Fix cygwin problems. Handle @ and -color settings.

Author: BarkingBad

compiler/src/dotty/tools/MainGenericRunner.scala

@@ -72,7 +72,8 @@ object MainGenericRunner {
   val classpathSeparator = File.pathSeparator
 
   @sharable val javaOption = raw"""-J(.*)""".r
-
+  @sharable val scalaOption = raw"""@.*""".r
+  @sharable val colorOption = raw"""-color:.*""".r
   @tailrec
   def process(args: List[String], settings: Settings): Settings = args match
     case Nil =>
@@ -98,12 +99,17 @@ object MainGenericRunner {
       process(tail, settings.withSave)
     case (o @ javaOption(striped)) :: tail =>
       process(tail, settings.withJavaArgs(striped).withScalaArgs(o))
+    case (o @ scalaOption(_*)) :: tail =>
+      process(tail, settings.withScalaArgs(o))
+    case (o @ colorOption(_*)) :: tail =>
+      process(tail, settings.withScalaArgs(o))
     case arg :: tail =>
       val line = Try(Source.fromFile(arg).getLines.toList).toOption.flatMap(_.headOption)
       if arg.endsWith(".scala") || arg.endsWith(".sc") || (line.nonEmpty && raw"#!.*scala".r.matches(line.get)) then
         settings
           .withExecuteMode(ExecuteMode.Script)
           .withTargetScript(arg)
+          .withResidualArgs(s"-Dscript.path=$arg")
           .withScriptArgs(tail*)
       else
         val newSettings = if arg.startsWith("-") then settings else settings.withModeShouldBeRun

dist/bin/scala

@@ -30,6 +30,7 @@ source "$PROG_HOME/bin/common"
 
 # exec here would prevent onExit from being called, leaving terminal in unusable state
 compilerJavaClasspathArgs
+[ -z "${ConEmuPID-}" -o -n "${cygwin-}" ] && export MSYSTEM= PWD= # workaround for #12405
 eval "\"$JAVACMD\"" "-classpath \"$jvm_cp_args\"" "dotty.tools.MainGenericRunner" "-classpath \"$jvm_cp_args\"" "$@"
 scala_exit_status=$?