Add some config through flag/env

config/cli.go

@@ -0,0 +1,45 @@
+package config
+
+import (
+	"flag"
+)
+
+// declareFlags registers flags for the structure Options.
+func (c *Config) declareFlags() {
+	flag.BoolVar(&c.Dev, "dev", c.Dev, "Use ui directory instead of embedded assets")
+	flag.StringVar(&c.Bind, "bind", c.Bind, "Bind port/socket")
+	flag.StringVar(&c.ExternalURL, "externalurl", c.ExternalURL, "Begining of the URL, before the base, that should be used eg. in mails")
+
+	// Others flags are declared in some other files when they need specials configurations
+}
+
+func Consolidated() (cfg *Config, err error) {
+	// Define defaults options
+	cfg = &Config{
+		Bind:        ":8082",
+		ExternalURL: "http://localhost:8082",
+	}
+
+	cfg.declareFlags()
+
+	// Then, overwrite that by what is present in the environment
+	err = cfg.FromEnv()
+	if err != nil {
+		return
+	}
+
+	// Finaly, command line takes precedence
+	err = cfg.parseCLI()
+	if err != nil {
+		return
+	}
+
+	return
+}
+
+// parseCLI parse the flags and treats extra args as configuration filename.
+func (c *Config) parseCLI() error {
+	flag.Parse()
+
+	return nil
+}