pkgs/games: Add Invisigun Heroes

This introduces support for fetching games from itch.io, because the
Humble Bundle version unfortunately only provides a Steam key and we
obviously don't want that.

I only played two levels, but so far it works as intended.

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

3 files changed, 137 insertions, 0 deletions

diff --git a/pkgs/games/itch/default.nix b/pkgs/games/itch/default.nix
new file mode 100644
index 00000000..34ffc6ed
--- /dev/null
+++ b/pkgs/games/itch/default.nix
@@ -0,0 +1,28 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.itch;
+
+  self = rec {
+    callPackage = pkgs.lib.callPackageWith (pkgs // self);
+    callPackage_i686 = pkgs.lib.callPackageWith (pkgs.pkgsi686Linux // self);
+
+    fetchItch = callPackage ./fetch-itch {
+      inherit (config.itch) apiKey;
+    };
+
+    invisigun-heroes = callPackage ./invisigun-heroes.nix {};
+  };
+in {
+  options.itch.apiKey = lib.mkOption {
+    type = lib.types.nullOr lib.types.str;
+    default = null;
+    description = ''
+      The API key of your <link xlink:href="https://itch.io/">itch.io</link>
+      account, can be retrieved by heading to <link
+      xlink:href="https://itch.io/user/settings/api-keys"/>.
+    '';
+  };
+
+  config.packages.itch = lib.mkIf (cfg.apiKey != null) self;
+}
diff --git a/pkgs/games/itch/fetch-itch/default.nix b/pkgs/games/itch/fetch-itch/default.nix
new file mode 100644
index 00000000..ed1ac7f6
--- /dev/null
+++ b/pkgs/games/itch/fetch-itch/default.nix
@@ -0,0 +1,54 @@
+{ stdenv, curl, cacert, writeText, python3Packages
+
+, apiKey
+}:
+
+{ name, gameId, uploadId, sha256 }:
+
+let
+  cafile = "${cacert}/etc/ssl/certs/ca-bundle.crt";
+
+  getDownloadURL = writeText "getitch.py" ''
+    import os, sys, json
+
+    from urllib.parse import urljoin
+    from urllib.request import urlopen
+
+    API_KEY = os.getenv('apiKey')
+    API_URL = 'https://itch.io/api/1/'
+    API_BASE = urljoin(API_URL, API_KEY) + '/'
+
+    NAME = os.getenv('name')
+    GAME_ID = int(os.getenv('gameId'))
+    UPLOAD_ID = int(os.getenv('uploadId'))
+
+    def request(path):
+      with urlopen(urljoin(API_BASE, path)) as u:
+        return json.loads(u.read())
+
+    for key in request('my-owned-keys')['owned_keys']:
+      if key['game']['id'] == GAME_ID:
+        url = 'download-key/{}/download/{}'.format(key['id'], UPLOAD_ID)
+        sys.stdout.write(request(url)['url'] + '\n')
+        raise SystemExit(0)
+
+    sys.stderr.write('Unable to find download for game {}!'.format(NAME))
+    raise SystemExit(1)
+  '';
+
+in stdenv.mkDerivation {
+  inherit name apiKey gameId uploadId;
+  outputHashAlgo = "sha256";
+  outputHash = sha256;
+
+  SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
+
+  nativeBuildInputs = [ python3Packages.python ];
+
+  buildCommand = ''
+    url="$(python "${getDownloadURL}")"
+    header "downloading $name from $url"
+    "${curl.bin or curl}/bin/curl" --fail --output "$out" "$url"
+    stopNest
+  '';
+}
diff --git a/pkgs/games/itch/invisigun-heroes.nix b/pkgs/games/itch/invisigun-heroes.nix
new file mode 100644
index 00000000..86350033
--- /dev/null
+++ b/pkgs/games/itch/invisigun-heroes.nix
@@ -0,0 +1,55 @@
+{ stdenv, fetchItch, unzip, mesa, xorg, libpulseaudio, libudev
+, gtk2-x11, gdk_pixbuf, glib
+}:
+
+stdenv.mkDerivation rec {
+  name = "invisigun-heroes-${version}";
+  version = "1.5.1";
+
+  src = fetchItch {
+    name = "${name}.zip";
+    gameId = 25561;
+    uploadId = 208583;
+    sha256 = "0k92xj3q7yv3pgsb992y0lxp59f1gkl12vw18qipsm1vby6b7j2s";
+  };
+
+  unpackCmd = ''
+    ${unzip}/bin/unzip -qq -d invisigun-heroes "$src" || :
+  '';
+
+  arch = if stdenv.system == "x86_64-linux" then "x86_64" else "x86";
+  executable = "Invisigun Heroes.${arch}";
+
+  buildPhase = let
+    rpath = stdenv.lib.makeLibraryPath [
+      stdenv.cc.cc mesa xorg.libX11 xorg.libXcursor xorg.libXrandr
+      libpulseaudio libudev
+    ];
+
+    ssRpath = stdenv.lib.makeLibraryPath [
+      stdenv.cc.cc gtk2-x11 gdk_pixbuf glib
+    ];
+  in ''
+    patchelf \
+      --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
+      --set-rpath ${stdenv.lib.escapeShellArg rpath} "$executable"
+
+    patchelf --set-rpath ${stdenv.lib.escapeShellArg ssRpath} \
+      "Invisigun Heroes_Data/Plugins/x86_64/ScreenSelector.so"
+  '';
+
+  installPhase = ''
+    install -vD "$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;
+}