Populate github owner/repo keys with default values from git remote

docs/docs/docs/build-the-microsite.md

@@ -54,7 +54,7 @@ From version [`0.5.4`](https://github.com/47deg/sbt-microsites/releases/tag/v0.5
 Before publishing, a couple of requirements should be satisfied:
 
 1. Initialize the **gh-pages** branch, you can follow the instructions defined in the [sbt-ghpages](https://github.com/sbt/sbt-ghpages/blob/master/README.md#initializing-the-gh-pages-branch) repository.
-2. Define `micrositeGithubOwner` and `micrositeGithubRepo` settings and maybe the `micrositePushSiteWith` and `micrositeGithubRepo` settings.
+2. Define `micrositeGithubOwner` and `micrositeGithubRepo` settings (if they can't be infered from git remotes) and maybe the `micrositePushSiteWith` and `micrositeGithubRepo` settings.
 You can see more details regarding this in the [Configuring the Microsite]({% link docs/settings.md %}) section.
 
 Once both requirements are satisfied, you can just run:

docs/docs/docs/settings.md

@@ -95,7 +95,7 @@ micrositeTwitterCreator := "@47deg"
 ```
 
 
-- `micrositeGithubOwner` and `micrositeGithubRepo`: Used to add links to the `GitHub` repo. It's also needed for publishing the site when `github4s` is chosen (see `micrositePushSiteWith` setting). Both `micrositeGithubOwner` and `micrositeGithubRepo` are required:
+- `micrositeGithubOwner` and `micrositeGithubRepo`: Used to add links to the `GitHub` repo. It's also needed for publishing the site when `github4s` is chosen (see `micrositePushSiteWith` setting). Defaults to the information found in the 'origin' Git remote, if such remote exists; otherwise they must be set like:
 
 ```scala
 micrositeGithubOwner := "47deg"

src/main/scala/microsites/MicrositeKeys.scala

@@ -164,8 +164,12 @@ trait MicrositeKeys {
   val micrositeFavicons: SettingKey[Seq[MicrositeFavicon]] = settingKey[Seq[MicrositeFavicon]](
     "Optional. List of filenames and sizes for the PNG/ICO files to be used as favicon for the generated site, located in '/microsite/img'. The sizes should be described with a string (i.e.: \"16x16\"). By default, favicons with different sizes will be generated from the navbar_brand2x.jpg file."
   )
-  val micrositeGithubOwner: SettingKey[String] = settingKey[String]("Microsite Github owner")
-  val micrositeGithubRepo: SettingKey[String]  = settingKey[String]("Microsite Github repo")
+  val micrositeGithubOwner: SettingKey[String] = settingKey[String](
+    "Microsite Github owner, defaults to the information found in the 'origin' Git remote"
+  )
+  val micrositeGithubRepo: SettingKey[String] = settingKey[String](
+    "Microsite Github repo, defaults to the information found in the 'origin' Git remote"
+  )
   val micrositeGithubToken: SettingKey[Option[String]] =
     settingKey[Option[String]]("Microsite Github token for pushing the microsite")
   val micrositeGithubLinks: SettingKey[Boolean] = settingKey[Boolean](

src/main/scala/microsites/MicrositesPlugin.scala

@@ -28,6 +28,8 @@ import tut.TutPlugin.autoImport._
 import mdoc.MdocPlugin
 import mdoc.MdocPlugin.autoImport._
 
+import scala.util.control.NonFatal
+
 object MicrositesPlugin extends AutoPlugin {
 
   object autoImport extends MicrositeAutoImportSettings
@@ -112,8 +114,8 @@ object MicrositesPlugin extends AutoPlugin {
     },
     micrositeFavicons := Seq(),
     micrositeVersionList := Seq(),
-    micrositeGithubOwner := "",
-    micrositeGithubRepo := "",
+    micrositeGithubOwner := gitRemoteInfo._1,
+    micrositeGithubRepo := gitRemoteInfo._2,
     micrositeGithubToken := None,
     micrositeGitHostingService := GitHub,
     micrositeGitHostingUrl := "",
@@ -130,4 +132,27 @@ object MicrositesPlugin extends AutoPlugin {
     commands ++= Seq(publishMicrositeCommand),
     javaOptions += "-Djava.awt.headless=true"
   )
+
+  /** Gets the Github user and repository from the git remote info */
+  private val gitRemoteInfo = {
+    import scala.sys.process._
+
+    val identifier = """([^\/]+)"""
+
+    val GitHubHttps   = s"https://github.com/$identifier/$identifier".r
+    val SSHConnection = s"git@github.com:$identifier/$identifier.git".r
+
+    try {
+      val remote = List("git", "ls-remote", "--get-url", "origin").!!.trim()
+
+      remote match {
+        case GitHubHttps(user, repo)   => (user, repo)
+        case SSHConnection(user, repo) => (user, repo)
+        case _                         => ("", "")
+      }
+    } catch {
+      case NonFatal(_) => ("", "")
+    }
+  }
+
 }