Fix compatibility with tox>=4

setup.py

@@ -68,7 +68,7 @@ def default_environment():
     entry_points={
         'tox': ['travis = tox_travis.hooks'],
     },
-    install_requires=['tox>=2.0,<4'],
+    install_requires=['tox>=2.0'],
     python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
     classifiers=[
         'Development Status :: 4 - Beta',

src/tox_travis/after.py

@@ -5,7 +5,7 @@
 import json
 import time
 
-from tox.config import _split_env as split_env
+from .v4_workarounds import _split_env as split_env
 try:
     import urllib.request as urllib2
 except ImportError:

src/tox_travis/envlist.py

@@ -4,12 +4,14 @@
 import os
 import re
 import sys
-from itertools import product
+import itertools
 
 import tox.config
-from tox.config import _split_env as split_env
 
 from .utils import TRAVIS_FACTORS, parse_dict
+from .v4_workarounds import _split_env as split_env
+
+
 
 def detect_envlist(ini):
     """Default envlist automatically based on the Travis environment."""
@@ -20,7 +22,7 @@ def detect_envlist(ini):
     desired_factors = get_desired_factors(ini)
 
     # Reduce desired factors
-    desired_envs = ['-'.join(env) for env in product(*desired_factors)]
+    desired_envs = ['-'.join(env) for env in itertools.product(*desired_factors)]
 
     # Find matching envs
     return match_envs(declared_envs, desired_envs,

src/tox_travis/hooks.py

@@ -3,6 +3,7 @@
 import os
 import sys
 import tox
+from tox.plugin import impl
 from .envlist import (
     detect_envlist,
     autogen_envconfigs,
@@ -15,8 +16,8 @@
 from .after import travis_after
 
 
-@tox.hookimpl
-def tox_addoption(parser):
+@impl
+def tox_add_option(parser):
     """Add arguments and needed monkeypatches."""
     parser.add_argument(
         '--travis-after', dest='travis_after', action='store_true',
@@ -27,12 +28,13 @@ def tox_addoption(parser):
         subcommand_test_monkeypatch(tox_subcommand_test_post)
 
 
-@tox.hookimpl
-def tox_configure(config):
+@impl
+def tox_add_env_config(env_conf, state):
     """Check for the presence of the added options."""
     if 'TRAVIS' not in os.environ:
         return
 
+    config = env_conf
     ini = config._cfg
 
     # envlist

src/tox_travis/v4_workarounds.py

@@ -0,0 +1,32 @@
+import itertools
+import re
+
+_ENVSTR_SPLIT_PATTERN = re.compile(r"((?:{[^}]+})+)|,")
+_ENVSTR_EXPAND_PATTERN = re.compile(r"{([^}]+)}")
+_WHITESPACE_PATTERN = re.compile(r"\s+")
+
+def mapcat(f, seq):
+    return list(itertools.chain.from_iterable(map(f, seq)))
+
+
+def _expand_envstr(envstr):
+    # split by commas not in groups
+    tokens = _ENVSTR_SPLIT_PATTERN.split(envstr)
+    envlist = ["".join(g).strip() for k, g in itertools.groupby(tokens, key=bool) if k]
+
+    def expand(env):
+        tokens = _ENVSTR_EXPAND_PATTERN.split(env)
+        parts = [_WHITESPACE_PATTERN.sub("", token).split(",") for token in tokens]
+        return ["".join(variant) for variant in itertools.product(*parts)]
+
+    return mapcat(expand, envlist)
+
+def _split_env(env):
+    """if handed a list, action="append" was used for -e"""
+    if env is None:
+        return []
+    if not isinstance(env, list):
+        env = [e.split("#", 1)[0].strip() for e in env.split("\n")]
+        env = ",".join(e for e in env if e)
+        env = [env]
+    return mapcat(_expand_envstr, env)