Refactor Driver

 - Make parts more reusable
 - Introduce hook "sourcesRequired" that controls whether
   no sources on the command line give a help message.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/dotty/tools/dotc/config/CompilerCommand.scala b/src/dotty/tools/dotc/config/CompilerCommand.scala
index 3ba8db3ba..e34ca07f9 100644
--- a/src/dotty/tools/dotc/config/CompilerCommand.scala
+++ b/src/dotty/tools/dotc/config/CompilerCommand.scala
@@ -60,7 +60,7 @@ object CompilerCommand extends DotClass {
    *  are already applied in context.
    *  @return  The list of files to compile.
    */
-  def checkUsage(summary: ArgsSummary)(implicit ctx: Context): List[String] = {
+  def checkUsage(summary: ArgsSummary, sourcesRequired: Boolean)(implicit ctx: Context): List[String] = {
     val settings = ctx.settings
 
     /** Creates a help message for a subset of options based on cond */
@@ -121,8 +121,7 @@ object CompilerCommand extends DotClass {
       ctx.println(infoMessage)
       Nil
     } else {
-      if (summary.arguments.isEmpty && !settings.resident.value)
-        ctx.println(usageMessage)
+      if (sourcesRequired && summary.arguments.isEmpty) ctx.println(usageMessage)
       summary.arguments
     }
   }