add ability to launch epoch client

config.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"github.com/BurntSushi/toml"
+	"os"
+	"path/filepath"
+)
+
+type Config struct {
+	WowDir    string
+	LaunchCmd string
+}
+
+const (
+	configDirName = "epochcli"
+	configName    = "config.toml"
+)
+
+var cfgPath string
+
+func setupConfig() (*Config, error) {
+	home := os.Getenv("HOME")
+	if home == "" {
+		return nil, fmt.Errorf("$HOME environment variable not set")
+	}
+
+	newConfig := Config{
+		WowDir:    defaultWowPath,
+		LaunchCmd: defaultLaunchCmd,
+	}
+
+	cfgPath = filepath.Join(home, ".config", configDirName, configName)
+
+	if _, statErr := os.Stat(cfgPath); os.IsNotExist(statErr) {
+		os.MkdirAll(filepath.Join(home, ".config", configDirName), 0755)
+
+		file, err := os.Create(cfgPath)
+		if err != nil {
+			return nil, err
+		}
+		defer file.Close()
+
+		encoder := toml.NewEncoder(file)
+		if err = encoder.Encode(newConfig); err != nil {
+			return nil, err
+		}
+
+		fmt.Printf("Created new config at %s, edit it before running the launcher again\n", cfgPath)
+		os.Exit(0)
+	}
+
+	_, err := toml.DecodeFile(cfgPath, &newConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	return &newConfig, nil
+}