Man and desktop entry additions

- Plus some splits into post and pre stages of the phases

pkgs/by-name/op/open-adventure/package.nix

@@ -7,6 +7,7 @@
   libedit,
   cppcheck,
   coreutils,
+  asciidoctor,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -23,6 +24,7 @@ stdenv.mkDerivation (finalAttrs: {
     python3Packages.python
     python3Packages.pyyaml
     pkg-config
+    asciidoctor
   ];
 
   buildInputs = [ libedit ];
@@ -44,13 +46,26 @@ stdenv.mkDerivation (finalAttrs: {
     substituteInPlace tests/tapview --replace-fail "/bin/echo" ${lib.getExe' coreutils "echo"}
   '';
 
+  postBuild = ''
+    make advent.6
+  '';
+
+  preInstall = ''
+    mkdir -vp "$out/bin" "$out/share/man/man6" "$out/share/applications/" "$out/share/icons/hicolor/scalable/apps"
+  '';
+
   installPhase = ''
     runHook preInstall
-    mkdir -p $out/bin
     cp ./advent $out/bin
     runHook postInstall
   '';
 
+  postInstall = ''
+    cp ./advent.6 $out/share/man/man6
+    cp ./advent.desktop $out/share/applications
+    cp ./advent.svg $out/share/icons/hicolor/scalable/apps
+  '';
+
   meta = {
     description = "Forward-port of the Crowther/Woods Adventure 2.5 game from 1995";
     longDescription = ''