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import fs from "node:fs/promises";import type { Dirent } from "node:fs";import path from "node:path";import { runProcess } from "./processRunner"; import {  projectSearchEntriesInputSchema,  type ProjectEntry,  type ProjectSearchEntriesInput,  type ProjectSearchEntriesResult,} from "@t3tools/contracts"; const WORKSPACE_CACHE_TTL_MS = 15_000;const WORKSPACE_CACHE_MAX_KEYS = 4;const WORKSPACE_INDEX_MAX_ENTRIES = 25_000;const IGNORED_DIRECTORY_NAMES = new Set([  ".git",  ".convex",  "node_modules",  ".next",  ".turbo",  "dist",  "build",  "out",  ".cache",]); interface WorkspaceIndex {  scannedAt: number;  entries: ProjectEntry[];  truncated: boolean;} const workspaceIndexCache = new Map<string, WorkspaceIndex>(); function toPosixPath(input: string): string {  return input.split(path.sep).join("/");} function parentPathOf(input: string): string | undefined {  const separatorIndex = input.lastIndexOf("/");  if (separatorIndex === -1) {    return undefined;  }  return input.slice(0, separatorIndex);} function basenameOf(input: string): string {  const separatorIndex = input.lastIndexOf("/");  if (separatorIndex === -1) {    return input;  }  return input.slice(separatorIndex + 1);} function normalizeQuery(input: string): string {  return input.trim().replace(/^@?(\.\/)?/, "").toLowerCase();} function scoreEntry(entry: ProjectEntry, query: string): number {  if (!query) {    return entry.kind === "directory" ? 0 : 1;  }   const normalizedPath = entry.path.toLowerCase();  const normalizedName = basenameOf(normalizedPath);   if (normalizedName === query) return 0;  if (normalizedPath === query) return 1;  if (normalizedName.startsWith(query)) return 2;  if (normalizedPath.startsWith(query)) return 3;  if (normalizedPath.includes(`/${query}`)) return 4;  return 5;} function isPathInIgnoredDirectory(relativePath: string): boolean {  const firstSegment = relativePath.split("/")[0];  if (!firstSegment) return false;  return IGNORED_DIRECTORY_NAMES.has(firstSegment);} function splitNullSeparatedPaths(input: string, truncated: boolean): string[] {  const parts = input.split("\0");  if (parts.length === 0) return [];   // If output was truncated, the final token can be partial.  if (truncated && parts[parts.length - 1]?.length) {    parts.pop();  }   return parts.filter((value) => value.length > 0);} function directoryAncestorsOf(relativePath: string): string[] {  const segments = relativePath.split("/").filter((segment) => segment.length > 0);  if (segments.length <= 1) return [];  const directories: string[] = [];  for (let index = 1; index < segments.length; index += 1) {    directories.push(segments.slice(0, index).join("/"));  }  return directories;} async function isInsideGitWorkTree(cwd: string): Promise<boolean> {  const insideWorkTree = await runProcess("git", ["rev-parse", "--is-inside-work-tree"], {    cwd,    allowNonZeroExit: true,    timeoutMs: 5_000,    maxBufferBytes: 4_096,  }).catch(() => null);  return Boolean(    insideWorkTree && insideWorkTree.code === 0 && insideWorkTree.stdout.trim() === "true",  );} async function filterGitIgnoredPaths(cwd: string, relativePaths: string[]): Promise<string[]> {  if (relativePaths.length === 0) {    return relativePaths;  }   const checkIgnore = await runProcess("git", ["check-ignore", "--no-index", "-z", "--stdin"], {    cwd,    allowNonZeroExit: true,    timeoutMs: 20_000,    maxBufferBytes: 16 * 1024 * 1024,    outputMode: "truncate",    stdin: `${relativePaths.join("\0")}\0`,  }).catch(() => null);  if (!checkIgnore) {    return relativePaths;  }   // git-check-ignore exits with 1 when no paths match.  if (checkIgnore.code !== 0 && checkIgnore.code !== 1) {    return relativePaths;  }   const ignoredPaths = new Set(    splitNullSeparatedPaths(checkIgnore.stdout, Boolean(checkIgnore.stdoutTruncated)),  );  if (ignoredPaths.size === 0) {    return relativePaths;  }   return relativePaths.filter((relativePath) => !ignoredPaths.has(relativePath));} async function buildWorkspaceIndexFromGit(cwd: string): Promise<WorkspaceIndex | null> {  if (!(await isInsideGitWorkTree(cwd))) {    return null;  }   const listedFiles = await runProcess(    "git",    ["ls-files", "--cached", "--others", "--exclude-standard", "-z"],    {      cwd,      allowNonZeroExit: true,      timeoutMs: 20_000,      maxBufferBytes: 16 * 1024 * 1024,      outputMode: "truncate",    },  ).catch(() => null);  if (!listedFiles || listedFiles.code !== 0) {    return null;  }   const listedPaths = splitNullSeparatedPaths(    listedFiles.stdout,    Boolean(listedFiles.stdoutTruncated),  )    .map((entry) => toPosixPath(entry))    .filter((entry) => entry.length > 0 && !isPathInIgnoredDirectory(entry));  const filePaths = await filterGitIgnoredPaths(cwd, listedPaths);   const directorySet = new Set<string>();  for (const filePath of filePaths) {    for (const directoryPath of directoryAncestorsOf(filePath)) {      if (!isPathInIgnoredDirectory(directoryPath)) {        directorySet.add(directoryPath);      }    }  }   const directoryEntries: ProjectEntry[] = [...directorySet]    .sort((left, right) => left.localeCompare(right))    .map((directoryPath) => ({      path: directoryPath,      kind: "directory",      parentPath: parentPathOf(directoryPath),    }));  const fileEntries: ProjectEntry[] = [...new Set(filePaths)]    .sort((left, right) => left.localeCompare(right))    .map((filePath) => ({      path: filePath,      kind: "file",      parentPath: parentPathOf(filePath),    }));   const entries = [...directoryEntries, ...fileEntries];  return {    scannedAt: Date.now(),    entries: entries.slice(0, WORKSPACE_INDEX_MAX_ENTRIES),    truncated:      Boolean(listedFiles.stdoutTruncated) || entries.length > WORKSPACE_INDEX_MAX_ENTRIES,  };} async function buildWorkspaceIndex(cwd: string): Promise<WorkspaceIndex> {  const gitIndexed = await buildWorkspaceIndexFromGit(cwd);  if (gitIndexed) {    return gitIndexed;  }  const shouldFilterWithGitIgnore = await isInsideGitWorkTree(cwd);   let pendingDirectories: string[] = [""];  const entries: ProjectEntry[] = [];  let truncated = false;   while (pendingDirectories.length > 0 && !truncated) {    const currentDirectories = pendingDirectories;    pendingDirectories = [];    const directoryEntries = await Promise.all(      currentDirectories.map(async (relativeDir) => {        const absoluteDir = relativeDir ? path.join(cwd, relativeDir) : cwd;        try {          const dirents = await fs.readdir(absoluteDir, { withFileTypes: true });          return { relativeDir, dirents };        } catch (error) {          if (!relativeDir) {            throw new Error(              `Unable to scan workspace entries at '${cwd}': ${error instanceof Error ? error.message : "unknown error"}`,              { cause: error },            );          }          return { relativeDir, dirents: null };        }      }),    );     const candidateEntriesByDirectory = directoryEntries.map((directoryEntry) => {      const { relativeDir, dirents } = directoryEntry;      if (!dirents) return [] as Array<{ dirent: Dirent; relativePath: string }>;       dirents.sort((left, right) => left.name.localeCompare(right.name));      const candidates: Array<{ dirent: Dirent; relativePath: string }> = [];      for (const dirent of dirents) {        if (!dirent.name || dirent.name === "." || dirent.name === "..") {          continue;        }        if (dirent.isDirectory() && IGNORED_DIRECTORY_NAMES.has(dirent.name)) {          continue;        }        if (!dirent.isDirectory() && !dirent.isFile()) {          continue;        }         const relativePath = toPosixPath(          relativeDir ? path.join(relativeDir, dirent.name) : dirent.name,        );        if (isPathInIgnoredDirectory(relativePath)) {          continue;        }        candidates.push({ dirent, relativePath });      }      return candidates;    });     const candidatePaths = candidateEntriesByDirectory.flatMap((candidateEntries) =>      candidateEntries.map((entry) => entry.relativePath),    );    const allowedPathSet = shouldFilterWithGitIgnore      ? new Set(await filterGitIgnoredPaths(cwd, candidatePaths))      : null;     for (const candidateEntries of candidateEntriesByDirectory) {      for (const candidate of candidateEntries) {        if (allowedPathSet && !allowedPathSet.has(candidate.relativePath)) {          continue;        }         const entry: ProjectEntry = {          path: candidate.relativePath,          kind: candidate.dirent.isDirectory() ? "directory" : "file",          parentPath: parentPathOf(candidate.relativePath),        };        entries.push(entry);         if (candidate.dirent.isDirectory()) {          pendingDirectories.push(candidate.relativePath);        }         if (entries.length >= WORKSPACE_INDEX_MAX_ENTRIES) {          truncated = true;          break;        }      }       if (truncated) {        break;      }    }  }   return {    scannedAt: Date.now(),    entries,    truncated,  };} async function getWorkspaceIndex(cwd: string): Promise<WorkspaceIndex> {  const cached = workspaceIndexCache.get(cwd);  if (cached && Date.now() - cached.scannedAt < WORKSPACE_CACHE_TTL_MS) {    return cached;  }   const next = await buildWorkspaceIndex(cwd);  workspaceIndexCache.set(cwd, next);  while (workspaceIndexCache.size > WORKSPACE_CACHE_MAX_KEYS) {    const oldestKey = workspaceIndexCache.keys().next().value;    if (!oldestKey) break;    workspaceIndexCache.delete(oldestKey);  }  return next;} export async function searchWorkspaceEntries(  input: ProjectSearchEntriesInput,): Promise<ProjectSearchEntriesResult> {  const parsed = projectSearchEntriesInputSchema.parse(input);  const index = await getWorkspaceIndex(parsed.cwd);  const normalizedQuery = normalizeQuery(parsed.query);  const candidates = normalizedQuery    ? index.entries.filter((entry) => entry.path.toLowerCase().includes(normalizedQuery))    : index.entries;   const ranked = candidates.toSorted((left, right) => {    const scoreDelta = scoreEntry(left, normalizedQuery) - scoreEntry(right, normalizedQuery);    if (scoreDelta !== 0) return scoreDelta;    return left.path.localeCompare(right.path);  });   return {    entries: ranked.slice(0, parsed.limit),    truncated: index.truncated || ranked.length > parsed.limit,  };}