basic file and cli flag configuration

.gitignore

@@ -1 +1 @@
-uploads
+uploads*

config.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/knadh/koanf"
+	"github.com/knadh/koanf/parsers/toml"
+	"github.com/knadh/koanf/providers/file"
+	"github.com/knadh/koanf/providers/posflag"
+	flag "github.com/spf13/pflag"
+)
+
+func getConfiguration(f *flag.FlagSet) (*koanf.Koanf, error) {
+	k := koanf.New(".")
+
+	cFiles, _ := f.GetStringSlice("conf")
+	for _, c := range cFiles {
+		if err := k.Load(file.Provider(c), toml.Parser()); err != nil {
+			return nil, fmt.Errorf("error loading file: %w", err)
+		}
+	}
+
+	if err := k.Load(posflag.Provider(f, ".", k), nil); err != nil {
+		return nil, fmt.Errorf("error loading config: %w", err)
+	}
+
+	return k, nil
+}

go.mod

@@ -11,5 +11,12 @@ require (
 	github.com/btcsuite/btcd/chaincfg/chainhash v1.0.1 // indirect
 	github.com/decred/dcrd/crypto/blake256 v1.0.0 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
+	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/knadh/koanf v1.5.0 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/pelletier/go-toml v1.7.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
 	golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
 )