Remove intellij-core usages from kotlin-gradle-plugin-integration-tests

We can use only relocated intellij-core from kotlin-compiler-embeddable.
Non-source usages do not resolve in IDE (which also breaks debugger).

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt

@@ -1,6 +1,5 @@
 package org.jetbrains.kotlin.gradle
 
-import org.jetbrains.kotlin.com.intellij.openapi.util.io.FileUtil
 import org.gradle.api.logging.LogLevel
 import org.jetbrains.kotlin.gradle.util.*
 import org.junit.After
@@ -21,7 +20,7 @@ abstract class BaseGradleIT {
 
     @Before
     fun setUp() {
-        workingDir = FileUtil.createTempDirectory("BaseGradleIT", null)
+        workingDir = createTempDir("BaseGradleIT")
         acceptAndroidSdkLicenses()
     }
 
@@ -105,7 +104,7 @@ abstract class BaseGradleIT {
         }
 
         private fun createNewWrapperDir(version: String): File =
-                FileUtil.createTempDirectory("GradleWrapper-", version, /* deleteOnExit */ true)
+            createTempDir("GradleWrapper-$version")
                         .apply {
                             File(BaseGradleIT.resourcesRootFile, "GradleWrapper").copyRecursively(this)
                             val wrapperProperties = File(this, "gradle/wrapper/gradle-wrapper.properties")
@@ -345,8 +344,8 @@ abstract class BaseGradleIT {
     }
 
     fun CompiledProject.assertContainFiles(expected: Iterable<String>, actual: Iterable<String>, messagePrefix: String = ""): CompiledProject {
-        val expectedNormalized = expected.map(FileUtil::normalize).toSortedSet()
-        val actualNormalized = actual.map(FileUtil::normalize).toSortedSet()
+        val expectedNormalized = expected.map(::normalizePath).toSortedSet()
+        val actualNormalized = actual.map(::normalizePath).toSortedSet()
         assertTrue(actualNormalized.containsAll(expectedNormalized), messagePrefix + "expected files: ${expectedNormalized.joinToString()}\n  !in actual files: ${actualNormalized.joinToString()}")
         return this
     }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt

@@ -17,10 +17,8 @@
 package org.jetbrains.kotlin.gradle
 
 import org.gradle.api.logging.LogLevel
-import org.jetbrains.kotlin.com.intellij.openapi.util.io.FileUtil
 import org.jetbrains.kotlin.gradle.plugin.CopyClassesToJavaOutputStatus
 import org.jetbrains.kotlin.gradle.tasks.USING_INCREMENTAL_COMPILATION_MESSAGE
-import org.jetbrains.kotlin.gradle.plugin.*
 import org.jetbrains.kotlin.gradle.util.*
 import org.junit.Test
 import java.io.File
@@ -63,7 +61,7 @@ class KotlinGradleIT: BaseGradleIT() {
             assertSuccessful()
         }
 
-        val wd2 = FileUtil.createTempDirectory("testRunningInDifferentDir", null)
+        val wd2 = createTempDir("testRunningInDifferentDir")
         wd1.copyRecursively(wd2)
         wd1.deleteRecursively()
         assert(!wd1.exists())

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/util/fileUtil.kt

@@ -1,6 +1,7 @@
 package org.jetbrains.kotlin.gradle.util
 
 import java.io.File
+import java.nio.file.Files
 
 fun File.getFileByName(name: String): File =
         findFileByName(name) ?: throw AssertionError("Could not find file with name '$name' in $this")
@@ -24,3 +25,67 @@ fun File.modify(transform: (String)->String) {
     writeText(transform(readText()))
 }
 
+fun createTempDir(prefix: String): File =
+    Files.createTempDirectory(prefix).toFile().apply {
+        deleteOnExit()
+    }
+
+/**
+ * converts back slashes to forward slashes
+ * removes double slashes inside the path, e.g. "x/y//z" => "x/y/z"
+ *
+ * Converted from com.intellij.openapi.util.io.FileUtil.normalize
+ */
+fun normalizePath(path: String): String {
+    var start = 0
+    var separator = false
+    if (isWindows) {
+        if (path.startsWith("//")) {
+            start = 2
+            separator = true
+        } else if (path.startsWith("\\\\")) {
+            return normalizeTail(0, path, false)
+        }
+    }
+
+    for (i in start until path.length) {
+        val c = path[i]
+        if (c == '/') {
+            if (separator) {
+                return normalizeTail(i, path, true)
+            }
+            separator = true
+        } else if (c == '\\') {
+            return normalizeTail(i, path, separator)
+        } else {
+            separator = false
+        }
+    }
+
+    return path
+}
+
+private fun normalizeTail(prefixEnd: Int, path: String, separator: Boolean): String {
+    var separator = separator
+    val result = StringBuilder(path.length)
+    result.append(path, 0, prefixEnd)
+    var start = prefixEnd
+    if (start == 0 && isWindows && (path.startsWith("//") || path.startsWith("\\\\"))) {
+        start = 2
+        result.append("//")
+        separator = true
+    }
+
+    for (i in start until path.length) {
+        val c = path[i]
+        if (c == '/' || c == '\\') {
+            if (!separator) result.append('/')
+            separator = true
+        } else {
+            result.append(c)
+            separator = false
+        }
+    }
+
+    return result.toString()
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/util/gradleRunningUtils.kt

@@ -47,10 +47,10 @@ fun runProcess(
 }
 
 fun createGradleCommand(wrapperDir: File, tailParameters: List<String>): List<String> {
-    return if (isWindows())
+    return if (isWindows)
         listOf("cmd", "/C", "${wrapperDir.absolutePath}/gradlew.bat") + tailParameters
     else
         listOf("/bin/bash", "${wrapperDir.absolutePath}/gradlew") + tailParameters
 }
 
-private fun isWindows(): Boolean = System.getProperty("os.name")!!.contains("Windows")
+val isWindows: Boolean = System.getProperty("os.name")!!.contains("Windows")