first cut of a little bit of code generation to make sure we mirror most of the java.util.Iterable<T> methods to Array<T>

testlib/test/GenerateStandardLib.kt

@@ -0,0 +1,59 @@
+namespace kotlin.tools
+
+import std.*
+import std.io.*
+import std.util.*
+import java.io.*
+import java.util.*
+
+fun generateFile(outFile: File, header: String, typeName: String, inputFile: File) {
+  println("Parsing $inputFile and writing $outFile")
+
+  outFile.getParentFile()?.mkdirs()
+  val writer = PrintWriter(FileWriter(outFile))
+  try {
+    writer.println("// NOTE this file is auto-generated from $inputFile")
+    writer.println(header)
+
+    val reader = FileReader(inputFile).buffered()
+    try {
+      // TODO ideally we'd use a filterNot() here :)
+      val iter = reader.lineIterator()
+      while (iter.hasNext) {
+        val line = iter.next()
+
+        if (line.startsWith("package")) continue
+        val xform = line.replaceAll("java.lang.Iterable<T>", typeName).replaceAll("java.util.Collection<T>", typeName)
+        writer.println(xform)
+      }
+    } finally {
+      reader.close()
+      reader.close()
+    }
+  } finally {
+    writer.close()
+  }
+}
+
+
+/**
+ * Generates methods in the standard library which are mostly identical
+ * but just using a different input kind.
+ *
+ * Kinda like mimicking source macros here, but this avoids the inefficiency of type conversions
+ * at runtime.
+ */
+fun main(args: Array<String>) {
+  var stdlib = File("stdlib")
+  if (!stdlib.exists()) {
+    stdlib = File("../stdlib")
+    if (!stdlib.exists()) {
+      println("Cannot find stdlib!")
+      return
+    }
+  }
+  val srcDir = File(stdlib, "ktSrc")
+  val input = File(srcDir, "JavaIterables.kt")
+  val outDir = File(srcDir, "generated")
+  generateFile(File(outDir, "ArraysGenerated.kt"), "package std", "Array<T>", input)
+}