Dangerfile

dangerfile.ts

import { danger, warn, fail, markdown, message } from "danger";
import jiraIssue from "danger-plugin-jira-issue";
import { readFileSync } from "fs";

/*
  Danger will post all these fail/warn/message's as a comment on the PR, from the jenkins user. Over time, as commits are added, the comment is amended.
  No comment means you're all good and the PR passes these checks.
  Check out http://danger.systems/js/ for how this all works, and http://danger.systems/js/guides/the_dangerfile.html for creating more rules.
*/

// ** Setup **
var updatedFiles = danger.git.created_files.concat(danger.git.modified_files)
var swiftFiles = updatedFiles.filter(path => stringContains(path, ".swift"))

class LintResult {
    character: number
    file: string
    line: number
    reason: string
    rule_id: string
    severity: string
    type: string

    constructor(object: any) {
        this.character = object["character"] as number
        this.file = object["file"] as string
        this.line = object["line"] as number
        this.reason = object["reason"] as string
        this.rule_id = object["rule_id"] as string
        this.severity = object["severity"] as string
        this.type = object["type"] as string
    }
}

// ** Rules **

// No PR is too small to include a description of why you made a change
if (danger.github.pr.body.length < 10) {
  warn('Please include a description of your PR changes.');
}

// Check that someone has been assigned to this PR
if (danger.github.requested_reviewers.users.length == 0) {
   warn('Please assign someone to review this PR.');
}

// Check that additions are less than 500 (with 50 line buffer)
const bigPRThreshold = 550;
if (danger.github.pr.additions >= bigPRThreshold) {
  warn(':exclamation: Big PR');
  markdown(`Please try to keep your PR size under ${bigPRThreshold} lines. If your PR contains multiple changes, consider splitting it into multiple PRs to help make reviews faster and easier.`);
}

// Congratulate PRs that simplify things
if (danger.github.pr.deletions > danger.github.pr.additions) {
  message('👏 Great job! This PR deletes more than it adds. Thanks for keeping us lean!');
}

// Checks for a JIRA issue in the title of the PR and links to it, eg: "ABC-101". Opt out by including "No Jira"
// yarn add danger-plugin-jira-issue --dev
if (!stringContainsAny(danger.github.pr.title.toLocaleLowerCase(), ["no jira", "nojira", "no-jira"])) {
  jiraIssue({
    key: ['ABC', 'abc'],
    url: 'https://abc.atlassian.net/browse',
    emoji: ':paperclip:',
    format(emoji, jiraUrls) { // Optional Formatter
      return `${emoji} ${jiraUrls.join(", ")} Check it out on JIRA`; 
    }
  })  
}

// Runs Swiftlint against added + modified files, and comments the results inline
var process = require('child_process');
swiftFiles.forEach(filePath => {
    var escapedFilePath = filePath.replace(" ", "\\ ");
    let output = process.execSync("Pods/SwiftLint/swiftlint --config Scripts/.swiftlint.yml --path " + escapedFilePath + " --reporter json")
    const jsonOutput = JSON.parse(output)
    jsonOutput.forEach((lint: any) => {
        const newLintResult = new LintResult(lint)
        let message = `${newLintResult.type}: ${newLintResult.reason}`
        let fileComponents = newLintResult.file.split(`jenkins-job-name/`)
        var file: string = fileComponents[0]
        if (fileComponents.length >= 2) {
            file = fileComponents[1]
        }
        let line = newLintResult.line
        if (newLintResult.severity.toLowerCase() === "error") {
            fail(message, file, line)
        } else {
            warn(message, file, line)
        }
    });
})

swiftFiles.forEach(filePath => {
  var fileText = readFileSync(filePath, 'utf8');
  if (stringContains(fileText, "UINavigationController(rootViewController:")) {
    warn(`${fileNameFrom(filePath)} is using a default UINavigationController. Please use ABCNavigationController instead.`);
  }

  if (stringContains(filePath, "ViewController.swift") && !stringContains(fileText, "supportedInterfaceOrientations")) {
    warn(`${fileNameFrom(filePath)} is not defining its supportedInterfaceOrientations. Please do so to ensure orientation is properly handled.`);
  }
})

// ** Helpers **

function fileNameFrom(filePath: string) {
  return filePath.replace(/^.*(\\|\/|\:)/, '');
}

function stringContains(first: string, second: string) {
  return first.indexOf(second) !== -1
}

function stringContainsAny(first: string, any: string[]) {
  let contains = any.find( tester =>
    stringContains(first, tester)
  )
  return contains !== undefined
}

Hey @mikenikles, thanks! I really like danger's ability to do positive feedback too. I took a look and your dangerfile looks great! I'm inspired by your wording and think I'll try to make ours a bit friendlier.

Good tip on the requested_reviewers, I took a look! I'm seeing that it's defined as requested_reviewers: GitHubUser[] so it looks like an array and the length check is working, from https://github.com/danger/danger-js/blob/3c641236595774c1e4202fad43217432fe9c780b/source/dsl/GitHubDSL.ts#L18.