add lucy config.

cmd/lucy/config.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"gopkg.in/yaml.v2"
+	"os"
+	"path"
+)
+
+type Config struct {
+	Remote string `yaml:"remote"`
+}
+
+func loadConfig() (*Config, error) {
+	homedir, err := os.UserHomeDir()
+	if err != nil {
+		return nil, err
+	}
+
+	f, err := os.Open(path.Join(homedir, ".config/lucy.yaml"))
+	if err != nil {
+		return nil, err
+	}
+
+	cfg := Config{}
+	err = yaml.NewDecoder(f).Decode(&cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	return &cfg, nil
+}

cmd/lucy/main.go

@@ -11,7 +11,13 @@ import (
 )
 
 func main() {
-	c := client.Client{APIRoot: "http://10.24.4.1:8000"}
+	cfg, err := loadConfig()
+	if err != nil {
+		log.Println("Config at $HOME/.config/lucy.yaml failed:", err)
+		cfg = &Config{Remote: "http://localhost:8000"}
+	}
+
+	c := client.Client{APIRoot: cfg.Remote}
 	cmd := parseCommand(os.Args[1:])
 
 	switch cmd.Name {