command line script launcher

% ./bin/kotlin -script hello.ktscript
hello world

% cat hello.ktscript
fun hello(what: String) = println("hello $what")
hello("world")

Note it currently takes 8 seconds to evaluate hello world script.

compiler/integration-tests/data/help/help.expected

@@ -8,6 +8,7 @@ OUT   -altHeaders [String] Path to the alternative library headers paths
 OUT   -mode [String] Special compiler modes: stubs or altHeaders
 OUT   -output [String] output directory
 OUT   -module [String] module to compile
+OUT   -script [flag]
 OUT   -tags [flag]
 OUT   -verbose [flag]
 OUT   -version [flag]

compiler/integration-tests/data/script/hello.ktscript

@@ -0,0 +1 @@
+println("hello world")

compiler/integration-tests/data/script/script.expected

@@ -0,0 +1,2 @@
+OUT hello world
+Return code: 0

compiler/integration-tests/src/org/jetbrains/kotlin/CompilerSmokeTest.java

@@ -50,4 +50,9 @@ public class CompilerSmokeTest extends KotlinIntegrationTestBase {
 
         runCompiler("hello.compile", "-src", "hello.kt", "-jar", jar);
     }
+
+    @Test
+    public void script() throws Exception {
+        runCompiler("script", "-script", "hello.ktscript");
+    }
 }