Wrap versionning logic in its own class

This project "version" is special as it is based on the current date
plus a trailing number to allow multiple releases on the same day.

When cutting a new release, to determine version to use, we must check
if the previous release was cut on the same day.  If so, we only want to
bumy hte trailing number, otherwise, we want to set the date to the
current date and reset the trailing number to 1.

Author: smortex

tasks/vox.rake

@@ -1,17 +1,53 @@
-def current_version
-  @current_version ||= File.read(File.expand_path('../CHANGELOG.md', __dir__)).match(/^## \[([^\]]+)\]/) { |match| match[1] }
-rescue Errno::ENOENT
-  puts 'Cannot find current version from CHANGELOG.md.  Ignored'
-  @current_version = ''
-end
+class Version
+  attr_reader :date, :x, :raw
+
+  def initialize(v)
+    @raw = v
+
+    if (m = v.match(%r{\A(?<date>\d{4}-\d{2}-\d{2})-(?<x>\d+)\z}))
+      @date = m['date']
+      @x = m['x'].to_i
+    else
+      @date = nil
+      @x = 1
+    end
+  end
 
-def next_version
-  today_prefix = Time.now.utc.strftime('%Y-%m-%d')
+  def self.load_from_changelog
+    changelog = File.expand_path('../CHANGELOG.md', __dir__)
+    version = File.read(changelog).match(/^## \[([^\]]+)\]/) { |match| match[1] }
+    new(version)
+  rescue Errno::ENOENT
+    new('')
+  end
+
+  def to_s
+    if malformed?
+      raw
+    else
+      "#{date}-#{x}"
+    end
+  end
+
+  def next!
+    if date == today
+      @x += 1
+    else
+      @date = today
+      @x = 1
+    end
+
+    self
+  end
+
+  private
+
+  def malformed?
+    date.nil?
+  end
 
-  if current_version.start_with?(today_prefix)
-    current_version.next
-  else
-    "#{today_prefix}-1"
+  def today
+    Time.now.strftime('%Y-%m-%d')
   end
 end
 
@@ -22,12 +58,12 @@ end
 
 desc 'Get the current version of the project'
 task 'vox:version:current' do
-  puts current_version
+  puts Version.load_from_changelog
 end
 
 desc 'Get the next version of the project'
 task 'vox:version:next' do
-  puts next_version
+  puts Version.load_from_changelog.next!
 end
 
 begin
@@ -41,7 +77,7 @@ begin
     config.project = "puppet-runtime"
     config.exclude_labels = %w[dependencies duplicate question invalid wontfix wont-fix modulesync skip-changelog]
     config.since_tag = "202501080"
-    config.future_release = next_version
+    config.future_release = Version.load_from_changelog.next!.to_s
   end
 rescue LoadError
   task :changelog do