feat: bump version and generate CHANGELOG with the version

- add `no` option to bump task
- add `future_release` option to changelog task

Rakefile

@@ -8,37 +8,45 @@ task default: :spec
 
 desc "bump version and generate CHANGELOG with the version"
 task :bump, :type do |_, args|
+  require "bump"
   label = args[:type]
-  unless %w[major minor patch pre].include?(label)
-    raise "Usage: rake bump[LABEL] (LABEL: ['major', 'minor', 'patch', 'pre'])"
+  unless %w[major minor patch pre no].include?(label)
+    raise "Usage: rake bump[LABEL] (LABEL: ['major', 'minor', 'patch', 'pre', 'no'])"
   end
 
-  require "bump"
-  puts "Bump version to #{label}"
-  Bump::Bump.run(label)
-  puts 'Next step: "bundle exec rake release_tag"'
-end
-
-desc "Create and Push tag"
-task :release_tag do
-  require "bundler/gem_tasks"
-  Rake::Task["release:source_control_push"].invoke
-  puts 'Next step: "bundle exec rake generate_changelog"'
-end
+  next_version = if label == "no"
+    Bump::Bump.current
+  else
+    Bump::Bump.next_version(label)
+  end
 
-desc "Generate CHANGELOG.md"
-task :generate_changelog do
   require "github_changelog_generator/task"
-
   GitHubChangelogGenerator::RakeTask.new :changelog do |config|
     gemspec_path = Dir.glob(File.join(File.dirname(File.expand_path(__FILE__)), "*.gemspec")).first
     gemspec = Gem::Specification.load(gemspec_path)
     config.user = gemspec.authors.first
     config.project = gemspec.name
+    config.future_release = next_version
   end
 
   Rake::Task[:changelog].execute
 
   puts "update CHANGELOG"
-  `git add CHANGELOG.md && git commit -m "docs(CHANGELOG) update"`
+  `git add CHANGELOG.md`
+
+  if label == "no"
+    puts "No bump version"
+    `git commit -m "update CHANGELOG"`
+  else
+    puts "Bump version to #{label}"
+    Bump::Bump.run(label)
+  end
+
+  puts 'Next step: "bundle exec rake release_tag"'
+end
+
+desc "Create and Push tag"
+task :release_tag do
+  require "bundler/gem_tasks"
+  Rake::Task["release:source_control_push"].invoke
 end