JamieMason/syncpack

import type { CosmiconfigResult } from 'cosmiconfig';
import { Effect, Option, pipe } from 'effect';
import { join } from 'path';
import { isNonEmptyObject } from 'tightrope/guard/is-non-empty-object.js';
import type { O } from 'ts-toolbelt';
import type { RcConfig } from '../config/types.js';
import type { PackageJson } from '../get-package-json-files/package-json-file.js';
import type { Io } from './index.js';
import { readJsonFileSync } from './read-json-file-sync.js';

const getOptionOfNonEmptyObject = Option.liftPredicate(isNonEmptyObject<any>);

type UnverifiedRcConfig = O.Partial<RcConfig, 'deep'>;

export function readConfigFile(io: Io, configPath?: string): Effect.Effect<UnverifiedRcConfig> {
  return pipe(
    Effect.try(() => io.cosmiconfig.cosmiconfig('syncpack')),
    Effect.flatMap((client) =>
      Effect.tryPromise(() => (configPath ? client.load(configPath) : client.search())),
    ),
    Effect.flatMap((result) =>
      result !== null ? getValueFromCosmiconfig(result) : findConfigInPackageJson(io),
    ),
    Effect.tap((config) => Effect.logDebug(`config file found: ${JSON.stringify(config)}`)),
    Effect.tapError(() => Effect.logDebug('no config file found, will use defaults')),
    Effect.catchAll(() => Effect.succeed({})),
  );
}

/**
 * Look for a .config.syncpack property in the root package.json.
 * @see https://github.com/JamieMason/syncpack/issues/86
 */
function findConfigInPackageJson(io: Io): Effect.Effect<UnverifiedRcConfig, unknown> {
  return pipe(
    Effect.Do,
    Effect.bind('rcPath', () => Effect.succeed(join(io.process.cwd(), 'package.json'))),
    Effect.bind('packageJson', ({ rcPath }) => readJsonFileSync<PackageJson>(io, rcPath)),
    Effect.bind('config', ({ packageJson }) =>
      Effect.try(() => packageJson.contents?.config?.syncpack),
    ),
    Effect.flatMap(({ config }) => getOptionOfNonEmptyObject(config)),
    Effect.tapBoth({
      onSuccess: () => Effect.logDebug('config found in <package.json>.config.syncpack'),
      onFailure: () => Effect.logDebug('config not found in <package.json>.config.syncpack'),
    }),
  );
}

/** Extract the value from a successful search by cosmiconfig */
function getValueFromCosmiconfig(
  result: Exclude<CosmiconfigResult, null>,
): Effect.Effect<UnverifiedRcConfig, unknown> {
  return pipe(
    Effect.succeed(result),
    Effect.tap((result) => Effect.logDebug(`cosmiconfig found ${result.filepath}`)),
    Effect.flatMap((result) => getOptionOfNonEmptyObject(result.config)),
  );
}