chore: Restructure package directories

cmd/api/config.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/knadh/koanf/parsers/toml"
+	"github.com/knadh/koanf/providers/env"
+	"github.com/knadh/koanf/providers/file"
+	"github.com/knadh/koanf/providers/posflag"
+	"github.com/sirupsen/logrus"
+	flag "github.com/spf13/pflag"
+)
+
+// Config is the config given by the user
+type Config struct {
+	HTTPAddr string `koanf:"listen_addr"`
+}
+
+func initConfig() {
+	f := flag.NewFlagSet("api", flag.ContinueOnError)
+	f.Usage = func() {
+		fmt.Println(f.FlagUsages())
+		os.Exit(0)
+	}
+
+	// Register --config flag.
+	f.StringSlice("config", []string{"config.toml"},
+		"Path to one or more TOML config files to load in order")
+
+	// Register --version flag.
+	f.Bool("version", false, "Show build version")
+	f.Parse(os.Args[1:])
+	// Display version.
+	if ok, _ := f.GetBool("version"); ok {
+		fmt.Println(buildVersion, buildDate)
+		os.Exit(0)
+	}
+
+	// Read the config files.
+	cFiles, _ := f.GetStringSlice("config")
+	for _, f := range cFiles {
+		logger.WithFields(logrus.Fields{
+			"file": f,
+		}).Info("reading config")
+		if err := ko.Load(file.Provider(f), toml.Parser()); err != nil {
+			logger.Fatalf("error reading config: %v", err)
+		}
+	}
+	// Load environment variables and merge into the loaded config.
+	if err := ko.Load(env.Provider("DOGGO_API_", ".", func(s string) string {
+		return strings.Replace(strings.ToLower(
+			strings.TrimPrefix(s, "DOGGO_API_")), "__", ".", -1)
+	}), nil); err != nil {
+		logger.Fatalf("error loading env config: %v", err)
+	}
+
+	ko.Load(posflag.Provider(f, ".", ko), nil)
+}