fix sbt help new does not explain how to use sbt new

main-command/src/main/scala/sbt/BasicCommandStrings.scala

@@ -41,8 +41,14 @@ $HelpCommand <regular expression>
   def CompletionsBrief = (CompletionsCommand, CompletionsDetailed)
 
   def templateBrief = (TemplateCommand, "Creates a new sbt build.")
-  def templateDetailed = TemplateCommand + """ [--options] <template>
-  Create a new sbt build based on the given template."""
+  def templateDetailed =
+    TemplateCommand + """ [--options] <template>
+  Create a new sbt build based on the given template.
+  sbt provides out-of-the-box support for Giter8 templates. See foundweekends.org/giter8/ for details.
+  
+  Example:
+    sbt new scala/scala-seed.g8
+  """
 
   def HistoryHelpBrief =
     (HistoryCommands.Start -> "History command help.  Lists and describes all history commands.")

main-command/src/main/scala/sbt/BasicCommands.scala

@@ -87,10 +87,20 @@ object BasicCommands {
   }
 
   def runHelp(s: State, h: Help)(arg: Option[String]): State = {
-    val message = try Help.message(h, arg)
+
+    val (extraArgs, remainingCommands) = s.remainingCommands match {
+      case xs :+ exec if exec.commandLine == "shell" => (xs, exec :: Nil)
+      case xs                                        => (xs, Nil)
+    }
+
+    val topic = (arg.toList ++ extraArgs.map(_.commandLine)) match {
+      case Nil => None
+      case xs  => Some(xs.mkString(" "))
+    }
+    val message = try Help.message(h, topic)
     catch { case NonFatal(ex) => ex.toString }
     System.out.println(message)
-    s
+    s.copy(remainingCommands = remainingCommands)
   }
 
   def completionsCommand: Command =

notes/1.0.3/help-sbt-new.md

@@ -0,0 +1,13 @@
+[@panaeon]: https://github.com/panaeon
+
+[#2932]: https://github.com/sbt/sbt/issues/2939
+
+### Bug fixes
+
+- Make sure that when `sbt help <command>` is executed from the command line it behaves similar to `sbt "help <command>"`.
+- Add basic example and link to gitter8 templates page to `sbt new` help message.
+
+### Note:
+Unfortunately `sbt help shell` will print default general help message and drop to the sbt shell instead of displaying sbt shell help. 
+Also now `help` command will consume commands after it so `;help smth; other cmd` will not work.
+