Save playground state in URL, for easy sharing

fix ssr

packages/components/src/components/SquigglePlayground.tsx

@@ -1,4 +1,4 @@
-import React, { FC, Fragment, useState } from "react";
+import React, { FC, Fragment, useState, useEffect } from "react";
 import ReactDOM from "react-dom";
 import { Path, useForm, UseFormRegister, useWatch } from "react-hook-form";
 import * as yup from "yup";
@@ -35,6 +35,7 @@ interface PlaygroundProps {
   /** If code is set, component becomes controlled */
   code?: string;
   onCodeChange?(expr: string): void;
+  onSettingsChange?(settings: any): void;
   /** Should we show the editor? */
   showEditor?: boolean;
 }
@@ -205,6 +206,7 @@ export const SquigglePlayground: FC<PlaygroundProps> = ({
   showSummary = false,
   code: controlledCode,
   onCodeChange,
+  onSettingsChange,
   showEditor = true,
 }) => {
   const [uncontrolledCode, setUncontrolledCode] = useState(
@@ -233,6 +235,11 @@ export const SquigglePlayground: FC<PlaygroundProps> = ({
   const vars = useWatch({
     control,
   });
+
+  useEffect(() => {
+    onSettingsChange?.(vars);
+  }, [vars]);
+
   const chartSettings = {
     start: Number(vars.diagramStart),
     stop: Number(vars.diagramStop),

packages/website/src/pages/playground.js

@@ -2,7 +2,36 @@ import React from "react";
 import Layout from "@theme/Layout";
 import { SquigglePlayground } from "../components/SquigglePlayground";
 
+function getHashData() {
+  if (typeof window === "undefined") {
+    return {};
+  }
+  try {
+    return JSON.parse(window.decodeURIComponent(window.location.hash.slice(1)));
+  } catch (err) {
+    console.error(err);
+    return {};
+  }
+}
+
+function setHashData(Data) {
+  window.location.hash = window.encodeURIComponent(
+    JSON.stringify({ ...getHashData(), ...Data })
+  );
+}
+
 export default function PlaygroundPage() {
+  const playgroundProps = {
+    initialSquiggleString: "normal(0,1)",
+    height: 700,
+    showTypes: true,
+    ...getHashData(),
+    onCodeChange: (code) => setHashData({ initialSquiggleString: code }),
+    onSettingsChange: (settings) => {
+      const { showTypes, showControls, showSummary, showEditor } = settings;
+      setHashData({ showTypes, showControls, showSummary, showEditor });
+    },
+  };
   return (
     <Layout title="Playground" description="Squiggle Playground">
       <div
@@ -10,11 +39,7 @@ export default function PlaygroundPage() {
           maxWidth: 2000,
         }}
       >
-        <SquigglePlayground
-          initialSquiggleString="normal(0,1)"
-          height={700}
-          showTypes={true}
-        />
+        <SquigglePlayground {...playgroundProps} />
       </div>
     </Layout>
   );