make update_template work on windows

Author: Rich-Harris

package-lock.json

@@ -6,7 +6,7 @@
     "dev": "sapper dev",
     "start": "node __sapper__/build",
     "sapper": "sapper build",
-    "update_template": "sh ./scripts/update_template.sh",
+    "update_template": "node scripts/update_template.js",
     "stage": "now",
     "deploy": "npm run stage && now alias",
     "predeploy": "git-branch-is master && git diff --exit-code && npm run sapper",
@@ -65,6 +65,7 @@
     "rollup": "^0.64.1",
     "serve-static": "^1.13.1",
     "session-file-store": "^1.2.0",
+    "shelljs": "^0.8.3",
     "sourcemap-codec": "^1.4.1",
     "svelte-extras": "^2.0.0"
   },

package.json

@@ -0,0 +1,25 @@
+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));