move pi-mono into companion-cloud as apps/companion-os

- Copy all pi-mono source into apps/companion-os/
- Update Dockerfile to COPY pre-built binary instead of downloading from GitHub Releases
- Update deploy-staging.yml to build pi from source (bun compile) before Docker build
- Add apps/companion-os/** to path triggers
- No more cross-repo dispatch needed

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/coding-agent/src/core/tools/truncate.ts

@@ -0,0 +1,279 @@
+/**
+ * Shared truncation utilities for tool outputs.
+ *
+ * Truncation is based on two independent limits - whichever is hit first wins:
+ * - Line limit (default: 2000 lines)
+ * - Byte limit (default: 50KB)
+ *
+ * Never returns partial lines (except bash tail truncation edge case).
+ */
+
+export const DEFAULT_MAX_LINES = 2000;
+export const DEFAULT_MAX_BYTES = 50 * 1024; // 50KB
+export const GREP_MAX_LINE_LENGTH = 500; // Max chars per grep match line
+
+export interface TruncationResult {
+  /** The truncated content */
+  content: string;
+  /** Whether truncation occurred */
+  truncated: boolean;
+  /** Which limit was hit: "lines", "bytes", or null if not truncated */
+  truncatedBy: "lines" | "bytes" | null;
+  /** Total number of lines in the original content */
+  totalLines: number;
+  /** Total number of bytes in the original content */
+  totalBytes: number;
+  /** Number of complete lines in the truncated output */
+  outputLines: number;
+  /** Number of bytes in the truncated output */
+  outputBytes: number;
+  /** Whether the last line was partially truncated (only for tail truncation edge case) */
+  lastLinePartial: boolean;
+  /** Whether the first line exceeded the byte limit (for head truncation) */
+  firstLineExceedsLimit: boolean;
+  /** The max lines limit that was applied */
+  maxLines: number;
+  /** The max bytes limit that was applied */
+  maxBytes: number;
+}
+
+export interface TruncationOptions {
+  /** Maximum number of lines (default: 2000) */
+  maxLines?: number;
+  /** Maximum number of bytes (default: 50KB) */
+  maxBytes?: number;
+}
+
+/**
+ * Format bytes as human-readable size.
+ */
+export function formatSize(bytes: number): string {
+  if (bytes < 1024) {
+    return `${bytes}B`;
+  } else if (bytes < 1024 * 1024) {
+    return `${(bytes / 1024).toFixed(1)}KB`;
+  } else {
+    return `${(bytes / (1024 * 1024)).toFixed(1)}MB`;
+  }
+}
+
+/**
+ * Truncate content from the head (keep first N lines/bytes).
+ * Suitable for file reads where you want to see the beginning.
+ *
+ * Never returns partial lines. If first line exceeds byte limit,
+ * returns empty content with firstLineExceedsLimit=true.
+ */
+export function truncateHead(
+  content: string,
+  options: TruncationOptions = {},
+): TruncationResult {
+  const maxLines = options.maxLines ?? DEFAULT_MAX_LINES;
+  const maxBytes = options.maxBytes ?? DEFAULT_MAX_BYTES;
+
+  const totalBytes = Buffer.byteLength(content, "utf-8");
+  const lines = content.split("\n");
+  const totalLines = lines.length;
+
+  // Check if no truncation needed
+  if (totalLines <= maxLines && totalBytes <= maxBytes) {
+    return {
+      content,
+      truncated: false,
+      truncatedBy: null,
+      totalLines,
+      totalBytes,
+      outputLines: totalLines,
+      outputBytes: totalBytes,
+      lastLinePartial: false,
+      firstLineExceedsLimit: false,
+      maxLines,
+      maxBytes,
+    };
+  }
+
+  // Check if first line alone exceeds byte limit
+  const firstLineBytes = Buffer.byteLength(lines[0], "utf-8");
+  if (firstLineBytes > maxBytes) {
+    return {
+      content: "",
+      truncated: true,
+      truncatedBy: "bytes",
+      totalLines,
+      totalBytes,
+      outputLines: 0,
+      outputBytes: 0,
+      lastLinePartial: false,
+      firstLineExceedsLimit: true,
+      maxLines,
+      maxBytes,
+    };
+  }
+
+  // Collect complete lines that fit
+  const outputLinesArr: string[] = [];
+  let outputBytesCount = 0;
+  let truncatedBy: "lines" | "bytes" = "lines";
+
+  for (let i = 0; i < lines.length && i < maxLines; i++) {
+    const line = lines[i];
+    const lineBytes = Buffer.byteLength(line, "utf-8") + (i > 0 ? 1 : 0); // +1 for newline
+
+    if (outputBytesCount + lineBytes > maxBytes) {
+      truncatedBy = "bytes";
+      break;
+    }
+
+    outputLinesArr.push(line);
+    outputBytesCount += lineBytes;
+  }
+
+  // If we exited due to line limit
+  if (outputLinesArr.length >= maxLines && outputBytesCount <= maxBytes) {
+    truncatedBy = "lines";
+  }
+
+  const outputContent = outputLinesArr.join("\n");
+  const finalOutputBytes = Buffer.byteLength(outputContent, "utf-8");
+
+  return {
+    content: outputContent,
+    truncated: true,
+    truncatedBy,
+    totalLines,
+    totalBytes,
+    outputLines: outputLinesArr.length,
+    outputBytes: finalOutputBytes,
+    lastLinePartial: false,
+    firstLineExceedsLimit: false,
+    maxLines,
+    maxBytes,
+  };
+}
+
+/**
+ * Truncate content from the tail (keep last N lines/bytes).
+ * Suitable for bash output where you want to see the end (errors, final results).
+ *
+ * May return partial first line if the last line of original content exceeds byte limit.
+ */
+export function truncateTail(
+  content: string,
+  options: TruncationOptions = {},
+): TruncationResult {
+  const maxLines = options.maxLines ?? DEFAULT_MAX_LINES;
+  const maxBytes = options.maxBytes ?? DEFAULT_MAX_BYTES;
+
+  const totalBytes = Buffer.byteLength(content, "utf-8");
+  const lines = content.split("\n");
+  const totalLines = lines.length;
+
+  // Check if no truncation needed
+  if (totalLines <= maxLines && totalBytes <= maxBytes) {
+    return {
+      content,
+      truncated: false,
+      truncatedBy: null,
+      totalLines,
+      totalBytes,
+      outputLines: totalLines,
+      outputBytes: totalBytes,
+      lastLinePartial: false,
+      firstLineExceedsLimit: false,
+      maxLines,
+      maxBytes,
+    };
+  }
+
+  // Work backwards from the end
+  const outputLinesArr: string[] = [];
+  let outputBytesCount = 0;
+  let truncatedBy: "lines" | "bytes" = "lines";
+  let lastLinePartial = false;
+
+  for (
+    let i = lines.length - 1;
+    i >= 0 && outputLinesArr.length < maxLines;
+    i--
+  ) {
+    const line = lines[i];
+    const lineBytes =
+      Buffer.byteLength(line, "utf-8") + (outputLinesArr.length > 0 ? 1 : 0); // +1 for newline
+
+    if (outputBytesCount + lineBytes > maxBytes) {
+      truncatedBy = "bytes";
+      // Edge case: if we haven't added ANY lines yet and this line exceeds maxBytes,
+      // take the end of the line (partial)
+      if (outputLinesArr.length === 0) {
+        const truncatedLine = truncateStringToBytesFromEnd(line, maxBytes);
+        outputLinesArr.unshift(truncatedLine);
+        outputBytesCount = Buffer.byteLength(truncatedLine, "utf-8");
+        lastLinePartial = true;
+      }
+      break;
+    }
+
+    outputLinesArr.unshift(line);
+    outputBytesCount += lineBytes;
+  }
+
+  // If we exited due to line limit
+  if (outputLinesArr.length >= maxLines && outputBytesCount <= maxBytes) {
+    truncatedBy = "lines";
+  }
+
+  const outputContent = outputLinesArr.join("\n");
+  const finalOutputBytes = Buffer.byteLength(outputContent, "utf-8");
+
+  return {
+    content: outputContent,
+    truncated: true,
+    truncatedBy,
+    totalLines,
+    totalBytes,
+    outputLines: outputLinesArr.length,
+    outputBytes: finalOutputBytes,
+    lastLinePartial,
+    firstLineExceedsLimit: false,
+    maxLines,
+    maxBytes,
+  };
+}
+
+/**
+ * Truncate a string to fit within a byte limit (from the end).
+ * Handles multi-byte UTF-8 characters correctly.
+ */
+function truncateStringToBytesFromEnd(str: string, maxBytes: number): string {
+  const buf = Buffer.from(str, "utf-8");
+  if (buf.length <= maxBytes) {
+    return str;
+  }
+
+  // Start from the end, skip maxBytes back
+  let start = buf.length - maxBytes;
+
+  // Find a valid UTF-8 boundary (start of a character)
+  while (start < buf.length && (buf[start] & 0xc0) === 0x80) {
+    start++;
+  }
+
+  return buf.slice(start).toString("utf-8");
+}
+
+/**
+ * Truncate a single line to max characters, adding [truncated] suffix.
+ * Used for grep match lines.
+ */
+export function truncateLine(
+  line: string,
+  maxChars: number = GREP_MAX_LINE_LENGTH,
+): { text: string; wasTruncated: boolean } {
+  if (line.length <= maxChars) {
+    return { text: line, wasTruncated: false };
+  }
+  return {
+    text: `${line.slice(0, maxChars)}... [truncated]`,
+    wasTruncated: true,
+  };
+}