Files
web-terminal/public/tabs.ts
Yaojia Wang edbfc62f7f fix(v0.4): full-screen per device — latest-writer-wins PTY sizing
A shared PTY can only be one size; min-sizing clamped the shared session to the
SMALLEST viewer, so a wide desktop got letterboxed when an iPad was also attached
(iPad looked full-screen, desktop did not).

Switch to latest-writer-wins: the device that most recently fit/focused drives the
PTY size, so whichever device you're actively using is full-screen.
- session.ts: setClientDims resizes the PTY directly (drop min across clients);
  attach/detach/blur never resize (the active device keeps its size)
- frontend: TerminalSession.refit() force-resends dims; window 'focus' /
  visibilitychange re-assert the active tab's size, so switching devices reclaims
  full-screen
- tests updated for latest-wins (incl. join/hidden/blur don't resize)

Verified (two ws clients): 200x50 → iPad 100x40 → desktop refit 200x50 → iPad blur
keeps 200x50. 225 tests green.
2026-06-19 11:16:59 +02:00

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/**
* public/tabs.ts — multi-tab manager + tab bar UI.
*
* Each tab owns an independent TerminalSession (own WS + server session).
*
* Titles: auto from the terminal (current folder, via folderFromTitle) →
* double-click to rename inline → falls back to "Term N". Manual wins.
* Interaction: pointerdown to switch (robust with draggable), drag to reorder,
* middle-click / × to close, status dot (connection color), unread dot.
*
* DOM is built once per tab and updated in place. A full rebuild happens ONLY
* on structural changes (add / close / reorder / rename) — never on a plain
* activate or on background output — so clicks are never eaten by a re-render.
*
* Closing a tab only disconnects its WS (a *detach*); the server PTY keeps
* running and is reclaimed by IDLE_TTL.
*/
import { TerminalSession } from './terminal-session.js'
import { THEMES, DEFAULT_SETTINGS, type Settings } from './settings.js'
const TABS_KEY = 'web-terminal:tabs'
const ACTIVE_KEY = 'web-terminal:active'
const LEGACY_KEY = 'web-terminal:sessionId' // single-session key from v0.1
interface TabEntry {
session: TerminalSession
customTitle: string | null // user-set; null = use auto/fallback (persisted)
autoTitle: string | null // current folder from the terminal title
hasActivity: boolean // inactive tab got output since last viewed
el: HTMLDivElement | null // the .tab element (updated in place)
}
interface StoredTab {
id: string | null
title: string | null
}
export class TabApp {
private readonly tabs: TabEntry[] = []
private activeIndex = -1
private editingIndex = -1
private dragIndex = -1
private notifyAsked = false
private settings: Settings = DEFAULT_SETTINGS
private readonly paneHost: HTMLElement
private readonly tabBar: HTMLElement
private readonly approvalBar: HTMLDivElement
constructor(paneHost: HTMLElement, tabBar: HTMLElement) {
this.paneHost = paneHost
this.tabBar = tabBar
this.approvalBar = document.createElement('div')
this.approvalBar.id = 'approvalbar'
this.approvalBar.style.display = 'none'
document.body.appendChild(this.approvalBar)
this.restore()
}
/** Show/hide the approve/reject banner for the active tab's held request (H3). */
private updateApprovalBar(): void {
const session = this.tabs[this.activeIndex]?.session
if (!session || !session.pendingApproval) {
this.approvalBar.style.display = 'none'
return
}
this.approvalBar.replaceChildren()
const label = document.createElement('span')
label.className = 'approval-label'
label.textContent = `Claude wants to use ${session.pendingTool ?? 'a tool'}`
const approve = document.createElement('button')
approve.className = 'approval-yes'
approve.textContent = '✓ Approve'
approve.addEventListener('click', () => {
session.approve()
this.updateApprovalBar()
})
const reject = document.createElement('button')
reject.className = 'approval-no'
reject.textContent = '✗ Reject'
reject.addEventListener('click', () => {
session.reject()
this.updateApprovalBar()
})
this.approvalBar.append(label, approve, reject)
this.approvalBar.style.display = 'flex'
}
private displayTitle(entry: TabEntry, idx: number): string {
return entry.customTitle ?? entry.autoTitle ?? `Term ${idx + 1}`
}
/* ── persistence ─────────────────────────────────────────────── */
private persist(): void {
try {
const stored: StoredTab[] = this.tabs.map((t) => ({ id: t.session.id, title: t.customTitle }))
localStorage.setItem(TABS_KEY, JSON.stringify(stored))
localStorage.setItem(ACTIVE_KEY, String(this.activeIndex))
} catch {
// localStorage unavailable — run without persistence
}
}
private restore(): void {
let stored: StoredTab[] = []
try {
const raw = localStorage.getItem(TABS_KEY)
if (raw) {
const parsed: unknown = JSON.parse(raw)
if (Array.isArray(parsed)) {
stored = parsed.map((v): StoredTab => {
if (typeof v === 'string') return { id: v, title: null } // v0.2.0 format
if (v && typeof v === 'object' && 'id' in v) {
const o = v as { id: unknown; title?: unknown }
return {
id: typeof o.id === 'string' ? o.id : null,
title: typeof o.title === 'string' ? o.title : null,
}
}
return { id: null, title: null }
})
}
}
} catch {
// ignore malformed state
}
if (stored.length === 0) {
let legacy: string | null = null
try {
legacy = localStorage.getItem(LEGACY_KEY)
} catch {
legacy = null
}
// v0.2.x single-session migration only; otherwise stay empty and let
// syncLiveSessions() decide (host sessions, or a fresh tab as fallback).
if (legacy) stored = [{ id: legacy, title: null }]
}
for (const s of stored) this.addEntry(s.id, s.title)
let active = 0
try {
active = parseInt(localStorage.getItem(ACTIVE_KEY) ?? '0', 10)
} catch {
active = 0
}
if (!Number.isInteger(active) || active < 0 || active >= this.tabs.length) active = 0
this.rebuild()
if (this.tabs.length > 0) this.activate(active)
// v0.4: discover the host's running sessions and show them as tabs too.
void this.syncLiveSessions()
}
/**
* v0.4 multi-device: fetch the host's currently-running sessions and add a tab
* for each one not already open, so opening the app on any device shows (and
* joins/mirrors) everything running on the host. Falls back to one fresh tab
* when nothing is stored and nothing is live.
*/
private async syncLiveSessions(): Promise<void> {
let live: Array<{ id: string }> = []
try {
const res = await fetch('/live-sessions')
const data: unknown = await res.json()
if (Array.isArray(data)) live = data as Array<{ id: string }>
} catch {
live = []
}
const open = new Set(
this.tabs.map((t) => t.session.id).filter((x): x is string => typeof x === 'string'),
)
let added = false
for (const info of live) {
if (typeof info.id === 'string' && !open.has(info.id)) {
this.addEntry(info.id, null)
added = true
}
}
// Nothing restored and nothing live → start one fresh session.
if (this.tabs.length === 0) {
this.addEntry(null, null)
added = true
}
if (!added) return
this.rebuild()
const idx =
this.activeIndex >= 0 && this.activeIndex < this.tabs.length ? this.activeIndex : 0
this.activeIndex = idx
this.tabs.forEach((t, i) => (i === idx ? t.session.show() : t.session.hide()))
this.tabs.forEach((t) => this.refreshTab(t))
this.updateApprovalBar()
this.persist()
}
/** The active tab's server session id (null until it has attached). */
activeSessionId(): string | null {
return this.tabs[this.activeIndex]?.session.id ?? null
}
/** Focus the tab for `sessionId`, or open one that joins it (share-link target). */
openSession(sessionId: string): void {
const existing = this.tabs.findIndex((t) => t.session.id === sessionId)
if (existing >= 0) {
this.activate(existing)
return
}
this.addEntry(sessionId, null)
this.persist()
this.rebuild()
this.activate(this.tabs.length - 1)
}
/* ── tab lifecycle ───────────────────────────────────────────── */
private addEntry(
sessionId: string | null,
customTitle: string | null,
cwd?: string,
initialInput?: string,
): TabEntry {
const entry: TabEntry = {
session: null as unknown as TerminalSession,
customTitle,
autoTitle: null,
hasActivity: false,
el: null,
}
entry.session = new TerminalSession({
sessionId,
...(cwd !== undefined ? { cwd } : {}),
...(initialInput !== undefined ? { initialInput } : {}),
onSessionId: () => this.persist(),
// onActivity only fires for hidden (inactive) panes (see TerminalSession).
onActivity: () => {
entry.hasActivity = true
this.refreshTab(entry)
},
onTitle: (title) => {
entry.autoTitle = title.trim() || null
this.refreshTab(entry)
},
onStatus: () => this.refreshTab(entry),
onClaudeStatus: (status) => {
this.refreshTab(entry)
this.updateApprovalBar()
// Notify when a background tab needs approval (H2/H4).
if (status === 'waiting' && this.tabs.indexOf(entry) !== this.activeIndex) {
this.notify(entry)
}
},
})
this.paneHost.appendChild(entry.session.el)
this.tabs.push(entry)
entry.session.applyTheme(THEMES[this.settings.theme] ?? THEMES['dark']!, this.settings.fontSize)
entry.session.connect()
return entry
}
newTab(): void {
// M6: open the new tab in the active tab's current directory, if known.
const cwd = this.tabs[this.activeIndex]?.session.cwd ?? undefined
this.addEntry(null, null, cwd)
this.persist()
this.rebuild()
this.activate(this.tabs.length - 1)
}
/** O2: open a new tab in `cwd` and run `claude --resume <id>`. */
newTabForResume(cwd: string, sessionId: string): void {
this.addEntry(null, null, cwd || undefined, `claude --resume ${sessionId}`)
this.persist()
this.rebuild()
this.activate(this.tabs.length - 1)
}
activate(i: number): void {
if (i < 0 || i >= this.tabs.length) return
this.maybeAskNotify() // first switch is a user gesture — request notif permission
this.activeIndex = i
const entry = this.tabs[i]
if (entry) entry.hasActivity = false // viewing clears the unread dot
this.tabs.forEach((t, idx) => (idx === i ? t.session.show() : t.session.hide()))
this.tabs.forEach((t) => this.refreshTab(t)) // in-place class/text update, no rebuild
this.updateApprovalBar()
this.persist()
}
closeTab(i: number): void {
if (i < 0 || i >= this.tabs.length) return
const [entry] = this.tabs.splice(i, 1)
entry?.session.dispose()
if (this.editingIndex === i) this.editingIndex = -1
if (this.tabs.length === 0) {
this.addEntry(null, null)
this.persist()
this.rebuild()
this.activate(0)
return
}
const next = Math.min(i, this.tabs.length - 1)
this.persist()
this.rebuild()
this.activate(next)
}
private moveTab(from: number, to: number): void {
if (from < 0 || to < 0 || from === to || from >= this.tabs.length || to >= this.tabs.length) {
return
}
const activeEntry = this.tabs[this.activeIndex]
const [moved] = this.tabs.splice(from, 1)
if (!moved) return
this.tabs.splice(to, 0, moved)
if (activeEntry) this.activeIndex = this.tabs.indexOf(activeEntry)
this.persist()
this.rebuild()
}
private commitRename(i: number, value: string): void {
const entry = this.tabs[i]
if (entry) {
const trimmed = value.trim()
entry.customTitle = trimmed.length > 0 ? trimmed : null // empty → revert to auto
}
this.editingIndex = -1
this.persist()
this.rebuild()
}
/** Route key-bar input to the currently active tab. */
sendToActive(data: string): void {
this.tabs[this.activeIndex]?.session.send(data)
}
/** Re-assert the active tab's size (latest-writer-wins) when this device
* regains focus, so a shared session snaps back to this screen's size. */
refitActive(): void {
this.tabs[this.activeIndex]?.session.refit()
}
/** Apply theme + font settings to every terminal (M3). */
applySettings(s: Settings): void {
this.settings = s
const theme = THEMES[s.theme] ?? THEMES['dark']!
for (const t of this.tabs) t.session.applyTheme(theme, s.fontSize)
}
/** A read-only view of all tabs for the dashboard (M7). */
snapshot(): Array<{
idx: number
title: string
conn: string
claude: string
active: boolean
pending: boolean
}> {
return this.tabs.map((t, idx) => ({
idx,
title: this.displayTitle(t, idx),
conn: t.session.status,
claude: t.session.claudeStatus,
active: idx === this.activeIndex,
pending: t.session.pendingApproval,
}))
}
focusTab(idx: number): void {
this.activate(idx)
}
/** Scrollback search in the active tab (M1). */
findInActive(query: string, dir: 'next' | 'prev'): void {
const s = this.tabs[this.activeIndex]?.session
if (!s) return
if (dir === 'next') s.findNext(query)
else s.findPrevious(query)
}
clearActiveSearch(): void {
this.tabs[this.activeIndex]?.session.clearSearch()
}
/** Ask for notification permission once, on a user gesture (H2/H4). */
private maybeAskNotify(): void {
if (this.notifyAsked) return
this.notifyAsked = true
if (typeof Notification !== 'undefined' && Notification.permission === 'default') {
void Notification.requestPermission()
}
}
/** Browser notification for a background tab needing approval. */
private notify(entry: TabEntry): void {
if (typeof Notification === 'undefined' || Notification.permission !== 'granted') return
const title = this.displayTitle(entry, this.tabs.indexOf(entry))
new Notification(`Claude needs you — ${title}`, { body: 'Waiting for approval' })
}
/* ── rendering ───────────────────────────────────────────────── */
/** In-place update of one tab's classes/label/dot — never destroys the DOM. */
private refreshTab(entry: TabEntry): void {
const el = entry.el
if (!el) return
const idx = this.tabs.indexOf(entry)
el.classList.toggle('active', idx === this.activeIndex)
el.classList.toggle('unread', entry.hasActivity && idx !== this.activeIndex)
const cs = entry.session.claudeStatus
el.classList.toggle('claude-waiting', cs === 'waiting' && idx !== this.activeIndex)
const title = this.displayTitle(entry, idx)
el.title = title
const dot = el.querySelector('.tab-dot')
if (dot) dot.className = `tab-dot dot-${entry.session.status}`
const label = el.querySelector('.tab-label')
if (label) label.textContent = title
const claude = el.querySelector('.tab-claude')
if (claude) {
claude.textContent =
cs === 'working' ? '⚙' : cs === 'waiting' ? '⏳' : cs === 'idle' ? '✓' : ''
}
}
/** Full rebuild — ONLY for structural changes (add/close/reorder/rename). */
private rebuild(): void {
this.tabBar.replaceChildren()
this.tabs.forEach((entry, idx) => {
const tabEl = document.createElement('div')
entry.el = tabEl
tabEl.className = 'tab'
// Switch on pointerdown (fires before any drag; reliable with draggable, works on touch).
tabEl.addEventListener('pointerdown', () => this.activate(idx))
// Middle-click closes.
tabEl.addEventListener('auxclick', (e) => {
if (e.button === 1) {
e.preventDefault()
this.closeTab(idx)
}
})
// Drag-to-reorder (disabled while renaming).
if (idx !== this.editingIndex) {
tabEl.draggable = true
tabEl.addEventListener('dragstart', (e) => {
this.dragIndex = idx
e.dataTransfer?.setData('text/plain', String(idx))
tabEl.classList.add('dragging')
})
tabEl.addEventListener('dragover', (e) => {
e.preventDefault()
tabEl.classList.add('drag-over')
})
tabEl.addEventListener('dragleave', () => tabEl.classList.remove('drag-over'))
tabEl.addEventListener('drop', (e) => {
e.preventDefault()
tabEl.classList.remove('drag-over')
this.moveTab(this.dragIndex, idx)
})
tabEl.addEventListener('dragend', () => {
this.dragIndex = -1
tabEl.classList.remove('dragging')
})
}
const dot = document.createElement('span')
dot.className = `tab-dot dot-${entry.session.status}`
tabEl.appendChild(dot)
if (idx === this.editingIndex) {
const input = document.createElement('input')
input.className = 'tab-rename'
input.value = this.displayTitle(entry, idx)
input.addEventListener('keydown', (e) => {
if (e.key === 'Enter') this.commitRename(idx, input.value)
else if (e.key === 'Escape') {
this.editingIndex = -1
this.rebuild()
}
e.stopPropagation()
})
input.addEventListener('blur', () => this.commitRename(idx, input.value))
input.addEventListener('pointerdown', (e) => e.stopPropagation()) // don't re-activate
tabEl.appendChild(input)
requestAnimationFrame(() => {
input.focus()
input.select()
})
} else {
const label = document.createElement('span')
label.className = 'tab-label'
label.textContent = this.displayTitle(entry, idx)
label.addEventListener('dblclick', () => {
this.editingIndex = idx
this.rebuild()
})
tabEl.appendChild(label)
const claude = document.createElement('span')
claude.className = 'tab-claude'
tabEl.appendChild(claude)
const close = document.createElement('button')
close.className = 'tab-close'
close.textContent = '×'
close.title = 'Close tab (the shell keeps running on the server)'
close.setAttribute('aria-label', 'Close tab')
close.addEventListener('pointerdown', (e) => e.stopPropagation())
close.addEventListener('click', (e) => {
e.stopPropagation()
this.closeTab(idx)
})
tabEl.appendChild(close)
}
// Apply current active/unread state.
this.refreshTab(entry)
this.tabBar.appendChild(tabEl)
})
const add = document.createElement('button')
add.className = 'tab-add'
add.textContent = '+'
add.title = 'New session'
add.setAttribute('aria-label', 'New session')
add.addEventListener('click', () => this.newTab())
this.tabBar.appendChild(add)
}
}