version-bumping.rake

namespace "version" do
  path = 'lib/gem-name/version.rb'
  content = File.read(path)
  regex = /(VERSION\s*=\s*['"])([0-9.]+)(['"])/
  match = content.match(regex)
  version = match[2]
  vparts = version.split('.')
  major = vparts[0] ? Integer(vparts[0]) : 0
  minor = vparts[1] ? Integer(vparts[1]) : 0
  patch = vparts[2] ? Integer(vparts[2]) : 0

  def git_commit (version, path)
    @target = false
    @Gemfile = false
    if !`git status --porcelain #{path}`.match(/^[?]{2}/)
      @target = true
    end
    if !`git status --porcelain Gemfile.lock`.match(/^[?]{2}/)
      @Gemfile = true
    end
    `git commit -m '#{version}' -o #{@target ? path : ""} #{@Gemfile ? "Gemfile.lock" : ""}`
    `git tag -a 'v#{version}' -m '#{version}'`
  end

  task :major do
    new_version = "#{major + 1}.0.0"
    File.write(path, content.sub(regex, "\\1#{new_version}\\3"))
    git_commit(new_version, path)
    puts "Version bumped from #{version} to #{new_version}"
  end

  task :minor do
    new_version = "#{major}.#{minor + 1}.0"
    File.write(path, content.sub(regex, "\\1#{new_version}\\3"))
    git_commit(new_version, path)
    puts "Version bumped from #{version} to #{new_version}"
  end

  task :patch do
    new_version = "#{major}.#{minor}.#{patch + 1}"
    File.write(path, content.sub(regex, "\\1#{new_version}\\3"))
    git_commit(new_version, path)
    puts "Version bumped from #{version} to #{new_version}"
  end
end