Load config from file

cmd/main.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"flag"
 	"fmt"
+	"log/slog"
 	"os"
 
 	"git.a71.su/Andrew71/pye/cmd/serve"
@@ -11,13 +12,9 @@ import (
 )
 
 func Run() {	
-	// configFlag := flag.String("config", "", "override config file")
-	// flag.Parse()
-	// if *configFlag != "" {
-		// config.Load()
-	// }
 
 	serveCmd := flag.NewFlagSet("serve", flag.ExitOnError)
+	serveConfig := serveCmd.String("config", "", "override config file")
 	servePort := serveCmd.Int("port", 0, "override port")
 	serveDb := serveCmd.String("db", "", "override sqlite database")
 
@@ -31,6 +28,12 @@ func Run() {
 	switch os.Args[1] {
 	case "serve":
 		serveCmd.Parse(os.Args[2:])
+		if *serveConfig != "" {
+			err := config.LoadConfig(*serveConfig)
+			if err != nil {
+				slog.Error("error loading custom config", "error", err)
+			}
+		}
 		if *servePort != 0 {
 			config.Cfg.Port = *servePort
 		}

config.json

@@ -0,0 +1,5 @@
+{
+    "port": 7102,
+    "key-file": "private.key",
+    "sqlite-file": "data.db"
+}

config/config.go

@@ -1,5 +1,11 @@
 package config
 
+import (
+	"encoding/json"
+	"log/slog"
+	"os"
+)
+
 type Config struct {
 	Port       int    `json:"port"`
 	KeyFile    string `json:"key-file"`
@@ -7,14 +13,39 @@ type Config struct {
 }
 
 var DefaultConfig = Config{
-	Port: 7102,
-	KeyFile: "private.key",
+	Port:       7102,
+	KeyFile:    "private.key",
 	SQLiteFile: "data.db",
 }
 
-var Cfg = MustLoadConfig()
+var (
+	DefaultLocation = "config.json"
+	Cfg             Config
+)
 
-// TODO: Implement
-func MustLoadConfig() Config {
-	return DefaultConfig
+func LoadConfig(filename string) error {
+	data, err := os.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+	temp_config := DefaultConfig
+	err = json.Unmarshal(data, &temp_config)
+	if err != nil {
+		return err
+	}
+	Cfg = temp_config
+	slog.Info("Loaded config", "file", filename)
+	return nil
+}
+
+func MustLoadConfig() {
+	err := LoadConfig(DefaultLocation)
+	if err != nil {
+		slog.Error("error initially loading config", "error", err)
+		os.Exit(1)
+	}
+}
+
+func init() {
+	MustLoadConfig()
 }