es3: add polyfills and scripts

Makefile

@@ -38,4 +38,10 @@ import_cover:
 	${tic_cli} \
 		'load ${game_src} & import screen ${cover_src} & exit'
 
+build_es3:
+	npm run build
+	./polyfills/inject.sh
+	@make release
+	git restore ${game_src}
+
 # vim: set ts=4 sw=4 autoindent noexpandtab:

polyfills/inject.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+POLYFILLS_FILE="./polyfills/polyfills.js"
+GAME_FILE="game.js"
+TEMP_FILE="merged_game.js"
+
+sed -i 's/TIC()/_()/' "$GAME_FILE"
+
+cat "$POLYFILLS_FILE" "$GAME_FILE" > "$TEMP_FILE"
+mv "$TEMP_FILE" "$GAME_FILE"

polyfills/polyfills.js

@@ -0,0 +1,30 @@
+// script:  js
+function TIC() {
+  gameScreens[currentScreen]()
+}
+
+Object.fromEntries = function (entries) {
+  var obj = {}
+  for (var i = 0; i < entries.length; i++) {
+    var entry = entries[i]
+    var key = entry[0]
+    var value = entry[1]
+    obj[key] = value
+  }
+  return obj
+}
+
+String.prototype.padStart = function padStart(targetLength, padString) {
+  padString = typeof padString !== 'undefined' ? String(padString) : ' '
+  var str = String(this)
+  if (str.length >= targetLength) {
+    return str
+  }
+  var padding = ''
+  var padLength = targetLength - str.length
+  while (padding.length < padLength) {
+    padding += padString
+  }
+  padding = padding.slice(0, padLength)
+  return padding + str
+}