rund: init at version 1.0.0

Adding a D Programming Language Compiler Wrapper tool that runs and caches D programs.  This is an alternative to the existing `rdmd` tool.  It's a rewrite that leverages a new compiler feature that allows it to run the compiler once instead of having to run it twice like `rdmd` does.  I decided to create a new tool rather than trying to support both older and new compilers in the same tool.  It also introduces new features like "Source Compiler Directives" which allow D Language source files to contain compiler configuration such as import paths, environment variables, etc.

pkgs/development/tools/rund/default.nix

@@ -0,0 +1,49 @@
+{stdenv, lib, fetchFromGitHub, ldc ? null, dcompiler ? ldc }:
+
+assert dcompiler != null;
+
+stdenv.mkDerivation rec {
+  pname = "rund";
+  version = "1.0.0";
+
+  src = fetchFromGitHub {
+    owner = "dragon-lang";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "10x6f1nn294r5qnpacrpcbp348dndz5fv4nz6ih55c61ckpkvgcf";
+  };
+
+  buildInputs = [ dcompiler ];
+  buildPhase = ''
+    for candidate in dmd ldmd2 gdmd; do
+      echo Checking for DCompiler $candidate ...
+      dc=$(type -P $candidate || echo "")
+      if [ ! "$dc" == "" ]; then
+        break
+      fi
+    done
+    if [ "$dc" == "" ]; then
+      exit "Error: could not find a D compiler"
+    fi
+    echo Using DCompiler $candidate
+    $dc -I=$src/src -i -run $src/make.d build --out $NIX_BUILD_TOP
+  '';
+
+  doCheck = true;
+  checkPhase = ''
+    $NIX_BUILD_TOP/rund make.d test
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    mv $NIX_BUILD_TOP/rund $out/bin
+  '';
+
+  meta = with stdenv.lib; {
+    description = "A compiler-wrapper that runs and caches D programs";
+    homepage = https://github.com/dragon-lang/rund;
+    license = lib.licenses.boost;
+    maintainers = with maintainers; [ jonathanmarler ];
+    platforms = stdenv.lib.platforms.unix;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -5943,6 +5943,8 @@ in
 
   runningx = callPackage ../tools/X11/runningx { };
 
+  rund = callPackage ../development/tools/rund { };
+
   runzip = callPackage ../tools/archivers/runzip { };
 
   rw = callPackage ../tools/misc/rw { };