Implement automated releases

.github/workflows/ci.yml

@@ -16,6 +16,8 @@ jobs:
     needs: ruby-versions
     name: ${{ matrix.os }} ${{ matrix.ruby }} ${{ matrix.env }}
     runs-on: ${{ matrix.os }}
+    env:
+      BUNDLE_WITHOUT: release
     strategy:
       fail-fast: false
       matrix:

.github/workflows/push_gem.yml

@@ -0,0 +1,85 @@
+name: Publish
+
+on:
+  workflow_run:
+    workflows: [CI]
+    types: [completed]
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    outputs:
+      run_publish: ${{ steps.precheck.outputs.run_publish }}
+
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.4"
+          bundler-cache: true
+
+      - id: precheck
+        name: Release precheck
+        run: bundle exec rake ci:check_release
+
+  push:
+    needs: check
+
+    if: |
+      needs.check.outputs.run_publish == 'true' &&
+      github.repository == 'ruby/json' &&
+      github.ref_name == github.event.repository.default_branch
+    runs-on: ubuntu-latest
+
+    environment:
+      name: rubygems.org
+      url: https://rubygems.org/gems/json
+
+    permissions:
+      contents: write
+      id-token: write
+
+    strategy:
+      matrix:
+        ruby: ["ruby", "jruby"]
+
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@ec9f2d5744a09debf3a187a3f4f675c53b671911 # v2.13.0
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@eaecf785f6a34567a6d97f686bbb7bccc1ac1e5c # v1.237.0
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+        # https://github.com/rubygems/rubygems/issues/5882
+      - name: Install dependencies and build for JRuby
+        run: |
+          sudo apt install default-jdk maven
+          gem update --system
+          gem install ruby-maven rake-compiler --no-document
+          rake compile
+        if: matrix.ruby == 'jruby'
+
+      - name: Install dependencies
+        run: bundle install --jobs 4 --retry 3
+
+      - name: Publish to RubyGems
+        uses: rubygems/release-gem@a25424ba2ba8b387abc8ef40807c2c85b96cbe32 # v1.1.1
+
+      - name: Create GitHub release
+        run: |
+          bundle exec rake ci:create_release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        if: matrix.ruby != 'jruby'

Gemfile

@@ -10,12 +10,17 @@ group :development do
   gem "test-unit"
   gem "test-unit-ruby-core"
   gem "all_images", "~> 0" unless RUBY_PLATFORM =~ /java/
+end
+
+group :release do
+  gem "net-http"
+  gem "uri"
+end
 
-  if ENV['BENCHMARK']
-    gem "benchmark-ips"
-    unless RUBY_PLATFORM =~ /java/
-      gem "oj"
-      gem "rapidjson"
-    end
+if ENV['BENCHMARK']
+  gem "benchmark-ips"
+  unless RUBY_PLATFORM =~ /java/
+    gem "oj"
+    gem "rapidjson"
   end
 end

Rakefile

@@ -12,6 +12,69 @@ PKG_VERSION       = File.foreach(File.join(__dir__, "lib/json/version.rb")) do |
   /^\s*VERSION\s*=\s*'(.*)'/ =~ line and break $1
 end rescue nil
 
+module CI
+  extend self
+
+  def gem_published?(name, version)
+    require 'net/https'
+    require 'uri'
+    uri = URI.parse("https://rubygems.org/api/v2/rubygems/#{name}/versions/#{version}.json")
+    Net::HTTP.get_response(uri).is_a?(Net::HTTPSuccess)
+  end
+
+  def changelog(version)
+    changelog_lines = File.readlines(File.expand_path("CHANGES.md", __dir__))
+    changelog_lines = changelog_lines.drop_while { |line| !(line.start_with?("### ") && line.include?("(#{version})")) }
+    if changelog_lines.empty?
+      return false
+    end
+    changelog_lines.shift
+    changelog_lines = changelog_lines.take_while { |line| !(line.start_with?("### ") ) }
+    changelog_lines.join
+  end
+
+  def prerelease?(version)
+    !version.match?(/\A[\d.]+\z/)
+  end
+end
+
+namespace :ci do
+  task :check_release do
+    unless PKG_VERSION
+      abort("Gem version couldn't be read")
+    end
+
+    if CI.gem_published?("json", PKG_VERSION)
+      $stderr.puts "Version #{PKG_VERSION} was already released. Nothing to do."
+      exit 0
+    end
+
+    if changelog = CI.changelog(PKG_VERSION)
+      puts "Changelog:"
+      puts changelog
+    else
+      abort("Could not find version #{PKG_VERSION} in CHANGES.md")
+    end
+
+    if ENV["GITHUB_OUTPUT"]
+      $stderr.puts "Triggering release"
+      File.open(ENV["GITHUB_OUTPUT"], "a+") do |f|
+        f.puts "run_publish=true"
+      end
+    end
+  end
+
+  task :create_release do
+    tag = "v#{PKG_VERSION}"
+    args = [
+      "--title", tag,
+      "--notes", changelog,
+    ]
+    args << "--prerelease" << "--latest=false" if CI.prerelease?(PKG_VERSION)
+    system("gh", "release", "create", tag, "--draft", *args)
+  end
+end
+
 JAVA_DIR            = "java/src/json/ext"
 JAVA_RAGEL_PATH     = "#{JAVA_DIR}/ParserConfig.rl"
 JAVA_PARSER_SRC     = "#{JAVA_DIR}/ParserConfig.java"