#!/usr/bin/env python
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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

"""
Check which python executable is running scons and which python executable
would be used by scons, when we run under an unactivated virtualenv (i.e. PATH
does not contain virtualenv's bin path). This test is skipped if ran in
a regular environment or in an activated virtualenv.
"""

import TestSCons
import SCons.Platform.virtualenv
import os
import re

test = TestSCons.TestSCons()

if not SCons.Platform.virtualenv.Virtualenv():
    test.skip_test("No virtualenv detected, skipping\n")

if SCons.Platform.virtualenv.select_paths_in_venv(os.getenv('PATH')):
    test.skip_test("Virtualenv detected and it looks like activated, skipping\n")

test.write('SConstruct', """
import sys
env = DefaultEnvironment(tools=[])
print("sys.executable: %s" % repr(sys.executable))
print("env.WhereIs('python'): %s" % repr(env.WhereIs('python')))
""")

if SCons.Platform.virtualenv.virtualenv_enabled_by_default:
    test.run(['-Q'])
else:
    test.run(['-Q', '--enable-virtualenv'])

s = test.stdout()
m = re.search(r"""^sys\.executable:\s*(?P<py>["']?[^\"']+["']?)\s*$""", s, re.MULTILINE)
if not m:
    test.fail_test(message="""\
can't determine sys.executable from stdout:
========= STDOUT =========
%s
==========================
""" % s)

interpreter = eval(m.group('py'))

m = re.search(r"""^\s*env\.WhereIs\('python'\):\s*(?P<py>["']?[^"']+[\"']?)\s*$""", s, re.MULTILINE)
if not m:
    test.fail_test(message="""
can't determine env.WhereIs('python') from stdout:
========= STDOUT =========
%s
==========================
""" % s)

python = eval(m.group('py'))

# running without activating virtualenv (by just /path/to/virtualenv/bin/python runtest.py ...).
test.fail_test(not SCons.Platform.virtualenv.IsInVirtualenv(interpreter),
               message="sys.executable points outside of virtualenv")
test.fail_test(SCons.Platform.virtualenv.IsInVirtualenv(python),
               message="env.WhereIs('python') points to virtualenv")

test.pass_test()

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