component/{numpy,scipy}: Version up for Python3.9

Introduce macro.pythonpath.egg to compute during install the PYTHONPATH
of setup eggs required to install other eggs, and insert the PYTHONPATH
into the environment section such as used by zc.recipe.egg:custom.

Both numpy and scipy use a Python subprocess to call Cython in their
setup.py, therefore the setup-eggs option of zc.recipe.egg:custom
does not work because sys.path is not propagated to the subprocess.

component/macros/macro.pythonpath.eggs.cfg

+[buildout]
+parts =
+
+[macro.pythonpath.eggs]
+recipe = slapos.recipe.build
+_name_ = ${:_buildout_section_name_}
+init =
+  prerequisite = """
+  [.%(_name_)s.prerequisite]
+  recipe = slapos.recipe.build
+  init =
+    section = self.buildout['%(_name_)s']
+    self.eggs = [e.strip() for e in section['eggs'].splitlines() if e.strip()]
+  update =
+    from zc.buildout.easy_install import working_set
+    buildout = self.buildout['buildout']
+    eggs_directory = buildout['eggs-directory']
+    develop_eggs_directory = buildout['develop-eggs-directory']
+    dists = working_set(self.eggs, [develop_eggs_directory, eggs_directory])
+    paths = ':'.join(dist.location for dist in dists)
+    self.buildout['%(environment)s']['PYTHONPATH'] = paths
+    print("PYTHONPATH=" + paths)
+  """ % options
+  self.buildout.parse(prerequisite)

component/numpy/buildout.cfg

 [buildout]
+extends =
+  ../cython/buildout.cfg
+  ../macros/macro.pythonpath.eggs.cfg
 parts = numpy
 
+[numpy-env]
+BLAS=None
+LAPACK=None
+ATLAS=None
+
 [numpy]
 recipe = zc.recipe.egg:custom
 egg = numpy
-
+environment = numpy-env
 
 [versions]
 numpy = 1.16.4
+
+[numpy:sys.version_info >= (3,8)]
+depends = ${numpy-pythonpath:recipe}
+
+[numpy-pythonpath]
+<= macro.pythonpath.eggs
+environment = numpy-env
+eggs = ${cython:egg}
+
+[versions:sys.version_info >= (3,8)]
+numpy = 1.22.0

component/numpy/openblas.cfg

@@ -2,6 +2,7 @@
 extends =
   buildout.cfg
   ../openblas/buildout.cfg
+parts = numpy
 
 [numpy-env]
 OPENBLAS = ${openblas:location}/lib/libopenblas.so
@@ -10,5 +11,4 @@ ATLAS = ${openblas:location}/lib/libopenblas.so
 
 [numpy]
 environment = numpy-env
-rpath =
-  ${openblas:location}/lib
+rpath = ${openblas:location}/lib

component/pandas/buildout.cfg

 [buildout]
 extends =
+  ../cython/buildout.cfg
   ../numpy/buildout.cfg
 
 parts =
@@ -12,4 +13,15 @@ parts =
 recipe = zc.recipe.egg:custom
 egg = pandas
 environment = pandas-env
-setup-eggs = ${numpy:egg}
+setup-eggs =
+  ${numpy:egg}
+
+[pandas:sys.version_info >= (3,8)]
+setup-eggs +=
+  ${cython:egg}
+
+[versions]
+pandas = 0.25.3
+
+[versions:sys.version_info >= (3,8)]
+pandas = 1.4.0

component/scipy/buildout.cfg

 [buildout]
 extends =
   ../numpy/openblas.cfg
-
-parts =
-  scipy
+  ../pandas/buildout.cfg
+parts = scipy
 
 [scipy-env]
 <= numpy-env
@@ -14,3 +13,31 @@ egg = scipy
 environment = scipy-env
 setup-eggs = ${numpy:egg}
 rpath = ${numpy:rpath}
+
+[versions]
+scipy = 1.0.1
+
+[scipy:sys.version_info >= (3,8)]
+depends = ${scipy-pythonpath:recipe}
+
+[scipy-pythonpath]
+<= macro.pythonpath.eggs
+environment = scipy-env
+eggs = ${scipy-setup-eggs:eggs}
+
+[scipy-setup-eggs]
+recipe = zc.recipe.egg
+eggs =
+  ${cython:egg}
+  ${numpy:egg}
+  ${pandas:egg}
+  pythran
+  pybind11
+
+[versions:sys.version_info >= (3,8)]
+pybind11 = 2.9.2
+scipy = 1.8.1
+beniget = 0.4.1
+gast = 0.5.3
+ply = 3.11
+pythran = 0.11.0:whl