Add version subcommand to cmtc (#270)

cmtc/src/main/scala/com/lunatech/cmt/client/Main.scala

@@ -26,7 +26,8 @@ import com.lunatech.cmt.client.command.{
   PullTemplate,
   RestoreState,
   SaveState,
-  SetCurrentCourse
+  SetCurrentCourse,
+  Version
 }
 
 object Main extends CommandsEntryPoint:
@@ -44,4 +45,5 @@ object Main extends CommandsEntryPoint:
       PullTemplate.command,
       RestoreState.command,
       SaveState.command,
-      SetCurrentCourse.command)
+      SetCurrentCourse.command,
+      Version.command)

cmtc/src/main/scala/com/lunatech/cmt/client/command/Version.scala

@@ -0,0 +1,28 @@
+package com.lunatech.cmt.client.command
+
+import caseapp.{AppName, CommandName, HelpMessage, RemainingArgs}
+import com.lunatech.cmt.CmtError
+import com.lunatech.cmt.core.cli.CmtCommand
+import com.lunatech.cmt.core.execution.Executable
+import com.lunatech.cmt.core.validation.Validatable
+import com.lunatech.cmt.printResult
+import com.lunatech.cmt.version.BuildInfo
+object Version:
+  @AppName("version")
+  @CommandName("version")
+  @HelpMessage("Print version info")
+  final case class Options()
+
+  given Validatable[Version.Options] with
+    extension (options: Version.Options) def validated(): Either[CmtError, Version.Options] = Right(options)
+  end given
+
+  given Executable[Version.Options] with
+    extension (options: Version.Options) def execute(): Either[CmtError, String] = Right(BuildInfo.toString)
+  end given
+
+  val command: CmtCommand[Version.Options] = new CmtCommand[Version.Options] {
+
+    def run(options: Version.Options, args: RemainingArgs): Unit =
+      options.validated().flatMap(_.execute()).printResult()
+  }