/** * 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 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 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),}).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 `${env.SYSTEMROOT || env.windir || String.raw`C:\Windows`}\\System32\\WindowsPowerShell\\v1.0\\powershell.exe`;} function resolveWslPowerShellPath(): string {  return "/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe";} function shouldUseWindowsBrowserFromWsl(  platform: NodeJS.Platform,  env: NodeJS.ProcessEnv = {},): boolean {  return (    platform === "linux" &&    (env.WSL_DISTRO_NAME !== undefined || env.WSL_INTEROP !== undefined) &&    env.SSH_CONNECTION === undefined &&    env.SSH_TTY === undefined &&    env.container === undefined  );} function resolveWindowsBrowserLaunch(target: string, command: string): ProcessLaunch {  const encodedCommand = encodeUtf16LeBase64(    `$ProgressPreference = 'SilentlyContinue'; Start ${escapePowerShellStringLiteral(target)}`,  );  return {    command,    args: [...POWERSHELL_ARGUMENTS_PREFIX, encodedCommand],    options: {      detached: true,      shell: false,      stdin: "ignore",      stdout: "ignore",      stderr: "ignore",    },  };} function fileManagerCommandForPlatform(platform: NodeJS.Platform): string {  switch (platform) {    case "darwin":      return "open";    case "win32":      return "explorer";    default:      return "xdg-open";  }} 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 (shouldUseWindowsBrowserFromWsl(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> {  const available: EditorId[] = [];   for (const editor of EDITORS) {    if (editor.commands === null) {      const command = fileManagerCommandForPlatform(platform);      if (yield* isCommandAvailable(command, { env })) {        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* readCommandLookupEnv;  return yield* buildAvailableEditors(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>>;    /** Launch a URL target in the default browser. */    readonly launchBrowser: (target: string) => Effect.Effect<void, ExternalLauncherError>;    /**     * Launch a workspace path in a selected editor integration.     *     * Launches the editor as a detached process so server startup is not blocked.     */    readonly launchEditor: (input: LaunchEditorInput) => Effect.Effect<void, ExternalLauncherError>;  }>()("t3/process/externalLauncher") {} // ==============================// Implementations// ============================== const resolveEditorLaunch = Effect.fn("resolveEditorLaunch")(function* (  input: LaunchEditorInput,): Effect.fn.Return<EditorLaunch, ExternalLauncherError, FileSystem.FileSystem | Path.Path> {  const platform = yield* HostProcessPlatform;  const env = yield* readCommandLookupEnv;  yield* Effect.annotateCurrentSpan({    "externalLauncher.editor": input.editor,    "externalLauncher.cwd": input.cwd,    "externalLauncher.platform": platform,  });  const editorDef = EDITORS.find((editor) => editor.id === input.editor);  if (!editorDef) {    return yield* new ExternalLauncherUnknownEditorError({ editor: input.editor });  }   if (editorDef.commands) {    const command = Option.getOrElse(      yield* resolveAvailableCommand(editorDef.commands, env),      () => editorDef.commands[0],    );    return {      editor: editorDef.id,      target: input.cwd,      command,      args: resolveEditorArgs(editorDef, input.cwd),    };  }   if (editorDef.id !== "file-manager") {    return yield* new ExternalLauncherUnsupportedEditorError({ editor: input.editor });  }   return {    editor: editorDef.id,    target: input.cwd,    command: fileManagerCommandForPlatform(platform),    args: [input.cwd],  };}); const launchAndUnref = Effect.fn("externalLauncher.launchAndUnref")(function* (  launch: ProcessLaunch,  onError: (cause: unknown) => ExternalLauncherError,): Effect.fn.Return<void, ExternalLauncherError, ChildProcessSpawner.ChildProcessSpawner> {  const spawner = yield* ChildProcessSpawner.ChildProcessSpawner;  const command = ChildProcess.make(launch.command, launch.args, launch.options);   yield* spawner.spawn(command).pipe(    Effect.flatMap((handle) => handle.unref),    Effect.asVoid,    Effect.scoped,    Effect.mapError(onError),  );}); const launchBrowser = Effect.fn("externalLauncher.launchBrowser")(function* (  target: string,): Effect.fn.Return<void, ExternalLauncherError, ChildProcessSpawner.ChildProcessSpawner> {  const launch = yield* resolveBrowserLaunch(target);  return yield* launchAndUnref(    launch,    (cause) =>      new ExternalLauncherBrowserSpawnError({        target,        command: launch.command,        args: launch.args,        cause,      }),  );}); const launchEditorProcess = Effect.fn("externalLauncher.launchEditorProcess")(function* (  launch: EditorLaunch,): Effect.fn.Return<  void,  ExternalLauncherError,  ChildProcessSpawner.ChildProcessSpawner | FileSystem.FileSystem | Path.Path> {  const env = yield* readCommandLookupEnv;  if (!(yield* isCommandAvailable(launch.command, { env }))) {    return yield* new ExternalLauncherCommandNotFoundError({      editor: launch.editor,      command: launch.command,    });  }   const spawnCommand = yield* resolveSpawnCommand(launch.command, launch.args, { env });  yield* launchAndUnref(    {      command: spawnCommand.command,      args: spawnCommand.args,      options: {        detached: true,        shell: spawnCommand.shell,        stdin: "ignore",        stdout: "ignore",        stderr: "ignore",      },    },    (cause) =>      new ExternalLauncherEditorSpawnError({        editor: launch.editor,        target: launch.target,        command: spawnCommand.command,        args: spawnCommand.args,        cause,      }),  );}); export const make = Effect.gen(function* () {  const spawner = yield* ChildProcessSpawner.ChildProcessSpawner;  const fileSystem = yield* FileSystem.FileSystem;  const path = yield* Path.Path;   const provideCommandResolutionServices = <A, E, R>(    effect: Effect.Effect<A, E, R | FileSystem.FileSystem | Path.Path>,  ) =>    effect.pipe(      Effect.provideService(FileSystem.FileSystem, fileSystem),      Effect.provideService(Path.Path, path),    );   const editorDiscoveryCache = yield* Ref.make<Option.Option<EditorDiscoveryCacheEntry>>(    Option.none(),  );  const cachedAvailableEditors = Effect.gen(function* () {    const nowNanos = yield* Clock.currentTimeNanos;    const entry = yield* Ref.get(editorDiscoveryCache);    if (Option.isSome(entry) && entry.value.expiresAtNanos > nowNanos) {      return entry.value.editors;    }    const editors = yield* provideCommandResolutionServices(resolveAvailableEditors());    yield* Ref.set(      editorDiscoveryCache,      Option.some({        editors,        expiresAtNanos: nowNanos + EDITOR_DISCOVERY_CACHE_TTL_NANOS,      }),    );    return editors;  });   return ExternalLauncher.of({    resolveAvailableEditors: () => cachedAvailableEditors,    launchBrowser: (target) =>      launchBrowser(target).pipe(        Effect.provideService(ChildProcessSpawner.ChildProcessSpawner, spawner),      ),    launchEditor: (input) =>      provideCommandResolutionServices(        Effect.flatMap(resolveEditorLaunch(input), (launch) =>          launchEditorProcess(launch).pipe(            Effect.provideService(ChildProcessSpawner.ChildProcessSpawner, spawner),

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