setup: synced with rhodecode tools with better compatability on pip versions

setup.py

@@ -22,22 +22,49 @@
 from setuptools import setup, find_packages
 
 import os
+import re
 import sys
 import pkgutil
 import platform
 import codecs
 
-try:  # for pip >= 10
-    from pip._internal.req import parse_requirements
-except ImportError:  # for pip <= 9.0.3
-    from pip.req import parse_requirements
+import pip
 
-try:  # for pip >= 10
+pip_major_version = int(pip.__version__.split(".")[0])
+if pip_major_version >= 20:
+    from pip._internal.req import parse_requirements
+    from pip._internal.network.session import PipSession
+elif pip_major_version >= 10:
+    from pip._internal.req import parse_requirements
     from pip._internal.download import PipSession
-except ImportError:  # for pip <= 9.0.3
+else:
+    from pip.req import parse_requirements
     from pip.download import PipSession
 
 
+def get_package_name(req_object):
+    package_name = None
+    try:
+        from pip._internal.req.constructors import install_req_from_parsed_requirement
+    except ImportError:
+        install_req_from_parsed_requirement = None
+
+    # In 20.1 of pip, the requirements object changed
+    if hasattr(req_object, 'req'):
+        package_name = req_object.req.name
+
+    if package_name is None:
+        if install_req_from_parsed_requirement:
+            package = install_req_from_parsed_requirement(req_object)
+            package_name = package.req.name
+
+    if package_name is None:
+        # fallback for older pip
+        package_name = re.split('===|<=|!=|==|>=|~=|<|>', req_object.requirement)[0]
+
+    return package_name
+
+
 if sys.version_info < (2, 7):
     raise Exception('RhodeCode requires Python 2.7 or later')
 
@@ -63,14 +90,15 @@ def _get_requirements(req_filename, exclude=None, extras=None):
         parsed = parse_requirements(os.path.join(here, req_filename))
 
     requirements = []
-    for ir in parsed:
-        if ir.req and ir.name not in exclude:
-            requirements.append(str(ir.req))
+    for int_req in parsed:
+        req_name = get_package_name(int_req)
+        if req_name not in exclude:
+            requirements.append(req_name)
     return requirements + extras
 
 
 # requirements extract
-setup_requirements = ['PasteScript', 'pytest-runner']
+setup_requirements = ['PasteScript']
 install_requirements = _get_requirements(
     'requirements.txt', exclude=['setuptools', 'entrypoints'])
 test_requirements = _get_requirements(