Set options from defaults on first start

Data/GenericData.dat specifies what the default values for some options
should be. Respect them on startup if the options in config are unset.

internal/assetstore/assetstore.go

@@ -35,6 +35,7 @@ type AssetStore struct {
 
 	// These members are used to store things we've already loaded
 	fonts   map[string]*Font
+	generic *data.Generic
 	maps    map[string]*Map
 	menus   map[string]*Menu
 	objs    map[string]*Object

internal/assetstore/data.go

@@ -0,0 +1,62 @@
+package assetstore
+
+import (
+	"code.ur.gs/lupine/ordoor/internal/config"
+	"code.ur.gs/lupine/ordoor/internal/data"
+)
+
+// Generic returns a struct containing a grab-bag of otherwise-unrelated data
+// TODO: it would be nice if this could be cleaner
+func (a *AssetStore) Generic() (*data.Generic, error) {
+	if a.generic != nil {
+		return a.generic, nil
+	}
+
+	filename, err := a.lookup("GenericData", "dat", "Data")
+	if err != nil {
+		return nil, err
+	}
+
+	generic, err := data.LoadGeneric(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	a.generic = generic
+
+	return generic, nil
+}
+
+func (a *AssetStore) DefaultOptions() (*config.Options, error) {
+	cfg := &config.Options{}
+	g, err := a.Generic()
+	if err != nil {
+		return nil, err
+	}
+
+	cfg.PlayMovies = intToBool(g.Options[data.OptionMovies])
+	cfg.PlayMusic = intToBool(g.Options[data.OptionMusic])
+	cfg.CombatVoices = intToBool(g.Options[data.OptionCombatVoices])
+	cfg.ShowGrid = intToBool(g.Options[data.OptionGrid])
+	cfg.ShowPaths = intToBool(g.Options[data.OptionShowPaths])
+	cfg.PointSaving = intToBool(g.Options[data.OptionPointSave])
+	cfg.AutoCutLevel = intToBool(g.Options[data.OptionAutoCutLevel])
+	cfg.Animations = intToBool(g.Options[data.OptionShowUnitAnimations])
+
+	// These are overrides of data.OptionCombatResolution. *This* default from
+	// 1998 is no good at all!
+	cfg.XRes = 1280
+	cfg.YRes = 1024
+
+	cfg.MusicVolume = g.Options[data.OptionMusicVolume]
+	cfg.SFXVolume = g.Options[data.OptionSoundEffectsVolume]
+
+	cfg.UnitSpeed = g.Options[data.OptionUnitAnimationSpeed]
+	cfg.AnimSpeed = g.Options[data.OptionEffectAnimationSpeed]
+
+	return cfg, nil
+}
+
+func intToBool(i int) bool {
+	return i > 0
+}

internal/config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"errors"
 	"os"
 	"path/filepath"
 
@@ -37,6 +38,7 @@ type Options struct {
 type Config struct {
 	filename string `toml:"-"`
 
+	Defaults *Options `toml:"-"`
 	Ordoor   `toml:"ordoor"`
 	Options  `toml:"options"`
 }
@@ -54,6 +56,12 @@ func Load(filename string) (*Config, error) {
 	return &out, err
 }
 
+func (c *Config) HasUnsetOptions() bool {
+	var empty Options
+
+	return c.Options == empty
+}
+
 func (c *Config) Save() error {
 	f, err := os.OpenFile(c.filename, os.O_WRONLY, 0644)
 	if err != nil {
@@ -69,6 +77,16 @@ 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")
+	}
+
+	c.Options = *c.Defaults
+
+	return c.Save()
+}
+
 func (o *Options) ResolutionIndex() int {
 	if o.XRes == 640 && o.YRes == 480 {
 		return 1

internal/ordoor/ordoor.go

@@ -53,6 +53,18 @@ func Run(configFile string, overrideX, overrideY int) error {
 		return fmt.Errorf("Failed to initialize asset store: %v", err)
 	}
 
+	defaults, err := assets.DefaultOptions()
+	if err != nil {
+		return fmt.Errorf("Failed to read option defaults: %v", err)
+	}
+
+	cfg.Defaults = defaults
+	if cfg.HasUnsetOptions() {
+		if err := cfg.ResetDefaults(); err != nil {
+			return fmt.Errorf("Failed to set options on first-start: %v", err)
+		}
+	}
+
 	if _, err := audio.NewContext(48000); err != nil {
 		return fmt.Errorf("Failed to set up audio context: %v", err)
 	}