add dhall-to-yaml-ng

default.nix

@@ -16,4 +16,8 @@
   dhall-nix-simple = import ./dhall-nix-simple.nix {
     inherit pkgs;
   };
+
+  dhall-yaml-simple = import ./dhall-yaml-simple.nix {
+    inherit pkgs;
+  };
 }

dhall-yaml-simple.nix

@@ -0,0 +1,24 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.stdenv.mkDerivation rec {
+  name = "dhall-yaml-simple";
+
+  src = if pkgs.stdenv.isDarwin
+  then pkgs.fetchurl {
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.29.0/dhall-yaml-1.0.1-x86_64-macos.tar.bz2";
+    sha256 = "0rg1gsr6fhx71sadr8xcwik202jfbpwcvgj3bjzbvsx8hvn2cy13";
+  }
+  else pkgs.fetchurl {
+    url = "https://github.com/dhall-lang/dhall-haskell/releases/download/1.29.0/dhall-yaml-1.0.1-x86_64-linux.tar.bz2";
+    sha256 = "13gnqq3xjilrs4zmp7c7jybyw9xa7ipi3kkrp7mr826vypcwlrga";
+  };
+
+  installPhase = ''
+    mkdir -p $out/bin
+    DHALL_TO_YAML=$out/bin/dhall-to-yaml-ng
+    install -D -m555 -T dhall-to-yaml-ng $DHALL_TO_YAML
+
+    mkdir -p $out/etc/bash_completion.d/
+    $DHALL_TO_YAML --bash-completion-script $DHALL_TO_YAML > $out/etc/bash_completion.d/dhall-to-yaml-completion.bash
+  '';
+}

shell.nix

@@ -12,5 +12,6 @@ in
       dhall-json-simple
       dhall-bash-simple
       dhall-nix-simple
+      dhall-yaml-simple
     ];
   }

test.bash

@@ -18,5 +18,6 @@ test_exe dhall;
 test_exe dhall-to-json;
 test_exe dhall-to-bash;
 test_exe dhall-to-nix;
+test_exe dhall-to-yaml;
 
 exit $ERRORS;