Start reorganising for multiple games

internal/config/config.go

@@ -2,15 +2,16 @@ package config
 
 import (
 	"errors"
+	"fmt"
 	"os"
 	"path/filepath"
 
 	"github.com/BurntSushi/toml"
 )
 
-type Ordoor struct {
-	DataDir     string   `toml:"data_dir"`
-	VideoPlayer []string `toml:"video_player"`
+type Engine struct {
+	DataDir string `toml:"data_dir"`
+	Palette string `toml:"palette"`
 }
 
 // Things set in the options hash
@@ -38,12 +39,40 @@ type Options struct {
 type Config struct {
 	filename string `toml:"-"`
 
+	VideoPlayer []string          `toml:"video_player"`
+	Engines     map[string]Engine `toml:"engines"`
+
+	DefaultEngineName string `toml:"default_engine"`
+
+	// FIXME: options may well end up being per-engine too
 	Defaults *Options `toml:"-"`
-	Ordoor   `toml:"ordoor"`
 	Options  `toml:"options"`
 }
 
-func Load(filename string) (*Config, error) {
+func (c *Config) Engine(name string) *Engine {
+	engine, ok := c.Engines[name]
+	if !ok {
+		return nil
+	}
+
+	return &engine
+}
+
+func (c *Config) DefaultEngine() *Engine {
+	return c.Engine(c.DefaultEngineName)
+}
+
+// TODO: case-insensitive lookup
+func (c *Config) DataFile(engine string, path string) string {
+	cfg, ok := c.Engines[engine]
+	if !ok {
+		return ""
+	}
+
+	return filepath.Join(cfg.DataDir, path)
+}
+
+func Load(filename string, overrideDefaultEngine string) (*Config, error) {
 	var out Config
 
 	_, err := toml.DecodeFile(filename, &out)
@@ -53,7 +82,15 @@ func Load(filename string) (*Config, error) {
 
 	out.filename = filename
 
-	return &out, err
+	if overrideDefaultEngine != "" {
+		out.DefaultEngineName = overrideDefaultEngine
+	}
+
+	if out.DefaultEngine() == nil {
+		return nil, fmt.Errorf("Default engine %q not configured", out.DefaultEngineName)
+	}
+
+	return &out, nil
 }
 
 func (c *Config) HasUnsetOptions() bool {
@@ -72,11 +109,6 @@ func (c *Config) Save() error {
 	return toml.NewEncoder(f).Encode(c)
 }
 
-// TODO: case-insensitive lookup
-func (c *Config) DataFile(path string) string {
-	return filepath.Join(c.DataDir, path)
-}
-
 func (c *Config) ResetDefaults() error {
 	if c.Defaults == nil {
 		return errors.New("Defaults not available")