releasenotes.rb

#!/usr/bin/env ruby
require 'optparse'

PREFIX = "DATA"

# Returns Hash of [ticketNumber => [commit1, commit2, ...]]
def getDiff(tag1, tag2, timestamps, unique)
  format = timestamps ? "%ci %s" : "%s"
  uniqpipe = unique ? "| uniq " + (timestamps ? "-s 25" : "") : ""
  return Hash[`git log --pretty="#{format}" #{tag1}...#{tag2} #{uniqpipe}`
    .split("\n")
    .map { |msg|
      ticket = msg.match(/DATA-(\d+)/)
      if ticket != nil
        if msg.match(/Merge (branch|pull request) .* (into|from)/) == nil
          # Not a merge commit, so include it
          submatch = msg.match(/\[?(#{PREFIX}-\d+)\]?[\-|_| ]?(.*)/)
          if submatch != nil
            if submatch.captures[1].length > 0
              [submatch.captures[0], submatch.captures[1]]
            end
          else
            [ticket[0], msg]
          end
        end
      end
    }
    .reject { |e| e == nil }
    .group_by(&:first)
    .map { |k, a|
      [k, a.map(&:last).uniq]
    }]
end

def printDiff(diff)
  diff.each { |ticket, notes|
    print('- ' + ticket + ":\n")

    notes.each { |n| print("  - " + n + "\n") }
    print("\n\n")
  }
end

def getOptions(args)
  options = {:timestamps => false, :unique => false}
  OptionParser.new do |opts|
    opts.banner = "Usage: releasenotes <tag1> <tag2>"

    opts.on("-t", "--timestamps", "Include timestamps") do |t|
      options[:timestamps] = t
    end

    opts.on("-u", "--unique", "Unique commit messages") do |t|
      options[:unique] = t
    end

    opts.on_tail("-h", "--help", "Show this message") do
        puts opts
        exit
      end
  end.parse!(args)

  return options
end

opts = getOptions(ARGV)

if ARGV.length < 2
  # puts "Usage: releasenotes <tag1> <tag2> [options] (run --help for more info on options)"
  # Loop tags
  tags = `git tag`.split("\n")
  (tags.length - 1).times do |i|
    tag1 = tags[i]
    tag2 = tags[i + 1]
    puts '##' + tag1 + ":\n\n"
    printDiff(getDiff(tag1, tag2, opts[:timestamps], opts[:unique]))
  end
else
  printDiff(getDiff(ARGV[0], ARGV[1], opts[:timestamps], opts[:unique]))
end