seek.rb

#!/usr/bin/env ruby

# Parse changelogs per branch
changelogs = {}
# Start at 1.2 because we don't have 1.1.0 in the new format. NBD, 1.1 is old
# as shit anyway.
releases = 2.upto(7).map {|x| "1.#{x}"}
target = /\* :(?<type>feature|bug|support|release):`((?<issue_no>\d+)|(?<release_no>\S+) <[^>]+>)`/
releases.each do |x|
  changelogs[x] = `git show origin/#{x}:docs/changelog.rst`.split(/\n/).map do |line|
    target.match(line)
  end.compact
end

# Helper
def previous_number(number)
  parts = number.split('.')
  [parts[0], parts[1].to_i.pred.to_s].join('.')
end

# Capture for deduping & printing
backports = []
major_bugs = []

# Discover backports/major bugs
changelogs.each do |number, items|
  release_i = items.find_index {|x| x[:release_no] == "#{number}.0"}
  # Feature or Support items released in bugfix releases: 'backported'
  # * Found in a branch's copy of the changelog, higher up than that branch's .0
  # release
  items[0..release_i].each do |item|
    if !backports.include?(item) && %w(feature support).include?(item[:type])
      backports << item
    end
  end
  # Bugs released in feature releases: 'major'
  # * Found in a branch's changelog in a .0 release, is type 'bug'
  # * a .0 release for a branch is defined as items found in that branch prior
  # to the .0 release _line_, and not found in the previous branch.
  items[release_i..-1].each do |item|
    is_candidate = !major_bugs.include?(item) && item[:type] == 'bug'
    only_here = !changelogs.fetch(previous_number(number), []).include?(item)
    major_bugs << item if is_candidate && only_here
  end
end

# Print
backports.each do |item|
  puts "[backported] #{item[:type]} #{item[:issue_no]}"
end
major_bugs.each do |item|
  puts "[major] #{item[:type]} #{item[:issue_no]}"
end