Pip10 update

.appveyor.yml

@@ -1,10 +1,46 @@
 environment:
 
     matrix:
-        - TOXENV: py27
-        - TOXENV: py34
-        - TOXENV: py35
-        - TOXENV: py36
+        - TOXENV: py27-pip8.1.1
+          PIP: 8.1.1
+        - TOXENV: py27-pip9.0.1
+          PIP: 9.0.1
+        - TOXENV: py27-pip9.0.3
+          PIP: 9.0.3
+        - TOXENV: py27-pipmaster
+          PIP: master
+        - TOXENV: py27-piplatest
+          PIP: latest
+        - TOXENV: py34-pip8.1.1
+          PIP: 8.1.1
+        - TOXENV: py34-pip9.0.1
+          PIP: 9.0.1
+        - TOXENV: py34-pip9.0.3
+          PIP: 9.0.3
+        - TOXENV: py34-pipmaster
+          PIP: master
+        - TOXENV: py34-piplatest
+          PIP: latest
+        - TOXENV: py35-pip8.1.1
+          PIP: 8.1.1
+        - TOXENV: py35-pip9.0.1
+          PIP: 9.0.1
+        - TOXENV: py35-pip9.0.3
+          PIP: 9.0.3
+        - TOXENV: py35-pipmaster
+          PIP: master
+        - TOXENV: py35-piplatest
+          PIP: latest
+        - TOXENV: py36-pip8.1.1
+          PIP: 8.1.1
+        - TOXENV: py36-pip9.0.1
+          PIP: 9.0.1
+        - TOXENV: py36-pip9.0.3
+          PIP: 9.0.3
+        - TOXENV: py36-pipmaster
+          PIP: master
+        - TOXENV: py36-piplatest
+          PIP: latest
 
 install:
     - C:\Python36\python -m pip install tox

.travis.yml

@@ -7,6 +7,13 @@ python:
   - "3.6"
   - "pypy"
 
+env:
+  - PIP=8.1.1
+  - PIP=9.0.1
+  - PIP=9.0.3
+  - PIP=master
+  - PIP=latest
+
 cache: pip
 install:
   - travis_retry pip install tox-travis

piptools/__init__.py

@@ -1,6 +0,0 @@
-import os
-import sys
-
-# Inject vendored directory into system path.
-v_path = os.path.abspath(os.path.sep.join([os.path.dirname(os.path.realpath(__file__)), '_vendored']))
-sys.path.insert(0, v_path)

piptools/_compat/__init__.py

@@ -11,3 +11,20 @@
 else:
     from tempfile import TemporaryDirectory
     from contextlib import ExitStack
+
+from .pip_compat import (
+    InstallRequirement,
+    parse_requirements,
+    RequirementSet,
+    user_cache_dir,
+    FAVORITE_HASH,
+    is_file_url,
+    url_to_path,
+    PackageFinder,
+    FormatControl,
+    Wheel,
+    Command,
+    cmdoptions,
+    get_installed_distributions,
+    PyPI,
+)

piptools/_compat/pip_compat.py

@@ -0,0 +1,30 @@
+# -*- coding=utf-8 -*-
+import importlib
+
+def do_import(module_path, subimport=None, old_path=None):
+    internal = 'pip._internal.{0}'.format(module_path)
+    old_path = old_path or module_path
+    pip9 = 'pip.{0}'.format(old_path)
+    try:
+        _tmp = importlib.import_module(internal)
+    except ImportError:
+        _tmp = importlib.import_module(pip9)
+    if subimport:
+        return getattr(_tmp, subimport, _tmp)
+    return _tmp
+
+
+InstallRequirement = do_import('req.req_install', 'InstallRequirement')
+parse_requirements = do_import('req.req_file', 'parse_requirements')
+RequirementSet = do_import('req.req_set', 'RequirementSet')
+user_cache_dir = do_import('utils.appdirs', 'user_cache_dir')
+FAVORITE_HASH = do_import('utils.hashes', 'FAVORITE_HASH')
+is_file_url = do_import('download', 'is_file_url')
+url_to_path = do_import('download', 'url_to_path')
+PackageFinder = do_import('index', 'PackageFinder')
+FormatControl = do_import('index', 'FormatControl')
+Wheel = do_import('wheel', 'Wheel')
+Command = do_import('basecommand', 'Command')
+cmdoptions = do_import('cmdoptions')
+get_installed_distributions = do_import('utils.misc', 'get_installed_distributions', old_path='utils')
+PyPI = do_import('models.index', 'PyPI')