use go generate

brought in jteeuwen/go-bindata and friends.

I honestly like their interface much, much better than the previous one.

Makefile

@@ -1,3 +0,0 @@
-static.go: static/*
-	go get -v github.com/chsc/bin2go
-	bin2go -p main -s static.go -c -a static/*

main.go

@@ -9,33 +9,33 @@ import (
 	"os"
 	"time"
 
+	"github.com/elazarl/go-bindata-assetfs"
 	"github.com/gorilla/sessions"
 )
 
+//go:generate go-bindata -o static.go static/
+
 const MAX = 12
 
 var port = flag.Int("port", 8000, "listen on this port")
 
 var store = sessions.NewCookieStore([]byte(os.Getenv("MMG_SECRET_KEY")))
-var statics map[string][]byte
 
 func main() {
-	statics = map[string][]byte{
-		"/":          staticIndexHtml,
-		"/jquery.js": staticJqueryJs,
-		"/math.css":  staticMathCss,
-		"/math.js":   staticMathJs,
-		"/addsub/":   staticAddsubHtml,
-		"/mul/":      staticMulHtml,
-	}
 	rand.Seed(time.Now().UTC().UnixNano())
 	flag.Parse()
 	http.HandleFunc("/api/v0/addsub/problem/", addsub)
 	http.HandleFunc("/api/v0/mul/problem/", mul)
 	http.HandleFunc("/api/v0/attempt/", attempt)
-	http.HandleFunc(
+	http.Handle(
 		"/",
-		static,
+		http.FileServer(
+			&assetfs.AssetFS{
+				Asset:    Asset,
+				AssetDir: AssetDir,
+				Prefix:   "static",
+			},
+		),
 	)
 	http.HandleFunc(
 		"/reset/",
@@ -52,19 +52,3 @@ func main() {
 		log.Fatal("ListenAndServe:", err)
 	}
 }
-
-func static(w http.ResponseWriter, req *http.Request) {
-	if content, ok := statics[req.URL.Path]; !ok {
-		http.Error(w, "file not found", http.StatusNotFound)
-		return
-	} else {
-		if req.URL.Path == "/math.css" {
-			w.Header().Set("Content-Type", "text/css")
-		}
-		_, err := w.Write(content)
-		if err != nil {
-			http.Error(w, "problem writing response", http.StatusInternalServerError)
-			return
-		}
-	}
-}