More release automation

Set annotated git tags with the related changelog entry.
Upload all release files as part of "rake release".

Author: larskanis

Rakefile

@@ -11,6 +11,7 @@ require 'rake/clean'
 require 'rspec/core/rake_task'
 require 'bundler'
 require 'bundler/gem_helper'
+require_relative "rakelib/pg_gem_helper"
 
 # Build directory constants
 BASEDIR = Pathname( __FILE__ ).dirname
@@ -34,7 +35,7 @@ CLEAN.include "lib/pg/postgresql_lib_path.rb"
 CLEAN.include "ports/*.installed"
 CLEAN.include "ports/*mingw*", "ports/*linux*", "ports/*darwin*"
 
-Bundler::GemHelper.install_tasks
+PgGemHelper.install_tasks
 $gem_spec = Bundler.load_gemspec(GEMSPEC)
 
 desc "Turn on warnings and debugging in the build."
@@ -56,6 +57,9 @@ CrossLibraries = [
 	CrossLibrary.new platform, openssl_config, toolchain
 end
 
+# Register binary gems to be pushed to rubygems.org
+Bundler::GemHelper.instance.cross_platforms = CrossLibraries.map(&:platform)
+
 # Rake-compiler task
 Rake::ExtensionTask.new do |ext|
 	ext.name           = 'pg_ext'

rakelib/pg_gem_helper.rb

@@ -0,0 +1,64 @@
+require 'bundler'
+require 'bundler/gem_helper'
+
+class PgGemHelper < Bundler::GemHelper
+  attr_accessor :cross_platforms
+
+  def install
+    super
+
+    task "release:guard_clean" => ["release:update_history"]
+
+    task "release:update_history" do
+      update_history
+    end
+
+    task "release:rubygem_push" => ["gem:native"]
+  end
+
+  def hfile
+    "CHANGELOG.md"
+  end
+
+  def headline
+    '([^\w]*)v(\d+\.\d+\.\d+(?:\.\w+)?)([^\w]+)([2Y][0Y][0-9Y][0-9Y]-[0-1M][0-9M]-[0-3D][0-9D])([^\w]*|$)'
+  end
+
+  def reldate
+    Time.now.strftime("%Y-%m-%d")
+  end
+
+  def update_history
+    hin = File.read(hfile)
+    hout = hin.sub(/#{headline}/) do
+      raise "#{hfile} isn't up-to-date for version #{version}" unless $2==version.to_s
+      $1 + $2 + $3 + reldate + $5
+    end
+    if hout != hin
+      Bundler.ui.confirm "Updating #{hfile} for release."
+      File.write(hfile, hout)
+      Rake::FileUtilsExt.sh "git", "commit", hfile, "-m", "Update release date in #{hfile}"
+    end
+  end
+
+  def tag_version
+    Bundler.ui.confirm "Tag release with annotation:"
+    m = File.read(hfile).match(/(?<annotation>#{headline}.*?)#{headline}/m) || raise("Unable to find release notes in #{hfile}")
+    Bundler.ui.info(m[:annotation].gsub(/^/, "    "))
+    IO.popen(["git", "tag", "--file=-", version_tag], "w") do |fd|
+      fd.write m[:annotation]
+    end
+    yield if block_given?
+  rescue
+    Bundler.ui.error "Untagging #{version_tag} due to error."
+    sh_with_code "git tag -d #{version_tag}"
+    raise
+  end
+
+  def rubygem_push(path)
+    cross_platforms.each do |ruby_platform|
+      super(path.gsub(/\.gem\z/, "-#{ruby_platform}.gem"))
+    end
+    super(path)
+  end
+end