Improve setup.py metadata (#60)

Signed-off-by: Thomas Moulard <[email protected]>

setup.py

@@ -15,7 +15,9 @@
 
 """Package setup for cross_compile."""
 
+import errno
 import os
+from os import path
 
 from xml.etree import ElementTree
 
@@ -25,22 +27,63 @@
 package_name = 'cross_compile'
 
 
+def build_package_directory_path():
+    """
+    Return the directory containing the package code, following symbolic links.
+
+    When compiling this package with colcon, users can optionally pass
+    a --symlink-install flag which will create a symlink of setup.py into
+    <prefix>/build/<pkg>.
+    Using this function, a path will be returned containing not only setup.py,
+    and some subset of files for which a symlink exists, but the original
+    package directory.
+    """
+    try:
+        return os.path.dirname(os.readlink(__file__))
+    except OSError as os_error:
+        if os_error.errno == errno.EINVAL:
+            return os.path.dirname(__file__)
+
+
 def read_version_from_package_xml():
     tree = ElementTree.parse('package.xml')
     version = tree.find('version')
     return version.text
 
 
+this_directory = build_package_directory_path()
+with open(path.join(this_directory, 'README.md'), encoding='utf-8') as f:
+    long_description = f.read()
+
 setup(
     name=package_name,
     version=read_version_from_package_xml(),
     packages=find_packages(exclude=['test']),
-    maintainer='AWS RoboMaker',
-    maintainer_email='[email protected]',
-    url='https://github.com/ros2/cross_compile',
+    author='ROS Tooling Working Group',
+    author_email='[email protected]',
+    maintainer='ROS Tooling Working Group',
+    maintainer_email='[email protected]',
+    url='https://github.com/ros-tooling/cross_compile',
+    download_url='https://github.com/ros-tooling/cross_compile/releases',
+    keywords=['ROS'],
+    classifiers=[
+        'Development Status :: 4 - Beta',
+        'Environment :: Console',
+        'Intended Audience :: Developers',
+        'License :: OSI Approved :: Apache Software License',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Topic :: Software Development',
+    ],
+    description='A tool to cross-compile ROS 2 packages.',
+    long_description=long_description,
+    long_description_content_type='text/markdown',
+    license='Apache License, Version 2.0',
     data_files=[
-        ('share/' + package_name, ['package.xml']),
-        ('share/ament_index/resource_index/packages', [os.path.join('resource', package_name)]),
+        (os.path.join('share', package_name), ['package.xml']),
+        ('share/ament_index/resource_index/packages',
+         [os.path.join('resource', package_name)]),
     ],
     package_data={
         package_name: ['Dockerfile_workspace']
@@ -50,8 +93,6 @@ def read_version_from_package_xml():
         'docker',
     ],
     zip_safe=True,
-    description='A cross compilation tool for ROS 2 packages.',
-    license='Apache License, Version 2.0',
     tests_require=[
         'pytest',
         'flake8'
@@ -60,5 +101,6 @@ def read_version_from_package_xml():
         'console_scripts': [
             'cross_compile = cross_compile.ros2_cross_compile:main'
         ]
-    }
+    },
+    python_requires='>=3.5',
 )