nixpkgs/pkgs/development/python-modules/Wand/libraries.patch

diff --git a/wand/api.py b/wand/api.py
index 2c18513..1a1b511 100644
--- a/wand/api.py
+++ b/wand/api.py
@@ -43,98 +43,6 @@ class c_magick_char_p(ctypes.c_char_p):
         """
         library.MagickRelinquishMemory(self)
 
-
-def library_paths():
-    """Iterates for library paths to try loading.  The result paths are not
-    guaranteed that they exist.
-
-    :returns: a pair of libwand and libmagick paths.  they can be the same.
-              path can be ``None`` as well
-    :rtype: :class:`tuple`
-
-    """
-    libwand = None
-    libmagick = None
-    versions = '', '-6', '-Q16', '-Q8', '-6.Q16'
-    options = '', 'HDRI', 'HDRI-2'
-    system = platform.system()
-    magick_home = os.environ.get('MAGICK_HOME')
-
-    if system == 'Windows':
-        # ImageMagick installers normally install coder and filter DLLs in
-        # subfolders, we need to add those folders to PATH, otherwise loading
-        # the DLL later will fail.
-        try:
-            with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,
-                                r"SOFTWARE\ImageMagick\Current") as reg_key:
-                libPath = winreg.QueryValueEx(reg_key, "LibPath")
-                coderPath = winreg.QueryValueEx(reg_key, "CoderModulesPath")
-                filterPath = winreg.QueryValueEx(reg_key, "FilterModulesPath")
-                magick_home = libPath[0]
-                os.environ['PATH'] += (';' + libPath[0] + ";" +
-                                       coderPath[0] + ";" + filterPath[0])
-        except OSError:
-            # otherwise use MAGICK_HOME, and we assume the coder and
-            # filter DLLs are in the same directory
-            pass
-
-    def magick_path(path):
-        return os.path.join(magick_home, *path)
-    combinations = itertools.product(versions, options)
-    for suffix in (version + option for version, option in combinations):
-        # On Windows, the API is split between two libs. On other platforms,
-        # it's all contained in one.
-        if magick_home:
-            if system == 'Windows':
-                libwand = 'CORE_RL_wand_{0}.dll'.format(suffix),
-                libmagick = 'CORE_RL_magick_{0}.dll'.format(suffix),
-                yield magick_path(libwand), magick_path(libmagick)
-                libwand = 'libMagickWand{0}.dll'.format(suffix),
-                libmagick = 'libMagickCore{0}.dll'.format(suffix),
-                yield magick_path(libwand), magick_path(libmagick)
-            elif system == 'Darwin':
-                libwand = 'lib', 'libMagickWand{0}.dylib'.format(suffix),
-                yield magick_path(libwand), magick_path(libwand)
-            else:
-                libwand = 'lib', 'libMagickWand{0}.so'.format(suffix),
-                yield magick_path(libwand), magick_path(libwand)
-        if system == 'Windows':
-            libwand = ctypes.util.find_library('CORE_RL_wand_' + suffix)
-            libmagick = ctypes.util.find_library('CORE_RL_magick_' + suffix)
-            yield libwand, libmagick
-            libwand = ctypes.util.find_library('libMagickWand' + suffix)
-            libmagick = ctypes.util.find_library('libMagickCore' + suffix)
-            yield libwand, libmagick
-        else:
-            libwand = ctypes.util.find_library('MagickWand' + suffix)
-            yield libwand, libwand
-
-
-def load_library():
-    """Loads the MagickWand library.
-
-    :returns: the MagickWand library and the ImageMagick library
-    :rtype: :class:`ctypes.CDLL`
-
-    """
-    tried_paths = []
-    for libwand_path, libmagick_path in library_paths():
-        if libwand_path is None or libmagick_path is None:
-            continue
-        try:
-            tried_paths.append(libwand_path)
-            libwand = ctypes.CDLL(libwand_path)
-            if libwand_path == libmagick_path:
-                libmagick = libwand
-            else:
-                tried_paths.append(libmagick_path)
-                libmagick = ctypes.CDLL(libmagick_path)
-        except (IOError, OSError):
-            continue
-        return libwand, libmagick
-    raise IOError('cannot find library; tried paths: ' + repr(tried_paths))
-
-
 if not hasattr(ctypes, 'c_ssize_t'):
     if ctypes.sizeof(ctypes.c_uint) == ctypes.sizeof(ctypes.c_void_p):
         ctypes.c_ssize_t = ctypes.c_int
@@ -176,43 +84,14 @@ class AffineMatrix(ctypes.Structure):
 # Preserve the module itself even if it fails to import
 sys.modules['wand._api'] = sys.modules['wand.api']
 
-try:
-    libraries = load_library()
-except (OSError, IOError):
-    msg = 'http://docs.wand-py.org/en/latest/guide/install.html'
-    if sys.platform.startswith(('dragonfly', 'freebsd')):
-        msg = 'pkg install'
-    elif sys.platform == 'win32':
-        msg += '#install-imagemagick-on-windows'
-    elif sys.platform == 'darwin':
-        mac_pkgmgrs = {'brew': 'brew install freetype imagemagick',
-                       'port': 'port install imagemagick'}
-        for pkgmgr in mac_pkgmgrs:
-            with os.popen('which ' + pkgmgr) as f:
-                if f.read().strip():
-                    msg = mac_pkgmgrs[pkgmgr]
-                    break
-        else:
-            msg += '#install-imagemagick-on-mac'
-    else:
-        distname, _, __ = platform.linux_distribution()
-        distname = (distname or '').lower()
-        if distname in ('debian', 'ubuntu'):
-            msg = 'apt-get install libmagickwand-dev'
-        elif distname in ('fedora', 'centos', 'redhat'):
-            msg = 'yum install ImageMagick-devel'
-    raise ImportError('MagickWand shared library not found.\n'
-                      'You probably had not installed ImageMagick library.\n'
-                      'Try to install:\n  ' + msg)
-
 #: (:class:`ctypes.CDLL`) The MagickWand library.
-library = libraries[0]
+library = ctypes.CDLL("@magick_wand_library@")
 
 #: (:class:`ctypes.CDLL`) The ImageMagick library.  It is the same with
 #: :data:`library` on platforms other than Windows.
 #:
 #: .. versionadded:: 0.1.10
-libmagick = libraries[1]
+libmagick = ctypes.CDLL("@imagemagick_library@")
 
 try:
     library.MagickWandGenesis.argtypes = []