Add JVM part for calculator sample

Simple CLI Kotlin/JVM application making use of Kotlin parser library.
Fix #1222

samples/calculator/README.md

@@ -23,10 +23,24 @@ The sample consists of:
     framework by invoking Gradle from custom "Run Script" build phase, and this
     framework is imported into the Xcode project.
 
-    
+## Using the same code with Kotlin/JVM
+
 The library can also be compiled to a `.jar` by Kotlin/JVM compiler with Gradle. 
 Just run from the [sample root dir](../): 
 ```
 ./gradlew calculator:jar
 ```
 This will generate a `calculator.jar` in `build/libs/`.
+
+There is also simple Kotlin/JVM CLI app available in `jvmCliApp` subdirectory.
+To build and run it, use
+```
+./gradlew calculator:jvmCliApp:run
+```
+
+To build the distribution:
+```
+./gradlew calculator:jvmCliApp:distZip
+```
+(the result will be available as
+`jvmCliApp/build/distributions/KotlinCalculator.zip`)

samples/calculator/jvmCliApp/build.gradle

@@ -0,0 +1,24 @@
+buildscript {
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+apply plugin: 'kotlin'
+apply plugin: 'application'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile "org.jetbrains.kotlin:kotlin-stdlib"
+    compile project.parent
+}
+
+applicationName = "KotlinCalculator"
+
+mainClassName = 'org.konan.calculator.JvmCliKt'
+run {
+    args "2 + 2"
+}

samples/calculator/jvmCliApp/src/main/kotlin/org/konan/calculator/JvmCli.kt

@@ -0,0 +1,25 @@
+package org.konan.calculator
+
+import org.konan.arithmeticparser.*
+
+fun main(args: Array<String>) {
+    val expression = if (args.isNotEmpty()) {
+        args.first().also {
+            println(it)
+        }
+    } else {
+        println("Enter an expression:")
+        readLine()!!
+    }
+
+    val result = parseAndCompute(expression)
+    val computed = result.expression
+    if (computed != null) {
+        println(" = $computed")
+    } else {
+        println(" = ${result.partialExpression}")
+        result.remainder?.let {
+            println("Unable to parse suffix: $it")
+        }
+    }
+}

samples/settings.gradle

@@ -1,6 +1,7 @@
 // NOTE: If a new sample uses only platform libs,
 // please add it into the 'buildSamplesWithPlatfromLibs' task in build.gradle.
 include ':calculator'
+include ':calculator:jvmCliApp'
 include ':csvparser'
 include ':gitchurn'
 include ':globalState'