clean up demo a bit

src/components/JQueryTerminal.tsx

@@ -3,6 +3,7 @@ import * as $ from "jquery";
 import 'jquery.terminal';
 import 'jquery.terminal/css/jquery.terminal.min.css';
 import {terminal} from "jquery";
+import {usePyodide} from "../hooks/usePyodide";
 
 interface Props {
     interpreter?: TypeOrArray<JQueryTerminal.Interpreter>,
@@ -32,9 +33,8 @@ export const JQueryTerminal: React.ForwardRefExoticComponent<React.PropsWithoutR
             update: (line: number, str: string) => {
                 terminalObjectRef.current?.update(line, str);
             },
-            freeze: () => {
-                terminalObjectRef.current?.freeze(true);
-                terminalObjectRef.current?.set_prompt("");
+            freeze: (toggle?: boolean) => {
+                terminalObjectRef.current?.freeze(toggle);
             },
             setPrompt: (prompt) => {
                 terminalObjectRef.current?.set_prompt(prompt);

src/components/PlaygroundTerminal.tsx

@@ -1,10 +1,10 @@
 import {JQueryTerminal} from "./JQueryTerminal";
 import React, {useEffect, useRef} from "react";
-import {usePyodide} from "../hooks/usePyodide";
-
-import {terminal} from "jquery";
-import {useEnvironmentSetup} from "../hooks/useEnvironmentSetup";
+import {EnvironmentStatus, useEnvironmentSetup} from "../hooks/useEnvironmentSetup";
+import {PyodideStatus} from "../hooks/usePyodide";
+import {PyodideInterface} from "pyodide";
 
+// Taken from https://terminal.jcubic.pl/examples.php
 function progress(percent, width) {
     var size = Math.round(width*percent/100);
     var left = '', taken = '', i;
@@ -20,31 +20,188 @@ function progress(percent, width) {
     return '[' + taken + left + '] ' + percent + '%';
 }
 
+// Terminal code largely taken from https://github.com/pyodide/pyodide/blob/main/src/templates/console.html
+function sleep(s) {
+    return new Promise((resolve) => setTimeout(resolve, s));
+}
+
+function create_interpreter(pyodide: PyodideInterface, term: JQueryTerminal) {
+    let {repr_shorten, PyodideConsole} = pyodide.pyimport("pyodide.console");
+    const pyconsole = PyodideConsole(pyodide.globals);
+
+    const namespace = pyodide.globals.get("dict")();
+    const await_fut = pyodide.runPython(
+        `
+          import builtins
+          from pyodide.ffi import to_js
+
+          async def await_fut(fut):
+              res = await fut
+              if res is not None:
+                  builtins._ = res
+              return to_js([res], depth=1)
+
+          await_fut
+          `,
+        {globals: namespace},
+    );
+    namespace.destroy();
+
+    const echo = (msg, ...opts) => {
+        return term.echo(
+            msg
+                .replaceAll("]]", "]]")
+                .replaceAll("[[", "[["),
+            ...opts,
+        );
+    };
+
+    async function lock() {
+        let resolve;
+        const ready = term.ready;
+        term.ready = new Promise((res) => (resolve = res));
+        await ready;
+        return resolve;
+    }
+
+    const ps1 = ">>> ";
+    const ps2 = "... ";
+
+    async function interpreter(command, term: JQueryTerminal) {
+        const unlock = await lock();
+        term.pause();
+        // multiline should be split (useful when pasting)
+        for (const c of command.split("\n")) {
+            const escaped = c.replaceAll(/\u00a0/g, " ");
+            const fut = pyconsole.push(escaped);
+            term.set_prompt(fut.syntax_check === "incomplete" ? ps2 : ps1);
+            switch (fut.syntax_check) {
+                case "syntax-error":
+                    term.error(fut.formatted_error.trimEnd());
+                    continue;
+                case "incomplete":
+                    continue;
+                case "complete":
+                    break;
+                default:
+                    throw new Error(`Unexpected type ${ty}`);
+            }
+            // In JavaScript, await automatically also awaits any results of
+            // awaits, so if an async function returns a future, it will await
+            // the inner future too. This is not what we want so we
+            // temporarily put it into a list to protect it.
+            const wrapped = await_fut(fut);
+            // complete case, get result / error and print it.
+            try {
+                const [value] = await wrapped;
+                if (value !== undefined) {
+                    echo(
+                        repr_shorten.callKwargs(value, {
+                            separator: "\n<long output truncated>\n",
+                        }),
+                    );
+                }
+                if (value instanceof pyodide.ffi.PyProxy) {
+                    value.destroy();
+                }
+            } catch (e) {
+                if (e.constructor.name === "PythonError") {
+                    const message = fut.formatted_error || e.message;
+                    term.error(message.trimEnd());
+                } else {
+                    throw e;
+                }
+            } finally {
+                fut.destroy();
+                wrapped.destroy();
+            }
+        }
+        term.resume();
+        await sleep(10);
+        unlock();
+    }
+
+    pyconsole.stdout_callback = (s) => echo(s, { newline: false });
+    pyconsole.stderr_callback = (s) => {
+        term.error(s.trimEnd());
+    };
+
+    return interpreter;
+}
+
 export const PlaygroundTerminal: React.FC = () => {
     const terminalRef = useRef(null);
 
-    const {state} = useEnvironmentSetup();
+    const {state, pyodide} = useEnvironmentSetup();
+
+    const setupComplete = useRef<boolean>(false);
 
     useEffect(() => {
-        terminalRef.current.echo("Setting up environment");
-        terminalRef.current.freeze();
+        terminalRef.current.echo("Setting up environment...");
+        terminalRef.current.freeze(true);
+        terminalRef.current.setPrompt("");
     }, [])
 
     useEffect(() => {
-        if (state.pyodideStatus !== "done unpacking") {
+        if (state.environmentStatus === EnvironmentStatus.WaitBitbakeOrPyodide) {
+            let s = "";
+            switch (state.pyodideStatus) {
+                case PyodideStatus.Idle:
+                    s = "idle";
+                    break;
+                case PyodideStatus.Fetching:
+                    s = "fetching...";
+                    break;
+                case PyodideStatus.Loading:
+                    s = "loading...";
+                    break;
+                case PyodideStatus.Done:
+                    s = "done!";
+                    break;
+                case PyodideStatus.Inactive:
+                    s = "inactive";
+                    break;
+            }
+
             terminalRef.current.setPrompt(
-                `Downloading bitbake: ${progress(state.bitbakeProgress, 80)}%\nPyodide: ${state.pyodideStatus}`
+                `Downloading BitBake: ${progress(state.bitbakeProgress, 30)}%\nPyodide: ${s}`
             )
         } else {
-            terminalRef.current.setPrompt(
-                `Done unpacking BitBake`
-            )
-        }
-    }, [state]);
+            switch (state.environmentStatus) {
+                case EnvironmentStatus.UnpackingBitbake:
+                    terminalRef.current.setPrompt(
+                        `Unpacking BitBake...`
+                    )
+                    break;
+                case EnvironmentStatus.LoadingSqlite3:
+                    terminalRef.current.setPrompt(
+                        `Loading sqlite3...`
+                    )
+                    break;
+                case EnvironmentStatus.Configuring:
+                    terminalRef.current.setPrompt(
+                        `Installing import hooks...`
+                    )
+                    break;
+                case EnvironmentStatus.ImportingBitbake:
+                    terminalRef.current.setPrompt(
+                        `Importing BitBake...`
+                    )
+                    break;
+                case EnvironmentStatus.Ready:
+                    if (!setupComplete.current) {
+                        setupComplete.current = true;
 
-    const interpreter = (command, term) => {
+                        terminalRef.current.setInterpreter(create_interpreter(pyodide, terminalRef.current));
 
-    };
+                        terminalRef.current.echo("Ready :)\n");
+                        terminalRef.current.setPrompt(">>> ");
+                        terminalRef.current.freeze(false);
+                    }
+                    break;
+            }
+        }
+    }, [pyodide, state]);
 
-    return (<JQueryTerminal interpreter={interpreter} ref={terminalRef}/>)
+    return (<JQueryTerminal ref={terminalRef}/>)
 }

src/hooks/useEnvironmentSetup.ts

@@ -1,12 +1,26 @@
 import {useImmerReducer} from "use-immer";
-import {usePyodide} from "./usePyodide";
-import {useEffect} from "react";
+import {PyodideStatus, usePyodide} from "./usePyodide";
+import {useEffect, useRef} from "react";
 import {useSWRProgress} from "./useSWRProgress";
 
+export enum EnvironmentStatus {
+    WaitBitbakeOrPyodide,
+    LoadingSqlite3,
+    UnpackingBitbake,
+    Configuring,
+    ImportingBitbake,
+    Ready,
+}
 
+enum InternalStatus {
+    NotRun,
+    Running,
+    Done
+}
 
 const initialEnvironmentState = {
-    pyodideStatus: "idle",
+    environmentStatus: EnvironmentStatus.WaitBitbakeOrPyodide,
+    pyodideStatus: PyodideStatus.Idle,
     bitbakeProgress: 0
 };
 
@@ -18,6 +32,9 @@ function reducer(draft, action) {
         case "bitbakeProgressChanged":
             draft.bitbakeProgress = action.bitbakeProgress;
             return;
+        case "environmentStatusChanged":
+            draft.environmentStatus = action.environmentStatus;
+            break;
     }
 }
 
@@ -33,19 +50,21 @@ export const useEnvironmentSetup = () => {
 
     useEffect(() => {
         dispatch({type: "bitbakeProgressChanged", bitbakeProgress: progress});
-    }, [progress, dispatch]);
+    }, [dispatch, progress]);
+
+    const effectStatus = useRef<InternalStatus>(InternalStatus.NotRun);
 
     useEffect(() => {
-        if (pyodide && data) {
-            dispatch({type: "pyodideStatusChanged", pyodideStatus: "Loading sqlite3"});
+        if (pyodideStatus === PyodideStatus.Done && progress === 100 && effectStatus.current === InternalStatus.NotRun) {
+            effectStatus.current = InternalStatus.Running;
             const f = async() => {
+                dispatch({type: "environmentStatusChanged", environmentStatus: EnvironmentStatus.LoadingSqlite3});
                 await pyodide.loadPackage("sqlite3");
-                dispatch({type: "pyodideStatusChanged", pyodideStatus: "done sqlite3"});
-                dispatch({type: "pyodideStatusChanged", pyodideStatus: "Unpacking..."});
+                dispatch({type: "environmentStatusChanged", pyodideStatus: EnvironmentStatus.UnpackingBitbake});
                 pyodide.unpackArchive(data, "zip", {
                     extractDir: "bb"
                 });
-                dispatch({type: "pyodideStatusChanged", pyodideStatus: "done unpacking"});
+                dispatch({type: "environmentStatusChanged", pyodideStatus: EnvironmentStatus.Configuring});
 
                 pyodide.runPython(`
 import os.path
@@ -157,31 +176,34 @@ sys.meta_path.append(BuiltinImporterShim())
 
 print(sys.meta_path)
         `)
-                const file = pyodide.FS.readdir("./bb");
-                console.log(file);
+                // const file = pyodide.FS.readdir("./bb");
+                // console.log(file);
 
+                dispatch({type: "environmentStatusChanged", environmentStatus: EnvironmentStatus.ImportingBitbake});
                 pyodide.runPython(`
                     import sys
                     sys.path.insert(0, "./bb/bitbake-2.8.0/lib/")
                     from bb.data_smart import DataSmart    
                 `)
 
-                const DataSmart = pyodide.globals.get('DataSmart');
-                const d = DataSmart();
-
-                d.setVar("A", "B");
-                d.setVar("A:test", "C");
-                d.setVar("OVERRIDES", "test");
-                d.setVarFlag("A", "p", "OK");
-
-                console.log(d.getVar("A"));
-
-                DataSmart.destroy();
+                dispatch({type: "environmentStatusChanged", environmentStatus: EnvironmentStatus.Ready});
+                // const DataSmart = pyodide.globals.get('DataSmart');
+                // const d = DataSmart();
+                //
+                // d.setVar("A", "B");
+                // d.setVar("A:test", "C");
+                // d.setVar("OVERRIDES", "test");
+                // d.setVarFlag("A", "p", "OK");
+                //
+                // console.log(d.getVar("A"));
+                //
+                // DataSmart.destroy();
             }
 
             f();
+            effectStatus.current = InternalStatus.Done;
         }
-    }, [data, dispatch, pyodide]);
+    }, [data, dispatch, progress, pyodide, pyodideStatus]);
 
-    return {state};
+    return {state, pyodide};
 };

src/hooks/usePyodide.ts

@@ -4,20 +4,28 @@ import {PyodideInterface} from "pyodide";
 
 let cachedInstance: PyodideInterface = null;
 
-export const usePyodide: () => { pyodide: PyodideInterface; status: string } = () => {
+export enum PyodideStatus {
+    Idle,
+    Fetching,
+    Loading,
+    Done,
+    Inactive,
+}
+
+export const usePyodide: () => { pyodide: PyodideInterface; status: PyodideStatus } = () => {
     const [pyodide, setPyodide] = useState<PyodideInterface>(null);
-    const [status, setStatus] = useState<string>('idle');
+    const [status, setStatus] = useState<PyodideStatus>(PyodideStatus.Idle);
 
     useEffect(() => {
         let isActive = true;
 
         const loadPyodide = async () => {
             if (!cachedInstance) {
-                setStatus("importing");
+                setStatus(PyodideStatus.Fetching);
                 const { loadPyodide: loadPyodideModule } = await import("https://cdn.jsdelivr.net/pyodide/v0.25.1/full/pyodide.mjs");
-                setStatus("loading");
+                setStatus(PyodideStatus.Loading);
                 cachedInstance = await loadPyodideModule();
-                setStatus("done");
+                setStatus(PyodideStatus.Done);
             }
             if (isActive) {
                 setPyodide(cachedInstance);
@@ -27,7 +35,7 @@ export const usePyodide: () => { pyodide: PyodideInterface; status: string } = (
         loadPyodide();
 
         return () => {
-            setStatus("inactive");
+            setStatus(PyodideStatus.Inactive);
             isActive = false;
         };
     }, []);