Merge full retained transcript painting

Author: TheGreatAxios

src/tui-opentui/long-log.test.ts

@@ -1,120 +1,18 @@
 /**
- * Long-log window strategy — keep multi-thousand-line sessions interactive.
- * Pure slice math; shell paints only the window, not the full history.
- *
- * Budget (Wave 6 defaults; CL-5399 may refine):
- * - Painted window: last N rows (or pin around offset)
- * - Collapse threshold: when history exceeds this, older rows stay in the
- *   model but drop from the render tree until scrolled into the window
+ * Retention budget for a long-running transcript. The paint tree tracks
+ * `streamLog` 1:1 (see shell.ts's repaintTranscriptWindow/paintAppendStreamRow)
+ * so every retained row stays reachable by scrolling; this cap is what keeps
+ * that array — and so the paint tree — bounded over a long session.
  */
 
-import type { StreamRow } from "./stream.js"
-
-/** Rows kept in the paint tree under normal follow-tail. */
-export const LONG_LOG_WINDOW = 200
-
-/**
- * When total rows exceed this, append/scroll paths must use windowSlice
- * (never re-paint the full history).
- */
-export const LONG_LOG_COLLAPSE_THRESHOLD = 500
-
 /**
  * Retained tail of a stream log. Display-only state — the agent's own context
  * is kept separately — but an unbounded array still costs memory and O(n)
- * snapshot/diff work on every append over a long, tool-heavy session. Set
- * above the collapse threshold so eviction never fights the paint window.
+ * snapshot/diff work on every append over a long, tool-heavy session.
  */
 export const MAX_RETAINED_STREAM_ROWS = 600
 
 /** Rows to drop from the front of a log of this length to fit the cap. */
 export function retentionOverflow(length: number): number {
   return Math.max(0, length - MAX_RETAINED_STREAM_ROWS)
 }
-
-export type LongLogWindow = {
-  /** Inclusive start index into the full row log. */
-  readonly start: number
-  /** Exclusive end index. */
-  readonly end: number
-  /** Slice of rows to paint. */
-  readonly rows: readonly StreamRow[]
-  /** True when older rows exist above the window. */
-  readonly truncatedAbove: boolean
-  /** True when newer rows exist below the window (pinned). */
-  readonly truncatedBelow: boolean
-  /** Full log length. */
-  readonly total: number
-}
-
-export type WindowSliceOpts = {
-  /** Max rows to include (default LONG_LOG_WINDOW). */
-  readonly windowSize?: number
-  /**
-   * Pin the window so this index is visible (keep-active-visible style).
-   * When omitted, follow the tail (last windowSize rows).
-   */
-  readonly pinIndex?: number
-}
-
-/**
- * Compute which rows to paint for a long log.
- * Follow-tail by default; pinIndex keeps a historical row in view.
- */
-export function windowSlice(
-  log: readonly StreamRow[],
-  opts?: WindowSliceOpts,
-): LongLogWindow {
-  const total = log.length
-  const windowSize = Math.max(1, Math.floor(opts?.windowSize ?? LONG_LOG_WINDOW))
-
-  if (total === 0) {
-    return {
-      start: 0,
-      end: 0,
-      rows: [],
-      truncatedAbove: false,
-      truncatedBelow: false,
-      total: 0,
-    }
-  }
-
-  let end: number
-  let start: number
-
-  if (opts?.pinIndex !== undefined) {
-    const pin = Math.max(0, Math.min(total - 1, Math.floor(opts.pinIndex)))
-    // Center-ish: keep pin in window; prefer showing context after pin when possible.
-    start = Math.max(0, pin - Math.floor(windowSize / 2))
-    end = Math.min(total, start + windowSize)
-    start = Math.max(0, end - windowSize)
-  } else {
-    // Follow tail
-    end = total
-    start = Math.max(0, total - windowSize)
-  }
-
-  return {
-    start,
-    end,
-    rows: log.slice(start, end),
-    truncatedAbove: start > 0,
-    truncatedBelow: end < total,
-    total,
-  }
-}
-
-/** Whether the log is large enough that windowing is mandatory. */
-export function mustWindow(totalRows: number): boolean {
-  return totalRows > LONG_LOG_COLLAPSE_THRESHOLD
-}
-
-/**
- * Collapse marker line for the paint tree when truncatedAbove.
- * Pure string — shell styles it as system chrome.
- */
-export function collapseMarker(above: number): string {
-  const n = Math.max(0, Math.floor(above))
-  if (n <= 0) return ""
-  return `… ${n} earlier line${n === 1 ? "" : "s"} collapsed`
-}