fs.ts

import Bluebird from "bluebird";
import fs from "fs";
import fse from "fs-extra";
import path from "path";

/**
 * resolve
 *
 * transform a path relative to absolute, if relative
 * path start with `graphdoc/` return absolute path to
 * plugins directory
 */
const MODULE_BASE_PATH = "graphdoc/";

export function resolve(relative: string): string {
  if (relative.slice(0, MODULE_BASE_PATH.length) === MODULE_BASE_PATH) {
    return path.resolve(
      __dirname,
      "../../",
      relative.slice(MODULE_BASE_PATH.length)
    );
  }

  return path.resolve(relative);
}

/**
 * Execute fs.read as Promise
 */
export const readFile = Bluebird.promisify<string, string, string>(fs.readFile);
export const writeFile = Bluebird.promisify<undefined, string, any>(
  (file: string, data: any, cb: (err: Error, result?: undefined) => void) =>
    fs.writeFile(file, data, cb)
);
export const copyAll = Bluebird.promisify<undefined, string, string>(
  (from: string, to: string, cb: (err: Error, result?: undefined) => void) =>
    fse.copy(from, to, cb)
);
export const readDir = Bluebird.promisify<string[], string>(fs.readdir);
export const mkDir = Bluebird.promisify<string, string>(fs.mkdir as any);
export const removeBuildDirectory = Bluebird.promisify<void, string>(
  fse.remove as any
);

/**
 * Create build directory from a template directory
 */
export async function createBuildDirectory(
  buildDirectory: string,
  templateDirectory: string,
  assets: string[]
) {
  // read directory
  const files = await readDir(templateDirectory);
  await Bluebird.all(
    files

      // ignore *.mustache templates
      .filter((file) => path.extname(file) !== ".mustache")

      // copy recursive
      .map((file) =>
        copyAll(
          path.resolve(templateDirectory, file),
          path.resolve(buildDirectory, file)
        )
      )
  );

  // create assets directory
  await mkDir(path.resolve(buildDirectory, "assets"));

  await Bluebird.all(
    assets.map((asset) =>
      copyAll(
        asset,
        path.resolve(buildDirectory, "assets", path.basename(asset))
      )
    )
  );
}