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import { sprintf } from "../deps.ts";import { IFile } from "./file.ts";
/** * A FileBag holds and manages implementations of IFile */export class FileBag extends Set<IFile> {  private static create(items: IFile[]): FileBag {    const fileBag = new FileBag();    if (items) {      for (const item of items) {        fileBag.add(item);      }    }    return fileBag;  }
  get(path: string): Promise<IFile> {    const source = this.find((source) =>      source.relativePath() === path || source.relativeAlias() === path    );    if (source) {      return Promise.resolve(source);    } else {      return Promise.reject(        new Error(sprintf("source does not exist at %s", path)),      );    }  }
  /**   * Merge this FileBag with another   * @param other   * @returns A new FileBag with the merged result   */  merge(other: FileBag) {    const sources = new FileBag();
    for (const source of this.values()) {      sources.add(source);    }
    for (const source of other.values()) {      sources.add(source);    }
    return sources;  }
  find(predicate: (file: IFile) => boolean) {    for (const source of this.values()) {      if (predicate(source)) {        return source;      }    }  }
  filter(predicate: (file: IFile) => boolean) {    const items: IFile[] = [];    for (const source of this.values()) {      if (predicate(source)) {        items.push(source);      }    }
    return FileBag.create(items);  }
  toArray() {    return Array.from(this.values());  }}