1 files changed, 88 insertions, 0 deletions
diff --git a/plugins/base/src/main/kotlin/renderers/FileWriter.kt b/plugins/base/src/main/kotlin/renderers/FileWriter.kt
new file mode 100644
index 00000000..181295c0
--- /dev/null
+++ b/plugins/base/src/main/kotlin/renderers/FileWriter.kt
@@ -0,0 +1,88 @@
+package org.jetbrains.dokka.base.renderers
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import org.jetbrains.dokka.plugability.DokkaContext
+import java.io.File
+import java.io.IOException
+import java.net.URI
+import java.nio.file.*
+
+class FileWriter(val context: DokkaContext): OutputWriter {
+    private val createdFiles: MutableSet<String> = mutableSetOf()
+    private val jarUriPrefix = "jar:file:"
+    private val root = context.configuration.outputDir
+
+    override suspend fun write(path: String, text: String, ext: String) {
+        if (createdFiles.contains(path)) {
+            context.logger.error("An attempt to write ${root}/$path several times!")
+            return
+        }
+        createdFiles.add(path)
+
+        try {
+            val dir = Paths.get(root, path.dropLastWhile { it != '/' }).toFile()
+            withContext(Dispatchers.IO) {
+                dir.mkdirsOrFail()
+                Files.write(Paths.get(root, "$path$ext"), text.lines())
+            }
+        } catch (e: Throwable) {
+            context.logger.error("Failed to write $this. ${e.message}")
+            e.printStackTrace()
+        }
+    }
+
+    override suspend fun writeResources(pathFrom: String, pathTo: String) =
+        if (javaClass.getResource(pathFrom).toURI().toString().startsWith(jarUriPrefix)) {
+            copyFromJar(pathFrom, pathTo)
+        } else {
+            copyFromDirectory(pathFrom, pathTo)
+        }
+
+
+    private suspend fun copyFromDirectory(pathFrom: String, pathTo: String) {
+        val dest = Paths.get(root, pathTo).toFile()
+        val uri = javaClass.getResource(pathFrom).toURI()
+        withContext(Dispatchers.IO) {
+            File(uri).copyRecursively(dest, true)
+        }
+    }
+
+    private suspend fun copyFromJar(pathFrom: String, pathTo: String) {
+        val rebase = fun(path: String) =
+            "$pathTo/${path.removePrefix(pathFrom)}"
+        val dest = Paths.get(root, pathTo).toFile()
+        dest.mkdirsOrFail()
+        val uri = javaClass.getResource(pathFrom).toURI()
+        val fs = getFileSystemForURI(uri)
+        val path = fs.getPath(pathFrom)
+        for (file in Files.walk(path).iterator()) {
+            if (Files.isDirectory(file)) {
+                val dirPath = file.toAbsolutePath().toString()
+                withContext(Dispatchers.IO) {
+                    Paths.get(root, rebase(dirPath)).toFile().mkdirsOrFail()
+                }
+            } else {
+                val filePath = file.toAbsolutePath().toString()
+                withContext(Dispatchers.IO) {
+                    Paths.get(root, rebase(filePath)).toFile().writeBytes(
+                        this@FileWriter.javaClass.getResourceAsStream(filePath).readBytes()
+                    )
+                }
+            }
+        }
+    }
+
+    private fun File.mkdirsOrFail() {
+        if (!mkdirs() && !exists()) {
+            throw IOException("Failed to create directory $this")
+        }
+    }
+
+    private fun getFileSystemForURI(uri: URI): FileSystem =
+        try {
+            FileSystems.newFileSystem(uri, emptyMap<String, Any>())
+        } catch (e: FileSystemAlreadyExistsException) {
+            FileSystems.getFileSystem(uri)
+        }
+}
+\ No newline at end of file