Easier releases with git and git flow

gistfile1.txt

# Create a file in config/initializers/version.rb, with the following string in it
# APP_VERSION = "0.0.0"
#
# Add this file to lib/tasks
#
# Add the following to ~/.bash_profile
# function release() {
# version=`bundle exec rake version:next`
# git flow release start $version && bundle exec rake version:bump && git commit -a -m "version bump" && git flow release finish $version && git push origin master
# }
#
# Now when you are on "develop" and are ready to prep a release, just do:
# release

namespace :version do

  EXAMPLE_VERSION = "0.0.1"

  desc "Get the current version"
  task :current do
    puts version_to_str(read_version)
  end

  desc "Get the next release version"
  task :next do
    puts version_to_str(next_release)
  end

  desc "Bumps the release (as in Major.Minor.Release)"
  task :bump do
      version = next_release
      write_version(version)

      puts "The new version is #{version_to_str(version)}"
      puts "Written to #{version_filename}"
  end

  def version_filename
    result = File.expand_path(File.join(File.dirname(__FILE__), '../../config/initializers/version.rb'))
    raise "Could not find version file: was looking for #{result}" if !File.exists?(result)
    result
  end

  def read_version
    file_str = IO::read(version_filename)

    if file_str=~/APP_VERSION\s*=\s*"([^"]*)"/
      version_str = $1

      versions = version_str.split('.')
      major = 0
      minor = 0
      release = 0
      major = versions[0].to_i if versions.count>=1
      minor = versions[1].to_i if versions.count>=2
      release = versions[2].to_i if versions.count>=3
    else
      raise "No version information in file #{version_filename}. Add something like this to the file:\n#{EXAMPLE_VERSION}"
    end
    { :major => major, :minor => minor, :release => release }
  end

  def write_version(version={})
    file_str = IO::read(version_filename)

    if file_str=~/APP_VERSION\s*=\s*"([^"]*)"/
      new_file_str = file_str.gsub(/APP_VERSION\s*=\s*"([^"]*)"/, "APP_VERSION = \"#{version[:major]}.#{version[:minor]}.#{version[:release]}\"")
    else
      new_file_str = "#{file_str}\nAPP_VERSION = \"#{version[:major]}.#{version[:minor]}.#{version[:release]}\""
    end
    open(version_filename, 'w') { |f| f.puts new_file_str }
  end

  def next_release
    version = read_version
    version[:release] += 1
    version
  end

  def version_to_str(version)
    "#{version[:major]}.#{version[:minor]}.#{version[:release]}"
  end
end