feat: config file

cmd/client/client.go

@@ -1,7 +1,13 @@
 package main
 
 import (
+	"strings"
+
 	"git.brettb.xyz/goinv/client/internal/app"
+	"git.brettb.xyz/goinv/client/internal/config"
+	"github.com/knadh/koanf/parsers/json"
+	"github.com/knadh/koanf/providers/env"
+	"github.com/knadh/koanf/providers/file"
 	"go.uber.org/zap"
 )
 
@@ -9,7 +15,21 @@ func main() {
 	logger, _ := zap.NewProduction()
 	defer logger.Sync()
 
-	a := app.NewApp("goinv", "0.1.0", "http://localhost:3001", logger) // TODO: CONFIGURATION
+	config.LoadConfig(file.Provider("config.json"), json.Parser())
+	config.LoadConfig(env.Provider("GOINV_", ".", func(s string) string {
+		return strings.Replace(strings.ToLower(
+			strings.TrimPrefix(s, "GOINV")), "_", ".", -1,
+		)
+	}), nil)
+
+	var cfg config.Config
+
+	err := config.Unmarshal(&cfg)
+	if err != nil {
+		logger.Panic("could not load config", zap.Error(err))
+	}
+
+	a := app.NewApp("goinv", "0.1.1", cfg.API.URL, logger)
 
 	if err := a.Run(); err != nil {
 		logger.Panic("application errored", zap.Error(err))