/** * ExternalLauncher - external application launch service interface. * * Owns process launch helpers for browser URLs and workspace paths * in configured editor integrations. * * @module ExternalLauncher */import {  EDITORS,  ExternalLauncherError,  ExternalLauncherBrowserSpawnError,  ExternalLauncherCommandNotFoundError,  ExternalLauncherEditorSpawnError,  ExternalLauncherUnknownEditorError,  ExternalLauncherUnsupportedEditorError,  type EditorId,  type FileManagerRevealKind,  type LaunchEditorInput,} from "@t3tools/contracts";import { HostProcessPlatform } from "@t3tools/shared/hostProcess";import { isCommandAvailable, resolveSpawnCommand } from "@t3tools/shared/shell";import * as Clock from "effect/Clock";import * as Config from "effect/Config";import * as Context from "effect/Context";import * as Effect from "effect/Effect";import * as Encoding from "effect/Encoding";import * as FileSystem from "effect/FileSystem";import * as Layer from "effect/Layer";import * as Option from "effect/Option";import * as Path from "effect/Path";import * as Ref from "effect/Ref";import * as Stream from "effect/Stream";import * as ChildProcess from "effect/unstable/process/ChildProcess";import * as ChildProcessSpawner from "effect/unstable/process/ChildProcessSpawner"; // ==============================// Definitions// ============================== export {  ExternalLauncherError,  ExternalLauncherBrowserSpawnError,  ExternalLauncherCommandNotFoundError,  ExternalLauncherEditorSpawnError,  ExternalLauncherUnknownEditorError,  ExternalLauncherUnsupportedEditorError,  isExternalLauncherError,} from "@t3tools/contracts";export type { LaunchEditorInput };interface EditorLaunch {  readonly editor: EditorId;  readonly target: string;  readonly command: string;  readonly args: ReadonlyArray<string>;} interface ProcessLaunch {  readonly command: string;  readonly args: ReadonlyArray<string>;  readonly options: ChildProcess.CommandOptions;} interface TargetPathAndPosition {  readonly path: string;  readonly line: string;  readonly column: Option.Option<string>;} const TARGET_WITH_POSITION_PATTERN = /^(.*?):(\d+)(?::(\d+))?$/;const POWERSHELL_ARGUMENTS_PREFIX = [  "-NoProfile",  "-NonInteractive",  "-ExecutionPolicy",  "Bypass",  "-EncodedCommand",] as const; const DETACHED_IGNORE_STDIO_OPTIONS = {  detached: true,  stdin: "ignore",  stdout: "ignore",  stderr: "ignore",} as const satisfies ChildProcess.CommandOptions; const compactEnv = (input: Record<string, Option.Option<string>>): NodeJS.ProcessEnv =>  Object.fromEntries(    Object.entries(input).flatMap(([key, value]) =>      Option.match(value, {        onNone: () => [],        onSome: (resolved) => [[key, resolved]],      }),    ),  ); const BrowserLaunchEnvConfig = Config.all({  SYSTEMROOT: Config.string("SYSTEMROOT").pipe(Config.option),  windir: Config.string("windir").pipe(Config.option),  WSL_DISTRO_NAME: Config.string("WSL_DISTRO_NAME").pipe(Config.option),  WSL_INTEROP: Config.string("WSL_INTEROP").pipe(Config.option),  SSH_CONNECTION: Config.string("SSH_CONNECTION").pipe(Config.option),  SSH_TTY: Config.string("SSH_TTY").pipe(Config.option),  container: Config.string("container").pipe(Config.option),  DISPLAY: Config.string("DISPLAY").pipe(Config.option),  WAYLAND_DISPLAY: Config.string("WAYLAND_DISPLAY").pipe(Config.option),}).pipe(Config.map(compactEnv)); const CommandLookupEnvConfig = Config.all({  PATH: Config.string("PATH").pipe(Config.option),  Path: Config.string("Path").pipe(Config.option),  path: Config.string("path").pipe(Config.option),  PATHEXT: Config.string("PATHEXT").pipe(Config.option),}).pipe(Config.map(compactEnv)); const readBrowserLaunchEnv = BrowserLaunchEnvConfig.pipe(Effect.orElseSucceed(() => ({})));const readCommandLookupEnv = CommandLookupEnvConfig.pipe(Effect.orElseSucceed(() => ({}))); function parseTargetPathAndPosition(target: string): Option.Option<TargetPathAndPosition> {  const match = TARGET_WITH_POSITION_PATTERN.exec(target);  if (!match?.[1] || !match[2]) {    return Option.none();  }   return Option.some({    path: match[1],    line: match[2],    column: Option.fromUndefinedOr(match[3]),  });} function resolveCommandEditorArgs(  editor: (typeof EDITORS)[number],  target: string,): ReadonlyArray<string> {  const parsedTarget = parseTargetPathAndPosition(target);   switch (editor.launchStyle) {    case "direct-path":      return [target];    case "goto":      return Option.isSome(parsedTarget) ? ["--goto", target] : [target];    case "line-column":      return Option.match(parsedTarget, {        onNone: () => [target],        onSome: ({ path, line, column }) => [          "--line",          line,          ...Option.match(column, {            onNone: () => [],            onSome: (value) => ["--column", value],          }),          path,        ],      });  }} function resolveEditorArgs(  editor: (typeof EDITORS)[number],  target: string,): ReadonlyArray<string> {  const baseArgs = "baseArgs" in editor ? editor.baseArgs : [];  return [...baseArgs, ...resolveCommandEditorArgs(editor, target)];} const resolveAvailableCommand = Effect.fn("externalLauncher.resolveAvailableCommand")(function* (  commands: ReadonlyArray<string>,  env: NodeJS.ProcessEnv,): Effect.fn.Return<Option.Option<string>, never, FileSystem.FileSystem | Path.Path> {  for (const command of commands) {    if (yield* isCommandAvailable(command, { env })) {      return Option.some(command);    }  }  return Option.none();}); function encodeUtf16LeBase64(input: string): string {  const bytes = new Uint8Array(input.length * 2);  for (let index = 0; index < input.length; index += 1) {    const code = input.charCodeAt(index);    bytes[index * 2] = code & 0xff;    bytes[index * 2 + 1] = code >>> 8;  }  return Encoding.encodeBase64(bytes);} function escapePowerShellStringLiteral(input: string): string {  return `'${input.replaceAll("'", "''")}'`;} function resolvePowerShellPath(env: NodeJS.ProcessEnv = {}): string {  return `${env.SYSTEMROOT || env.windir || String.raw`C:\Windows`}\\System32\\WindowsPowerShell\\v1.0\\powershell.exe`;} function resolveWslPowerShellPath(): string {  return "/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe";} // File reveals from WSL resolve PowerShell through the interop PATH rather// than the fixed /mnt/c mount: the automount root is configurable, and a// PATH-resolved command keeps the advertised capability aligned with the// availability check `launchEditor` performs before spawning.const WSL_POWERSHELL_COMMAND = "powershell.exe"; function shouldUseWindowsHostFromWsl(  platform: NodeJS.Platform,  env: NodeJS.ProcessEnv = {},): boolean {  return (    platform === "linux" &&    (env.WSL_DISTRO_NAME !== undefined || env.WSL_INTEROP !== undefined) &&    env.SSH_CONNECTION === undefined &&    env.SSH_TTY === undefined &&    env.container === undefined  );} function resolveWindowsBrowserLaunch(target: string, command: string): ProcessLaunch {  const encodedCommand = encodeUtf16LeBase64(    `$ProgressPreference = 'SilentlyContinue'; Start ${escapePowerShellStringLiteral(target)}`,  );  return {    command,    args: [...POWERSHELL_ARGUMENTS_PREFIX, encodedCommand],    options: {      detached: true,      shell: false,      stdin: "ignore",      stdout: "ignore",      stderr: "ignore",    },  };} function hasGraphicalLinuxSession(env: NodeJS.ProcessEnv): boolean {  return [env.DISPLAY, env.WAYLAND_DISPLAY].some(    (value) => value !== undefined && value.trim().length > 0,  );} function fileManagerCommandForPlatform(  platform: NodeJS.Platform,  env: NodeJS.ProcessEnv,): string | undefined {  switch (platform) {    case "darwin":      return "open";    case "win32":      return "explorer";    default:      if (shouldUseWindowsHostFromWsl(platform, env)) {        return env.WSL_DISTRO_NAME?.trim() ? "explorer.exe" : undefined;      }      return hasGraphicalLinuxSession(env) ? "xdg-open" : undefined;  }} // A graphical session variable plus an executable `xdg-open` does not prove// that opening a directory does anything: without an `inode/directory` MIME// handler, `xdg-open` exits nonzero after the launcher has already detached,// so the client would see a silent no-op. Require the handler before// advertising the file manager on Linux.//// The probe carries its own timeout well inside the scan timeout// `server.getConfig` applies to editor discovery: that outer timeout degrades// to an empty editor list, so a hung `xdg-mime` (broken D-Bus or desktop// session) must cost only the file manager, not every discovered editor.const LINUX_DIRECTORY_HANDLER_PROBE_TIMEOUT = "2 seconds"; const hasUsableLinuxDirectoryHandler = Effect.fn("externalLauncher.hasUsableLinuxDirectoryHandler")(  function* (    env: NodeJS.ProcessEnv,  ): Effect.fn.Return<    boolean,    never,    FileSystem.FileSystem | Path.Path | ChildProcessSpawner.ChildProcessSpawner  > {    if (!(yield* isCommandAvailable("xdg-mime", { env }))) {      return false;    }     const spawner = yield* ChildProcessSpawner.ChildProcessSpawner;    return yield* spawner      .spawn(        ChildProcess.make("xdg-mime", ["query", "default", "inode/directory"], {          stdin: "ignore",          stderr: "ignore",        }),      )      .pipe(        Effect.flatMap((handle) =>          Effect.all([handle.stdout.pipe(Stream.decodeText(), Stream.mkString), handle.exitCode], {            concurrency: "unbounded",          }),        ),        Effect.map(([stdout, exitCode]) => exitCode === 0 && stdout.trim().length > 0),        Effect.scoped,        Effect.timeout(LINUX_DIRECTORY_HANDLER_PROBE_TIMEOUT),        Effect.orElseSucceed(() => false),      );  },); const isUsableFileManagerCommand = Effect.fn("externalLauncher.isUsableFileManagerCommand")(  function* (    command: string,    env: NodeJS.ProcessEnv,  ): Effect.fn.Return<    boolean,    never,    FileSystem.FileSystem | Path.Path | ChildProcessSpawner.ChildProcessSpawner  > {    if (!(yield* isCommandAvailable(command, { env }))) {      return false;    }    return command !== "xdg-open" || (yield* hasUsableLinuxDirectoryHandler(env));  },); // The file-manager command a launch can actually run, not just the platform// preference. WSL hosts prefer the Windows Explorer bridge, but interop can// exist without `explorer.exe` on PATH (appendWindowsPath=false) or without a// distro name while WSLg still provides a working Linux file manager, so they// keep the `xdg-open` fallback instead of losing the editor entirely.const resolveUsableFileManagerCommand = Effect.fn(  "externalLauncher.resolveUsableFileManagerCommand",)(function* (  platform: NodeJS.Platform,  env: NodeJS.ProcessEnv,): Effect.fn.Return<  string | undefined,  never,  FileSystem.FileSystem | Path.Path | ChildProcessSpawner.ChildProcessSpawner> {  const command = fileManagerCommandForPlatform(platform, env);  if (command !== undefined && (yield* isUsableFileManagerCommand(command, env))) {    return command;  }  if (    shouldUseWindowsHostFromWsl(platform, env) &&    hasGraphicalLinuxSession(env) &&    (yield* isUsableFileManagerCommand("xdg-open", env))  ) {    return "xdg-open";  }  return undefined;}); // Reveal on Windows and WSL runs through PowerShell (see// resolveFileManagerRevealLaunch), not the `explorer` command that gates the// file-manager editor itself, so the capability must probe the executables the// reveal actually spawns. Callers gate on file-manager availability first;// the Linux "files" kind relies on that gate for the directory-handler probe,// while the WSL fallback re-probes because its availability may have come// from the Explorer bridge instead.const fileManagerRevealKindForPlatform = Effect.fn(  "externalLauncher.fileManagerRevealKindForPlatform",)(function* (  platform: NodeJS.Platform,  env: NodeJS.ProcessEnv,): Effect.fn.Return<  FileManagerRevealKind | undefined,  never,  FileSystem.FileSystem | Path.Path | ChildProcessSpawner.ChildProcessSpawner> {  if (platform === "darwin") return "finder";  if (platform === "win32") {    return (yield* isCommandAvailable(resolvePowerShellPath(env), { env }))      ? "file-explorer"      : undefined;  }  if (shouldUseWindowsHostFromWsl(platform, env)) {    if (      env.WSL_DISTRO_NAME?.trim() &&      (yield* isCommandAvailable("explorer.exe", { env })) &&      (yield* isCommandAvailable(WSL_POWERSHELL_COMMAND, { env }))    ) {      return "file-explorer";    }    return hasGraphicalLinuxSession(env) && (yield* isUsableFileManagerCommand("xdg-open", env))      ? "files"      : undefined;  }  return hasGraphicalLinuxSession(env) ? "files" : undefined;}); function resolveWslFileManagerPath(target: string, distroName: string): string {  const relativePath = target.replace(/^\/+/, "").replaceAll("/", "\\");  return `\\\\wsl.localhost\\${distroName}${relativePath.length > 0 ? `\\${relativePath}` : ""}`;} function buildBrowserLaunch(  target: string,  platform: NodeJS.Platform,  env: NodeJS.ProcessEnv = {},): ProcessLaunch {  if (platform === "darwin") {    return {      command: "open",      args: [target],      options: DETACHED_IGNORE_STDIO_OPTIONS,    };  }   if (platform === "win32") {    return resolveWindowsBrowserLaunch(target, resolvePowerShellPath(env));  }   if (shouldUseWindowsHostFromWsl(platform, env)) {    return resolveWindowsBrowserLaunch(target, resolveWslPowerShellPath());  }   return {    command: "xdg-open",    args: [target],    options: DETACHED_IGNORE_STDIO_OPTIONS,  };} const buildAvailableEditors = Effect.fn("externalLauncher.buildAvailableEditors")(function* (  platform: NodeJS.Platform,  env: NodeJS.ProcessEnv,): Effect.fn.Return<  ReadonlyArray<EditorId>,  never,  FileSystem.FileSystem | Path.Path | ChildProcessSpawner.ChildProcessSpawner> {  const available: EditorId[] = [];   for (const editor of EDITORS) {    if (editor.commands === null) {      if ((yield* resolveUsableFileManagerCommand(platform, env)) !== undefined) {        available.push(editor.id);      }      continue;    }     const command = yield* resolveAvailableCommand(editor.commands, env);    if (Option.isSome(command)) {      available.push(editor.id);    }  }   return available;}); const resolveBrowserLaunch = Effect.fn("externalLauncher.resolveBrowserLaunch")(function* (  target: string,) {  const platform = yield* HostProcessPlatform;  const env = yield* readBrowserLaunchEnv;  return buildBrowserLaunch(target, platform, env);}); const resolveAvailableEditors = Effect.fn("externalLauncher.resolveAvailableEditors")(function* () {  const platform = yield* HostProcessPlatform;  const env = { ...(yield* readBrowserLaunchEnv), ...(yield* readCommandLookupEnv) };  return yield* buildAvailableEditors(platform, env);}); const resolveFileManagerRevealKind = Effect.fn("externalLauncher.resolveFileManagerRevealKind")(  function* () {    const platform = yield* HostProcessPlatform;    const env = { ...(yield* readBrowserLaunchEnv), ...(yield* readCommandLookupEnv) };    return yield* fileManagerRevealKindForPlatform(platform, env);  },); // Editor discovery walks PATH for every known editor and runs for every// client connect (the server config embeds the available editors). Memoize// the discovered set for a bounded window so repeat connects skip even the// per-command cache lookups in @t3tools/shared/shell.//// This deliberately does not use `Effect.cachedWithTTL`: that memoizes the// first caller's Exit whatever it is, including an interrupt. Callers run this// on the connection fiber under a timeout (`resolveAvailableEditorsForConfig`),// so one client disconnecting mid-scan would cache the interrupt and replay it// to every later connect for the whole TTL, breaking `server.getConfig`// permanently. Storing only on success means an interrupted scan leaves the// cache untouched and the next connect simply rescans.// Expiry uses the monotonic clock (Clock.currentTimeNanos), matching the// command-resolution cache in @t3tools/shared/shell, so a backward wall-clock// adjustment cannot keep an expired entry alive.const EDITOR_DISCOVERY_CACHE_TTL_NANOS = 60_000_000_000n; interface EditorDiscoveryCacheEntry {  readonly editors: ReadonlyArray<EditorId>;  readonly expiresAtNanos: bigint;} /** * ExternalLauncher - Service tag for browser/editor launch operations. */export class ExternalLauncher extends Context.Service<  ExternalLauncher,  {    readonly resolveAvailableEditors: () => Effect.Effect<ReadonlyArray<EditorId>>;    /**     * Reveal kind for the host, or undefined when the executable a reveal

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