Experimental CocoaPodsBot

CocoaPodsBot.rb

#!/usr/bin/env ruby

# Experimental CocoaPodsBot
#
# Synopsis:
#
#   The CocoaPodsBot performs a full lint (including xcodebuild) and prints a
#   markdown message with the result of the lint.
#
# Usage:
#
#   $ ruby CocoaPodsBot.rb [LOGIN PASSWORD] PULL_REQUEST_NUMBER
#
#     - LOGIN                 A GitHub account belonging to the CocoaPods
#                             organization. If not provided the value of the
#                             GITHUB_USER environment variable is used.
#
#     - PASSWORD              The password of the account. If not provided the
#                             value of the GITHUB_USER environment variable is
#                             used.
#
#     - PULL_REQUEST_NUMBER   The number of the pull request to lint.
#
# Requirements:
#
#   - CocoaPods
#   - Xcode command line tools
#   - OS X
#
# Todo:
#
#   - Use the GitHub API to comment on behalf of the user on the pull request.
#     Alternatively a CocoaPodsBot account could be created for this purpose.
#
#   - Support for pulls with multiple podspecs that depend from each other.
#

require 'rubygems'
require 'open-uri'
require 'cocoapods'
require 'octokit'

Specification = Pod::Specification
TMP_DIR = Pathname.new('/tmp/CocoaPods/CocoaPodsBot')

class CocoaPodsBot

  def initialize(arguments)
    if arguments.count == 3
      login, password, pull_number = *arguments
    else
      login, password = ENV['GITHUB_USER'], ENV['GITHUB_PASSWORD']
      pull_number = arguments.first
    end

    @client = Octokit::Client.new(:login => login, :password => password)
    @pull_number = pull_number
  end

  def pull_request
    @pull_request ||= @client.pull_request('CocoaPods/Specs', @pull_number)
  end

  def team_members
    # 108950 is the id of the Specs team
    @team_members ||= @client.team_members('108950')
  end

  def pull_request_files
    @client.get("https://api.github.com/repos/cocoapods/specs/pulls/#{@pull_number}/files")
  end

  def local_path(file)
    TMP_DIR + File.basename(file.raw_url)
  end

  def download_podspec(file)
    path = local_path(file)
    path.dirname.mkpath
    open(file.raw_url) do |io|
      path.open('w') { |f| f << io.read }
    end
  end

  def path_message(file)
    spec = Specification.from_file(local_path(file))
    expected_filename = "#{spec.name}/#{spec.version}/#{spec.name}.podspec"
    file.filename == expected_filename ? nil : "\nIncorrect Path: `#{file.filename}` should be `#{expected_filename}`.\n"
  end

  def lint_message(file)
    output = `pod spec lint --no-color #{local_path(file)}`
    $?.to_i.zero? ? nil : output
  end

  # @TODO: The best solution would be to merge the master repo and
  # and then lint the pods so new dependencies are available checked.
  #
  def run
    puts
    puts "Processing Pull Request ##{@pull_number} by #{pull_request.user.login}"
    puts

    path_messages = []
    lint_messages = []
    pull_request_files.each do |file|
      filename = file.filename
      url = file.raw_url
      puts "- #{filename}"
      download_podspec(file)
      path_messages << path_message(file)
      lint_messages << lint_message(file)
    end
    puts

    if lint_messages.compact.empty? && path_messages.compact.empty?
      comment =  "The CocoaPodsBot approves this pull request."

      unless team_members.any? { |user| user.id == pull_request.user.id }
        comment << " @#{pull_request.user.login} Would you like push access?"
      end
    else
      comment = ":exclamation: The CocoaPodsBot has some concerns regarding this pull request.\n"
      comment << path_messages.join("\n - ")
      comment << "\n\n```"
      comment << lint_messages.join("\n")
      comment << "\n```"
    end
    puts comment
    puts
  end
end

bot = CocoaPodsBot.new(ARGV)
bot.run