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+#! /usr/bin/env python
+# encoding: utf-8
+# Calle Rosenquist, 2016-2018 (xbreak)
+
+"""
+Provides Python unit test support using :py:class:`waflib.Tools.waf_unit_test.utest`
+task via the **pytest** feature.
+
+To use pytest the following is needed:
+
+1. Load `pytest` and the dependency `waf_unit_test` tools.
+2. Create a task generator with feature `pytest` (not `test`) and customize behaviour with
+   the following attributes:
+
+   - `pytest_source`: Test input files.
+   - `ut_str`: Test runner command, e.g. ``${PYTHON} -B -m unittest discover`` or
+               if nose is used: ``${NOSETESTS} --no-byte-compile ${SRC}``.
+   - `ut_shell`: Determines if ``ut_str`` is executed in a shell. Default: False.
+   - `ut_cwd`: Working directory for test runner. Defaults to directory of
+               first ``pytest_source`` file.
+
+   Additionally the following `pytest` specific attributes are used in dependent taskgens:
+
+   - `pytest_path`: Node or string list of additional Python paths.
+   - `pytest_libpath`: Node or string list of additional library paths.
+
+The `use` dependencies are used for both update calculation and to populate
+the following environment variables for the `pytest` test runner:
+
+1. `PYTHONPATH` (`sys.path`) of any dependent taskgen that has the feature `py`:
+
+   - `install_from` attribute is used to determine where the root of the Python sources
+      are located. If `install_from` is not specified the default is to use the taskgen path
+      as the root.
+
+   - `pytest_path` attribute is used to manually specify additional Python paths.
+
+2. Dynamic linker search path variable (e.g. `LD_LIBRARY_PATH`) of any dependent taskgen with
+   non-static link_task.
+
+   - `pytest_libpath` attribute is used to manually specify additional linker paths.
+
+Note: `pytest` cannot automatically determine the correct `PYTHONPATH` for `pyext` taskgens
+      because the extension might be part of a Python package or used standalone:
+
+      - When used as part of another `py` package, the `PYTHONPATH` is provided by
+      that taskgen so no additional action is required.
+
+      - When used as a standalone module, the user needs to specify the `PYTHONPATH` explicitly
+      via the `pytest_path` attribute on the `pyext` taskgen.
+
+      For details c.f. the pytest playground examples.
+
+
+For example::
+
+    # A standalone Python C extension that demonstrates unit test environment population
+    # of PYTHONPATH and LD_LIBRARY_PATH/PATH/DYLD_LIBRARY_PATH.
+    #
+    # Note: `pytest_path` is provided here because pytest cannot automatically determine
+    # if the extension is part of another Python package or is used standalone.
+    bld(name         = 'foo_ext',
+        features     = 'c cshlib pyext',
+        source       = 'src/foo_ext.c',
+        target       = 'foo_ext',
+        pytest_path  = [ bld.path.get_bld() ])
+
+    # Python package under test that also depend on the Python module `foo_ext`
+    #
+    # Note: `install_from` is added automatically to `PYTHONPATH`.
+    bld(name         = 'foo',
+        features     = 'py',
+        use          = 'foo_ext',
+        source       = bld.path.ant_glob('src/foo/*.py'),
+        install_from = 'src')
+
+    # Unit test example using the built in module unittest and let that discover
+    # any test cases.
+    bld(name          = 'foo_test',
+        features      = 'pytest',
+        use           = 'foo',
+        pytest_source = bld.path.ant_glob('test/*.py'),
+        ut_str        = '${PYTHON} -B -m unittest discover')
+
+"""
+
+import os
+from waflib import Task, TaskGen, Errors, Utils, Logs
+from waflib.Tools import ccroot
+
+def _process_use_rec(self, name):
+	"""
+	Recursively process ``use`` for task generator with name ``name``..
+	Used by pytest_process_use.
+	"""
+	if name in self.pytest_use_not or name in self.pytest_use_seen:
+		return
+	try:
+		tg = self.bld.get_tgen_by_name(name)
+	except Errors.WafError:
+		self.pytest_use_not.add(name)
+		return
+
+	self.pytest_use_seen.append(name)
+	tg.post()
+
+	for n in self.to_list(getattr(tg, 'use', [])):
+		_process_use_rec(self, n)
+
+
+@TaskGen.feature('pytest')
+@TaskGen.after_method('process_source', 'apply_link')
+def pytest_process_use(self):
+	"""
+	Process the ``use`` attribute which contains a list of task generator names and store
+	paths that later is used to populate the unit test runtime environment.
+	"""
+	self.pytest_use_not = set()
+	self.pytest_use_seen = []
+	self.pytest_paths = [] # strings or Nodes
+	self.pytest_libpaths = [] # strings or Nodes
+	self.pytest_dep_nodes = []
+
+	names = self.to_list(getattr(self, 'use', []))
+	for name in names:
+		_process_use_rec(self, name)
+	
+	def extend_unique(lst, varlst):
+		ext = []
+		for x in varlst:
+			if x not in lst:
+				ext.append(x)
+		lst.extend(ext)
+
+	# Collect type specific info needed to construct a valid runtime environment
+	# for the test.
+	for name in self.pytest_use_seen:
+		tg = self.bld.get_tgen_by_name(name)
+
+		extend_unique(self.pytest_paths, Utils.to_list(getattr(tg, 'pytest_path', [])))
+		extend_unique(self.pytest_libpaths, Utils.to_list(getattr(tg, 'pytest_libpath', [])))
+
+		if 'py' in tg.features:
+			# Python dependencies are added to PYTHONPATH
+			pypath = getattr(tg, 'install_from', tg.path)
+
+			if 'buildcopy' in tg.features:
+				# Since buildcopy is used we assume that PYTHONPATH in build should be used,
+				# not source
+				extend_unique(self.pytest_paths, [pypath.get_bld().abspath()])
+
+				# Add buildcopy output nodes to dependencies
+				extend_unique(self.pytest_dep_nodes, [o for task in getattr(tg, 'tasks', []) \
+														for o in getattr(task, 'outputs', [])])
+			else:
+				# If buildcopy is not used, depend on sources instead
+				extend_unique(self.pytest_dep_nodes, tg.source)
+				extend_unique(self.pytest_paths, [pypath.abspath()])
+
+		if getattr(tg, 'link_task', None):
+			# For tasks with a link_task (C, C++, D et.c.) include their library paths:
+			if not isinstance(tg.link_task, ccroot.stlink_task):
+				extend_unique(self.pytest_dep_nodes, tg.link_task.outputs)
+				extend_unique(self.pytest_libpaths, tg.link_task.env.LIBPATH)
+
+				if 'pyext' in tg.features:
+					# If the taskgen is extending Python we also want to add the interpreter libpath.
+					extend_unique(self.pytest_libpaths, tg.link_task.env.LIBPATH_PYEXT)
+				else:
+					# Only add to libpath if the link task is not a Python extension
+					extend_unique(self.pytest_libpaths, [tg.link_task.outputs[0].parent.abspath()])
+
+
+@TaskGen.feature('pytest')
+@TaskGen.after_method('pytest_process_use')
+def make_pytest(self):
+	"""
+	Creates a ``utest`` task with a populated environment for Python if not specified in ``ut_env``:
+
+	- Paths in `pytest_paths` attribute are used to populate PYTHONPATH
+	- Paths in `pytest_libpaths` attribute are used to populate the system library path (e.g. LD_LIBRARY_PATH)
+	"""
+	nodes = self.to_nodes(self.pytest_source)
+	tsk = self.create_task('utest', nodes)
+	
+	tsk.dep_nodes.extend(self.pytest_dep_nodes)
+	if getattr(self, 'ut_str', None):
+		self.ut_run, lst = Task.compile_fun(self.ut_str, shell=getattr(self, 'ut_shell', False))
+		tsk.vars = lst + tsk.vars
+
+	if getattr(self, 'ut_cwd', None):
+		if isinstance(self.ut_cwd, str):
+			# we want a Node instance
+			if os.path.isabs(self.ut_cwd):
+				self.ut_cwd = self.bld.root.make_node(self.ut_cwd)
+			else:
+				self.ut_cwd = self.path.make_node(self.ut_cwd)
+	else:
+		if tsk.inputs:
+			self.ut_cwd = tsk.inputs[0].parent
+		else:
+			raise Errors.WafError("no valid input files for pytest task, check pytest_source value")
+
+	if not self.ut_cwd.exists():
+		self.ut_cwd.mkdir()
+
+	if not hasattr(self, 'ut_env'):
+		self.ut_env = dict(os.environ)
+		def add_paths(var, lst):
+			# Add list of paths to a variable, lst can contain strings or nodes
+			lst = [ str(n) for n in lst ]
+			Logs.debug("ut: %s: Adding paths %s=%s", self, var, lst)
+			self.ut_env[var] = os.pathsep.join(lst) + os.pathsep + self.ut_env.get(var, '')
+
+		# Prepend dependency paths to PYTHONPATH and LD_LIBRARY_PATH
+		add_paths('PYTHONPATH', self.pytest_paths)
+
+		if Utils.is_win32:
+			add_paths('PATH', self.pytest_libpaths)
+		elif Utils.unversioned_sys_platform() == 'darwin':
+			add_paths('DYLD_LIBRARY_PATH', self.pytest_libpaths)
+			add_paths('LD_LIBRARY_PATH', self.pytest_libpaths)
+		else:
+			add_paths('LD_LIBRARY_PATH', self.pytest_libpaths)
+