refactor global config into subpackage

config/main.go

@@ -0,0 +1,50 @@
+package config
+
+import (
+	"os"
+)
+
+var Global = NewDefaultConfig()
+var configChan = make(chan ConfigMsg)
+
+type Config map[string]string
+
+type ConfigMsg struct {
+	key string
+	val string
+}
+
+func Update(k, v string) {
+	//log.Noticef("config update: %s = %s", k, v)
+	configChan <- ConfigMsg{k, v}
+}
+
+// Toggle a boolean option
+func Toggle(k string) {
+	if Global[k] == "0" {
+		Global[k] = "1"
+	} else {
+		Global[k] = "0"
+	}
+}
+
+func NewDefaultConfig() Config {
+	docker := os.Getenv("DOCKER_HOST")
+	if docker == "" {
+		docker = "unix:///var/run/docker.sock"
+	}
+	config := Config{
+		"dockerHost":     docker,
+		"filterStr":      "",
+		"sortField":      "id",
+		"sortReverse":    "0",
+		"enableHeader":   "0",
+		"loggingEnabled": "1",
+	}
+	go func() {
+		for m := range configChan {
+			config[m.key] = m.val
+		}
+	}()
+	return config
+}