Added bump target

Author: nobu

Rakefile

@@ -1,6 +1,8 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
 
+helper = Bundler::GemHelper.instance
+
 Rake::TestTask.new(:test) do |t|
   t.test_files = FileList["test/**/test_*.rb"]
 end
@@ -12,3 +14,41 @@ task "build" => "date_epoch"
 task "date_epoch" do
   ENV["SOURCE_DATE_EPOCH"] = IO.popen(%W[git -C #{__dir__} log -1 --format=%ct], &:read).chomp
 end
+
+def helper.update_gemspec
+  path = "#{__dir__}/#{gemspec.name}.gemspec"
+  File.open(path, "r+b") do |f|
+    if (d = f.read).sub!(/^(version\s*=\s*)".*"/) {$1 + gemspec.version.to_s.dump}
+      f.rewind
+      f.truncate(0)
+      f.print(d)
+    end
+  end
+end
+
+def helper.commit_bump
+  sh(%W[git -C #{__dir__} commit -m bump\ up\ to\ #{gemspec.version}
+        #{gemspec.name}.gemspec])
+end
+
+def helper.version=(v)
+  gemspec.version = v
+  update_gemspec
+  commit_bump
+  tag_version
+end
+major, minor, teeny = helper.gemspec.version.segments
+
+task "bump:teeny" do
+  helper.version = Gem::Version.new("#{major}.#{minor}.#{teeny+1}")
+end
+
+task "bump:minor" do
+  raise "can't bump up minor"
+end
+
+task "bump:major" do
+  raise "can't bump up major"
+end
+
+task "bump" => "bump:teeny"