Merge pull request sbt#3551 from eed3si9n/wip/autostart

`sbt.server.autostart` flag and startServer

Author: eed3si9n

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

@@ -161,6 +161,12 @@ $AliasCommand name=
   def ShellDetailed =
     "Provides an interactive prompt and network server from which commands can be run."
 
+  def StartServer = "startServer"
+  def StartServerDetailed =
+    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 OldShellDetailed = "Provides an interactive prompt from which commands can be run."
 

main/src/main/scala/sbt/Main.scala

@@ -195,6 +195,7 @@ object BuiltinCommands {
       multi,
       shell,
       oldshell,
+      startServer,
       BasicCommands.client,
       continuous,
       eval,
@@ -737,6 +738,12 @@ object BuiltinCommands {
     else newState.clearGlobalLog
   }
 
+  def startServer: Command =
+    Command.command(StartServer, Help.more(StartServer, StartServerDetailed)) { s0 =>
+      val exchange = StandardMain.exchange
+      exchange.runServer(s0)
+    }
+
   private val sbtVersionRegex = """sbt\.version\s*=.*""".r
   private def isSbtVersionLine(s: String) = sbtVersionRegex.pattern matcher s matches ()
 

main/src/main/scala/sbt/internal/CommandExchange.scala

@@ -23,6 +23,9 @@ import scala.util.{ Success, Failure }
  * this exchange, which could serve command request from either of the channel.
  */
 private[sbt] final class CommandExchange {
+  private val autoStartServer = sys.props.get("sbt.server.autostart") map {
+    _.toLowerCase == "true"
+  } getOrElse true
   private val lock = new AnyRef {}
   private var server: Option[ServerInstance] = None
   private var consoleChannel: Option[ConsoleChannel] = None
@@ -61,13 +64,17 @@ private[sbt] final class CommandExchange {
         consoleChannel = Some(x)
         subscribe(x)
     }
-    runServer(s)
+    if (autoStartServer) runServer(s)
+    else s
   }
 
   private def newChannelName: String = s"channel-${nextChannelId.incrementAndGet()}"
 
-  private def runServer(s: State): State = {
-    val port = (s get serverPort) match {
+  /**
+   * Check if a server instance is running already, and start one if it isn't.
+   */
+  private[sbt] def runServer(s: State): State = {
+    def port = (s get serverPort) match {
       case Some(x) => x
       case None    => 5001
     }

notes/1.0.2.markdown

@@ -0,0 +1,37 @@
+This is a hotfix release for sbt 1.0.x series.
+
+### Bug fixes
+
+- Fixes terminal echo issue. [#3507][3507] by [@kczulko][@kczulko]
+- Fixes `deliver` task, and adds `makeIvyXml` as a more sensibly named task. [#3487][3487] by [@cunei][@cunei]
+- Replaces the deprecated use of `OkUrlFactory`, and fixes connection leaks. [lm#164][lm164] by [@dpratt][@dpratt]
+- Refixes false positive in DSL checker for setting keys. [#3513][3513] by [@dwijnand][@dwijnand]
+- Fixes `run` and `bgRun` not picking up changes to directories in the classpath. [#3517][3517] by [@dwijnand][@dwijnand]
+- Fixes `++` so it won't change the value of `crossScalaVersion`. [#3495][3495]/[#3526][3526] by [@dwijnand][@dwijnand]
+- Fixes sbt server missing some messages. [#3523][3523] by [@guillaumebort][@guillaumebort]
+- Refixes `consoleProject`. [zinc#386][zinc386] by [@dwijnand][@dwijnand]
+- Adds JVM flag `sbt.gigahorse` to enable/disable the internal use of Gigahorse to workaround NPE in `JavaNetAuthenticator` when used in conjunction with `repositories` override. [lm#167][lm167] by [@cunei][@cunei]
+- Adds JVM flag `sbt.server.autostart` to enable/disable the automatic starting of sbt server with the sbt shell. This also adds new `startServer` command to manually start the server. by [@eed3si9n][@eed3si9n]
+
+### Internal
+
+- Fixes unused import warnings. [#3533][3533] by [@razvan-panda][@razvan-panda]
+
+  [@dwijnand]: https://github.com/dwijnand
+  [@cunei]: https://github.com/cunei
+  [@eed3si9n]: https://github.com/eed3si9n
+  [@dpratt]: https://github.com/dpratt
+  [@kczulko]: https://github.com/kczulko
+  [@razvan-panda]: https://github.com/razvan-panda
+  [@guillaumebort]: https://github.com/guillaumebort
+  [3487]: https://github.com/sbt/sbt/pull/3487
+  [lm164]: https://github.com/sbt/librarymanagement/pull/164
+  [3495]: https://github.com/sbt/sbt/issues/3495
+  [3526]: https://github.com/sbt/sbt/pull/3526
+  [3513]: https://github.com/sbt/sbt/pull/3513
+  [3517]: https://github.com/sbt/sbt/pull/3517
+  [3507]: https://github.com/sbt/sbt/pull/3507
+  [3533]: https://github.com/sbt/sbt/pull/3533
+  [3523]: https://github.com/sbt/sbt/pull/3523
+  [zinc386]: https://github.com/sbt/zinc/pull/386
+  [lm167]: https://github.com/sbt/librarymanagement/pull/167