Move the download code from a hook that runs during installation (no longer supported) to a script you run after installation.

README.rst

@@ -29,24 +29,22 @@ Installation
 Installation by hand::
 
     python setup.py install
+    pycorpora-download
 
 Installation with pip::
 
     pip install --no-cache-dir pycorpora
+    pycorpora-download
 
 The package does not include data from the Corpora Project; instead, the data
-is downloaded when the package is installed (using either of the methods
-above). By default, the "master" branch of the `Corpora Project GitHub
-repository <https://github.com/dariusk/corpora>`_ is used as the source for the
-data. You can specify an alternative URL to download the data from using the
-argument ``--corpora-zip-url`` on the command line with either of the two
-methods above::
+is downloaded by the `pycorpora-download` script (installed when
+the pycorpora package is installed). By default, the "master" branch of the
+ `Corpora Project GitHub repository <https://github.com/dariusk/corpora>`_ is
+used as the source for the data. You can specify an alternative URL to
+download the data from using the argument ``--corpora-zip-url`` on the command
+line when running `pycorpora-download`::
 
-    python setup.py install --corpora-zip-url=https://github.com/dariusk/corpora/archive/master.zip
-
-... or, with ``pip``::
-
-    pip install pycorpora --install-option="--corpora-zip-url=https://github.com/dariusk/corpora/archive/master.zip"
+    pycorpora-download --corpora-zip-url=https://github.com/dariusk/corpora/archive/master.zip
 
 (The intention of ``--corpora-zip-url`` is to let you install Corpora Project
 data from a particular branch, commit or fork, so that changes to the bleeding
@@ -55,9 +53,9 @@ edge of the project don't break your code.)
 Update
 ------
 
-Update Corpora Project data by reinstalling with pip::
+Update Corpora Project data by running the `pycorpora-download` script again::
 
-    pip install --upgrade --force-reinstall pycorpora
+    pycorpora-download
 
 Usage
 -----

pycorpora/downloader.py

@@ -0,0 +1,41 @@
+import argparse
+from distutils.dir_util import mkpath, copy_tree
+import glob
+import io
+import sys
+import zipfile
+try:
+    # For Python 3.0 and later
+    from urllib.request import urlopen
+except ImportError:
+    # Fall back to Python 2's urllib2
+    from urllib2 import urlopen
+
+def main():
+
+    DEFAULT_ZIP = "https://github.com/dariusk/corpora/archive/master.zip"
+
+    parser = argparse.ArgumentParser(description="Install corpora data.")
+    parser.add_argument(
+        "--corpora-zip-url",
+        help='URL pointing to .zip file of corpora data (defaults to current master on GitHub)',
+        default=DEFAULT_ZIP
+    )
+    parsed = parser.parse_args()
+
+    url = parsed.corpora_zip_url
+    print("Installing corpora data from " + url)
+    mkpath("./corpora-download")
+    resp = urlopen(url).read()
+    remote = io.BytesIO(resp)
+    zf = zipfile.ZipFile(remote, "r")
+    zf.extractall("corpora-download")
+    try:
+        data_dir = glob.glob("./corpora-download/*/data")[0]
+    except IndexError:
+        raise IndexError(
+            "malformed corpora archive: expecting a subdirectory '*/data'")
+    copy_tree(data_dir, "pycorpora/data")
+
+if __name__ == '__main__':
+    main()

setup.py

@@ -5,48 +5,11 @@
 except ImportError:
     from distutils.core import setup
     from distutils.command.install import install
-try:
-    # For Python 3.0 and later
-    from urllib.request import urlopen
-except ImportError:
-    # Fall back to Python 2's urllib2
-    from urllib2 import urlopen
-from distutils.dir_util import mkpath, copy_tree
 import glob
 import io
 import zipfile
 
 
-class DownloadAndInstall(install):
-    user_options = install.user_options + [
-            ('corpora-zip-url=', None,
-                'URL pointing to .zip file of corpora data ' +
-                '(defaults to current master on GitHub)')
-            ]
-
-    def initialize_options(self, *args, **kwargs):
-        install.initialize_options(self, *args, **kwargs)
-        self.corpora_zip_url = None
-
-    def run(self):
-        if self.corpora_zip_url is None:
-            self.corpora_zip_url = \
-                "https://github.com/dariusk/corpora/archive/master.zip"
-        print("Installing corpora data from " + self.corpora_zip_url)
-        mkpath("./corpora-download")
-        resp = urlopen(self.corpora_zip_url).read()
-        remote = io.BytesIO(resp)
-        zf = zipfile.ZipFile(remote, "r")
-        zf.extractall("corpora-download")
-        try:
-            data_dir = glob.glob("./corpora-download/*/data")[0]
-        except IndexError:
-            raise IndexError(
-                "malformed corpora archive: expecting a subdirectory '*/data'")
-        copy_tree(data_dir, "pycorpora/data")
-        install.run(self)
-
-
 setup(
     name="pycorpora",
     version="0.1.2",
@@ -59,6 +22,11 @@ def run(self):
     license="LICENSE.txt",
     long_description=open("README.rst").read(),
     keywords="nlp corpus text language",
+    entry_points = {
+        'console_scripts': [
+            "pycorpora-download = pycorpora.downloader:main"
+        ]
+    },
     classifiers=[
         "Development Status :: 3 - Alpha",
         "Intended Audience :: Developers",
@@ -79,5 +47,4 @@ def run(self):
         "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Artistic Software",
         "Topic :: Scientific/Engineering :: Artificial Intelligence"],
-    cmdclass={'install': DownloadAndInstall},
 )