Add a version command-line option (#99)

* [sbt] make name and version available within Scala

Available as `thorp.BuildInfo._`

* [core] ConfigOption Add Version option

* [cli] ParseArgs add command-line options `-V` and `--version`

* [core] ConfigQuery add showVersion query

* [cli] Program shows version then exit

* [cli] Main don't show "Done"

build.sbt

@@ -67,6 +67,11 @@ lazy val cli = (project in file("cli"))
   .settings(applicationSettings)
   .settings(commandLineParsing)
   .settings(testDependencies)
+  .enablePlugins(BuildInfoPlugin)
+  .settings(
+    buildInfoKeys := Seq[BuildInfoKey](name, version),
+    buildInfoPackage := "thorp"
+  )
   .settings(Seq(
     assemblyOption in assembly := (
       assemblyOption in assembly).value

cli/src/main/scala/net/kemitix/thorp/cli/Main.scala

@@ -13,7 +13,7 @@ object Main extends IOApp {
       .guaranteeCase {
           case Canceled => exitCaseLogger.warn("Interrupted")
           case Error(e) => exitCaseLogger.error(e.getMessage)
-          case Completed => exitCaseLogger.info("Done")
+          case Completed => IO.unit
       }
   }
 

cli/src/main/scala/net/kemitix/thorp/cli/ParseArgs.scala

@@ -13,6 +13,9 @@ object ParseArgs {
     OParser.sequence(
       programName("thorp"),
       head("thorp"),
+      opt[Unit]('V', "version")
+          .action((_, cos) => ConfigOption.Version :: cos)
+          .text("Show version"),
       opt[String]('s', "source")
         .action((str, cos) => ConfigOption.Source(Paths.get(str)) :: cos)
         .text("Source directory to sync to destination"),

cli/src/main/scala/net/kemitix/thorp/cli/Program.scala

@@ -11,13 +11,17 @@ trait Program {
 
   def apply(cliOptions: Seq[ConfigOption]): IO[ExitCode] = {
     implicit val logger: Logger = new PrintLogger()
-    for {
-      storageService <- defaultStorageService
-      actions <- Synchronise(storageService, defaultHashService, cliOptions).valueOrF(handleErrors)
-      events <- handleActions(UnversionedMirrorArchive.default(storageService), actions)
-      _ <- storageService.shutdown
-      _ <- SyncLogging.logRunFinished(events)
-    } yield ExitCode.Success
+    if (ConfigQuery.showVersion(cliOptions)) IO {
+        println(s"Thorp v${thorp.BuildInfo.version}")
+        ExitCode.Success
+    } else
+      for {
+        storageService <- defaultStorageService
+        actions <- Synchronise(storageService, defaultHashService, cliOptions).valueOrF(handleErrors)
+        events <- handleActions(UnversionedMirrorArchive.default(storageService), actions)
+        _ <- storageService.shutdown
+        _ <- SyncLogging.logRunFinished(events)
+      } yield ExitCode.Success
   }
 
   private def handleErrors(implicit logger: Logger): List[String] => IO[Stream[Action]] = {

core/src/main/scala/net/kemitix/thorp/core/ConfigOption.scala

@@ -10,6 +10,9 @@ sealed trait ConfigOption {
 }
 
 object ConfigOption {
+  case object Version extends ConfigOption {
+    override def update(config: Config): Config = config
+  }
   case class Source(path: Path) extends ConfigOption {
     override def update(config: Config): Config = config.copy(source = path.toFile)
   }

core/src/main/scala/net/kemitix/thorp/core/ConfigQuery.scala

@@ -2,6 +2,12 @@ package net.kemitix.thorp.core
 
 trait ConfigQuery {
 
+  def showVersion(configOptions: Seq[ConfigOption]): Boolean =
+    configOptions.exists {
+      case ConfigOption.Version => true
+      case _ => false
+    }
+
   def ignoreUserOptions(configOptions: Seq[ConfigOption]): Boolean =
     configOptions.exists {
       case ConfigOption.IgnoreUserOptions => true

project/plugins.sbt

@@ -1,2 +1,3 @@
 addSbtPlugin("ch.epfl.scala" % "sbt-bloop" % "1.3.2")
 addSbtPlugin("com.geirsson" % "sbt-ci-release" % "1.2.6")
+addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.9.0")