(o, n interface{}) {
+		log.Printf("OMG! AppName changed from %q to %q", o, n)
+	})
+
+	// Other application startup logic
+	select {}
+}

file_ops.go

@@ -23,13 +23,14 @@ func readFile(file string) ([]byte, error) {
 }
 
 func writeFile(file string, body []byte) error {
-	var fd *os.File
 	var err error
 	if ok := fileExist(file); !ok {
 		if err = mkdirp(file); err != nil {
 			return err
 		}
 	}
+
+	var fd *os.File
 	if fd, err = os.OpenFile(file, os.O_TRUNC|os.O_WRONLY|os.O_CREATE, filePerm); err != nil {
 		return err
 	}