Add new modules to standard library

modules/system/src/main/kotlin/io/smnp/ext/SystemModule.kt

@@ -0,0 +1,10 @@
+package io.smnp.ext
+
+import io.smnp.ext.function.ExitFunction
+import io.smnp.ext.function.SleepFunction
+import org.pf4j.Extension
+
+@Extension
+class SystemModule : NativeModuleProvider("smnp.system") {
+   override fun functions() = listOf(ExitFunction(), SleepFunction())
+}

modules/system/src/main/kotlin/io/smnp/ext/function/ExitFunction.kt

@@ -0,0 +1,19 @@
+package io.smnp.ext.function
+
+import io.smnp.callable.function.Function
+import io.smnp.callable.function.FunctionDefinitionTool
+import io.smnp.callable.signature.Signature.Companion.simple
+import io.smnp.type.enumeration.DataType.INT
+import io.smnp.type.matcher.Matcher.Companion.ofType
+import io.smnp.type.matcher.Matcher.Companion.optional
+import io.smnp.type.model.Value
+import kotlin.system.exitProcess
+
+class ExitFunction : Function("exit") {
+   override fun define(new: FunctionDefinitionTool) {
+      new function simple(optional(ofType(INT))) body { _, arguments ->
+         val exitCode = arguments.getOrNull(0) ?: Value.int(0)
+         exitProcess(exitCode.value!! as Int)
+      }
+   }
+}

modules/system/src/main/kotlin/io/smnp/ext/function/SleepFunction.kt

@@ -0,0 +1,17 @@
+package io.smnp.ext.function
+
+import io.smnp.callable.function.Function
+import io.smnp.callable.function.FunctionDefinitionTool
+import io.smnp.callable.signature.Signature.Companion.simple
+import io.smnp.type.enumeration.DataType.INT
+import io.smnp.type.matcher.Matcher.Companion.ofType
+import io.smnp.type.model.Value
+
+class SleepFunction : Function("sleep") {
+   override fun define(new: FunctionDefinitionTool) {
+      new function simple(ofType(INT)) body { _, (milli) ->
+         Thread.sleep((milli.value!! as Int).toLong())
+         Value.void()
+      }
+   }
+}