// src/web/public/terminal-tile.js /** * @fileoverview TerminalTile: one independent live terminal pane bound to one * session, with its own xterm instance and its own * `/ws/sessions/:id/terminal` WebSocket. The split pane (terminal-split.js) * uses one as its second pane ("Pane B"); the tile grid planned in * docs/tile-grid-plan.md reuses the same class for every tile. * * Deliberately plainer than the primary pane (this.terminal/this._ws in * terminal-ui.js): no local-echo overlay, no CJK IME, no touch/mobile * handlers, no keyboard accessory bar. Desktop-only by nature; see * docs/split-pane-sessions-plan.md. * * @dependency vendor/xterm.js, vendor/xterm-addon-fit.js * @dependency constants.js (window.CodemanTerminalFont, DEFAULT_SCROLLBACK, TERMINAL_TAIL_SIZE, TERMINAL_CHUNK_SIZE) * @dependency terminal-ui.js (codemanCurrentXtermTheme, codemanCurrentSkinIsLight) * @loadorder 7.4 of 16, loaded after terminal-ui.js and before terminal-split.js */ (function (global) { // How long a scroll-to-top history pull may hold Pane B's live output. const HISTORY_PULL_TIMEOUT_MS = 10000; /** * Minimal chunked write for Pane B's own xterm instance — write() in * TERMINAL_CHUNK_SIZE slices, yielding a frame between each, instead of one * giant synchronous write that blocks the main thread while parsing a long * scrollback. Deliberately NOT the primary pane's chunkedTerminalWrite * (terminal-ui.js): that one is wired into session-switch generation * counters and the live-output gate this simpler, independently * created/destroyed pane has no equivalent of. */ function writeChunked(terminal, buffer, isDestroyed) { if (!buffer) return Promise.resolve(); if (buffer.length <= TERMINAL_CHUNK_SIZE) { terminal.write(buffer); return Promise.resolve(); } // Resolves once the LAST chunk is written (or the pane was destroyed // mid-replay), so _loadBuffer() below can hold its single-flight flag // across the whole replay rather than just the fetch that precedes it. return new Promise((resolve) => { let offset = 0; const writeNext = () => { if (isDestroyed() || !terminal) { resolve(); return; } const chunk = buffer.slice(offset, offset + TERMINAL_CHUNK_SIZE); offset += chunk.length; terminal.write(chunk); if (offset < buffer.length) { if (typeof requestAnimationFrame === 'function') requestAnimationFrame(writeNext); else setTimeout(writeNext, 16); } else { resolve(); } }; writeNext(); }); } class TerminalTile { constructor(sessionId, mountEl, opts = {}) { this.sessionId = sessionId; this.mountEl = mountEl; this.sessionMode = opts.mode; this.fontSettings = opts.fontSettings || {}; // Live reference (not a snapshot) to the app's detachedSessions Set — // detaching this session AFTER the split is already open must still be // seen by _sendResize() below, or it re-creates the exact PTY-size // fight the split picker already refuses to open at pick time. this.detachedSessions = opts.detachedSessions; this.terminal = null; this.fitAddon = null; this.ws = null; this._wsReady = false; this._wsClosed = false; this._destroyed = false; // Single-flight state for _loadBuffer()/_refreshBuffer() below. this._bufferLoading = false; this._bufferRefreshPending = false; // Scroll-to-top history pull (shell panes only), see _maybeLoadMoreHistory(). // `_liveQueue` is non-null from the pull's response until its finally // block: live frames are held there with their arrival time instead of // written under the replay. `_markerOwed` is the "disconnected" marker a // load still has to write (see _onSocketClosed()/_stampMarkerIfOwed()). this._historyPullAt = 0; this._historyPullUseless = false; this._liveQueue = null; this._markerOwed = false; this._onWheel = null; // `{ ws, lastRecvAt }`, registered with the app's input-socket map while // this pane's socket is open, so the exactly-once input queue delivers this // session's keystrokes over it (app.js _inputSocketFor). Null otherwise. this._inputHandle = null; // Reconnect state. `_socketUrl` is set once connect() opens the first // socket: a pane that never connected has nothing to reconnect to. // `_reconnectAttempts` counts consecutive failed opens and is reset ONLY by // a successful open (resetting it per attempt is the tight-loop bug the // primary pane's _disconnectWs documents). `_stoppedCode` is the close code // that ended the pane for good; `onExit(code)` tells the owner once. this._socketUrl = null; this._reconnectAttempts = 0; this._reconnectTimer = null; this._stoppedCode = null; this._markerText = TerminalTile.MARKER_RECONNECTING; this.onExit = typeof opts.onExit === 'function' ? opts.onExit : null; // The `{ cols, rows }` last sent in a `{t:'z'}` frame, so an unchanged size // is not resent (each one costs a `tmux resize-window` and a SIGWINCH). // Cleared on every open: a fresh socket must announce its size, which is // also what registers it as a desktop viewer server-side. this._lastSentDims = null; // Whether the pointer is over a link in THIS pane (the primary pane's own // flag, app._linkHovered, belongs to its terminal alone). this._linkHovered = false; } async connect() { const savedFontSize = parseInt(localStorage.getItem('codeman-font-size'), 10); this.terminal = new Terminal({ theme: { ...global.codemanCurrentXtermTheme() }, fontFamily: global.CodemanTerminalFont.resolve(this.fontSettings.terminalFontFamily), ...global.CodemanTerminalFont.resolveWeights(this.fontSettings), fontSize: Number.isFinite(savedFontSize) ? savedFontSize : 14, lineHeight: 1.2, cursorBlink: false, cursorStyle: 'block', minimumContrastRatio: global.codemanCurrentSkinIsLight() ? 4.5 : 1, scrollback: DEFAULT_SCROLLBACK, allowTransparency: true, allowProposedApi: true, }); this.fitAddon = new FitAddon.FitAddon(); this.terminal.loadAddon(this.fitAddon); this.terminal.open(this.mountEl); this.fitAddon.fit(); // File paths and URLs printed here are clickable, through the SAME // provider as the primary pane (registerFilePathLinkProvider, // terminal-ui.js), and open against THIS pane's session. global.app?.registerFilePathLinkProvider?.({ terminal: this.terminal, getSessionId: () => this.sessionId, setHovered: (hovered) => { this._linkHovered = hovered; }, }); this._installWheelListener(); this.terminal.onData((data) => this._onTerminalData(data)); // Pane B has no gates of its own by default, so every app-level chord // that the document capture-phase handler (app.js) only preventDefault()s // — never stopPropagation()s — reaches xterm here too and writes its raw // byte/escape sequence into THIS session's PTY on top of whatever the app // action already did to Pane A (COD-153; mirrors the primary pane's own // gates at terminal-ui.js's attachCustomKeyEventHandler: command palette, // Alt+1-9/[/] tab nav, Alt+B sidebar toggle, Ctrl+Z suspend, Shift/Ctrl+Enter // newline, and smart-copy Ctrl+C/Ctrl+Shift+C). Routed through the same // registry-aware predicates so a rebind or a disable restores plain // terminal behavior here too. Ctrl+V goes through the primary pane's // paste trap (image-input.js), aimed at this pane (below). this.terminal.attachCustomKeyEventHandler((ev) => { if (ev.isComposing || ev.key === 'Process' || ev.keyCode === 229) return true; if ( ev.altKey && !ev.ctrlKey && !ev.shiftKey && /^(Digit[1-9]|BracketLeft|BracketRight|KeyK)$/.test(ev.code || '') ) { return false; } if (ev.type === 'keydown' && global.app?.shouldOpenCommandPaletteFromShortcut?.(ev)) { return false; } if (ev.type === 'keydown' && global.app?.shouldToggleSessionSidebarFromShortcut?.(ev)) { return false; } // Ctrl+V / Cmd+V: the primary pane's paste trap, aimed at THIS pane, so // a pasted image uploads to this pane's session and its path is typed // here, and pasted text goes into this xterm with its bracketed-paste // markers intact. Mirrors terminal-ui.js's own Ctrl+V gate; without it // xterm's default only ever pasted text. if ((ev.ctrlKey || ev.metaKey) && ev.key === 'v' && ev.type === 'keydown') { global.app?._handleImagePaste?.({ terminal: this.terminal, sessionId: this.sessionId }); return false; } // Ctrl+Z (SIGTSTP/job-control suspend): mirrors terminal-ui.js's own // swallow — in a plain shell session this is the user's own // job-control tool and must reach the PTY, but in every other mode // (claude/omp/pi/codex/...) it silently stops an unattended agent // loop dead. Pane B has its own PTY/session and must not send a // suspend into a non-shell one just because the primary pane's own // gate lives elsewhere. if ( ev.type === 'keydown' && ev.key.toLowerCase() === 'z' && ev.ctrlKey && !ev.altKey && !ev.metaKey && !ev.shiftKey && this.sessionMode !== 'shell' ) { return false; } // Shift+Enter / Ctrl+Enter: insert a newline instead of submitting. // Mirrors terminal-ui.js's own handling — xterm sends plain \r for // every Enter variant, so an Ink app (Claude Code) can't tell a // newline from a submit. Without this gate, Pane B's onData would // send that bare \r straight over the WS and submit an incomplete // prompt instead of adding a line to it. Targets THIS pane's own // session (this.sessionId), never the primary pane's // activeSessionId, and has no local-echo overlay of its own to flush // first (Pane B is deliberately plainer — see the fileoverview). // Swallow keypress/keyup too (xterm would send \r for a Shift-only keypress); only keydown sends. if (ev.key === 'Enter' && (ev.shiftKey || ev.ctrlKey)) { if (ev.type === 'keydown') { fetch(`/api/sessions/${this.sessionId}/send-key`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ key: ev.ctrlKey ? 'C-Enter' : 'S-Enter' }), }).catch(() => { /* Best-effort, matching this pane's tolerance elsewhere. */ }); } return false; } // Smart copy (mirrors terminal-ui.js's Ctrl+C gate, #211): with a // selection, Ctrl+C copies THIS pane's own selection instead of // sending ^C; with none, plain Ctrl+C must fall through unchanged or // the interrupt key is lost. Ctrl+Shift+C is different: it is the // explicit, never-falls-through copy chord, and the predicate above // does not distinguish it from plain Ctrl+C — ev.shiftKey does, below. // xterm's own evaluateKeyboardEvent routes a shifted ctrl-letter into // a branch that assigns c.key only for a couple of special cases // ("_"->US, "@"->NUL), neither of which is "c", so it emits NOTHING // for Ctrl+Shift+C either way — this is not about an accidental // interrupt byte reaching the PTY (verified live: it does not). // Gating this whole block on hasSelection() (an earlier draft) meant // that with no selection Ctrl+Shift+C skipped straight to `return // true`, silently ceding the keystroke to the BROWSER's own handling // (e.g. Chrome's Inspect-Element binding) with no feedback and no // attempt to copy, unlike Pane A, which always intercepts it. // Re-implemented against this.terminal rather than reusing // app.copyTerminalSelection(), which reads app.terminal — Pane A's — // and would copy the wrong pane's selection. if (ev.type === 'keydown' && global.app?.shouldCopyTerminalSelectionFromShortcut?.(ev)) { const raw = this.terminal?.getSelection?.() || ''; const isColumnSelection = this.terminal?._core?._selectionService?._activeSelectionMode === 3; // Both clean options are read for THIS pane, never the primary one: // the gutter width comes from this.sessionId's own run mode, and the // partial-first-line flag from this terminal's own selection range. // Passing neither left Pane B keeping a margin Pane A dropped, on the // same split and the same keystroke. const range = global.app?._normalisedSelectionRange?.(this.terminal); const selection = isColumnSelection ? raw : (global.CodemanCopySelection?.clean?.(raw, { margin: global.app?._cliGutterColumns?.(this.sessionId) ?? 0, firstLinePartial: !!range && range.start.x > 0, }) ?? raw); if (selection.trim()) { ev.preventDefault(); void global.app._copyText?.(selection).then((ok) => { this.terminal?.clearSelection?.(); global.app.showToast?.(ok ? 'Copied to clipboard' : 'Failed to copy', ok ? 'success' : 'error'); }); return false; } // Nothing worth copying — clear for feedback (a padding-only // selection cleans to '' and this press still falls through to the // PTY as 0x03, matching the primary pane's own rule). if (this.terminal?.hasSelection?.()) { this.terminal.clearSelection?.(); global.app.showToast?.('Nothing to copy', 'warning'); } // Ctrl+Shift+C never falls through, even with nothing to copy — // matches terminal-ui.js's own ev.shiftKey branch. if (ev.shiftKey) { ev.preventDefault(); return false; } } return true; }); // Load existing scrollback before going live. The WS below is // subscribe-only (ws-routes.ts sends nothing on connect, only future // 'terminal' events), so without this Pane B stays blank until the // target session happens to produce new output. It LOOKED // intermittent rather than always-broken because _sendResize() below // often nudges the shared session's real tmux window to a new size, // and tmux repaints its current screen on resize — that repaint was // getting captured and streamed here, incidentally populating the // pane. When Pane B's computed dimensions happened to already match // the session's last-known size, Session.resize() (session.ts) skips // the resize as a no-op, no repaint fires, and the pane stayed blank. // The await covers the whole chunked replay, not just the fetch, so a // live frame from the socket below can never land in the middle of it. await this._loadBuffer(); if (this._destroyed) return; const proto = location.protocol === 'https:' ? 'wss:' : 'ws:'; // The tab's own connection identity plus a `:tile` suffix. The server // supersedes a socket that reuses a cid on the same session (4010), so a // pane must never share the primary pane's exact cid: were both ever on // one session they would evict each other in a loop. Input frames still // carry the BARE clientId, which is what the server dedups on. const app = global.app; const cid = app?._clientId ? `${app._clientId}:${app._wsTabNonce}:tile` : ''; const cidQuery = cid ? `?cid=${encodeURIComponent(cid)}` : ''; this._socketUrl = `${proto}//${location.host}${window.CodemanBase.base}/ws/sessions/${this.sessionId}/terminal${cidQuery}`; this._openSocket(); } // Opens a socket and makes it THE socket. A previous one is detached first // (handlers nulled, then closed), and every handler below checks it still // belongs to the current socket: a replacement opened while the old socket // still looked alive (a half-open connection whose close has not landed) // makes the server supersede the old one with a 4010, and that late close // must not stop a pane that is already running on its successor. _openSocket() { if (this._destroyed || !this._socketUrl) return; this._detachSocket(); const ws = new WebSocket(this._socketUrl); this.ws = ws; ws.onopen = () => { if (ws !== this.ws) return; this._onSocketOpen(); }; ws.onmessage = (event) => { if (ws !== this.ws) return; if (this._inputHandle) this._inputHandle.lastRecvAt = Date.now(); try { const msg = JSON.parse(event.data); if (msg.t === 'o') { this._onLiveOutput(msg.d); } else if (msg.t === 'c') { this._onLiveClear(); } else if (msg.t === 'r') { // Server-triggered refresh (SSE backpressure cleared, terminal // data was dropped). The primary pane routes this to // _onSessionNeedsRefresh (app.js) — Pane B has its own // buffer loader for the same reason connect() does. this._refreshBuffer(); } else if (msg.t === 'ia') { // Input ACK. The frame names no session, so it is this pane's. global.app?._onWsInputAck?.(msg.seq, msg, this.sessionId); } else if (msg.t === 'zc') { this._onPtyGeometryReport(msg.c, msg.r); } } catch { /* Malformed frame — ignore, matches primary pane's tolerance. */ } }; // _wsReady must go false on a drop or fit()/_sendResize() silently // no-op on a closed socket per the WebSocket spec (no exception, no log). // Input is not lost meanwhile: it waits in the app's durable queue and // goes out over HTTP or the next socket. The "disconnected" marker says // so on screen, and a transient close reconnects (_onSocketClosed). ws.onclose = (event) => { if (ws !== this.ws) return; this._onSocketClosed(event); }; ws.onerror = () => { // onclose fires after onerror — cleanup happens there. }; } // Lets go of the current socket without running its close handling. _detachSocket() { const ws = this.ws; if (!ws) return; ws.onopen = null; ws.onmessage = null; // onclose fires asynchronously AFTER close(); without this it ran its // "disconnected" write against a pane already torn down or replaced. ws.onclose = null; ws.onerror = null; try { ws.close(); } catch { /* Already closed. */ } this.ws = null; this._wsReady = false; this._unregisterInputSocket(); } // A socket came up. After a drop this is a reconnect: the gap left nothing // to replay (output frames carry no sequence number), so the buffer is // refreshed. The closed state is reset FIRST, or the refresh would re-owe // the "disconnected" marker (_refreshBuffer does on a closed socket) and // stamp it under a healthy pane. _onSocketOpen() { const reconnected = this._wsClosed; this._wsReady = true; this._wsClosed = false; this._markerOwed = false; this._reconnectAttempts = 0; this._lastSentDims = null; this._registerInputSocket(); this._sendResize(); if (reconnected) this._refreshBuffer(); } // Opens a replacement socket now instead of waiting out the backoff (for an // owner that just learned the server is back). No-op while the current // socket is open, after a permanent stop, or once destroyed. reconnectNow() { if (this._destroyed || this._stoppedCode !== null || !this._socketUrl) return; if (this.ws && this.ws.readyState === WebSocket.OPEN) return; clearTimeout(this._reconnectTimer); this._reconnectTimer = null; this._openSocket(); } // The socket's close, split out of connect() so the tests can drive it. // While any load runs (a history pull or a `{t:'r'}` refresh) the marker is // only owed, and that load's finally block settles it (_stampMarkerIfOwed()): // written now, it would sit above the output a pull is still holding (flushed // after it on a skip, a downgrade or a failed fetch), above a refresh's // replay, or in the middle of a chunked replay. A pull still waiting for its // response holds the marker too, for as long as the request takes (up to its // budget, see _pullHistory()). // // Then decides what comes next. Codes that cannot get better stop the pane // for good and report once through `onExit(code)`: 4004/4009 (the session // is gone), 4003 (refused: Host/Origin/owner, a retry gets the same answer) // and 4010 (another socket with this pane's cid took over; only ever // reaches here for the CURRENT socket, see _openSocket). Everything else, // including the redelivery sweep force-closing a silent socket (1005), is // transient and reconnects on the primary pane's backoff ladder // (CodemanWsReconnect, constants.js) plus jitter. _onSocketClosed(event) { this._wsReady = false; this._wsClosed = true; this._unregisterInputSocket(); const code = event?.code; const permanent = TerminalTile.STOP_MARKERS[code]; this._markerText = permanent || TerminalTile.MARKER_RECONNECTING; if (this._bufferLoading) this._markerOwed = true; else this._writeDisconnectedMarker(); if (this._destroyed) return; if (permanent) { this._stop(code); return; } this._scheduleReconnect(code); } _scheduleReconnect(code) { if (this._destroyed || !this._socketUrl || this._reconnectTimer) return; const plan = global.CodemanWsReconnect?.plan?.(code ?? 1006, this._reconnectAttempts) || { action: 'reconnect', delayMs: 1000, }; if (plan.action === 'give-up') { this._stop(code); return; } this._reconnectAttempts++; const delay = plan.delayMs + Math.floor(Math.random() * 250); // jitter: tiles must not reconnect in lockstep this._reconnectTimer = setTimeout(() => { this._reconnectTimer = null; this._openSocket(); }, delay); } _stop(code) { if (this._stoppedCode !== null) return; this._stoppedCode = code ?? null; clearTimeout(this._reconnectTimer); this._reconnectTimer = null; if (!this._destroyed) this.onExit?.(code); } // Keystrokes and pastes go through the app's exactly-once input queue (seq, // ACK, persisted until delivered, redelivered after a drop), over this // pane's own socket while it is open and the HTTP fallback while it is not. // What xterm GENERATES must not be queued: a query reply (DA/CPR/OSC) is // dropped, as the primary pane drops it, because forwarding it types // "0;276;0c" into the CLI, and replaying one after a reload would do so // again into a later screen. A focus or mouse report is real input the // program asked for, but nobody typed it: it goes out once, never // persisted. Same predicates as the primary pane (terminal-ui.js onData). _onTerminalData(data) { const input = global.CodemanTerminalInput; if (input?.shouldSuppressTerminalQueryResponse?.(data)) return; const app = global.app; if (input?.isTerminalFocusOrMouseReport?.(data)) { app?._sendInputEphemeral?.(this.sessionId, data); return; } app?._sendInputAsync?.(this.sessionId, data); } // Joins the app's input-socket map for this session and flushes anything // already queued for it (typed while the socket was down, or left over from // a reload) over the fresh socket. Called from onopen. _registerInputSocket() { const app = global.app; if (!this.ws || !app?._registerInputSocket) return; this._unregisterInputSocket(); this._inputHandle = { ws: this.ws, lastRecvAt: 0 }; app._registerInputSocket(this.sessionId, this._inputHandle); app._onWsReady?.(this.sessionId); } // Leaves the map; only this pane's own handle is removed (a replacement // socket's registration survives a late close of the old one). _unregisterInputSocket() { if (!this._inputHandle) return; global.app?._unregisterInputSocket?.(this.sessionId, this._inputHandle); this._inputHandle = null; } // Settles a marker the pane owes: set when a close lands during a load (the // replay would otherwise sit below it) or when a load wipes the terminal on // a closed socket. Called from each load's own finally, just before // _endBufferLoad() starts any trailing refresh. _stampMarkerIfOwed() { // A trailing refresh is about to clear() synchronously, while xterm parses // a write() on a later tick: a marker written here would land in the // freshly cleared buffer ABOVE that refresh's replay, a second, stale copy. // The refresh re-owes the marker on a closed socket and stamps it itself. if (this._bufferRefreshPending && !this._destroyed) return; const owed = this._markerOwed; this._markerOwed = false; if (owed && this._wsClosed && !this._destroyed) this._writeDisconnectedMarker(); } // Extracted so both _onSocketClosed() and a load that ends owing it on a // closed socket can write it (see _stampMarkerIfOwed()). _writeDisconnectedMarker() { this.terminal?.write(`\r\n\x1b[2m${this._markerText}\x1b[0m\r\n`); } // Fetches and writes the session's current scrollback. Used both by // connect() (initial load) and by the `{t:'r'}` server-refresh frame // (below) — the primary pane's own _onSessionNeedsRefresh (app.js) is // scoped to `this.activeSessionId` and clears/rewrites the primary // terminal, neither of which applies to this independent pane, so this is // a standalone equivalent rather than a call into it. // // Mirrors the primary pane's own mode check (app.js's selectSession / // _onSessionNeedsRefresh): a shell session can retain hundreds of // thousands of plain scrollback lines, so pulling `?full=1` there parses // an unbounded, server-capped (up to terminalBufferMaxBytes, 32MB) body // into a 50000-line xterm on every load. Non-shell (TUI) sessions still // get one full replay. `fetch` here goes through the global wrapper // (constants.js), which already prefixes CodemanBase — unlike the raw // WebSocket URL above, which does not. // // Single-flight: the flag is held across the fetch AND the chunked write // (writeChunked resolves after its last chunk), so two replays can never // interleave their chunks into one terminal. A second call while one is // in flight is dropped here; _refreshBuffer() is the caller that queues // a trailing re-run instead. async _loadBuffer() { if (this._bufferLoading) return; this._bufferLoading = true; try { const query = this.sessionMode === 'shell' ? `tail=${TERMINAL_TAIL_SIZE}` : 'full=1'; const res = await fetch(`/api/sessions/${this.sessionId}/terminal?${query}`); const payload = (await res.json())?.data ?? {}; if (payload.terminalBuffer && this.terminal) { await writeChunked(this.terminal, payload.terminalBuffer, () => this._destroyed); } } catch { /* Best-effort — live output still arrives once the socket connects. */ } finally { this._stampMarkerIfOwed(); this._endBufferLoad(); } } // Ends a single-flight load (initial, refresh or history pull): clears the // flag, then runs the ONE trailing refresh that arrived while it was busy. _endBufferLoad() { this._bufferLoading = false; if (this._bufferRefreshPending && !this._destroyed) { this._bufferRefreshPending = false; this._refreshBuffer(); } } // Live terminal output. Written straight through, except while a history // pull is replaying: a capture is current only up to the instant tmux took // it, so a frame arriving mid-replay is held with its arrival time and // replayed behind the snapshot by _pullHistory() (the primary pane's // _finishBufferLoad `since` rule), never written underneath it. _onLiveOutput(data) { if (this._liveQueue) this._liveQueue.push({ at: performance.now(), data }); else this.terminal?.write(data); } // The server's `{t:'c'}` clear frame takes the same route as output, for the // same reason: clearing straight away, mid-replay, would wipe the half-written // snapshot and leave _pullHistory() measuring a buffer that is no longer the // one it is restoring. Queued, it lands in order with the frames around it. _onLiveClear() { if (this._liveQueue) this._liveQueue.push({ at: performance.now(), clear: true }); else this.terminal?.clear(); } // Capture phase, because xterm's own wheel handler stopPropagation()s every // event it consumes, so a bubbling listener here would never see the wheel // while the pane still has scrollback to scroll. Passive: this only observes, // xterm keeps doing the scrolling. _installWheelListener() { this._onWheel = (ev) => { if (ev.deltaY < 0) this._maybeLoadMoreHistory(); }; this.mountEl.addEventListener('wheel', this._onWheel, { capture: true, passive: true }); } // Wheel-up at the top of a SHELL pane's scrollback. tmux repaints a burst of // output (`cat` of a file longer than the screen) instead of scrolling it, // so this pane's xterm ends up with about one screen of scrollback while // tmux holds every line — and nothing here ever went back to ask, so the // history was unreachable. The primary pane has the same pull // (app.js _maybeRefetchFullHistory); Pane B is a separate xterm and needs its // own. Shell only: a non-shell CLI's history is out of scope for this pull // (its load already takes `full=1`; codex and Claude's inline renderer do // grow tmux history, this just isn't how they recover it). The alternate- // screen skip (nano, vim, less) only matters for a direct-PTY shell — under // tmux the browser xterm never enters the alternate buffer. _maybeLoadMoreHistory() { if (this.sessionMode !== 'shell' || this._destroyed || !this.terminal) return; if (this._bufferLoading) return; // Mirrors app.js _maybeRefetchFullHistory and this pane's own // _sendResize(): a detached session's own window already owns its PTY // size and scrollback, so Pane B has nothing of its own to reconcile. if (this.detachedSessions?.has(this.sessionId)) return; const active = this.terminal.buffer.active; if (active.type !== 'normal' || active.viewportY !== 0) return; // Momentum scrolling fires this dozens of times per flick, so cooldown // rather than latch; a pull that could only have downgraded the pane // waits far longer. const cooldown = this._historyPullUseless ? 60000 : 4000; const now = Date.now(); if (now - this._historyPullAt < cooldown) return; this._historyPullAt = now; void this._pullHistory(); } // Pulls a BOUNDED window of tmux's full history (the same TERMINAL_TAIL_SIZE // a tab switch loads, so a multi-megabyte capture never lands on xterm's // main thread) and replays it under the reader's current place. Holds the // single-flight flag across the fetch AND the replay, like _loadBuffer(). async _pullHistory() { this._bufferLoading = true; let replayed = false; let capturedAt = 0; // Two budgets on one signal. The request itself gets the primary pane's // (CodemanFetchDeadline, constants.js): live output is not held while it // runs, but the single-flight flag is, so a coalesced `{t:'r'}` refresh and // the marker owed by a close (_onSocketClosed()) both wait for it, at worst // for that whole budget. Once the headers land live output IS held, so the // body read gets the short one instead: a body that hangs would otherwise // freeze the pane for the long budget. Aborting lands in the catch below, // which releases the flag and the queue. AbortSignal.timeout() alone cannot // be re-armed, hence the controller; without AbortController the pull // simply has no deadline. const controller = global.AbortController ? new global.AbortController() : null; let abortTimer = null; const armDeadline = (ms) => { if (!controller) return; clearTimeout(abortTimer); abortTimer = setTimeout(() => controller.abort(), ms); }; try { armDeadline(global.CodemanFetchDeadline?.terminalFetchDeadlineMs?.({ full: true }) ?? HISTORY_PULL_TIMEOUT_MS); const res = await fetch(`/api/sessions/${this.sessionId}/terminal?full=1&tail=${TERMINAL_TAIL_SIZE}`, { signal: controller?.signal, }); armDeadline(HISTORY_PULL_TIMEOUT_MS); // The cutoff below is the response's arrival, the same `since` rule the // primary pane uses (_finishBufferLoad). It is a client clock standing in // for the instant tmux took the capture, which lies somewhere in the // round trip, so a frame in that window can be lost or doubled. Bounded // by one round trip and not closable without a server-side capture time. capturedAt = performance.now(); // Opened only now: a frame from before the response is either replaced by // the capture or written unchanged, so holding it for the round trip // bought nothing and froze the pane for as long as the fetch took. this._liveQueue = []; const payload = (await res.json())?.data; clearTimeout(abortTimer); const buffer = payload?.terminalBuffer; const term = this.terminal; if (!buffer || !term || this._destroyed) return; const rowsBefore = term.buffer.active.length; const rowsIncoming = global.app?._estimateReplayRows?.(buffer, term.cols) ?? buffer.split('\n').length; // xterm keeps at most `scrollback + rows` rows while tmux keeps far more // lines, so a window of short lines can carry more rows than this pane // can ever hold, and `rowsIncoming <= rowsBefore` would never come true. const scrollbackCap = term.options?.scrollback || 0; const paneFull = scrollbackCap > 0 && rowsBefore >= scrollbackCap + term.rows; // Nothing to gain (this also covers a downgrade, which would delete // history mid-scroll), and a reset+rewrite would jump the viewport. An // untruncated window IS all of tmux's history and the next burst can add // more, so keep the 4 s cooldown. A truncated window can never reach past // what the pane shows, and every ask costs the server a capture-pane of // the whole history (`tail` is cut after it): back off to 60 s, as the // primary pane does (app.js _maybeRefetchFullHistory). A full pane backs // off too, since no window can ever fit in it. if (rowsIncoming <= rowsBefore || paneFull) { if (payload.truncated || paneFull) this._historyPullUseless = true; return; } this._historyPullUseless = false; term.write('\x1bc'); replayed = true; if (this._wsClosed) this._markerOwed = true; await writeChunked(term, buffer, () => this._destroyed); if (this._destroyed || !this.terminal) return; // xterm parses asynchronously: an empty write's callback fires only // after everything before it, so the row count below is the settled one. await new Promise((resolve) => this.terminal.write('', resolve)); if (this._destroyed || !this.terminal) return; // The replay grew the buffer UPWARD, so what was row 0 is now `delta` // rows down; land there and the recovered history sits above it. const delta = this.terminal.buffer.active.length - rowsBefore; if (delta > 0) this.terminal.scrollToLine(delta); else this.terminal.scrollToTop(); } catch { /* Best-effort — live output keeps arriving whatever happens here. */ } finally { clearTimeout(abortTimer); const queued = this._liveQueue ?? []; this._liveQueue = null; // After a replay, only frames that arrived after the capture are news; // earlier ones are already in it. With no replay, every held frame is. const cutoff = replayed ? capturedAt : 0; for (const entry of queued) { if (entry.at < cutoff) continue; if (entry.clear) this.terminal?.clear(); else this.terminal?.write(entry.data); } // Settled after the queue flush so the marker is the last thing on // screen: a close during the pull wrote nothing (_onSocketClosed() defers // it while a load runs), and a replay's own `\x1bc` (flagged above) wipes // one written before it, which would paint a fresh, current-looking // history while onData keeps silently dropping every keystroke on the // dead socket. With a trailing refresh pending (_endBufferLoad) the marker // is left to that refresh, which writes it below its own replay. this._stampMarkerIfOwed(); this._endBufferLoad(); } } // The `{t:'r'}` server-refresh path: clear, then replay. Two refresh // frames in a row used to start two concurrent replays, each clearing // the terminal under the other's chunked write. A refresh that arrives // mid-replay is COALESCED into one trailing re-run rather than ignored: // the in-flight fetch may predate the drop the new frame is reporting, // and no further frame is coming to correct stale content. _refreshBuffer() { if (this._bufferLoading) { this._bufferRefreshPending = true; return; } this.terminal?.clear(); // The clear wipes a "disconnected" marker (a `{t:'r'}` frame can queue a // trailing refresh behind a pull that the socket's close then interrupts), // so a refresh on a closed socket owes it back once its replay is written. if (this._wsClosed) this._markerOwed = true; void this._loadBuffer(); } // Local reflow only — no PTY resize frame. Split out so a divider drag // can reflow both panes at the browser's paint rate (rAF) while sending // the actual `{t:'z'}` resize once, at drag end, matching the primary // pane's own convention (throttledResize in terminal-ui.js). localFit() { if (!this.fitAddon) return; this.fitAddon.fit(); } // Reflow to the container and tell the PTY, as one step: the xterm and the // PTY must never disagree about size (#464), and a font change is a size // change too, so the font setters call this rather than localFit(). // `force` resends an unchanged size. fit({ force = false } = {}) { this.localFit(); this._sendResize({ force }); } _sendResize({ force = false } = {}) { if (!this._wsReady || !this.fitAddon || !this.terminal) return; // One PTY cannot hold two sizes (mirrors sendResize's own // detachedElsewhere yield in terminal-ui.js): the session got detached // to its own window AFTER this split was opened, so its own window now // owns the PTY's size and Pane B must stand aside. if (this.detachedSessions?.has(this.sessionId)) return; // A hidden pane (a web tab over it, a zoomed neighbour) measures NaN, and // fit() then leaves the xterm alone: there is no size worth reporting. const dims = this.fitAddon.proposeDimensions(); if (!dims || !Number.isFinite(dims.cols) || !Number.isFinite(dims.rows)) return; // Report what the xterm actually holds, so the PTY gets exactly the size // the pane renders at. Unclamped, unlike the primary pane's 40x10 floor: // a floor here misreported Pane B's width at the divider's reachable 20% // position (about 28 columns), causing real output-wrapping bugs, and a // floored xterm would be wider than its container. The server enforces // its own valid range ([1,500]/[1,200] in ws-routes.ts). const cols = this.terminal.cols; const rows = this.terminal.rows; const last = this._lastSentDims; if (!force && last && last.cols === cols && last.rows === rows) return; this._lastSentDims = { cols, rows }; this.ws.send(JSON.stringify({ t: 'z', c: cols, r: rows, v: 'desktop' })); } // The geometry the PTY actually holds (`{t:'zc'}`, the server's answer to // every resize). A PTY and a terminal that disagree on WIDTH render // garbled, so a different column count is adopted; rows stay local, as in // the primary pane (_onPtyGeometryReport in terminal-ui.js, #464). The // pure verdict is the primary's too (reconcilePtyGeometry, constants.js). _onPtyGeometryReport(cols, rows) { const terminal = this.terminal; if (!terminal) return; const verdict = global.CodemanTerminalGeometry?.reconcilePtyGeometry?.( { cols: terminal.cols, rows: terminal.rows }, { cols, rows } ); if (!verdict?.adopt) return; terminal.resize(verdict.cols, terminal.rows); this._lastSentDims = { cols: verdict.cols, rows: terminal.rows }; } destroy() { this._destroyed = true; // Anything still queued for this session stays in the app's queue and is // delivered over HTTP by the redelivery sweep, so closing the pane mid- // keystroke loses nothing. clearTimeout(this._reconnectTimer); this._reconnectTimer = null; if (this._onWheel) { this.mountEl?.removeEventListener('wheel', this._onWheel, { capture: true }); this._onWheel = null; } this._detachSocket(); if (this.terminal) { this.terminal.dispose(); this.terminal = null; } this.fitAddon = null; } } // The marker a pane writes when its socket drops: a transient drop says it is // reconnecting; a permanent stop says why, keyed by close code. All start // with `[disconnected` so a reader (and a test) can tell any of them apart // from session output. TerminalTile.MARKER_RECONNECTING = '[disconnected, reconnecting…]'; TerminalTile.STOP_MARKERS = { 4003: '[disconnected: the server refused this connection]', 4004: '[disconnected: the session ended]', 4009: '[disconnected: the session ended]', 4010: '[disconnected: another connection took over this pane]', }; global.TerminalTile = TerminalTile; })(window);