Generate BuildConfig.kt.

src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinProjectInfo.kt

@@ -11,8 +11,33 @@ class KotlinProjectInfo : IProjectInfo {
     override val defaultSourceDirectories = hashSetOf("src/main/kotlin", "src/main/resources")
     override val defaultTestDirectories = hashSetOf("src/test/kotlin", "src/test/resources")
 
+    private fun generate(type: String, name: String, value: Any) =
+            "        val $name : $type = $value"
+
     override fun generateBuildConfig(packageName: String, variant: Variant, buildConfigs: List<BuildConfig>) : String {
-        return "package $packageName"
+        val lines = arrayListOf<String>()
+        with(lines) {
+            add("package $packageName")
+            add("")
+            add("class BuildConfig {")
+            add("    companion object {")
+            if (variant.productFlavor != null) {
+                add(generate("String", "PRODUCT_FLAVOR", "\"" + variant.productFlavor.name + "\""))
+            }
+            if (variant.buildType != null) {
+                add(generate("String", "BUILD_TYPE", "\"" + variant.buildType.name + "\""))
+            }
+            buildConfigs.forEach {
+                it.fields.forEach { field ->
+                    add(generate(field.type, field.name, field.value))
+                }
+            }
+            add("    }")
+            add("}")
+            add("")
+        }
+
+        return lines.joinToString("\n")
     }
 }