Function resolveEngine

packages/internals/src/engine-commands/getEnginesInfo.ts:72–112

(binaryName: BinaryType)

}

export async function resolveEngine(binaryName: BinaryType): Promise<EngineInfo> {
  const pathFromEnvOption = O.fromNullable(getBinaryEnvVarPath(binaryName))

  /**
   * Read the binary path, preferably from the environment, or resolving the canonical path
   * from the given `binaryName`.
   */

  const fromEnvVarOption: O.Option<string> = pipe(
    pathFromEnvOption,
    O.map((p) => p.fromEnvVar),
  )

  const enginePathEither: E.Either<Error, string> = await pipe(
    pathFromEnvOption,
    O.fold(
      () => safeResolveBinary(binaryName),
      (pathFromEnv) => TE.right(pathFromEnv.path),
    ),
  )()

  /**
   * Read the version from the engine, but only if the enginePath is valid.
   */

  const versionEither: E.Either<Error, string> = await pipe(
    enginePathEither,
    TE.fromEither,
    TE.chain((enginePath) => {
      return safeGetEngineVersion(enginePath, binaryName)
    }),
  )()

  const engineInfo: EngineInfo = {
    path: enginePathEither,
    version: versionEither,
    fromEnvVar: fromEnvVarOption,
  }

  return engineInfo
}