Collect all the nudgy environment checks into coverage.env

1 files changed, 21 insertions, 0 deletions

diff --git a/coverage/env.py b/coverage/env.py
new file mode 100644
index 00000000..85ffa5ff
--- /dev/null
+++ b/coverage/env.py
@@ -0,0 +1,21 @@
+"""Determine facts about the environment."""
+
+import os
+import sys
+
+# Operating systems.
+WINDOWS = sys.platform == "win32"
+LINUX = sys.platform == "linux2"
+
+# Python implementations.
+PYPY = '__pypy__' in sys.builtin_module_names
+
+# Python versions.
+PY2 = sys.version_info < (3, 0)
+PY3 = sys.version_info >= (3, 0)
+
+# Coverage.py specifics.
+# Are we using the C-implemented trace function?
+C_TRACER = os.getenv('COVERAGE_TEST_TRACER', 'c') == 'c'
+# Are we coverage-measuring ourselves?
+METACOV = os.getenv('COVERAGE_COVERAGE', '') != ''