Add support for MAC OS X

This closes #2.

arbtt.cabal

@@ -77,13 +77,21 @@ executable arbtt-capture
         build-depends:
              Win32
     else
-        extra-libraries: Xss
-        other-modules:
-            Capture.X11
-            Graphics.X11.XScreenSaver
-            System.Locale.SetLocale
-        build-depends:
-            X11 > 1.4.4
+        if os(darwin)
+            cpp-options:    -DDARWIN
+            frameworks: Foundation Carbon IOKit
+            other-modules:
+                Capture.OSX
+                Graphics.OSX.Window
+                System.Locale.SetLocale
+        else
+            extra-libraries: Xss
+            other-modules:
+                Capture.X11
+                Graphics.X11.XScreenSaver
+                System.Locale.SetLocale
+            build-depends:
+                X11 > 1.4.4
     default-language: Haskell98
 
 executable arbtt-stats

arbtt.html

@@ -176,6 +176,21 @@ <h3>Source installations</h3>
                         you'll probably need to put the full path to arbtt-capture
                         in the Exec line of the .desktop file.</p>
                     </li>
+
+                    <li>
+                        <b>Mac OS X support:</b>
+                        <p>arbtt can run on Mac OS X systems. To compile it, you need to install the pkgconfig and pcre source packages
+                        using <a href="http://brew.sh">Homebrew</a> or <a href="https://www.macports.org">MacPorts</a>. For Homebrew, you can execute:</p>
+                        <code class="command">brew install pkgconfig</code><br>
+                        <code class="command">brew install pcre</code><br>
+                        <p>or for MacPorts:</p>
+                        <code class="command">sudo port install pkgconfig</code><br>
+                        <code class="command">sudo port install pcre</code><br>
+                        <p>Then, you can compile arbtt using the usual cabal commands.</p>
+                        <p>If you use MacPorts and have a linking error, it may be because of a conflict between the system libiconv and the MacPorts libiconv.
+                        Execute the following cabal command to resolve the conflict:</p>
+                        <code class="command">cabal configure --extra-lib-dir=/usr/lib</code><br>
+                        <p>When the installation is done, your arbtt binaries will be located in <code>~/Library/Haskell/bin</code> or <code>~/.cabal/bin</code>.</p>
                     </li>
                 </ul>
             </section>

src/Capture.hs

@@ -1,15 +1,19 @@
 {-# LANGUAGE CPP #-}
 
 module Capture (
-#ifdef WIN32
+#if defined(WIN32)
         module Capture.Win32
+#elif defined(DARWIN)
+        module Capture.OSX
 #else
         module Capture.X11
 #endif
         ) where
 
-#ifdef WIN32
+#if defined(WIN32)
 import Capture.Win32
+#elif defined(DARWIN)
+import Capture.OSX
 #else
 import Capture.X11
 #endif