Add a D version

source/main.d

@@ -0,0 +1,33 @@
+import elna.backend;
+import elna.ir;
+import elna.arguments;
+import std.path;
+import std.sumtype;
+import tanya.container.string;
+import tanya.memory.allocator;
+import tanya.memory.mmappool;
+
+int main(string[] args)
+{
+    defaultAllocator = MmapPool.instance;
+
+    return Arguments.parse(args).match!(
+        (ArgumentError argumentError) => 4,
+        (Arguments arguments) {
+            String outputFilename;
+            if (arguments.output is null)
+            {
+                outputFilename = arguments
+                    .inFile
+                    .baseName
+                    .withExtension("o");
+            }
+            else
+            {
+                outputFilename = String(arguments.output);
+            }
+
+            return generate(arguments.inFile, outputFilename);
+        }
+    );
+}