git-extras release script

release_info.rb

#!/usr/bin/env ruby
# encoding: UTF-8
require 'set'

# usage: $SCRIPT <dir_of_git_extras>
Dir.chdir ARGV[0]
puts <<EOS
The git-extras $version ($release-name) is released now!

Here's a list of all the changes made in this release; the full changelog can be found in [History.md](https://github.com/tj/git-extras/blob/master/History.md):

EOS

contributor = ''
num = 0
displayed = false
latest_tag=`git describe --tags $(git rev-list --tags --max-count=1)`.chop
`git log --pretty="%B" #{latest_tag}.. --merges`.lines.each_with_index do |line, idx|
  line.strip!
  matches = /^Merge pull request (.+) from ([^\/]+)\//.match(line)
  if matches
    num = matches[1]
    contributor = matches[2]
    displayed = false
  elsif line != "" and !displayed
    puts "- (#{num}) #{line} – @#{contributor}"
    displayed = true
  end
end

authors = Set.new
in_contributor_section = false
File.read('AUTHORS').each_line do |line|
  if line == "```````````````````````\n"
    in_contributor_section = true
  end

  if line.start_with? "- "
    if in_contributor_section
      authors.add line[2..-1]
    else
      name = /^- (.+) </.match(line)[1]
      authors.add name
    end
  end
end

authors.add '罗泽轩' # I don't want to be counted twice

new_authors = Set.new
`git log --pretty="%an" --no-merges #{latest_tag}..`.each_line do |line|
  line.strip!
  unless authors.include? line
    new_authors.add "- #{line}"
    authors.add line
  end
end

doc_updated = `git log --oneline #{latest_tag}.. -- man/`.lines.length
install_updated = `git log --oneline #{latest_tag}.. -- \[iI\]nstall*`.lines.length
puts <<EOS

Since the last release (#{latest_tag} $last-release-name):

- updated man pages or documentation **#{doc_updated} times**
- fixed installation/update **#{install_updated} times**
- **#{new_authors.length} unique contributors**

**Break change**:
EOS

puts "\nNew authors:"
new_authors.each do |author|
  puts author
end