Fix not rebuilding on source change

Fixes #227

2 files changed, 71 insertions, 5 deletions

diff --git a/runners/gradle-integration-tests/src/test/kotlin/org/jetbrains/dokka/gradle/RebuildAfterSourceChangeTest.kt b/runners/gradle-integration-tests/src/test/kotlin/org/jetbrains/dokka/gradle/RebuildAfterSourceChangeTest.kt
new file mode 100644
index 00000000..42e79696
--- /dev/null
+++ b/runners/gradle-integration-tests/src/test/kotlin/org/jetbrains/dokka/gradle/RebuildAfterSourceChangeTest.kt
@@ -0,0 +1,69 @@
+package org.jetbrains.dokka.gradle
+
+import org.gradle.testkit.runner.TaskOutcome
+import org.junit.Test
+import java.nio.file.Path
+import kotlin.test.assertEquals
+
+class RebuildAfterSourceChangeTest : AbstractDokkaGradleTest() {
+
+    fun prepareTestData(testDataRootPath: String): Pair<Path, Path> {
+        val testDataRoot = testDataFolder.resolve(testDataRootPath)
+        val tmpRoot = testProjectDir.root.toPath()
+
+        testDataRoot.resolve("src").copy(tmpRoot.resolve("src"))
+        testDataRoot.resolve("build.gradle").copy(tmpRoot.resolve("build.gradle"))
+        testDataRoot.resolve("settings.gradle").copy(tmpRoot.resolve("settings.gradle"))
+
+        return testDataRoot to tmpRoot
+    }
+
+    private fun doTest(gradleVersion: String, kotlinVersion: String) {
+
+        val (testDataRoot, tmpRoot) = prepareTestData("sourcesChange")
+        val docsOutput = "build/dokka"
+
+        configure(gradleVersion, kotlinVersion, arguments = arrayOf("dokka", "--stacktrace")).build().let { result ->
+            println(result.output)
+
+            assertEquals(TaskOutcome.SUCCESS, result.task(":dokka")?.outcome)
+        }
+
+
+        configure(gradleVersion, kotlinVersion, arguments = arrayOf("dokka", "--stacktrace")).build().let { result ->
+            println(result.output)
+
+            assertEquals(TaskOutcome.UP_TO_DATE, result.task(":dokka")?.outcome)
+        }
+
+        checkOutputStructure("sourcesChange/fileTree.txt", docsOutput)
+
+        testDataRoot.resolve("src1").copy(tmpRoot.resolve("src"))
+
+        configure(gradleVersion, kotlinVersion, arguments = arrayOf("dokka", "--stacktrace")).build().let { result ->
+            println(result.output)
+
+            assertEquals(TaskOutcome.SUCCESS, result.task(":dokka")?.outcome)
+        }
+
+
+        checkOutputStructure("sourcesChange/fileTree1.txt", docsOutput)
+
+    }
+
+
+    @Test
+    fun `test kotlin 1_1_2 and gradle 3_5`() {
+        doTest("3.5", "1.1.2")
+    }
+
+    @Test
+    fun `test kotlin 1_0_7 and gradle 2_14_1`() {
+        doTest("2.14.1", "1.0.7")
+    }
+
+    @Test
+    fun `test kotlin 1_1_2 and gradle 4_0`() {
+        doTest("4.0", "1.1.2")
+    }
+}
\ No newline at end of file
diff --git a/runners/gradle-integration-tests/src/test/kotlin/org/jetbrains/dokka/gradle/Utils.kt b/runners/gradle-integration-tests/src/test/kotlin/org/jetbrains/dokka/gradle/Utils.kt
index d44459b1..6f17af22 100644
--- a/runners/gradle-integration-tests/src/test/kotlin/org/jetbrains/dokka/gradle/Utils.kt
+++ b/runners/gradle-integration-tests/src/test/kotlin/org/jetbrains/dokka/gradle/Utils.kt
@@ -3,10 +3,7 @@ package org.jetbrains.dokka.gradle
 import com.intellij.rt.execution.junit.FileComparisonFailure
 import java.io.File
 import java.io.IOException
-import java.nio.file.FileVisitResult
-import java.nio.file.Files
-import java.nio.file.Path
-import java.nio.file.SimpleFileVisitor
+import java.nio.file.*
 import java.nio.file.attribute.BasicFileAttributes
 
 
@@ -48,7 +45,7 @@ class CopyFileVisitor(private var sourcePath: Path?, private val targetPath: Pat
     @Throws(IOException::class)
     override fun visitFile(file: Path,
                            attrs: BasicFileAttributes): FileVisitResult {
-        Files.copy(file, targetPath.resolve(sourcePath?.relativize(file)))
+        Files.copy(file, targetPath.resolve(sourcePath?.relativize(file)), StandardCopyOption.REPLACE_EXISTING)
         return FileVisitResult.CONTINUE
     }
 }