games/invisigun-heroes: Factor out into buildUnity

There are a lot of Unity games out there, so it's a good idea to have a
generic builder just for Unity, which we then can apply to a lot more
games.

Right now this is a pretty basic abstraction which I've only tested with
Invisigun Heroes.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

4 files changed, 67 insertions, 38 deletions

diff --git a/pkgs/games/build-support/build-unity.nix b/pkgs/games/build-support/build-unity.nix
new file mode 100644
index 00000000..701ace91
--- /dev/null
+++ b/pkgs/games/build-support/build-unity.nix
@@ -0,0 +1,49 @@
+{ stdenv, mesa, xorg, libpulseaudio, libudev }:
+
+{ name, version, fullName, buildPhase ? "", rpath ? [], ... }@attrs:
+
+let
+  arch = if stdenv.system == "x86_64-linux" then "x86_64" else "x86";
+  executable = "${fullName}.${arch}";
+  dataDir = "${fullName}_Data";
+
+in stdenv.mkDerivation ({
+  name = "${name}-${version}";
+  inherit version arch executable dataDir;
+  slugName = name;
+
+  buildPhase = let
+    mainRpath = stdenv.lib.makeLibraryPath ([
+      stdenv.cc.cc mesa xorg.libX11 xorg.libXcursor xorg.libXrandr
+      libpulseaudio libudev
+    ] ++ rpath);
+  in ''
+    runHook preBuild
+
+    patchelf \
+      --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
+      --set-rpath ${stdenv.lib.escapeShellArg mainRpath} "$executable"
+
+    ${buildPhase}
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    install -vD "$executable" "$out/libexec/$slugName/$slugName"
+    ln -s "$out/share/$slugName" "$out/libexec/$slugName/Data"
+
+    mkdir -p "$out/bin"
+    ln -s "$out/libexec/$slugName/$slugName" "$out/bin/$slugName"
+
+    mkdir -p "$out/share"
+    cp -vRd "$dataDir" "$out/share/$slugName"
+
+    runHook postInstall
+  '';
+
+  dontStrip = true;
+  dontPatchELF = true;
+} // removeAttrs attrs [ "name" "version" "fullName" "buildPhase" "rpath" ])
diff --git a/pkgs/games/build-support/default.nix b/pkgs/games/build-support/default.nix
new file mode 100644
index 00000000..8b6b466d
--- /dev/null
+++ b/pkgs/games/build-support/default.nix
@@ -0,0 +1,5 @@
+{ callPackage, ... }:
+
+{
+  buildUnity = callPackage ./build-unity.nix {};
+}
diff --git a/pkgs/games/default.nix b/pkgs/games/default.nix
index cef568cf..b775610d 100644
--- a/pkgs/games/default.nix
+++ b/pkgs/games/default.nix
@@ -25,12 +25,17 @@ let
         description = "Available collections of games.";
       };
     };
+
+    config._module.args.pkgs = let
+      buildSupport = import ./build-support {
+        callPackage = lib.callPackageWith (pkgs // buildSupport);
+      };
+    in buildSupport // pkgs;
   };
 
 in (pkgs.lib.evalModules {
   modules = [
     (if config == null then configFilePath else config)
     baseModule ./humblebundle ./steam ./itch
-    { config._module.args.pkgs = pkgs; }
   ];
 }).config.packages
diff --git a/pkgs/games/itch/invisigun-heroes.nix b/pkgs/games/itch/invisigun-heroes.nix
index 04fd06a8..4ab28f92 100644
--- a/pkgs/games/itch/invisigun-heroes.nix
+++ b/pkgs/games/itch/invisigun-heroes.nix
@@ -1,13 +1,12 @@
-{ stdenv, fetchItch, unzip, mesa, xorg, libpulseaudio, libudev
-, gtk2-x11, gdk_pixbuf, glib
-}:
+{ stdenv, lib, buildUnity, fetchItch, unzip, gtk2-x11, gdk_pixbuf, glib }:
 
-stdenv.mkDerivation rec {
-  name = "invisigun-heroes-${version}";
+buildUnity rec {
+  name = "invisigun-heroes";
+  fullName = "Invisigun Heroes";
   version = "1.5.30";
 
   src = fetchItch {
-    name = "${name}.zip";
+    name = "${name}-${version}.zip";
     gameId = 25561;
     uploadId = 208583;
     version = "v${version}";
@@ -18,39 +17,10 @@ stdenv.mkDerivation rec {
     ${unzip}/bin/unzip -qq -d invisigun-heroes "$src" || :
   '';
 
-  arch = if stdenv.system == "x86_64-linux" then "x86_64" else "x86";
-  executable = "Invisigun Heroes.${arch}";
-
   buildPhase = let
-    rpath = stdenv.lib.makeLibraryPath [
-      stdenv.cc.cc mesa xorg.libX11 xorg.libXcursor xorg.libXrandr
-      libpulseaudio libudev
-    ];
-
-    ssRpath = stdenv.lib.makeLibraryPath [
-      stdenv.cc.cc gtk2-x11 gdk_pixbuf glib
-    ];
+    rpath = lib.makeLibraryPath [ stdenv.cc.cc gtk2-x11 gdk_pixbuf glib ];
   in ''
-    patchelf \
-      --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
-      --set-rpath ${stdenv.lib.escapeShellArg rpath} "$executable"
-
-    patchelf --set-rpath ${stdenv.lib.escapeShellArg ssRpath} \
+    patchelf --set-rpath ${lib.escapeShellArg rpath} \
       "Invisigun Heroes_Data/Plugins/x86_64/ScreenSelector.so"
   '';
-
-  installPhase = ''
-    install -vD "$executable" "$out/libexec/invisigun-heroes/invisigun-heroes"
-    ln -s "$out/share/invisigun-heroes" "$out/libexec/invisigun-heroes/Data"
-
-    mkdir -p "$out/bin"
-    ln -s "$out/libexec/invisigun-heroes/invisigun-heroes" \
-          "$out/bin/invisigun-heroes"
-
-    mkdir -p "$out/share"
-    cp -vRd "Invisigun Heroes_Data" "$out/share/invisigun-heroes"
-  '';
-
-  dontStrip = true;
-  dontPatchELF = true;
 }