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* Minimal TUI implementation with differential rendering\n */\n\nimport * as fs from \"node:fs\";\nimport * as os from \"node:os\";\nimport * as path from \"node:path\";\nimport { performance } from \"node:perf_hooks\";\nimport { isKeyRelease, matchesKey } from \"./keys.js\";\nimport type { Terminal } from \"./terminal.js\";\nimport { deleteKittyImage, getCapabilities, isImageLine, setCellDimensions } from \"./terminal-image.js\";\nimport { extractSegments, normalizeTerminalOutput, sliceByColumn, sliceWithWidth, visibleWidth } from \"./utils.js\";\n\nconst KITTY_SEQUENCE_PREFIX = \"\\x1b_G\";\n\nfunction extractKittyImageIds(line: string): number[] {\n\tconst sequenceStart = line.indexOf(KITTY_SEQUENCE_PREFIX);\n\tif (sequenceStart === -1) return [];\n\n\tconst paramsStart = sequenceStart + KITTY_SEQUENCE_PREFIX.length;\n\tconst paramsEnd = line.indexOf(\";\", paramsStart);\n\tif (paramsEnd === -1) return [];\n\n\tconst params = line.slice(paramsStart, paramsEnd);\n\tfor (const param of params.split(\",\")) {\n\t\tconst [key, value] = param.split(\"=\", 2);\n\t\tif (key !== \"i\" || value === undefined) continue;\n\t\tconst id = Number(value);\n\t\tif (Number.isInteger(id) && id > 0 && id <= 0xffffffff) {\n\t\t\treturn [id];\n\t\t}\n\t}\n\treturn [];\n}\n\n/**\n * Component interface - all components must implement this\n */\nexport interface Component {\n\t/**\n\t * Render the component to lines for the given viewport width\n\t * @param width - Current viewport width\n\t * @returns Array of strings, each representing a line\n\t */\n\trender(width: number): string[];\n\n\t/**\n\t * Optional handler for keyboard input when component has focus\n\t */\n\thandleInput?(data: string): void;\n\n\t/**\n\t * If true, component receives key release events (Kitty protocol).\n\t * Default is false - release events are filtered out.\n\t */\n\twantsKeyRelease?: boolean;\n\n\t/**\n\t * Invalidate any cached rendering state.\n\t * Called when theme changes or when component needs to re-render from scratch.\n\t */\n\tinvalidate(): void;\n}\n\ntype InputListenerResult = { consume?: boolean; data?: string } | undefined;\ntype InputListener = (data: string) => InputListenerResult;\n\n/**\n * Interface for components that can receive focus and display a hardware cursor.\n * When focused, the component should emit CURSOR_MARKER at the cursor position\n * in its render output. TUI will find this marker and position the hardware\n * cursor there for proper IME candidate window positioning.\n */\nexport interface Focusable {\n\t/** Set by TUI when focus changes. Component should emit CURSOR_MARKER when true. */\n\tfocused: boolean;\n}\n\n/** Type guard to check if a component implements Focusable */\nexport function isFocusable(component: Component | null): component is Component & Focusable {\n\treturn component !== null && \"focused\" in component;\n}\n\n/**\n * Cursor position marker - APC (Application Program Command) sequence.\n * This is a zero-width escape sequence that terminals ignore.\n * Components emit this at the cursor position when focused.\n * TUI finds and strips this marker, then positions the hardware cursor there.\n */\nexport const CURSOR_MARKER = \"\\x1b_pi:c\\x07\";\n\nexport { visibleWidth };\n\n/**\n * Anchor position for overlays\n */\nexport type OverlayAnchor =\n\t| \"center\"\n\t| \"top-left\"\n\t| \"top-right\"\n\t| \"bottom-left\"\n\t| \"bottom-right\"\n\t| \"top-center\"\n\t| \"bottom-center\"\n\t| \"left-center\"\n\t| \"right-center\";\n\n/**\n * Margin configuration for overlays\n */\nexport interface OverlayMargin {\n\ttop?: number;\n\tright?: number;\n\tbottom?: number;\n\tleft?: number;\n}\n\n/** Value that can be absolute (number) or percentage (string like \"50%\") */\nexport type SizeValue = number | `${number}%`;\n\n/** Parse a SizeValue into absolute value given a reference size */\nfunction parseSizeValue(value: SizeValue | undefined, referenceSize: number): number | undefined {\n\tif (value === undefined) return undefined;\n\tif (typeof value === \"number\") return value;\n\t// Parse percentage string like \"50%\"\n\tconst match = value.match(/^(\\d+(?:\\.\\d+)?)%$/);\n\tif (match) {\n\t\treturn Math.floor((referenceSize * parseFloat(match[1])) / 100);\n\t}\n\treturn undefined;\n}\n\nfunction isTermuxSession(): boolean {\n\treturn Boolean(process.env.TERMUX_VERSION);\n}\n\n/**\n * Options for overlay positioning and sizing.\n * Values can be absolute numbers or percentage strings (e.g., \"50%\").\n */\nexport interface OverlayOptions {\n\t// === Sizing ===\n\t/** Width in columns, or percentage of terminal width (e.g., \"50%\") */\n\twidth?: SizeValue;\n\t/** Minimum width in columns */\n\tminWidth?: number;\n\t/** Maximum height in rows, or percentage of terminal height (e.g., \"50%\") */\n\tmaxHeight?: SizeValue;\n\n\t// === Positioning - anchor-based ===\n\t/** Anchor point for positioning (default: 'center') */\n\tanchor?: OverlayAnchor;\n\t/** Horizontal offset from anchor position (positive = right) */\n\toffsetX?: number;\n\t/** Vertical offset from anchor position (positive = down) */\n\toffsetY?: number;\n\n\t// === Positioning - percentage or absolute ===\n\t/** Row position: absolute number, or percentage (e.g., \"25%\" = 25% from top) */\n\trow?: SizeValue;\n\t/** Column position: absolute number, or percentage (e.g., \"50%\" = centered horizontally) */\n\tcol?: SizeValue;\n\n\t// === Margin from terminal edges ===\n\t/** Margin from terminal edges. Number applies to all sides. */\n\tmargin?: OverlayMargin | number;\n\n\t// === Visibility ===\n\t/**\n\t * Control overlay visibility based on terminal dimensions.\n\t * If provided, overlay is only rendered when this returns true.\n\t * Called each render cycle with current terminal dimensions.\n\t */\n\tvisible?: (termWidth: number, termHeight: number) => boolean;\n\t/** If true, don't capture keyboard focus when shown */\n\tnonCapturing?: boolean;\n}\n\n/**\n * Handle returned by showOverlay for controlling the overlay\n */\nexport interface OverlayHandle {\n\t/** Permanently remove the overlay (cannot be shown again) */\n\thide(): void;\n\t/** Temporarily hide or show the overlay */\n\tsetHidden(hidden: boolean): void;\n\t/** Check if overlay is temporarily hidden */\n\tisHidden(): boolean;\n\t/** Focus this overlay and bring it to the visual front */\n\tfocus(): void;\n\t/** Release focus to the previous target */\n\tunfocus(): void;\n\t/** Check if this overlay currently has focus */\n\tisFocused(): boolean;\n}\n\n/**\n * Container - a component that contains other components\n */\nexport class Container implements Component {\n\tchildren: Component[] = [];\n\n\taddChild(component: Component): void {\n\t\tthis.children.push(component);\n\t}\n\n\tremoveChild(component: Component): void {\n\t\tconst index = this.children.indexOf(component);\n\t\tif (index !== -1) {\n\t\t\tthis.children.splice(index, 1);\n\t\t}\n\t}\n\n\tclear(): void {\n\t\tthis.children = [];\n\t}\n\n\tinvalidate(): void {\n\t\tfor (const child of this.children) {\n\t\t\tchild.invalidate?.();\n\t\t}\n\t}\n\n\trender(width: number): string[] {\n\t\tconst lines: string[] = [];\n\t\tfor (const child of this.children) {\n\t\t\tconst childLines = child.render(width);\n\t\t\tfor (const line of childLines) {\n\t\t\t\tlines.push(line);\n\t\t\t}\n\t\t}\n\t\treturn lines;\n\t}\n}\n\n/**\n * TUI - Main class for managing terminal UI with differential rendering\n */\nexport class TUI extends Container {\n\tpublic terminal: Terminal;\n\tprivate previousLines: string[] = [];\n\tprivate previousKittyImageIds = new Set<number>();\n\tprivate previousWidth = 0;\n\tprivate previousHeight = 0;\n\tprivate focusedComponent: Component | null = null;\n\tprivate inputListeners = new Set<InputListener>();\n\n\t/** Global callback for debug key (Shift+Ctrl+D). 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0;\n\tprivate overlayStack: {\n\t\tcomponent: Component;\n\t\toptions?: OverlayOptions;\n\t\tpreFocus: Component | null;\n\t\thidden: boolean;\n\t\tfocusOrder: number;\n\t}[] = [];\n\n\tconstructor(terminal: Terminal, showHardwareCursor?: boolean) {\n\t\tsuper();\n\t\tthis.terminal = terminal;\n\t\tif (showHardwareCursor !== undefined) {\n\t\t\tthis.showHardwareCursor = showHardwareCursor;\n\t\t}\n\t}\n\n\tget fullRedraws(): number {\n\t\treturn this.fullRedrawCount;\n\t}\n\n\tgetShowHardwareCursor(): boolean {\n\t\treturn this.showHardwareCursor;\n\t}\n\n\tsetShowHardwareCursor(enabled: boolean): void {\n\t\tif (this.showHardwareCursor === enabled) return;\n\t\tthis.showHardwareCursor = enabled;\n\t\tif (!enabled) {\n\t\t\tthis.terminal.hideCursor();\n\t\t}\n\t\tthis.requestRender();\n\t}\n\n\tgetClearOnShrink(): boolean {\n\t\treturn this.clearOnShrink;\n\t}\n\n\t/**\n\t * Set whether to trigger full re-render when content shrinks.\n\t * When true (default), empty rows are cleared 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focus if overlay is actually visible\n\t\tif (!options?.nonCapturing && this.isOverlayVisible(entry)) {\n\t\t\tthis.setFocus(component);\n\t\t}\n\t\tthis.terminal.hideCursor();\n\t\tthis.requestRender();\n\n\t\t// Return handle for controlling this overlay\n\t\treturn {\n\t\t\thide: () => {\n\t\t\t\tconst index = this.overlayStack.indexOf(entry);\n\t\t\t\tif (index !== -1) {\n\t\t\t\t\tthis.overlayStack.splice(index, 1);\n\t\t\t\t\t// Restore focus if this overlay had focus\n\t\t\t\t\tif (this.focusedComponent === component) {\n\t\t\t\t\t\tconst topVisible = this.getTopmostVisibleOverlay();\n\t\t\t\t\t\tthis.setFocus(topVisible?.component ?? entry.preFocus);\n\t\t\t\t\t}\n\t\t\t\t\tif (this.overlayStack.length === 0) this.terminal.hideCursor();\n\t\t\t\t\tthis.requestRender();\n\t\t\t\t}\n\t\t\t},\n\t\t\tsetHidden: (hidden: boolean) => {\n\t\t\t\tif (entry.hidden === hidden) return;\n\t\t\t\tentry.hidden = hidden;\n\t\t\t\t// Update focus when hiding/showing\n\t\t\t\tif (hidden) 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(this.focusedComponent !== component) return;\n\t\t\t\tconst topVisible = this.getTopmostVisibleOverlay();\n\t\t\t\tthis.setFocus(topVisible && topVisible !== entry ? topVisible.component : entry.preFocus);\n\t\t\t\tthis.requestRender();\n\t\t\t},\n\t\t\tisFocused: () => this.focusedComponent === component,\n\t\t};\n\t}\n\n\t/** Hide the topmost overlay and restore previous focus. */\n\thideOverlay(): void {\n\t\tconst overlay = this.overlayStack.pop();\n\t\tif (!overlay) return;\n\t\tif (this.focusedComponent === overlay.component) {\n\t\t\t// Find topmost visible overlay, or fall back to preFocus\n\t\t\tconst topVisible = this.getTopmostVisibleOverlay();\n\t\t\tthis.setFocus(topVisible?.component ?? overlay.preFocus);\n\t\t}\n\t\tif (this.overlayStack.length === 0) this.terminal.hideCursor();\n\t\tthis.requestRender();\n\t}\n\n\t/** Check if there are any visible overlays */\n\thasOverlay(): boolean {\n\t\treturn this.overlayStack.some((o) => this.isOverlayVisible(o));\n\t}\n\n\t/** Check if an overlay entry is currently visible */\n\tprivate isOverlayVisible(entry: (typeof this.overlayStack)[number]): boolean {\n\t\tif (entry.hidden) return false;\n\t\tif (entry.options?.visible) {\n\t\t\treturn entry.options.visible(this.terminal.columns, this.terminal.rows);\n\t\t}\n\t\treturn true;\n\t}\n\n\t/** Find the topmost visible capturing overlay, if any */\n\tprivate getTopmostVisibleOverlay(): (typeof this.overlayStack)[number] | undefined {\n\t\tfor (let i = this.overlayStack.length - 1; i >= 0; i--) {\n\t\t\tif (this.overlayStack[i].options?.nonCapturing) continue;\n\t\t\tif (this.isOverlayVisible(this.overlayStack[i])) {\n\t\t\t\treturn this.overlayStack[i];\n\t\t\t}\n\t\t}\n\t\treturn undefined;\n\t}\n\n\toverride invalidate(): void {\n\t\tsuper.invalidate();\n\t\tfor (const overlay of this.overlayStack) overlay.component.invalidate?.();\n\t}\n\n\tstart(): void {\n\t\tthis.stopped = false;\n\t\tthis.terminal.start(\n\t\t\t(data) => this.handleInput(data),\n\t\t\t() => this.requestRender(),\n\t\t);\n\t\tthis.terminal.hideCursor();\n\t\tthis.queryCellSize();\n\t\tthis.requestRender();\n\t}\n\n\taddInputListener(listener: InputListener): () => void {\n\t\tthis.inputListeners.add(listener);\n\t\treturn () => {\n\t\t\tthis.inputListeners.delete(listener);\n\t\t};\n\t}\n\n\tremoveInputListener(listener: InputListener): void {\n\t\tthis.inputListeners.delete(listener);\n\t}\n\n\tprivate queryCellSize(): void {\n\t\t// Only query if terminal supports images (cell size is only used for image rendering)\n\t\tif (!getCapabilities().images) {\n\t\t\treturn;\n\t\t}\n\t\t// Query terminal for cell size in pixels: CSI 16 t\n\t\t// Response format: CSI 6 ; height ; width t\n\t\tthis.terminal.write(\"\\x1b[16t\");\n\t}\n\n\tstop(): void {\n\t\tthis.stopped = true;\n\t\tif (this.renderTimer) {\n\t\t\tclearTimeout(this.renderTimer);\n\t\t\tthis.renderTimer = undefined;\n\t\t}\n\t\t// Move cursor to the end of the content to prevent overwriting/artifacts on exit\n\t\tif (this.previousLines.length > 0) {\n\t\t\tconst targetRow = this.previousLines.length; // Line after the last content\n\t\t\tconst lineDiff = targetRow - this.hardwareCursorRow;\n\t\t\tif (lineDiff > 0) {\n\t\t\t\tthis.terminal.write(`\\x1b[${lineDiff}B`);\n\t\t\t} else if (lineDiff < 0) {\n\t\t\t\tthis.terminal.write(`\\x1b[${-lineDiff}A`);\n\t\t\t}\n\t\t\tthis.terminal.write(\"\\r\\n\");\n\t\t}\n\n\t\tthis.terminal.showCursor();\n\t\tthis.terminal.stop();\n\t}\n\n\trequestRender(force = false): void {\n\t\tif (force) {\n\t\t\tthis.previousLines = [];\n\t\t\tthis.previousWidth = -1; // -1 triggers widthChanged, forcing a full clear\n\t\t\tthis.previousHeight = -1; // -1 triggers heightChanged, forcing a full clear\n\t\t\tthis.cursorRow = 0;\n\t\t\tthis.hardwareCursorRow = 0;\n\t\t\tthis.maxLinesRendered = 0;\n\t\t\tthis.previousViewportTop = 0;\n\t\t\tif (this.renderTimer) {\n\t\t\t\tclearTimeout(this.renderTimer);\n\t\t\t\tthis.renderTimer = undefined;\n\t\t\t}\n\t\t\tthis.renderRequested = true;\n\t\t\tprocess.nextTick(() => {\n\t\t\t\tif (this.stopped || !this.renderRequested) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\tthis.renderRequested = false;\n\t\t\t\tthis.lastRenderAt = performance.now();\n\t\t\t\tthis.doRender();\n\t\t\t});\n\t\t\treturn;\n\t\t}\n\t\tif (this.renderRequested) return;\n\t\tthis.renderRequested = true;\n\t\tprocess.nextTick(() => this.scheduleRender());\n\t}\n\n\tprivate scheduleRender(): void {\n\t\tif (this.stopped || this.renderTimer || !this.renderRequested) {\n\t\t\treturn;\n\t\t}\n\t\tconst elapsed = performance.now() - this.lastRenderAt;\n\t\tconst delay = Math.max(0, TUI.MIN_RENDER_INTERVAL_MS - elapsed);\n\t\tthis.renderTimer = setTimeout(() => {\n\t\t\tthis.renderTimer = undefined;\n\t\t\tif (this.stopped || !this.renderRequested) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tthis.renderRequested = false;\n\t\t\tthis.lastRenderAt = performance.now();\n\t\t\tthis.doRender();\n\t\t\tif (this.renderRequested) {\n\t\t\t\tthis.scheduleRender();\n\t\t\t}\n\t\t}, delay);\n\t}\n\n\tprivate handleInput(data: string): void {\n\t\tif (this.inputListeners.size > 0) {\n\t\t\tlet current = data;\n\t\t\tfor (const listener of this.inputListeners) {\n\t\t\t\tconst result = listener(current);\n\t\t\t\tif (result?.consume) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\tif (result?.data !== undefined) {\n\t\t\t\t\tcurrent = result.data;\n\t\t\t\t}\n\t\t\t}\n\t\t\tif (current.length === 0) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tdata = current;\n\t\t}\n\n\t\t// Consume terminal cell size responses without blocking unrelated input.\n\t\tif (this.consumeCellSizeResponse(data)) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Global debug key handler (Shift+Ctrl+D)\n\t\tif (matchesKey(data, \"shift+ctrl+d\") && this.onDebug) {\n\t\t\tthis.onDebug();\n\t\t\treturn;\n\t\t}\n\n\t\t// If focused component is an overlay, verify it's still visible\n\t\t// (visibility can change due to terminal resize or visible() callback)\n\t\tconst focusedOverlay = this.overlayStack.find((o) => o.component === this.focusedComponent);\n\t\tif (focusedOverlay && !this.isOverlayVisible(focusedOverlay)) {\n\t\t\t// Focused overlay is no longer visible, redirect to topmost visible overlay\n\t\t\tconst topVisible = this.getTopmostVisibleOverlay();\n\t\t\tif (topVisible) {\n\t\t\t\tthis.setFocus(topVisible.component);\n\t\t\t} else {\n\t\t\t\t// No visible overlays, restore to preFocus\n\t\t\t\tthis.setFocus(focusedOverlay.preFocus);\n\t\t\t}\n\t\t}\n\n\t\t// Pass input to focused component (including Ctrl+C)\n\t\t// The focused component can decide how to handle Ctrl+C\n\t\tif (this.focusedComponent?.handleInput) {\n\t\t\t// Filter out key release events unless component opts in\n\t\t\tif (isKeyRelease(data) && !this.focusedComponent.wantsKeyRelease) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tthis.focusedComponent.handleInput(data);\n\t\t\tthis.requestRender();\n\t\t}\n\t}\n\n\tprivate consumeCellSizeResponse(data: string): boolean {\n\t\t// Response format: ESC [ 6 ; height ; width t\n\t\tconst match = data.match(/^\\x1b\\[6;(\\d+);(\\d+)t$/);\n\t\tif (!match) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst heightPx = parseInt(match[1], 10);\n\t\tconst widthPx = parseInt(match[2], 10);\n\t\tif (heightPx <= 0 || widthPx <= 0) {\n\t\t\treturn true;\n\t\t}\n\n\t\tsetCellDimensions({ widthPx, heightPx });\n\t\t// Invalidate all components so images re-render with correct dimensions.\n\t\tthis.invalidate();\n\t\tthis.requestRender();\n\t\treturn true;\n\t}\n\n\t/**\n\t * Resolve overlay layout from options.\n\t * Returns { width, row, col, maxHeight } for rendering.\n\t */\n\tprivate resolveOverlayLayout(\n\t\toptions: OverlayOptions | undefined,\n\t\toverlayHeight: number,\n\t\ttermWidth: number,\n\t\ttermHeight: number,\n\t): { width: number; row: number; col: number; maxHeight: number | undefined } {\n\t\tconst opt = options ?? {};\n\n\t\t// Parse margin (clamp to non-negative)\n\t\tconst margin =\n\t\t\ttypeof opt.margin === \"number\"\n\t\t\t\t? { top: opt.margin, right: opt.margin, bottom: opt.margin, left: opt.margin }\n\t\t\t\t: (opt.margin ?? {});\n\t\tconst marginTop = Math.max(0, margin.top ?? 0);\n\t\tconst marginRight = Math.max(0, margin.right ?? 0);\n\t\tconst marginBottom = Math.max(0, margin.bottom ?? 0);\n\t\tconst marginLeft = Math.max(0, margin.left ?? 0);\n\n\t\t// Available space after margins\n\t\tconst availWidth = Math.max(1, termWidth - marginLeft - marginRight);\n\t\tconst availHeight = Math.max(1, termHeight - marginTop - marginBottom);\n\n\t\t// === Resolve width ===\n\t\tlet width = parseSizeValue(opt.width, termWidth) ?? Math.min(80, availWidth);\n\t\t// Apply minWidth\n\t\tif (opt.minWidth !== undefined) {\n\t\t\twidth = Math.max(width, opt.minWidth);\n\t\t}\n\t\t// Clamp to available space\n\t\twidth = Math.max(1, Math.min(width, availWidth));\n\n\t\t// === Resolve maxHeight ===\n\t\tlet maxHeight = parseSizeValue(opt.maxHeight, termHeight);\n\t\t// Clamp to available space\n\t\tif (maxHeight !== undefined) {\n\t\t\tmaxHeight = Math.max(1, Math.min(maxHeight, availHeight));\n\t\t}\n\n\t\t// Effective overlay height (may be clamped by maxHeight)\n\t\tconst effectiveHeight = maxHeight !== undefined ? Math.min(overlayHeight, maxHeight) : overlayHeight;\n\n\t\t// === Resolve position ===\n\t\tlet row: number;\n\t\tlet col: number;\n\n\t\tif (opt.row !== undefined) {\n\t\t\tif (typeof opt.row === \"string\") {\n\t\t\t\t// Percentage: 0% = top, 100% = bottom (overlay stays within bounds)\n\t\t\t\tconst match = opt.row.match(/^(\\d+(?:\\.\\d+)?)%$/);\n\t\t\t\tif (match) {\n\t\t\t\t\tconst maxRow = Math.max(0, availHeight - effectiveHeight);\n\t\t\t\t\tconst percent = parseFloat(match[1]) / 100;\n\t\t\t\t\trow = marginTop + Math.floor(maxRow * percent);\n\t\t\t\t} else {\n\t\t\t\t\t// Invalid format, fall back to center\n\t\t\t\t\trow = this.resolveAnchorRow(\"center\", effectiveHeight, availHeight, marginTop);\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Absolute row position\n\t\t\t\trow = opt.row;\n\t\t\t}\n\t\t} else {\n\t\t\t// Anchor-based (default: center)\n\t\t\tconst anchor = opt.anchor ?? \"center\";\n\t\t\trow = this.resolveAnchorRow(anchor, effectiveHeight, availHeight, marginTop);\n\t\t}\n\n\t\tif (opt.col !== undefined) {\n\t\t\tif (typeof opt.col === \"string\") {\n\t\t\t\t// Percentage: 0% = left, 100% = right (overlay stays within bounds)\n\t\t\t\tconst match = opt.col.match(/^(\\d+(?:\\.\\d+)?)%$/);\n\t\t\t\tif (match) {\n\t\t\t\t\tconst maxCol = Math.max(0, availWidth - width);\n\t\t\t\t\tconst percent = parseFloat(match[1]) / 100;\n\t\t\t\t\tcol = marginLeft + Math.floor(maxCol * percent);\n\t\t\t\t} else {\n\t\t\t\t\t// Invalid format, fall back to center\n\t\t\t\t\tcol = this.resolveAnchorCol(\"center\", width, availWidth, marginLeft);\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Absolute column position\n\t\t\t\tcol = opt.col;\n\t\t\t}\n\t\t} else {\n\t\t\t// Anchor-based (default: center)\n\t\t\tconst anchor = opt.anchor ?? \"center\";\n\t\t\tcol = this.resolveAnchorCol(anchor, width, availWidth, marginLeft);\n\t\t}\n\n\t\t// Apply offsets\n\t\tif (opt.offsetY !== undefined) row += opt.offsetY;\n\t\tif (opt.offsetX !== undefined) col += opt.offsetX;\n\n\t\t// Clamp to terminal bounds (respecting margins)\n\t\trow = Math.max(marginTop, Math.min(row, termHeight - marginBottom - effectiveHeight));\n\t\tcol = Math.max(marginLeft, Math.min(col, termWidth - marginRight - width));\n\n\t\treturn { width, row, col, maxHeight };\n\t}\n\n\tprivate resolveAnchorRow(anchor: OverlayAnchor, height: number, availHeight: number, marginTop: number): number {\n\t\tswitch (anchor) {\n\t\t\tcase \"top-left\":\n\t\t\tcase \"top-center\":\n\t\t\tcase \"top-right\":\n\t\t\t\treturn marginTop;\n\t\t\tcase \"bottom-left\":\n\t\t\tcase \"bottom-center\":\n\t\t\tcase \"bottom-right\":\n\t\t\t\treturn marginTop + availHeight - height;\n\t\t\tcase \"left-center\":\n\t\t\tcase \"center\":\n\t\t\tcase \"right-center\":\n\t\t\t\treturn marginTop + Math.floor((availHeight - height) / 2);\n\t\t}\n\t}\n\n\tprivate resolveAnchorCol(anchor: OverlayAnchor, width: number, availWidth: number, marginLeft: number): number {\n\t\tswitch (anchor) {\n\t\t\tcase \"top-left\":\n\t\t\tcase \"left-center\":\n\t\t\tcase \"bottom-left\":\n\t\t\t\treturn marginLeft;\n\t\t\tcase \"top-right\":\n\t\t\tcase \"right-center\":\n\t\t\tcase \"bottom-right\":\n\t\t\t\treturn marginLeft + availWidth - width;\n\t\t\tcase \"top-center\":\n\t\t\tcase \"center\":\n\t\t\tcase \"bottom-center\":\n\t\t\t\treturn marginLeft + Math.floor((availWidth - width) / 2);\n\t\t}\n\t}\n\n\t/** Composite all overlays into content lines (sorted by focusOrder, higher = on top). */\n\tprivate compositeOverlays(lines: string[], termWidth: number, termHeight: number): string[] {\n\t\tif (this.overlayStack.length === 0) return lines;\n\t\tconst result = [...lines];\n\n\t\t// Pre-render all visible overlays and calculate positions\n\t\tconst rendered: { overlayLines: string[]; row: number; col: number; w: number }[] = [];\n\t\tlet minLinesNeeded = result.length;\n\n\t\tconst visibleEntries = this.overlayStack.filter((e) => this.isOverlayVisible(e));\n\t\tvisibleEntries.sort((a, b) => a.focusOrder - b.focusOrder);\n\t\tfor (const entry of visibleEntries) {\n\t\t\tconst { component, options } = entry;\n\n\t\t\t// Get layout with height=0 first to determine width and maxHeight\n\t\t\t// (width and maxHeight don't depend on overlay height)\n\t\t\tconst { width, maxHeight } = this.resolveOverlayLayout(options, 0, termWidth, termHeight);\n\n\t\t\t// Render component at calculated width\n\t\t\tlet overlayLines = component.render(width);\n\n\t\t\t// Apply maxHeight if specified\n\t\t\tif (maxHeight !== undefined && overlayLines.length > maxHeight) {\n\t\t\t\toverlayLines = overlayLines.slice(0, maxHeight);\n\t\t\t}\n\n\t\t\t// Get final row/col with actual overlay height\n\t\t\tconst { row, col } = this.resolveOverlayLayout(options, overlayLines.length, termWidth, termHeight);\n\n\t\t\trendered.push({ overlayLines, row, col, w: width });\n\t\t\tminLinesNeeded = Math.max(minLinesNeeded, row + overlayLines.length);\n\t\t}\n\n\t\t// Pad to at least terminal height so overlays have screen-relative positions.\n\t\t// Excludes maxLinesRendered: the historical high-water mark caused self-reinforcing\n\t\t// inflation that pushed content into scrollback on terminal widen.\n\t\tconst workingHeight = Math.max(result.length, termHeight, minLinesNeeded);\n\n\t\t// Extend result with empty lines if content is too short for overlay placement or working area\n\t\twhile (result.length < workingHeight) {\n\t\t\tresult.push(\"\");\n\t\t}\n\n\t\tconst viewportStart = Math.max(0, workingHeight - termHeight);\n\n\t\t// Composite each overlay\n\t\tfor (const { overlayLines, row, col, w } of rendered) {\n\t\t\tfor (let i = 0; i < overlayLines.length; i++) {\n\t\t\t\tconst idx = viewportStart + row + i;\n\t\t\t\tif (idx >= 0 && idx < result.length) {\n\t\t\t\t\t// Defensive: truncate overlay line to declared width before compositing\n\t\t\t\t\t// (components should already respect width, but this ensures it)\n\t\t\t\t\tconst truncatedOverlayLine =\n\t\t\t\t\t\tvisibleWidth(overlayLines[i]) > w ? sliceByColumn(overlayLines[i], 0, w, true) : overlayLines[i];\n\t\t\t\t\tresult[idx] = this.compositeLineAt(result[idx], truncatedOverlayLine, col, w, termWidth);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\tprivate static readonly SEGMENT_RESET = \"\\x1b[0m\\x1b]8;;\\x07\";\n\n\tprivate applyLineResets(lines: string[]): string[] {\n\t\tconst reset = TUI.SEGMENT_RESET;\n\t\tfor (let i = 0; i < lines.length; i++) {\n\t\t\tconst line = lines[i];\n\t\t\tif (!isImageLine(line)) {\n\t\t\t\tlines[i] = normalizeTerminalOutput(line) + reset;\n\t\t\t}\n\t\t}\n\t\treturn lines;\n\t}\n\n\tprivate collectKittyImageIds(lines: string[]): Set<number> {\n\t\tconst ids = new Set<number>();\n\t\tfor (const line of lines) {\n\t\t\tfor (const id of extractKittyImageIds(line)) {\n\t\t\t\tids.add(id);\n\t\t\t}\n\t\t}\n\t\treturn ids;\n\t}\n\n\tprivate deleteKittyImages(ids: Iterable<number>): string {\n\t\tlet buffer = \"\";\n\t\tfor (const id of ids) {\n\t\t\tbuffer += deleteKittyImage(id);\n\t\t}\n\t\treturn buffer;\n\t}\n\n\tprivate expandLastChangedForKittyImages(firstChanged: number, lastChanged: number): number {\n\t\tlet expandedLastChanged = lastChanged;\n\t\tfor (let i = firstChanged; i < this.previousLines.length; i++) {\n\t\t\tif (extractKittyImageIds(this.previousLines[i]).length > 0) {\n\t\t\t\texpandedLastChanged = Math.max(expandedLastChanged, i);\n\t\t\t}\n\t\t}\n\t\treturn expandedLastChanged;\n\t}\n\n\tprivate deleteChangedKittyImages(firstChanged: number, lastChanged: number): string {\n\t\tif (firstChanged < 0 || lastChanged < firstChanged) return \"\";\n\n\t\tconst ids = new Set<number>();\n\t\tconst maxLine = Math.min(lastChanged, this.previousLines.length - 1);\n\t\tfor (let i = firstChanged; i <= maxLine; i++) {\n\t\t\tfor (const id of extractKittyImageIds(this.previousLines[i] ?? \"\")) {\n\t\t\t\tids.add(id);\n\t\t\t}\n\t\t}\n\n\t\treturn this.deleteKittyImages(ids);\n\t}\n\n\t/** Splice overlay content into a base line at a specific column. Single-pass optimized. */\n\tprivate compositeLineAt(\n\t\tbaseLine: string,\n\t\toverlayLine: string,\n\t\tstartCol: number,\n\t\toverlayWidth: number,\n\t\ttotalWidth: number,\n\t): string {\n\t\tif (isImageLine(baseLine)) return baseLine;\n\n\t\t// Single pass through baseLine extracts both before and after segments\n\t\tconst afterStart = startCol + overlayWidth;\n\t\tconst base = extractSegments(baseLine, startCol, afterStart, totalWidth - afterStart, true);\n\n\t\t// Extract overlay with width tracking (strict=true to exclude wide chars at boundary)\n\t\tconst overlay = sliceWithWidth(overlayLine, 0, overlayWidth, true);\n\n\t\t// Pad segments to target widths\n\t\tconst beforePad = Math.max(0, startCol - base.beforeWidth);\n\t\tconst overlayPad = Math.max(0, overlayWidth - overlay.width);\n\t\tconst actualBeforeWidth = Math.max(startCol, base.beforeWidth);\n\t\tconst actualOverlayWidth = Math.max(overlayWidth, overlay.width);\n\t\tconst afterTarget = Math.max(0, totalWidth - actualBeforeWidth - actualOverlayWidth);\n\t\tconst afterPad = Math.max(0, afterTarget - base.afterWidth);\n\n\t\t// Compose result\n\t\tconst r = TUI.SEGMENT_RESET;\n\t\tconst result =\n\t\t\tbase.before +\n\t\t\t\" \".repeat(beforePad) +\n\t\t\tr +\n\t\t\toverlay.text +\n\t\t\t\" \".repeat(overlayPad) +\n\t\t\tr +\n\t\t\tbase.after +\n\t\t\t\" \".repeat(afterPad);\n\n\t\t// CRITICAL: Always verify and truncate to terminal width.\n\t\t// This is the final safeguard against width overflow which would crash the TUI.\n\t\t// Width tracking can drift from actual visible width due to:\n\t\t// - Complex ANSI/OSC sequences (hyperlinks, colors)\n\t\t// - Wide characters at segment boundaries\n\t\t// - Edge cases in segment extraction\n\t\tconst resultWidth = visibleWidth(result);\n\t\tif (resultWidth <= totalWidth) {\n\t\t\treturn result;\n\t\t}\n\t\t// Truncate with strict=true to ensure we don't exceed totalWidth\n\t\treturn sliceByColumn(result, 0, totalWidth, true);\n\t}\n\n\t/**\n\t * Find and extract cursor position from rendered lines.\n\t * Searches for CURSOR_MARKER, calculates its position, and strips it from the output.\n\t * Only scans the bottom terminal height lines (visible viewport).\n\t * @param lines - Rendered lines to search\n\t * @param height - Terminal height (visible viewport size)\n\t * @returns Cursor position { row, col } or null if no marker found\n\t */\n\tprivate extractCursorPosition(lines: string[], height: number): { row: number; col: number } | null {\n\t\t// Only scan the bottom `height` lines (visible viewport)\n\t\tconst viewportTop = Math.max(0, lines.length - height);\n\t\tfor (let row = lines.length - 1; row >= viewportTop; row--) {\n\t\t\tconst line = lines[row];\n\t\t\tconst markerIndex = line.indexOf(CURSOR_MARKER);\n\t\t\tif (markerIndex !== -1) {\n\t\t\t\t// Calculate visual column (width of text before marker)\n\t\t\t\tconst beforeMarker = line.slice(0, markerIndex);\n\t\t\t\tconst col = visibleWidth(beforeMarker);\n\n\t\t\t\t// Strip marker from the line\n\t\t\t\tlines[row] = line.slice(0, markerIndex) + line.slice(markerIndex + CURSOR_MARKER.length);\n\n\t\t\t\treturn { row, col };\n\t\t\t}\n\t\t}\n\t\treturn null;\n\t}\n\n\tprivate doRender(): void {\n\t\tif (this.stopped) return;\n\t\tconst width = this.terminal.columns;\n\t\tconst height = this.terminal.rows;\n\t\tconst widthChanged = this.previousWidth !== 0 && this.previousWidth !== width;\n\t\tconst heightChanged = this.previousHeight !== 0 && this.previousHeight !== height;\n\t\tconst previousBufferLength = this.previousHeight > 0 ? this.previousViewportTop + this.previousHeight : height;\n\t\tlet prevViewportTop = heightChanged ? Math.max(0, previousBufferLength - height) : this.previousViewportTop;\n\t\tlet viewportTop = prevViewportTop;\n\t\tlet hardwareCursorRow = this.hardwareCursorRow;\n\t\tconst computeLineDiff = (targetRow: number): number => {\n\t\t\tconst currentScreenRow = hardwareCursorRow - prevViewportTop;\n\t\t\tconst targetScreenRow = targetRow - viewportTop;\n\t\t\treturn targetScreenRow - currentScreenRow;\n\t\t};\n\n\t\t// Render all components to get new lines\n\t\tlet newLines = this.render(width);\n\n\t\t// Composite overlays into the rendered lines (before differential compare)\n\t\tif (this.overlayStack.length > 0) {\n\t\t\tnewLines = this.compositeOverlays(newLines, width, height);\n\t\t}\n\n\t\t// Extract cursor position before applying line resets (marker must be found first)\n\t\tconst cursorPos = this.extractCursorPosition(newLines, height);\n\n\t\tnewLines = this.applyLineResets(newLines);\n\n\t\t// Helper to clear scrollback and viewport and render all new lines\n\t\tconst fullRender = (clear: boolean): void => {\n\t\t\tthis.fullRedrawCount += 1;\n\t\t\tlet buffer = \"\\x1b[?2026h\"; // Begin synchronized output\n\t\t\tif (clear) {\n\t\t\t\tbuffer += this.deleteKittyImages(this.previousKittyImageIds);\n\t\t\t\tbuffer += \"\\x1b[2J\\x1b[H\\x1b[3J\"; // Clear screen, home, then clear scrollback\n\t\t\t}\n\t\t\tfor (let i = 0; i < newLines.length; i++) {\n\t\t\t\tif (i > 0) buffer += \"\\r\\n\";\n\t\t\t\tbuffer += newLines[i];\n\t\t\t}\n\t\t\tbuffer += \"\\x1b[?2026l\"; // End synchronized output\n\t\t\tthis.terminal.write(buffer);\n\t\t\tthis.cursorRow = Math.max(0, newLines.length - 1);\n\t\t\tthis.hardwareCursorRow = this.cursorRow;\n\t\t\t// Reset max lines when clearing, otherwise track growth\n\t\t\tif (clear) {\n\t\t\t\tthis.maxLinesRendered = newLines.length;\n\t\t\t} else {\n\t\t\t\tthis.maxLinesRendered = Math.max(this.maxLinesRendered, newLines.length);\n\t\t\t}\n\t\t\tconst bufferLength = Math.max(height, newLines.length);\n\t\t\tthis.previousViewportTop = Math.max(0, bufferLength - height);\n\t\t\tthis.positionHardwareCursor(cursorPos, newLines.length);\n\t\t\tthis.previousLines = newLines;\n\t\t\tthis.previousKittyImageIds = this.collectKittyImageIds(newLines);\n\t\t\tthis.previousWidth = width;\n\t\t\tthis.previousHeight = height;\n\t\t};\n\n\t\tconst debugRedraw = process.env.PI_DEBUG_REDRAW === \"1\";\n\t\tconst logRedraw = (reason: string): void => {\n\t\t\tif (!debugRedraw) return;\n\t\t\tconst logPath = path.join(os.homedir(), \".pi\", \"agent\", \"pi-debug.log\");\n\t\t\tconst msg = `[${new Date().toISOString()}] fullRender: ${reason} (prev=${this.previousLines.length}, new=${newLines.length}, height=${height})\\n`;\n\t\t\tfs.appendFileSync(logPath, msg);\n\t\t};\n\n\t\t// First render - just output everything without clearing (assumes clean screen)\n\t\tif (this.previousLines.length === 0 && !widthChanged && !heightChanged) {\n\t\t\tlogRedraw(\"first render\");\n\t\t\tfullRender(false);\n\t\t\treturn;\n\t\t}\n\n\t\t// Width changes always need a full re-render because wrapping changes.\n\t\tif (widthChanged) {\n\t\t\tlogRedraw(`terminal width changed (${this.previousWidth} -> ${width})`);\n\t\t\tfullRender(true);\n\t\t\treturn;\n\t\t}\n\n\t\t// Height changes normally need a full re-render to keep the visible viewport aligned,\n\t\t// but Termux changes height when the software keyboard shows or hides.\n\t\t// In that environment, a full redraw causes the entire history to replay on every toggle.\n\t\tif (heightChanged && !isTermuxSession()) {\n\t\t\tlogRedraw(`terminal height changed (${this.previousHeight} -> ${height})`);\n\t\t\tfullRender(true);\n\t\t\treturn;\n\t\t}\n\n\t\t// Content shrunk below the working area and no overlays - re-render to clear empty rows\n\t\t// (overlays need the padding, so only do this when no overlays are active)\n\t\t// Configurable via setClearOnShrink() or PI_CLEAR_ON_SHRINK=0 env var\n\t\tif (this.clearOnShrink && newLines.length < this.maxLinesRendered && this.overlayStack.length === 0) {\n\t\t\tlogRedraw(`clearOnShrink (maxLinesRendered=${this.maxLinesRendered})`);\n\t\t\tfullRender(true);\n\t\t\treturn;\n\t\t}\n\n\t\t// Find first and last changed lines\n\t\tlet firstChanged = -1;\n\t\tlet lastChanged = -1;\n\t\tconst maxLines = Math.max(newLines.length, this.previousLines.length);\n\t\tfor (let i = 0; i < maxLines; i++) {\n\t\t\tconst oldLine = i < this.previousLines.length ? this.previousLines[i] : \"\";\n\t\t\tconst newLine = i < newLines.length ? newLines[i] : \"\";\n\n\t\t\tif (oldLine !== newLine) {\n\t\t\t\tif (firstChanged === -1) {\n\t\t\t\t\tfirstChanged = i;\n\t\t\t\t}\n\t\t\t\tlastChanged = i;\n\t\t\t}\n\t\t}\n\t\tconst appendedLines = newLines.length > this.previousLines.length;\n\t\tif (appendedLines) {\n\t\t\tif (firstChanged === -1) {\n\t\t\t\tfirstChanged = this.previousLines.length;\n\t\t\t}\n\t\t\tlastChanged = newLines.length - 1;\n\t\t}\n\t\tif (firstChanged !== -1) {\n\t\t\tlastChanged = this.expandLastChangedForKittyImages(firstChanged, lastChanged);\n\t\t}\n\t\tconst appendStart = appendedLines && firstChanged === this.previousLines.length && firstChanged > 0;\n\n\t\t// No changes - but still need to update hardware cursor position if it moved\n\t\tif (firstChanged === -1) {\n\t\t\tthis.positionHardwareCursor(cursorPos, newLines.length);\n\t\t\tthis.previousViewportTop = prevViewportTop;\n\t\t\tthis.previousHeight = height;\n\t\t\treturn;\n\t\t}\n\n\t\t// All changes are in deleted lines (nothing to render, just clear)\n\t\tif (firstChanged >= newLines.length) {\n\t\t\tif (this.previousLines.length > newLines.length) {\n\t\t\t\tlet buffer = \"\\x1b[?2026h\";\n\t\t\t\tbuffer += this.deleteChangedKittyImages(firstChanged, lastChanged);\n\t\t\t\t// Move to end of new content (clamp to 0 for empty content)\n\t\t\t\tconst targetRow = Math.max(0, newLines.length - 1);\n\t\t\t\tif (targetRow < prevViewportTop) {\n\t\t\t\t\tlogRedraw(`deleted lines moved viewport up (${targetRow} < ${prevViewportTop})`);\n\t\t\t\t\tfullRender(true);\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\tconst lineDiff = computeLineDiff(targetRow);\n\t\t\t\tif (lineDiff > 0) buffer += `\\x1b[${lineDiff}B`;\n\t\t\t\telse if (lineDiff < 0) buffer += `\\x1b[${-lineDiff}A`;\n\t\t\t\tbuffer += \"\\r\";\n\t\t\t\t// Clear extra lines without scrolling\n\t\t\t\tconst extraLines = this.previousLines.length - newLines.length;\n\t\t\t\tif (extraLines > height) {\n\t\t\t\t\tlogRedraw(`extraLines > height (${extraLines} > ${height})`);\n\t\t\t\t\tfullRender(true);\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\tif (extraLines > 0) {\n\t\t\t\t\tbuffer += \"\\x1b[1B\";\n\t\t\t\t}\n\t\t\t\tfor (let i = 0; i < extraLines; i++) {\n\t\t\t\t\tbuffer += \"\\r\\x1b[2K\";\n\t\t\t\t\tif (i < extraLines - 1) buffer += \"\\x1b[1B\";\n\t\t\t\t}\n\t\t\t\tif (extraLines > 0) {\n\t\t\t\t\tbuffer += `\\x1b[${extraLines}A`;\n\t\t\t\t}\n\t\t\t\tbuffer += \"\\x1b[?2026l\";\n\t\t\t\tthis.terminal.write(buffer);\n\t\t\t\tthis.cursorRow = targetRow;\n\t\t\t\tthis.hardwareCursorRow = targetRow;\n\t\t\t}\n\t\t\tthis.positionHardwareCursor(cursorPos, newLines.length);\n\t\t\tthis.previousLines = newLines;\n\t\t\tthis.previousKittyImageIds = this.collectKittyImageIds(newLines);\n\t\t\tthis.previousWidth = width;\n\t\t\tthis.previousHeight = height;\n\t\t\tthis.previousViewportTop = prevViewportTop;\n\t\t\treturn;\n\t\t}\n\n\t\t// Differential rendering can only touch what was actually visible.\n\t\t// If the first changed line is above the previous viewport, we need a full redraw.\n\t\tif (firstChanged < prevViewportTop) {\n\t\t\tlogRedraw(`firstChanged < viewportTop (${firstChanged} < ${prevViewportTop})`);\n\t\t\tfullRender(true);\n\t\t\treturn;\n\t\t}\n\n\t\t// Render from first changed line to end\n\t\t// Build buffer with all updates wrapped in synchronized output\n\t\tlet buffer = \"\\x1b[?2026h\"; // Begin synchronized output\n\t\tbuffer += this.deleteChangedKittyImages(firstChanged, lastChanged);\n\t\tconst prevViewportBottom = prevViewportTop + height - 1;\n\t\tconst moveTargetRow = appendStart ? firstChanged - 1 : firstChanged;\n\t\tif (moveTargetRow > prevViewportBottom) {\n\t\t\tconst currentScreenRow = Math.max(0, Math.min(height - 1, hardwareCursorRow - prevViewportTop));\n\t\t\tconst moveToBottom = height - 1 - currentScreenRow;\n\t\t\tif (moveToBottom > 0) {\n\t\t\t\tbuffer += `\\x1b[${moveToBottom}B`;\n\t\t\t}\n\t\t\tconst scroll = moveTargetRow - prevViewportBottom;\n\t\t\tbuffer += \"\\r\\n\".repeat(scroll);\n\t\t\tprevViewportTop += scroll;\n\t\t\tviewportTop += scroll;\n\t\t\thardwareCursorRow = moveTargetRow;\n\t\t}\n\n\t\t// Move cursor to first changed line (use hardwareCursorRow for actual position)\n\t\tconst lineDiff = computeLineDiff(moveTargetRow);\n\t\tif (lineDiff > 0) {\n\t\t\tbuffer += `\\x1b[${lineDiff}B`; // Move down\n\t\t} else if (lineDiff < 0) {\n\t\t\tbuffer += `\\x1b[${-lineDiff}A`; // Move up\n\t\t}\n\n\t\tbuffer += appendStart ? \"\\r\\n\" : \"\\r\"; // Move to column 0\n\n\t\t// Only render changed lines (firstChanged to lastChanged), not all lines to end\n\t\t// This reduces flicker when only a single line changes (e.g., spinner animation)\n\t\tconst renderEnd = Math.min(lastChanged, newLines.length - 1);\n\t\tfor (let i = firstChanged; i <= renderEnd; i++) {\n\t\t\tif (i > firstChanged) buffer += \"\\r\\n\";\n\t\t\tbuffer += \"\\x1b[2K\"; // Clear current line\n\t\t\tconst line = newLines[i];\n\t\t\tconst isImage = isImageLine(line);\n\t\t\tif (!isImage && visibleWidth(line) > width) {\n\t\t\t\t// Log all lines to crash file for debugging\n\t\t\t\tconst crashLogPath = path.join(os.homedir(), \".pi\", \"agent\", \"pi-crash.log\");\n\t\t\t\tconst crashData = [\n\t\t\t\t\t`Crash at ${new Date().toISOString()}`,\n\t\t\t\t\t`Terminal width: ${width}`,\n\t\t\t\t\t`Line ${i} visible width: ${visibleWidth(line)}`,\n\t\t\t\t\t\"\",\n\t\t\t\t\t\"=== All rendered lines ===\",\n\t\t\t\t\t...newLines.map((l, idx) => `[${idx}] (w=${visibleWidth(l)}) ${l}`),\n\t\t\t\t\t\"\",\n\t\t\t\t].join(\"\\n\");\n\t\t\t\tfs.mkdirSync(path.dirname(crashLogPath), { recursive: true });\n\t\t\t\tfs.writeFileSync(crashLogPath, crashData);\n\n\t\t\t\t// Clean up terminal state before throwing\n\t\t\t\tthis.stop();\n\n\t\t\t\tconst errorMsg = [\n\t\t\t\t\t`Rendered line ${i} exceeds terminal width (${visibleWidth(line)} > ${width}).`,\n\t\t\t\t\t\"\",\n\t\t\t\t\t\"This is likely caused by a custom TUI component not truncating its output.\",\n\t\t\t\t\t\"Use visibleWidth() to measure and truncateToWidth() to truncate lines.\",\n\t\t\t\t\t\"\",\n\t\t\t\t\t`Debug log written to: ${crashLogPath}`,\n\t\t\t\t].join(\"\\n\");\n\t\t\t\tthrow new Error(errorMsg);\n\t\t\t}\n\t\t\tbuffer += line;\n\t\t}\n\n\t\t// Track where cursor ended up after rendering\n\t\tlet finalCursorRow = renderEnd;\n\n\t\t// If we had more lines before, clear them and move cursor back\n\t\tif (this.previousLines.length > newLines.length) {\n\t\t\t// Move to end of new content first if we stopped before it\n\t\t\tif (renderEnd < newLines.length - 1) {\n\t\t\t\tconst moveDown = newLines.length - 1 - renderEnd;\n\t\t\t\tbuffer += `\\x1b[${moveDown}B`;\n\t\t\t\tfinalCursorRow = newLines.length - 1;\n\t\t\t}\n\t\t\tconst extraLines = this.previousLines.length - newLines.length;\n\t\t\tfor (let i = newLines.length; i < this.previousLines.length; i++) {\n\t\t\t\tbuffer += \"\\r\\n\\x1b[2K\";\n\t\t\t}\n\t\t\t// Move cursor back to end of new content\n\t\t\tbuffer += `\\x1b[${extraLines}A`;\n\t\t}\n\n\t\tbuffer += \"\\x1b[?2026l\"; // End synchronized output\n\n\t\tif (process.env.PI_TUI_DEBUG === \"1\") {\n\t\t\tconst debugDir = \"/tmp/tui\";\n\t\t\tfs.mkdirSync(debugDir, { recursive: true });\n\t\t\tconst debugPath = path.join(debugDir, `render-${Date.now()}-${Math.random().toString(36).slice(2)}.log`);\n\t\t\tconst debugData = [\n\t\t\t\t`firstChanged: ${firstChanged}`,\n\t\t\t\t`viewportTop: ${viewportTop}`,\n\t\t\t\t`cursorRow: ${this.cursorRow}`,\n\t\t\t\t`height: ${height}`,\n\t\t\t\t`lineDiff: ${lineDiff}`,\n\t\t\t\t`hardwareCursorRow: ${hardwareCursorRow}`,\n\t\t\t\t`renderEnd: ${renderEnd}`,\n\t\t\t\t`finalCursorRow: ${finalCursorRow}`,\n\t\t\t\t`cursorPos: ${JSON.stringify(cursorPos)}`,\n\t\t\t\t`newLines.length: ${newLines.length}`,\n\t\t\t\t`previousLines.length: ${this.previousLines.length}`,\n\t\t\t\t\"\",\n\t\t\t\t\"=== newLines ===\",\n\t\t\t\tJSON.stringify(newLines, null, 2),\n\t\t\t\t\"\",\n\t\t\t\t\"=== previousLines ===\",\n\t\t\t\tJSON.stringify(this.previousLines, null, 2),\n\t\t\t\t\"\",\n\t\t\t\t\"=== buffer ===\",\n\t\t\t\tJSON.stringify(buffer),\n\t\t\t].join(\"\\n\");\n\t\t\tfs.writeFileSync(debugPath, debugData);\n\t\t}\n\n\t\t// Write entire buffer at once\n\t\tthis.terminal.write(buffer);\n\n\t\t// Track cursor position for next render\n\t\t// cursorRow tracks end of content (for viewport calculation)\n\t\t// hardwareCursorRow tracks actual terminal cursor position (for movement)\n\t\tthis.cursorRow = Math.max(0, newLines.length - 1);\n\t\tthis.hardwareCursorRow = finalCursorRow;\n\t\t// Track terminal's working area (grows but doesn't shrink unless cleared)\n\t\tthis.maxLinesRendered = Math.max(this.maxLinesRendered, newLines.length);\n\t\tthis.previousViewportTop = Math.max(prevViewportTop, finalCursorRow - height + 1);\n\n\t\t// Position hardware cursor for IME\n\t\tthis.positionHardwareCursor(cursorPos, newLines.length);\n\n\t\tthis.previousLines = newLines;\n\t\tthis.previousKittyImageIds = this.collectKittyImageIds(newLines);\n\t\tthis.previousWidth = width;\n\t\tthis.previousHeight = height;\n\t}\n\n\t/**\n\t * Position the hardware cursor for IME candidate window.\n\t * @param cursorPos The cursor position extracted from rendered output, or null\n\t * @param totalLines Total number of rendered lines\n\t */\n\tprivate positionHardwareCursor(cursorPos: { row: number; col: number } | null, totalLines: number): void {\n\t\tif (!cursorPos || totalLines <= 0) {\n\t\t\tthis.terminal.hideCursor();\n\t\t\treturn;\n\t\t}\n\n\t\t// Clamp cursor position to valid range\n\t\tconst targetRow = Math.max(0, Math.min(cursorPos.row, totalLines - 1));\n\t\tconst targetCol = Math.max(0, cursorPos.col);\n\n\t\t// Move cursor from current position to target\n\t\tconst rowDelta = targetRow - this.hardwareCursorRow;\n\t\tlet buffer = \"\";\n\t\tif (rowDelta > 0) {\n\t\t\tbuffer += `\\x1b[${rowDelta}B`; // Move down\n\t\t} else if (rowDelta < 0) {\n\t\t\tbuffer += `\\x1b[${-rowDelta}A`; // Move up\n\t\t}\n\t\t// Move to absolute column (1-indexed)\n\t\tbuffer += `\\x1b[${targetCol + 1}G`;\n\n\t\tif (buffer) {\n\t\t\tthis.terminal.write(buffer);\n\t\t}\n\n\t\tthis.hardwareCursorRow = targetRow;\n\t\tif (this.showHardwareCursor) {\n\t\t\tthis.terminal.showCursor();\n\t\t} else {\n\t\t\tthis.terminal.hideCursor();\n\t\t}\n\t}\n}\n"]}