nxengine: import from homebrew/games.

Formula/nxengine.rb

@@ -0,0 +1,63 @@
+class Nxengine < Formula
+  desc "Rewrite of Cave Story (Doukutsu Monogatari)"
+  homepage "http://nxengine.sourceforge.net/"
+  url "http://nxengine.sourceforge.net/dl/nx-src-1006.tar.bz2"
+  version "1.0.0.6"
+  sha256 "cf9cbf15dfdfdc9936720a714876bb1524afbd2931e3eaa4c89984a40b21ad68"
+
+  bottle do
+    cellar :any
+    sha256 "6a41ce2306cb98480ef13ade6860c138491d8d8523605f50006f410608826e0e" => :el_capitan
+    sha256 "0cd1b84a302e7342833581497cfbb260af6ffa21280c7339cada8033c4c5be5d" => :yosemite
+    sha256 "96bd43fa469d10ff9d874f2d4a2125a1878f6eb0bad229ad4f0c7b0ff139b550" => :mavericks
+  end
+
+  depends_on "sdl"
+  depends_on "sdl_ttf"
+
+  # Freeware Cave Story 1.0.0.6 pre-patched with Aeon Genesis English translation
+  resource "game" do
+    url "http://www.cavestory.org/downloads/cavestoryen.zip"
+    sha256 "aa87fa30bee9b4980640c7e104791354e0f1f6411ee0d45a70af70046aa0685f"
+  end
+
+  def install
+    # Remove unused linux header
+    inreplace "platform/Linux/vbesync.c", "#include <libdrm\/drm\.h>", ""
+    # Replacement of htole16 for OS X
+    inreplace ["sound/org.cpp", "sound/pxt.cpp"] do |s|
+      s.gsub! "endian.h", "libkern/OSByteOrder.h"
+      s.gsub! "htole16", "OSSwapHostToLittleInt16"
+    end
+    # Use var/nxengine for extracted data files, without messing current directory
+    inreplace "graphics/font.cpp", /(fontfile) = "(\w+\.(bmp|ttf))"/, "\\1 = \"#{var}/nxengine/\\2\""
+    inreplace "platform.cpp", /(return .*fopen)\((fname), mode\);/, "char fn[256]; strcpy(fn, \"#{var}/nxengine/\"); strcat(fn, \\2); \\1(fn, mode);"
+    inreplace "graphics/nxsurface.cpp", /(image = SDL_LoadBMP)\((pbm_name)\);/, "char fn[256]; strcpy(fn, \"#{var}/nxengine/\"); strcat(fn, \\2); \\1(fn);"
+    inreplace "extract/extractpxt.cpp", /(mkdir)\((\".+\")/, "char dir[256]; strcpy(dir, \"#{var}/nxengine/\"); strcat(dir, \\2); \\1(dir"
+    inreplace "extract/extractfiles.cpp" do |s|
+      s.gsub! /char \*dir = strdup\((fname)\);/, "char *dir = (char *)malloc(256); strcpy(dir, \"#{var}/nxengine/\"); strcat(dir, \\1);"
+      s.gsub! "strchr", "strrchr"
+    end
+
+    system "make"
+    bin.install "nx"
+    pkgshare.install ["smalfont.bmp", "sprites.sif", "tilekey.dat"]
+    resource("game").stage do
+      pkgshare.install ["Doukutsu.exe", "data"]
+    end
+  end
+
+  def post_install
+    # Symlink original game data to a working directory in var
+    (var/"nxengine").mkpath
+    ln_sf Dir[pkgshare/"*"], "#{var}/nxengine/"
+    # Use system font, avoiding any license issue
+    ln_sf "/Library/Fonts/Courier New.ttf", "#{var}/nxengine/font.ttf"
+  end
+
+  def caveats; <<-EOS.undent
+    When the game runs first time, it will extract data files into the following directory:
+      #{var}/nxengine
+    EOS
+  end
+end