Annotate type signature of public methods and fields

This file was littered with intellij warnings due to public members and
fields not having their types annotated. Although in this case it didn't
really matter, it is good practice to always annotate public methods and
fields so that they can evolve in a binary compatible way.

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

@@ -11,21 +11,21 @@ import sbt.util.Level
 import sbt.internal.util.complete.HistoryCommands
 
 object BasicCommandStrings {
-  val HelpCommand = "help"
-  val CompletionsCommand = "completions"
-  val Exit = "exit"
-  val Quit = "quit"
-  val TemplateCommand = "new"
+  val HelpCommand: String = "help"
+  val CompletionsCommand: String = "completions"
+  val Exit: String = "exit"
+  val Quit: String = "quit"
+  val TemplateCommand: String = "new"
 
   /** The command name to terminate the program.*/
   val TerminateAction: String = Exit
 
-  def helpBrief =
+  def helpBrief: (String, String) =
     (
       HelpCommand,
       s"Displays this help message or prints detailed help on requested commands (run '$HelpCommand <command>')."
     )
-  def helpDetailed = s"""$HelpCommand
+  def helpDetailed: String = s"""$HelpCommand
 
 	Prints a help summary.
 
@@ -38,12 +38,12 @@ $HelpCommand <regular expression>
 	Searches the help according to the provided regular expression.
 """
 
-  def CompletionsDetailed =
+  def CompletionsDetailed: String =
     "Displays a list of completions for the given argument string (run 'completions <string>')."
-  def CompletionsBrief = (CompletionsCommand, CompletionsDetailed)
+  def CompletionsBrief: (String, String) = (CompletionsCommand, CompletionsDetailed)
 
-  def templateBrief = (TemplateCommand, "Creates a new sbt build.")
-  def templateDetailed =
+  def templateBrief: (String, String) = (TemplateCommand, "Creates a new sbt build.")
+  def templateDetailed: String =
     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.
@@ -52,14 +52,14 @@ $HelpCommand <regular expression>
     sbt new scala/scala-seed.g8
   """
 
-  def HistoryHelpBrief =
-    (HistoryCommands.Start -> "History command help.  Lists and describes all history commands.")
+  def HistoryHelpBrief: (String, String) =
+    (HistoryCommands.Start, "History command help.  Lists and describes all history commands.")
   def historyHelp =
     Help(Nil, (HistoryHelpBrief +: HistoryCommands.descriptions).toMap, Set(HistoryCommands.Start))
 
-  def exitBrief = "Terminates the build."
+  def exitBrief: String = "Terminates the build."
 
-  def logLevelHelp = {
+  def logLevelHelp: Help = {
     val levels = Level.values.toSeq
     val levelList = levels.mkString(", ")
     val brief =
@@ -83,7 +83,7 @@ $HelpCommand <regular expression>
 		* if no other commands are passed, interactive mode is still entered
 """
 
-  def runEarly(command: String) = s"$EarlyCommand($command)"
+  def runEarly(command: String): String = s"$EarlyCommand($command)"
   private[sbt] def isEarlyCommand(s: String): Boolean = {
     val levelOptions = Level.values.toSeq flatMap { elem =>
       List("-" + elem, "--" + elem)
@@ -93,27 +93,27 @@ $HelpCommand <regular expression>
     (s.startsWith("-" + AddPluginSbtFileCommand) || s.startsWith("--" + AddPluginSbtFileCommand))
   }
 
-  val EarlyCommand = "early"
-  val EarlyCommandBrief =
+  val EarlyCommand: String = "early"
+  val EarlyCommandBrief: (String, String) =
     (s"$EarlyCommand(<command>)", "Schedules a command to run before other commands on startup.")
-  val EarlyCommandDetailed =
+  val EarlyCommandDetailed: String =
     s"""$EarlyCommand(<command>)
 
 	Schedules an early command, which will be run before other commands on the command line.
 	The order is preserved between all early commands, so `sbt "early(a)" "early(b)"` executes `a` and `b` in order.
 """
 
-  def addPluginSbtFileHelp = {
+  def addPluginSbtFileHelp(): Help = {
     val brief =
       (s"--$AddPluginSbtFileCommand=<file>", "Adds the given *.sbt file to the plugin build.")
     Help(brief)
   }
 
-  val AddPluginSbtFileCommand = "addPluginSbtFile"
+  val AddPluginSbtFileCommand: String = "addPluginSbtFile"
 
-  def ReadCommand = "<"
-  def ReadFiles = " file1 file2 ..."
-  def ReadDetailed =
+  def ReadCommand: String = "<"
+  def ReadFiles: String = " file1 file2 ..."
+  def ReadDetailed: String =
     ReadCommand + ReadFiles + """
 
 	Reads the lines from the given files and inserts them as commands.
@@ -126,16 +126,16 @@ $HelpCommand <regular expression>
 
 	You probably need to escape this command if entering it at your shell."""
 
-  def ApplyCommand = "apply"
-  def ApplyDetailed =
+  def ApplyCommand: String = "apply"
+  def ApplyDetailed: String =
     ApplyCommand + """ [-cp|-classpath <classpath>] <module-name>*
 	Transforms the current State by calling <module-name>.apply(currentState) for each listed module name.
 	Here, currentState is of type sbt.State.
    If a classpath is provided, modules are loaded from a new class loader for this classpath.
 """
 
-  def RebootCommand = "reboot"
-  def RebootDetailed =
+  def RebootCommand: String = "reboot"
+  def RebootDetailed: String =
     RebootCommand + """ [dev | full]
 
 	This command is equivalent to exiting sbt, restarting, and running the
@@ -148,25 +148,25 @@ $HelpCommand <regular expression>
 	If 'full' is specified, the boot directory is wiped out before restarting.
 """
 
-  def Multi = ";"
-  def MultiBrief =
+  def Multi: String = ";"
+  def MultiBrief: (String, String) =
     (
       Multi + " <command> (" + Multi + " <command>)*",
       "Runs the provided semicolon-separated commands."
     )
-  def MultiDetailed =
+  def MultiDetailed: String =
     Multi + " command1 " + Multi + """ command2 ...
 
 	Runs the specified commands."""
 
-  def AppendCommand = "append"
-  def AppendLastDetailed =
+  def AppendCommand: String = "append"
+  def AppendLastDetailed: String =
     AppendCommand + """ <command>
 	Appends 'command' to list of commands to run.
 """
 
-  val AliasCommand = "alias"
-  def AliasDetailed =
+  val AliasCommand: String = "alias"
+  def AliasDetailed: String =
     s"""$AliasCommand
 
 	Prints a list of defined aliases.
@@ -186,31 +186,32 @@ $AliasCommand name=
 	Removes the alias for `name`."""
 
   def Shell = "shell"
-  def ShellDetailed =
+  def ShellDetailed: String =
     "Provides an interactive prompt and network server from which commands can be run."
 
   def StartServer = "startServer"
-  def StartServerDetailed =
+  def StartServerDetailed: String =
     s"""$StartServer
 	Starts the server if it has not been started. This is intended to be used with
 	-Dsbt.server.autostart=false."""
 
-  def OldShell = "oldshell"
+  def OldShell: String = "oldshell"
   def OldShellDetailed = "Provides an interactive prompt from which commands can be run."
 
-  def Client = "client"
-  def ClientDetailed = "Provides an interactive prompt from which commands can be run on a server."
-  def DashClient = "-client"
-  def DashDashClient = "--client"
+  def Client: String = "client"
+  def ClientDetailed: String =
+    "Provides an interactive prompt from which commands can be run on a server."
+  def DashClient: String = "-client"
+  def DashDashClient: String = "--client"
 
-  def StashOnFailure = "sbtStashOnFailure"
-  def PopOnFailure = "sbtPopOnFailure"
+  def StashOnFailure: String = "sbtStashOnFailure"
+  def PopOnFailure: String = "sbtPopOnFailure"
 
-  def FailureWall = "resumeFromFailure"
+  def FailureWall: String = "resumeFromFailure"
 
-  def ClearOnFailure = "sbtClearOnFailure"
-  def OnFailure = "onFailure"
-  def OnFailureDetailed =
+  def ClearOnFailure: String = "sbtClearOnFailure"
+  def OnFailure: String = "onFailure"
+  def OnFailureDetailed: String =
     OnFailure + """ command
 
 	Registers 'command' to run when a command fails to complete normally.
@@ -229,9 +230,10 @@ $AliasCommand name=
 	$IfLastCommon"""
 
   val ContinuousExecutePrefix = "~"
-  def continuousDetail = "Executes the specified command whenever source files change."
-  def continuousBriefHelp = (ContinuousExecutePrefix + " <command>", continuousDetail)
-  def FlushFileTreeRepository = "flushFileTreeRepository"
+  def continuousDetail: String = "Executes the specified command whenever source files change."
+  def continuousBriefHelp: (String, String) =
+    (ContinuousExecutePrefix + " <command>", continuousDetail)
+  def FlushFileTreeRepository: String = "flushFileTreeRepository"
   def FlushDetailed: String =
     "Resets the global file repository in the event that the repository has become inconsistent " +
       "with the file system."