Added extract command (extracts resources to the current working directory).

cmd/tins2020/extract.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+
+	rice "github.com/GeertJohan/go.rice"
+)
+
+func copyFile(path string, file *rice.File) error {
+	dir := filepath.Dir(path)
+	os.MkdirAll(dir, 0777)
+	dst, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer dst.Close()
+	_, err = io.Copy(dst, file)
+	return err
+}
+
+func copyBoxToDisk(box *rice.Box) error {
+	return box.Walk("", func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		src, err := box.Open(path)
+		if err != nil {
+			return err
+		}
+		return copyFile(filepath.Join(box.Name(), path), src)
+	})
+}

cmd/tins2020/tins2020.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"log"
 
 	rice "github.com/GeertJohan/go.rice"
@@ -26,6 +27,20 @@ func logSDLVersion() {
 }
 
 func run() error {
+	var extract bool
+	flag.BoolVar(&extract, "extract-resources", false, "extracts all resources to the current working directory")
+	flag.Parse()
+
+	ctx, err := tins2020.NewContext(rice.MustFindBox("res"))
+	if err != nil {
+		return err
+	}
+	defer ctx.Destroy()
+
+	if extract {
+		return copyBoxToDisk(ctx.Resources.Box())
+	}
+
 	if err := sdl.Init(sdl.INIT_EVERYTHING); err != nil {
 		return err
 	}
@@ -38,12 +53,6 @@ func run() error {
 	}
 	defer ttf.Quit()
 
-	ctx, err := tins2020.NewContext(rice.MustFindBox("res"))
-	if err != nil {
-		return err
-	}
-	defer ctx.Destroy()
-
 	if ctx.Settings.Window.Location == nil {
 		ctx.Settings.Window.Location = tins2020.PtPtr(sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED)
 	}

resources.go

@@ -13,6 +13,10 @@ type Resources struct {
 	copy vfs.CopyDir
 }
 
+func (r *Resources) Box() *rice.Box {
+	return r.box
+}
+
 func (r *Resources) Destroy() {
 	r.copy.Destroy()
 }