theseus/extensions/docx-editor/panel.html

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feat(docx-editor): edit Word documents without quietly eating what Word put in them A .docx editor is easy to write badly: read the file into HTML, let someone edit it, write a fresh document back, and hand them a file that lost its headers, its page size and half its formatting without ever saying so. Three things keep this one honest. The reader doesn't use mammoth's HTML. mammoth's converter is deliberately semantic, and HTML has nowhere to put a run's colour or a paragraph's line spacing, so it drops them — and those are controls this editor puts in the ribbon. Taking its parsed document model instead means what the ribbon offers is what the file can actually carry. Six properties mammoth's model didn't keep are added by build-time patches, each asserting its anchor so an upgrade that moves the code fails the build rather than shipping a lossy reader. The writer rebuilds the body but carries the rest of the package across: headers, footers, footnotes, endnotes, the document's own style catalogue, its theme and its page setup, with relationship ids and content types re-wired. Word features the editor can't model are still lost, so they are detected when the file opens and named in a banner before anyone edits. Tracked changes get their own gate. mammoth renders insertions as ordinary text and drops deletions, so saving would accept every pending revision without Word ever asking. Such a document opens read-only until the user says that is what they want. Verified over 66 real documents: 65 round-trip with an identical model and a structurally valid package, the one exception being a 7 MB WMF picture, which no browser can display and the writer cannot emit. Also driven end to end through a real Theseus over CDP — sidebar, ribbon, typing, save, reopen.
2026-09-20 20:46:29 +02:00
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Word editor</title>
<style>
:root { color-scheme: light dark;
--bg:#0e131c; --panel:#141a24; --panel2:#191f2b; --line:rgba(255,255,255,.09);
--ink:#e7eaf1; --mut:#8b98a9; --dim:#5e6678; --acid:#d6ff3d; --danger:#ff5b5b; }
@media (prefers-color-scheme: light) {
:root { --bg:#f8faff; --panel:#ffffff; --panel2:#eff3fb; --line:rgba(0,0,0,.10);
--ink:#1a1f2b; --mut:#5c6577; --dim:#8a93a5; --acid:#0AC18E; }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--ink);
font: 13px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
display: flex; flex-direction: column; }
h1 { font-size: 13px; font-weight: 600; margin: 0; }
.head { display: flex; align-items: center; gap: 8px; padding: 10px 12px;
border-bottom: 1px solid var(--line); background: var(--panel); }
.head .ico { font-size: 15px; }
.body { flex: 1; overflow: auto; padding: 12px; }
.lede { color: var(--mut); font-size: 12px; margin: 0 0 12px; }
.btn { border: 1px solid var(--line); background: var(--panel2); color: var(--ink);
border-radius: 7px; cursor: pointer; padding: 8px 10px; font: inherit;
display: flex; align-items: center; gap: 8px; width: 100%; text-align: left; }
.btn:hover { border-color: rgb(from var(--acid) r g b / .55); }
.btn.primary { background: var(--acid); color: #101418; border-color: transparent; font-weight: 600; }
.btn.primary:hover { filter: brightness(1.06); }
.btn + .btn { margin-top: 8px; }
.btn .sub { display: block; font-size: 11px; color: var(--dim); font-weight: 400; }
.btn.primary .sub { color: rgba(16,20,24,.7); }
.drop { border: 1.5px dashed var(--line); border-radius: 8px; padding: 18px 12px;
text-align: center; color: var(--dim); font-size: 12px; margin: 12px 0; }
.drop.over { border-color: var(--acid); color: var(--ink); }
h2 { font-size: 11px; text-transform: uppercase; letter-spacing: .05em;
color: var(--dim); margin: 18px 0 8px; font-weight: 600; }
.doc { display: flex; align-items: center; gap: 8px; padding: 7px 8px;
border: 1px solid var(--line); border-radius: 7px; background: var(--panel);
margin-bottom: 6px; cursor: pointer; }
.doc:hover { border-color: rgb(from var(--acid) r g b / .5); }
.doc .meta { flex: 1; min-width: 0; }
.doc .name { font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc .when { font-size: 10.5px; color: var(--dim); }
.doc .x { border: 0; background: transparent; color: var(--dim); cursor: pointer;
font: inherit; padding: 2px 5px; border-radius: 5px; }
.doc .x:hover { color: var(--danger); background: var(--panel2); }
.tag { font-size: 9.5px; padding: 1px 5px; border-radius: 99px; border: 1px solid var(--line); color: var(--dim); }
.empty { color: var(--dim); font-size: 12px; padding: 6px 0; }
.foot { border-top: 1px solid var(--line); padding: 8px 12px; background: var(--panel);
font-size: 11px; color: var(--dim); display: flex; gap: 8px; align-items: center; }
.foot button { border: 1px solid var(--line); background: var(--panel2); color: var(--ink);
border-radius: 5px; cursor: pointer; padding: 3px 7px; font: inherit; font-size: 11px; }
.foot button:hover { border-color: rgb(from var(--acid) r g b / .55); }
.msg { min-height: 16px; font-size: 11.5px; color: var(--mut); margin-top: 8px; }
.msg.err { color: var(--danger); }
</style>
</head>
<body>
<div class="head"><span class="ico">📝</span><h1>Word editor</h1></div>
<div class="body">
<p class="lede">Open a .docx in a full tab. Headers, footers, footnotes, page setup and
the document's own styles survive a save; a few Word features don't, and the editor says
which before you start.</p>
<button class="btn primary" id="new">
<span>📄</span><span>New document<span class="sub">A blank page</span></span>
</button>
<button class="btn" id="open">
<span>📂</span><span>Open a .docx…<span class="sub">From this computer</span></span>
</button>
<div class="drop" id="drop">or drop a .docx here</div>
<h2>Recent</h2>
<div id="recent"><div class="empty">Nothing yet.</div></div>
<div class="msg" id="msg"></div>
</div>
<div class="foot">
<span style="flex:1">Documents are kept in a scratch folder.</span>
<button id="folder">Folder</button>
<button id="clear">Clear</button>
</div>
<input type="file" id="file" accept=".docx,application/vnd.openxmlformats-officedocument.wordprocessingml.document" hidden>
<script>
const $ = (id) => document.getElementById(id);
const SM = () => window.silentmode;
function say(text, err) {
const el = $("msg");
el.textContent = text || "";
el.classList.toggle("err", !!err);
clearTimeout(say._t);
if (text) say._t = setTimeout(() => { el.textContent = ""; el.classList.remove("err"); }, 6000);
}
function ago(ts) {
const s = Math.max(0, Math.round((Date.now() - ts) / 1000));
if (s < 60) return "just now";
if (s < 3600) return `${Math.round(s / 60)} min ago`;
if (s < 86400) return `${Math.round(s / 3600)} h ago`;
return new Date(ts).toLocaleDateString();
}
function bytesLabel(n) {
return n > 1048576 ? `${(n / 1048576).toFixed(1)} MB` : `${Math.max(1, Math.round(n / 1024))} KB`;
}
async function toBase64(file) {
const buf = new Uint8Array(await file.arrayBuffer());
let s = "";
for (let i = 0; i < buf.length; i += 0x8000) {
s += String.fromCharCode.apply(null, buf.subarray(i, i + 0x8000));
}
return btoa(s);
}
async function refresh() {
let list = [];
try { list = await SM().invoke("listRecent", {}); }
catch (e) { say("Couldn't read the recent list.", true); return; }
const host = $("recent");
host.innerHTML = "";
if (!list.length) {
host.innerHTML = '<div class="empty">Nothing yet.</div>';
return;
}
for (const d of list) {
const row = document.createElement("div");
row.className = "doc";
row.title = "Open in the editor";
const meta = document.createElement("div");
meta.className = "meta";
const name = document.createElement("div");
name.className = "name";
name.textContent = d.name;
const when = document.createElement("div");
when.className = "when";
when.textContent = `${ago(d.at)} · ${bytesLabel(d.bytes)}`;
if (d.kind === "saved") {
const tag = document.createElement("span");
tag.className = "tag";
tag.textContent = "autosaved";
when.append(" ", tag);
}
meta.append(name, when);
const x = document.createElement("button");
x.className = "x";
x.textContent = "✕";
x.title = "Forget this document";
x.addEventListener("click", async (e) => {
e.stopPropagation();
try { await SM().invoke("clearRecent", { id: d.id }); await refresh(); }
catch (err) { say("Couldn't remove it.", true); }
});
row.append(document.createTextNode("📄"), meta, x);
row.addEventListener("click", () => openEditor(d.id));
host.append(row);
}
}
async function openEditor(id) {
try { await SM().invoke("openEditor", id ? { id } : {}); }
catch (e) { say("Couldn't open the editor: " + (e && e.message || e), true); }
}
async function handleFile(file) {
if (!/\.docx$/i.test(file.name)) { say("That isn't a .docx file.", true); return; }
say("Opening…");
try {
const res = await SM().invoke("stash", { name: file.name, base64: await toBase64(file), kind: "opened" });
await openEditor(res.id);
await refresh();
say("");
} catch (e) {
say((e && e.message || e).toString(), true);
}
}
$("new").addEventListener("click", () => openEditor(""));
$("open").addEventListener("click", () => $("file").click());
$("file").addEventListener("change", async (e) => {
const f = e.target.files && e.target.files[0];
e.target.value = "";
if (f) await handleFile(f);
});
$("folder").addEventListener("click", async () => {
try { await SM().invoke("openFolder", {}); } catch (e) { say("Couldn't open the folder.", true); }
});
$("clear").addEventListener("click", async () => {
try { await SM().invoke("clearRecent", {}); await refresh(); say("Cleared."); }
catch (e) { say("Couldn't clear the list.", true); }
});
const drop = $("drop");
for (const type of ["dragenter", "dragover"]) {
drop.addEventListener(type, (e) => { e.preventDefault(); drop.classList.add("over"); });
}
for (const type of ["dragleave", "drop"]) {
drop.addEventListener(type, () => drop.classList.remove("over"));
}
drop.addEventListener("drop", async (e) => {
e.preventDefault();
const f = Array.from(e.dataTransfer?.files || [])[0];
if (f) await handleFile(f);
});
window.addEventListener("dragover", (e) => e.preventDefault());
window.addEventListener("drop", (e) => e.preventDefault());
document.addEventListener("visibilitychange", () => { if (!document.hidden) refresh(); });
refresh();
</script>
</body>
</html>