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React to URL fragment changes while the app is open. #13

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Merged
merged 1 commit into from
Oct 14, 2025
Merged

React to URL fragment changes while the app is open. #13

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33 changes: 30 additions & 3 deletions src/app.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ async function decodeShareFragment(hashQuery: string): Promise<SharePayload> {
}
}

async function stealHashQuery() {
function stealHashQuery() {
const { hash } = window.location;
if (hash !== '') {
history.replaceState(null, '', ' '); // remove #... from URL entirely
Expand All @@ -116,8 +116,6 @@ async function stealHashQuery() {
}
}

const query: { av?: string, s?: string } | undefined = await stealHashQuery();

interface TerminalChunk {
stream: 'stdout' | 'stderr';
text: string;
Expand All @@ -128,6 +126,8 @@ function TerminalOutput(key: string, output: TerminalChunk[]) {
<span key={`${key}-${index}`} className={`terminal-${chunk.stream}`}>{chunk.text}</span>);
}

const query = await stealHashQuery();

function AppContent() {
const {mode, setMode} = useColorScheme();
useEffect(() => monaco.editor.setTheme(mode === 'light' ? 'vs' : 'vs-dark'), [mode]);
Expand Down Expand Up @@ -162,6 +162,33 @@ function AppContent() {
const verilogProductEditorState = useRef(new EditorState(verilogProduct, null, 'verilog'));
useEffect(() => { verilogProductEditorState.current.text = verilogProduct ?? ''; }, [verilogProduct]);

const processSharePayload = React.useCallback((payload: SharePayload) => {
setAmaranthVersion(payload.av);
amaranthSourceEditorState.current.text = payload.s;
if (activeTab === 'tutorial') {
setActiveTab('amaranth-source');
}
}, [activeTab]);

const processSharePayloadRef = useRef(processSharePayload);
processSharePayloadRef.current = processSharePayload;

useEffect(() => {
let listener_ac = new AbortController();
let handler_ac: AbortController | undefined;
window.addEventListener('hashchange', async () => {
handler_ac?.abort();
handler_ac = new AbortController();
let result = await stealHashQuery();
handler_ac.signal.throwIfAborted();
if (result) processSharePayloadRef.current(result);
}, { signal: listener_ac.signal });
return () => {
listener_ac.abort();
handler_ac?.abort();
};
}, []);

function loadDemoCode() {
amaranthSourceEditorState.current.text = data.demoCode[amaranthVersion];
setActiveTab('amaranth-source');
Expand Down