Add a default configuration

cmd/config.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"path"
+	"strings"
 
 	"github.com/BurntSushi/toml"
 )
@@ -15,8 +16,15 @@ type Config struct {
 	AccessToken  string               `toml:"access_token"`
 	OutputFormat string               `toml:"output_format"`
 	Colors       map[string][]float32 `toml:"colors"`
+	userAgent    string
 }
 
+var (
+	DefaultConfig = Config{
+		userAgent: initUserAgent(),
+	}
+)
+
 // Validate configuration struct
 func (c *Config) Validate() error {
 	var err error
@@ -52,25 +60,40 @@ func (c *Config) validateColors() (err error) {
 	return err
 }
 
-func LoadConfig(s string) (Config, error) {
+func LoadConfig(s string) (*Config, error) {
 	var err error
-	var c Config
+	var c *Config = &Config{}
+
+	*c = DefaultConfig
 
 	if _, err := toml.Decode(s, &c); err != nil {
 		err = fmt.Errorf("fatal: failed to parse; %w", err)
 	}
 
+	envAccessToken := os.Getenv("LIFX_ACCESS_TOKEN")
+	if envAccessToken != "" {
+		c.AccessToken = envAccessToken
+	}
+
 	return c, err
 }
 
-func LoadConfigFile(configPath string) (Config, error) {
+func LoadConfigFile(configPath string) (*Config, error) {
 	var err error
-	var c Config
+
+	var c *Config = &Config{}
+
+	*c = DefaultConfig
 
 	if _, err := toml.DecodeFile(configPath, &c); err != nil {
 		err = fmt.Errorf("fatal: failed to parse %s; %w", configPath, err)
 	}
 
+	envAccessToken := os.Getenv("LIFX_ACCESS_TOKEN")
+	if envAccessToken != "" {
+		c.AccessToken = envAccessToken
+	}
+
 	return c, err
 }
 
@@ -97,3 +120,12 @@ func getConfigPath() string {
 
 	return configPath
 }
+
+func initUserAgent() string {
+	var b strings.Builder
+
+	b.WriteString("lume")
+	b.WriteRune('/')
+	b.WriteString(Version)
+	return b.String()
+}

cmd/main.go

@@ -5,16 +5,11 @@ import (
 	"flag"
 	"fmt"
 	"os"
-	"strings"
 
 	"git.kill0.net/chill9/lifx-go"
 )
 
-var userAgent string
-
 func init() {
-	userAgent = initUserAgent()
-
 	RegisterCommand(NewCmdHelp())
 	RegisterCommand(NewCmdLs())
 	RegisterCommand(NewCmdPoweroff())
@@ -32,7 +27,7 @@ var BuildDate string
 var GitCommit string
 
 func Main(args []string) (int, error) {
-	var config Config
+	var config *Config
 	var err error
 
 	if len(args) == 1 {
@@ -64,12 +59,12 @@ func Main(args []string) (int, error) {
 
 	c := lifx.NewClient(
 		config.AccessToken,
-		lifx.WithUserAgent(userAgent),
+		lifx.WithUserAgent(config.userAgent),
 	)
 
 	cmdArgs := CmdArgs{
 		Client: c,
-		Config: config,
+		Config: *config,
 		Args:   args[2:],
 	}
 
@@ -93,12 +88,3 @@ func Main(args []string) (int, error) {
 
 	return exitCode, err
 }
-
-func initUserAgent() string {
-	var b strings.Builder
-
-	b.WriteString("lume")
-	b.WriteRune('/')
-	b.WriteString(Version)
-	return b.String()
-}