Create base structure to allow patching

cli.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/9seconds/mtg/v2/mtglib/network"
+)
+
+type cli struct {
+	conf    *config
+	network *network.Network
+}
+
+func (c *cli) ReadConfig(path string) error {
+	filefp, err := os.Open(path)
+	if err != nil {
+		return fmt.Errorf("cannot open config file: %w", err)
+	}
+
+	defer filefp.Close()
+
+	conf, err := parseConfig(filefp)
+	if err != nil {
+		return fmt.Errorf("cannot parse config: %w", err)
+	}
+
+	ntw, err := makeNetwork(conf)
+	if err != nil {
+		return fmt.Errorf("cannot build a network: %w", err)
+	}
+
+	c.conf = conf
+	c.network = ntw
+
+	return nil
+}