Native: move samples to backend.native/tests/

kotlin-native/backend.native/tests/samples/curl/build.gradle.kts

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+plugins {
+    kotlin("multiplatform")
+}
+
+val localRepo = rootProject.file("build/.m2-local")
+
+repositories {
+    maven("file://$localRepo")
+}
+
+//val mingwPath = File(System.getenv("MINGW64_DIR") ?: "C:/msys64/mingw64")
+val mingwPath = File("C:/msys64/mingw64") // use only preinstalled verions from this path, otherwise fail with linkage errors
+
+kotlin {
+    // Determine host preset.
+    val hostOs = System.getProperty("os.name")
+    val isMingwX64 = hostOs.startsWith("Windows")
+
+    // Create target for the host platform.
+    val hostTarget = when {
+        hostOs == "Mac OS X" -> macosX64("curl")
+        hostOs == "Linux" -> linuxX64("curl")
+        isMingwX64 -> mingwX64("curl")
+        else -> throw GradleException("Host OS '$hostOs' is not supported in Kotlin/Native $project.")
+    }
+
+    hostTarget.apply {
+        binaries {
+            executable {
+                entryPoint = "sample.curl.main"
+                if (isMingwX64) {
+                    // Add lib path to `libcurl` and its dependencies:
+                    linkerOpts("-L${mingwPath.resolve("lib")}")
+                    runTask?.environment("PATH" to mingwPath.resolve("bin"))
+                }
+                runTask?.args("https://www.jetbrains.com/")
+            }
+        }
+    }
+
+    sourceSets {
+        val curlMain by getting {
+            dependencies {
+                implementation("org.jetbrains.kotlin.sample.native:libcurl:1.0")
+            }
+        }
+    }
+
+    // The code snippet below is needed to make all compile tasks depend on publication of
+    // "libcurl" library. So that to the time of compilation the library will already be
+    // in Maven repo and will be successfully resolved as a dependency of this project.
+    targets.all {
+        compilations.all {
+            compileKotlinTask.dependsOn(":libcurl:publish")
+        }
+    }
+}
+
+// The following snippet is needed to give instructions for IDEA user who just imported project
+// and sees "Could not resolve..." message in IDEA console.
+gradle.buildFinished {
+    val configurationName = kotlin.targets["curl"].compilations["main"].compileDependencyConfigurationName
+    val configuration = project.configurations[configurationName]
+    if (configuration.isCanBeResolved && configuration.state == Configuration.State.RESOLVED_WITH_FAILURES) {
+        println(
+            """
+                |
+                |IMPORTANT:
+                |The message about unresolved "libcurl" dependency likely means that "libcurl" has not been built and published to local Maven repo yet.
+                |Please run "publish" task for "libcurl" sub-project and re-import Kotlin/Native samples in IDEA.
+            """.trimMargin()
+        )
+    }
+}

kotlin-native/backend.native/tests/samples/curl/gradle.properties

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+kotlin.code.style=official
+kotlin.import.noCommonSourceSets=true

kotlin-native/backend.native/tests/samples/curl/src/curlMain/kotlin/main.kt

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+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package sample.curl
+
+import sample.libcurl.*
+
+fun main(args: Array<String>) {
+    if (args.isEmpty())
+        return help()
+
+    val curl = CUrl(args[0])
+    curl.header += {
+        println("[H] $it")
+    }
+
+    curl.body += {
+        println("[B] $it")
+    }
+
+    curl.fetch()
+    curl.close()
+}
+
+fun help() {
+    println("ERROR: missing URL command line argument")
+}
+