gh releaser

gh_release.rb

require 'octokit'
require 'pry'
require 'active_support'
require 'active_support/core_ext'

token = ENV['GH_TOKEN'] # create via https://github.com/settings/tokens
repos = 'nnh/oscr-ptosh'
matchers = [/Merge pull request \#(\d+) from/, /\(\#(\d+)\)/]

client = Octokit::Client.new(access_token: token)

# fetch commits from latest release tag
latest_release = client.releases(repos).first.tag_name
changes = client.compare(repos, latest_release, 'master').commits

# list PR-ish commits
list = changes.each_with_object({}) do |commit, r|
  msg = commit.commit.message.split(/\n/).first
  matchers.each do |m|
    if m =~ msg
      r[$1] = {sha: commit.sha, date: commit.commit.author.date}
      break
    end
  end
end

# attach PR title
list.each do |num, val|
  pr = client.pull_request(repos, num)
  if pr.merge_commit_sha == val[:sha]
    val.update(title: pr.title)
  end
end

# make release note
note = list.each_with_object("") do |(k, v), r|
  r << " - ##{k} #{v[:title].gsub(/\[\#(\d+)\]/){ "([##{$1}](https://www.pivotaltracker.com/story/show/#{$1}))" }}\n"
end

# make draft release
opt = {target_commitish: :release,
  name: "#{Date.current.strftime('%Y%m%d')} release",
  body: note,
  draft: true}
client.create_release(repos, Date.current.strftime('%Y%m%d'), opt)