GitHubGit.ts

import { GitDSL, GitJSONDSL } from "../../dsl/GitDSL"
import { GitHubCommit, GitHubDSL } from "../../dsl/GitHubDSL"
import { GitCommit } from "../../dsl/Commit"

import { GitHubAPI } from "../github/GitHubAPI"

import { diffToGitJSONDSL } from "../git/diffToGitJSONDSL"
import { GitJSONToGitDSLConfig, gitJSONToGitDSL } from "../git/gitJSONToGitDSL"

import { debug } from "../../debug"
const d = debug("GitHubGit")

/**
 * Returns the response for the new comment
 *
 * @param {GitHubCommit} ghCommit A GitHub based commit
 * @returns {GitCommit} a Git commit representation without GH metadata
 */
function githubCommitToGitCommit(ghCommit: GitHubCommit): GitCommit {
  return {
    sha: ghCommit.sha,
    parents: ghCommit.parents.map(p => p.sha),
    author: ghCommit.commit.author,
    committer: ghCommit.commit.committer,
    message: ghCommit.commit.message,
    tree: ghCommit.commit.tree,
    url: ghCommit.url,
  }
}

export default async function gitDSLForGitHub(api: GitHubAPI): Promise<GitJSONDSL> {
  // We'll need all this info to be able to generate a working GitDSL object
  const diff = await api.getPullRequestDiff()
  const getCommits = await api.getPullRequestCommits()
  const commits = getCommits.map(githubCommitToGitCommit)
  return diffToGitJSONDSL(diff, commits)
}

export const gitHubGitDSL = (github: GitHubDSL, json: GitJSONDSL, githubAPI?: GitHubAPI, ghToken?: string): GitDSL => {
  // TODO: Remove the GitHubAPI
  // This is blocked by https://github.com/octokit/node-github/issues/602

  const ghAPI =
    githubAPI ||
    new GitHubAPI({ repoSlug: github.pr.base.repo.full_name, pullRequestID: String(github.pr.number) }, ghToken)

  if (!githubAPI) {
    d("Got no GH API, had to make it")
  }

  const config: GitJSONToGitDSLConfig = {
    repo: github.pr.head.repo.full_name,
    baseSHA: github.pr.base.sha,
    headSHA: github.pr.head.sha,
    getFileContents: github.utils.fileContents,
    getFullDiff: ghAPI.getPullRequestDiff,
  }

  d("Setting up git DSL with: ", config)
  return gitJSONToGitDSL(json, config)
}

export const emptyGitJSON = (): GitJSONDSL => ({
  commits: [],
  created_files: [],
  deleted_files: [],
  modified_files: [],
})