add homebrew info; remove hardcoded path to qt plugins

Author: 646b

README.md

@@ -63,8 +63,17 @@ For Arch Linux, two packages [ldoce5viewer](https://aur.archlinux.org/packages/l
 
 (for advanced users)
 
+*Homebrew*:
+```bash
+$ brew install pyqt
+$ pip install lxml pyobjc-core pyobjc-framework-Cocoa whoosh py2app
+$ # inside ldoce5viewer directory
+$ sudo DISTUTILS_DEBUG=1 python setup.py py2app
+$ open dist/LDOCE5\ Viewer.app/
+```
+
+Or if you are using *MacPorts*:
 <ol>
-  <li><p>Install MacPorts</p></li>
   <li><p>Install the following ports:</p>
     <ul>
       <li>python27 (or python3x)</li>

setup.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import subprocess
 from distutils.core import setup
 from ldoce5viewer import __version__
 
@@ -60,6 +61,8 @@ def iter_static():
 except ImportError:
     pass
 else:
+    qt_plugins_path = subprocess.check_output('qmake -query QT_INSTALL_PLUGINS', shell=True)
+    qt_plugins_path = qt_plugins_path[0:len(qt_plugins_path)-1] # remove "\n"
     extra_options.update(dict(
         name='LDOCE5 Viewer',
         app=['ldoce5viewer.py'],
@@ -90,7 +93,7 @@ def iter_static():
             #]
         }},
         data_files=[
-            ('qt_plugins/imageformats', ['/opt/local/share/qt4/plugins/imageformats/libqjpeg.dylib']),
+            ('qt_plugins/imageformats', [qt_plugins_path]),
             ('', ['ldoce5viewer/static']),
         ],
     ))