Stub support for kotlin (jvm) target

Code is compiled into a monolithic jar including all dependencies and
run using the kotlin command (/usr/bin/java can't see the kotlin
runtime libraries).

File extensions:
 - *.kt (kotlin)
 - *.ktm (kotlin module)
 - *.kts (kotlin script)

mainclass for kotlin is FilenameKt. This could also be retrieved from
the jar file with a command like:

unzip -c binary.jar META-INF/MANIFEST.MF \
  | dos2unix \
  | egrep ^Main-Class: \
  | cut -d: \
  --complement -f1

Author: hex539

examples/hello/submissions/accepted/hello.kt

@@ -0,0 +1,4 @@
+fun main(args: Array<String>) {
+  val words = if (args.size == 0) arrayOf("Hello", "World!") else args
+  System.`out`.println(words.joinToString(separator = " "))
+}

problemtools/languages.yaml

@@ -141,6 +141,13 @@ javascript:
     compile: '/usr/bin/js24 -c {files}'
     run: '/usr/bin/js24 "{mainfile}"'
 
+kotlin:
+    name: 'Kotlin'
+    priority: 250
+    files: '*.kt *.ktm *.kts'
+    compile: '/usr/bin/kotlinc -jvm-target 1.8 -d {path}/ -- {files}'
+    run: '/usr/bin/kotlin -J-XX:+UseSerialGC -J-Xss64m -J-Xms{memlim}m -J-Xmx{memlim}m -cp {path}/ {mainclass}'
+
 objectivec:
     name: 'Objective C'
     priority: 300

problemtools/run/source.py

@@ -69,7 +69,11 @@ def __init__(self, path, language, work_dir=None, include_dir=None):
                                           re.IGNORECASE)), None)
         if self.mainfile is None:
             self.mainfile = self.src[0]
+
         self.mainclass = os.path.splitext(os.path.basename(self.mainfile))[0]
+        if self.language.name == 'Kotlin':
+          self.mainclass = self.mainclass.capitalize() + 'Kt'
+
         self.binary = os.path.join(self.path, 'run')
 
 
@@ -123,7 +127,7 @@ def get_runcmd(self, cwd=None, memlim=1024):
 
     def should_skip_memory_rlimit(self):
         """Ugly hack (see program.py for details)."""
-        return self.language.name in ['Java', 'Scala']
+        return self.language.name in ['Java', 'Scala', 'Kotlin']
 
 
     def __str__(self):