convert update_template.sh to js for windows support

site/package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "dev": "sapper dev",
     "sapper": "sapper build --legacy",
-    "update": "sh scripts/update_template.sh && node scripts/get-contributors.js",
+    "update": "node scripts/update_template.js && node scripts/get-contributors.js",
     "start": "node __sapper__/build",
     "cy:run": "cypress run",
     "cy:open": "cypress open",
@@ -29,6 +29,7 @@
     "passport-github": "^1.1.0",
     "prismjs": "^1.15.0",
     "session-file-store": "^1.2.0",
+    "shelljs": "^0.8.3",
     "sirv": "^0.2.0",
     "yootils": "0.0.14"
   },

site/scripts/update_template.js

@@ -0,0 +1,26 @@
+const sh = require('shelljs');
+const fs = require('fs')
+
+sh.cd(__dirname+'/../')
+
+// fetch svelte app
+sh.rm('-rf','scripts/svelte-app')
+sh.exec('npx degit sveltejs/template scripts/svelte-app')
+
+// update repl-viewer.css based on template
+sh.cp('scripts/svelte-app/public/global.css', 'static/repl-viewer.css')
+
+// remove src (will be recreated client-side) and node_modules
+sh.rm('-rf', 'scripts/svelte-app/src')
+sh.rm('-rf', 'scripts/svelte-app/node_modules')
+
+// build svelte-app.json
+const appPath = 'scripts/svelte-app'
+let files = []
+
+for (const path of sh.find(appPath).filter(p => fs.lstatSync(p).isFile()) ) {
+    files.push({ path: path.slice(appPath.length + 1), data: fs.readFileSync(path).toString() });
+}
+
+fs.writeFileSync('static/svelte-app.json', JSON.stringify(files));
+