Update reamde

README.md

@@ -0,0 +1,66 @@
+# Freeform
+
+Obsidian freeform plugin. This lets you write arbitrary JavaScript,
+including importing ESM modules, injecting styles, and much more.
+
+### Inspired by Observable
+
+This brings a taste of [Observable](https://observablehq.com/) to
+[Obsidian](https://obsidian.md/). Some common elements include:
+
+- You can write blocks of code which run in a light sandboxed environment
+- There's a `display()` function to show values and elements, just like
+  Observable Framework's [explicit display system](https://observablehq.com/framework/javascript#explicit-display).
+
+### Based on iframes
+
+Everything you write is run within a sandboxed iframe, making it safer to do more
+creative coding within Obsidian without affecting the surrounding page.
+
+## Get started
+
+Install the freeform plugin, and create a fenced code block with the language
+set to `freeform`. For example:
+
+    ```freeform
+    display(42);
+    ```
+
+That should, once you're done editing it and have clicked away from the code block,
+show the number 42. Now you've learned all of the concepts in freeform! It's
+JavaScript, and you can use the `display()` method to show a value. See the rest
+of this readme for some examples.
+
+### Examples
+
+    ```freeform
+    import *  as Plot from "https://cdn.jsdelivr.net/npm/@observablehq/plot@0.6/+esm";
+    const widths = [
+      ["Val Town", 1024],
+      ["Val Town (after)", 900],
+      ["GitHub", 830],
+      ["Radicle", 723],
+      ["Replicate", 653],
+      ["Glitch", 612],
+      ["GitLab", 842],
+      ["Observable", 640]
+    ].map(([name, width]) => ({ name, width }))
+
+    display(Plot.barX(widths, {
+      x: "width",
+      y: "name",
+      marginLeft: 100,
+      fill: "name"
+    }).plot({ height: 400, width }))
+    ```
+
+### Notes
+
+- There is a `width` variable, much like [Observable's](https://observablehq.com/framework/javascript#width), but
+  it is not live-updating or reactive. This project does not include
+  Observable-style reactivity: your JavaScript runs just the same
+  way as it does on any webpage.
+- Only HTTP ESM imports are supported. This isn't Node.js or Deno - there
+  isn't a node_modules directory, and you don't have short names for dependencies.
+  Thankfully, this usually isn't a problem because you can use https://esm.sh/
+  https://www.jsdelivr.com/ and more to import modules.

main.js

@@ -2,39 +2,19 @@ const { Plugin, MarkdownRenderer } = require("obsidian");
 
 module.exports = class IframeBlockPlugin extends Plugin {
   async onload() {
-    this.registerMarkdownCodeBlockProcessor("iframe", async (src, el, ctx) => {
-      // Get Parameters
+    this.registerMarkdownCodeBlockProcessor(
+      "freeform",
+      async (src, el, ctx) => {
         try {
+          // Give this iframe an identifier so that when it sends messages
+          // from the iframe context back up, we know which iframe's messages
+          // belong to which code blocks
+          const iframeId = crypto.randomUUID();
           const rootEl = el.createEl("div", {
             cls: "run-block",
           });
           const iframe = rootEl.createEl("iframe", { cls: "run-block-frame" });
-        iframe.srcdoc = src;
-        iframe.height = "200px";
-        iframe.addEventListener("load", () => {
-          const height = iframe.contentWindow?.document.body.offsetHeight + 40;
-          iframe.height = height + "px";
-        });
-        const srcEl = rootEl.createEl("div", { cls: "run-block-src" });
-        MarkdownRenderer.render(
-          this.app,
-          `\`\`\`html\n${src}\n\`\`\``,
-          srcEl,
-          ctx.sourcePath,
-          this,
-        );
-      } catch (error) {
-        el.createEl("h3", { text: error });
-      }
-    });
 
-    this.registerMarkdownCodeBlockProcessor("iframeturbo", async (src, el, ctx) => {
-      // Get Parameters
-      try {
-        const rootEl = el.createEl("div", {
-          cls: "run-block",
-        });
-        const iframe = rootEl.createEl("iframe", { cls: "run-block-frame" });
           iframe.srcdoc = `<!DOCTYPE html>
 <style>
 :root{--syntax_normal:#1b1e23;--syntax_comment:#a9b0bc;--syntax_number:#20a5ba;--syntax_keyword:#c30771;--syntax_atom:#10a778;--syntax_string:#008ec4;--syntax_error:#ffbedc;--syntax_unknown_variable:#838383;--syntax_known_variable:#005f87;--syntax_matchbracket:#20bbfc;--syntax_key:#6636b4;--mono_fonts:82%/1.5 Menlo,Consolas,monospace}.observablehq--collapsed,.observablehq--expanded,.observablehq--function,.observablehq--gray,.observablehq--import,.observablehq--string:after,.observablehq--string:before{color:var(--syntax_normal)}.observablehq--collapsed,.observablehq--inspect a{cursor:pointer}.observablehq--field{text-indent:-1em;margin-left:1em}.observablehq--empty{color:var(--syntax_comment)}.observablehq--blue,.observablehq--keyword{color:#3182bd}.observablehq--forbidden,.observablehq--pink{color:#e377c2}.observablehq--orange{color:#e6550d}.observablehq--boolean,.observablehq--null,.observablehq--undefined{color:var(--syntax_atom)}.observablehq--bigint,.observablehq--date,.observablehq--green,.observablehq--number,.observablehq--regexp,.observablehq--symbol{color:var(--syntax_number)}.observablehq--index,.observablehq--key{color:var(--syntax_key)}.observablehq--prototype-key{color:#aaa}.observablehq--empty{font-style:oblique}.observablehq--purple,.observablehq--string{color:var(--syntax_string)}.observablehq--error,.observablehq--red{color:#e7040f}.observablehq--inspect{font:var(--mono_fonts);overflow-x:auto;display:block;white-space:pre}.observablehq--error .observablehq--inspect{word-break:break-all;white-space:pre-wrap}
@@ -43,39 +23,49 @@ module.exports = class IframeBlockPlugin extends Plugin {
 import * as Plot from "https://cdn.jsdelivr.net/npm/@observablehq/plot@0.6/+esm";
 import { Inspector } from "https://unpkg.com/@observablehq/inspector@5.0.0?module";
 
-try {
-  ${src}
-  if (typeof output !== 'undefined') {
-    inspect(output);
-  }
-} catch (e) {
-  inspect(e);
-}
-
-function inspect(val) {
+globalThis.display = function display(val) {
   const d = document.body.appendChild(document.createElement('div'))
   const inspector = new Inspector(d);
   inspector.fulfilled(val);
 }
 
+globalThis.width = window.innerWidth;
+
 const resizeObserver = new ResizeObserver((entries) => {
-  parent.postMessage({ type: 'height', height: document.body.offsetHeight }, '*');
+  parent.postMessage({
+    type: 'height',
+    height: document.body.offsetHeight,
+    id: ${JSON.stringify(iframeId)}
+  }, '*');
 });
 
 resizeObserver.observe(document.body);
 
+import(${JSON.stringify(`data:text/javascript;base64,${btoa(src)}`)}).catch(e => {
+console.log(e);
+  display(e);
+});
 </script>`;
           iframe.height = "200px";
+
+          // Resize the iframe as soon as it loads
           iframe.addEventListener("load", () => {
-          const height = iframe.contentWindow?.document.body.offsetHeight + 40;
+            const height =
+              iframe.contentWindow?.document.body.offsetHeight + 40;
             iframe.height = height + "px";
           });
+
+          // Resize the iframe when we get a message that its contents
+          // have been measured.
           window.addEventListener("message", (evt) => {
-          if (evt.data.type === 'height') {
+            if (evt.data.type === "height" && evt.data.id === iframeId) {
               iframe.height = evt.data.height + 40 + "px";
             }
           });
+
           const srcEl = rootEl.createEl("div", { cls: "run-block-src" });
+
+          // Show the source code below the iframe
           MarkdownRenderer.render(
             this.app,
             `\`\`\`js\n${src}\n\`\`\``,
@@ -86,10 +76,11 @@ resizeObserver.observe(document.body);
         } catch (error) {
           el.createEl("h3", { text: error });
         }
-    });
+      },
+    );
   }
 
   onunload() {
-    console.log("Unloading iframe plugin...");
-  }
+    // console.log("Unloading iframe plugin...");
   }
+};

manifest.json

@@ -1,9 +1,9 @@
 {
-  "id": "iframe-block-plugin",
-  "name": "Iframe code block",
+  "id": "iframe-freeform",
+  "name": "Freeform",
   "version": "0.0.0",
   "minAppVersion": "0.0.0",
-  "description": "Creates an iframe block",
+  "description": "Make visualizations and run arbitrary code with JavaScript + iframe blocks.",
   "author": "tmcw",
   "authorUrl": "https://github.com/tmcw",
   "isDesktopOnly": false

styles.css

@@ -6,7 +6,7 @@
 
 .run-block-frame {
   border-top-left-radius: 4px;
-  border-top-right: 4px;
+  border-top-right-radius: 4px;
   background: #fff;
   width: 100%;
   padding: 10px;