unittest.d builds itself with correct dub buildtype/conf if built incorrectly.

unittest.d

@@ -1,16 +1,61 @@
+#!/usr/bin/rdmd
 
 //          Copyright Ferdinand Majerech 2011.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
 
-import dyaml.all;
-
-import std.stdio;
-
-
-void main()
+version(unittest)
 {
-    writeln("Done");
+    import dyaml.all;
+
+
+    import dyaml.testcompare;
+    import dyaml.testconstructor;
+    import dyaml.testemitter;
+    import dyaml.testerrors;
+    import dyaml.testinputoutput;
+    import dyaml.testreader;
+    import dyaml.testrepresenter;
+    import dyaml.testresolver;
+    import dyaml.testtokens;
+}
+
+void main(string[] args)
+{
+    import std.stdio;
+    version(unittest)
+    {
+        writeln("Done");
+    }
+    else 
+    {
+        writeln("This is not a unittest build. Trying to build one.");
+
+        void build(string type)
+        {
+            import std.process;
+            const processArgs = ["dub", "build", "-c=unittest", "-b=" ~ type ~ "-unittest"];
+            if(spawnProcess(processArgs).wait() != 0)
+            {
+                writeln("Build failed!");
+            }
+        }
+        import std.algorithm;
+        import std.array;
+        args.popFront();
+        if(args.empty)
+        {
+            build("debug");
+        }
+        else if(["debug", "release", "profile"].canFind(args[0]))
+        {
+            build(args[0]);
+        }
+        else 
+        {
+            writeln("Unknown unittest build type: ", args[0]);
+        }
+    }
 }