Add iolanguage

packages/daybook.nix

@@ -10,8 +10,8 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ pandoc ];
   buildPhase = ''
-    mkdir -p $out/share/man/man1
-    pandoc --standalone --to man daybook.1.md -o $out/share/man/man1/daybook.1
+    mkdir -p $out/man/man1
+    pandoc --standalone --to man daybook.1.md -o $out/man/man1/daybook.1
   '';
   installPhase = ''
     mkdir -p $out/bin

packages/iolanguage.nix

@@ -0,0 +1,23 @@
+{ stdenv, cmake, python3, fetchFromGitHub }:
+stdenv.mkDerivation rec {
+  version = "2017.09.06";
+  name = "iolanguage-${version}";
+  src = fetchFromGitHub {
+    owner = "IoLanguage";
+    repo = "io";
+    rev = "${version}";
+    sha256 = "07rg1zrz6i6ghp11cm14w7bbaaa1s8sb0y5i7gr2sds0ijlpq223";
+    fetchSubmodules = true;
+  };
+  buildInputs = [ cmake python3 ];
+  preBuild = "mkdir -p build && cd build";
+  buildPhase = ''
+    cmake -DCMAKE_INSTALL_PREFIX=$out/ ..
+    make all
+  '';
+  meta = with stdenv.lib; {
+    homepage = https://iolanguage.org/;
+    description = "Io programming language. Inspired by Self, Smalltalk and LISP.";
+    license = licenses.bsd3;
+  };
+}