gistfile1.txt

https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/actors/DocumentationActor.scala#L135
DocumentationSummary の translations に言語別最新バージョンが格納されてる。

https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/actors/DocumentationActor.scala#L259-L261
documentation.translations.mapValues(_.defaultVersion) が translations として渡されている。
documentation は
https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/actors/DocumentationActor.scala#L188
var documentation: Documentation = null

documentation は UpdateDocumentation メッセージで更新される
https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/actors/DocumentationActor.scala#L196-L197

UpdateDocumentation を送っているのはここ。
https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/actors/DocumentationPollingActor.scala#L102

Documentation の組み立てはここ。
https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/actors/DocumentationPollingActor.scala#L86-L100

Translation(versions, t.repo, t.config.gitHubSource)

https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/models/documentation/Documentation.scala#L56-L61
defaultVersion は

  /**
   * The default version to render
   */
  lazy val defaultVersion: Option[Version] = {
    // Find the most recent stable version, and then the latest version that matches that
    displayVersions.find(_.versionType.isStable).flatMap { stable =>
      displayVersions.find(v => v.sameMajor(stable) && (v.versionType.isLatest || v.versionType.isStable))
    }.orElse(displayVersions.headOption)
  }

isStable が真の version を displayVersion から探して、メージャーバージョンが同じ、かつ isLatest で isStable なもの。
なければ displayVersions の先頭。


https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/actors/DocumentationPollingActor.scala#L95
versions の読み取りはここ。

git の tag や branch 名からの Version parse は Version.parse()
https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/actors/DocumentationPollingActor.scala#L105-L109

version の parse
https://github.com/playframework/playframework.com/blob/f8d7840e754ead829c7a6b6006e24b91c428faad/app/models/documentation/Documentation.scala#L114-L166