release/0.7.2: Add separated loading of package information

setup.py

@@ -3,7 +3,52 @@
 from setuptools import setup
 from setuptools import find_packages
 
-from sklearn_porter import meta  # see sklearn_porter/package.json
+from os.path import abspath
+from os.path import dirname
+from os.path import exists
+from os.path import join
+from json import load
+
+
+def _load_meta(path):
+    """
+    Load meta data about this package from file package.json.
+    :param path: The path to package.json
+    :return: Dictionary of key value pairs.
+    """
+    with open(path) as f:
+        meta = load(f, encoding='utf-8')
+        meta = {k: v.decode('utf-8') if isinstance(v, bytes) else v
+                for k, v in meta.items()}
+
+        src_dir = abspath(dirname(path))
+
+        if 'requirements' in meta and \
+                str(meta['requirements']).startswith('file://'):
+            req_path = str(meta['requirements'])[7:]
+            req_path = join(src_dir, req_path)
+            if exists(req_path):
+                reqs = open(req_path, 'r').read().strip().split('\n')
+                reqs = [req.strip() for req in reqs if 'git+' not in req]
+                meta['requirements'] = reqs
+            else:
+                meta['requirements'] = ''
+
+        if 'long_description' in meta and \
+                str(meta['long_description']).startswith('file://'):
+            readme_path = str(meta['long_description'])[7:]
+            readme_path = join(src_dir, readme_path)
+            if exists(readme_path):
+                readme = open(readme_path, 'r').read().strip()
+                meta['long_description'] = readme
+            else:
+                meta['long_description'] = ''
+
+    return meta
+
+
+package = join(abspath(dirname(__file__)), 'sklearn_porter', 'package.json')
+meta = _load_meta(package)
 
 
 setup(