Function scanDistributions

packages/python-analysis/src/manifest/dist-metadata.ts:120–219

(
  sitePackagesDir: string
)

 * @returns Map of normalized package name to distribution info
 */
export async function scanDistributions(
  sitePackagesDir: string
): Promise<DistributionIndex> {
  const mod = await importWasmModule();
  const index: DistributionIndex = new Map();

  // List all .dist-info directories
  let entries: string[];
  try {
    entries = await readdir(sitePackagesDir);
  } catch {
    return index;
  }

  const distInfoDirs = entries.filter(e => e.endsWith('.dist-info'));

  for (const dirName of distInfoDirs) {
    const distInfoPath = join(sitePackagesDir, dirName);

    // METADATA is required
    const metadataContent = await readDistInfoFile(distInfoPath, 'METADATA');
    if (!metadataContent) {
      console.debug(`Missing METADATA in ${dirName}`);
      continue;
    }

    // Parse METADATA via WASM
    let metadata;
    try {
      metadata = mod.parseDistMetadata(
        new TextEncoder().encode(metadataContent)
      );
    } catch (e) {
      console.debug(`Failed to parse METADATA for ${dirName}: ${e}`);
      continue;
    }

    // Normalize the package name
    const normalizedName = mod.normalizePackageName(metadata.name);

    // Parse RECORD (optional) -- analogous to Distribution.files
    let files: PackagePath[] = [];
    const recordContent = await readDistInfoFile(distInfoPath, 'RECORD');
    if (recordContent) {
      try {
        files = mod.parseRecord(recordContent);
      } catch (e) {
        console.warn(`Failed to parse RECORD for ${dirName}: ${e}`);
      }
    }

    // Parse direct_url.json (optional) -- analogous to Distribution.origin
    let origin: DirectUrlInfo | undefined;
    const directUrlContent = await readDistInfoFile(
      distInfoPath,
      'direct_url.json'
    );
    if (directUrlContent) {