🚑 choose version of ruamel.yaml

Re-adds Python 3.4 support, broken by ruamel.yaml desupporting it
in version 0.15.94.
Also adds minimum version for ruamel-yaml on Python 3.7 and 3.8-dev.
And avoids newer arrow desupported on Python 3.4.

Fixes #274

Author: jayvdb

.moban.cd/moban.yml

@@ -18,7 +18,10 @@ keywords:
   - jinja2
   - moban
 dependencies:
-  - ruamel.yaml>=0.15.5
+  - ruamel.yaml>=0.15.5,<=0.15.94;python_version == '3.4'
+  - ruamel.yaml>=0.15.42;python_version == '3.7'
+  - ruamel.yaml>=0.15.97;python_version == '3.8'
+  - ruamel.yaml>=0.15.5;python_version != '3.4' and python_version < '3.7'
   - jinja2>=2.7.1
   - lml>=0.0.9
   - appdirs>=1.2.0
@@ -28,3 +31,5 @@ dependencies:
 description: Yet another jinja2 cli command for static text generation
 scm_host: github.com
 lint_command: make lint install_test format install update
+setup_use_markers: true
+setup_use_markers_fix: true

.moban.d/travis.yml

@@ -1,10 +1,9 @@
 {% extends 'travis.yml.jj2' %}
 
 {%block extra_matrix %}
-matrix:
-  include:
-    - python: 2.7
-      env: MINREQ=1
+env:
+  - MINREQ=0
+  - MINREQ=1
 {%endblock%}
 
 {%block custom_python_versions%}
@@ -14,5 +13,6 @@ python:
   - 3.7
   - 3.6
   - 3.5
+  - 3.4
   - 2.7
 {%endblock%}

.travis.yml

@@ -10,11 +10,11 @@ python:
   - 3.7
   - 3.6
   - 3.5
+  - 3.4
   - 2.7
-matrix:
-  include:
-    - python: 2.7
-      env: MINREQ=1
+env:
+  - MINREQ=0
+  - MINREQ=1
 
 stages:
   - test

min_requirements.txt

@@ -1,4 +1,7 @@
-ruamel.yaml==0.15.5
+ruamel.yaml==0.15.5,<=0.15.94;python_version == '3.4'
+ruamel.yaml==0.15.42;python_version == '3.7'
+ruamel.yaml==0.15.97;python_version == '3.8'
+ruamel.yaml==0.15.5;python_version != '3.4' and python_version < '3.7'
 jinja2==2.7.1
 lml==0.0.9
 appdirs==1.2.0

mobanfile

@@ -1,8 +1,10 @@
-requires:
-   - pypi-mobans-pkg
+#requires:
+#  - type: git
+#    url: https://github.com/jayvdb/pypi-mobans
+#    branch: setup-env-markers
 configuration:
   template_dir:
-    - "setupmobans:templates"
+    - "../pypi-mobans/templates"
     - ".moban.d"
   configuration: moban.yml
 targets:

requirements.txt

@@ -1,4 +1,7 @@
-ruamel.yaml>=0.15.5
+ruamel.yaml>=0.15.5,<=0.15.94;python_version == '3.4'
+ruamel.yaml>=0.15.42;python_version == '3.7'
+ruamel.yaml>=0.15.97;python_version == '3.8'
+ruamel.yaml>=0.15.5;python_version != '3.4' and python_version < '3.7'
 jinja2>=2.7.1
 lml>=0.0.9
 appdirs>=1.2.0

setup.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-
 # Template by pypi-mobans
 import codecs
 import locale
@@ -9,6 +8,15 @@
 from shutil import rmtree
 
 from setuptools import Command, find_packages, setup
+from setuptools import __version__ as setuptools_version
+from pkg_resources import parse_version
+
+import pkg_resources
+
+try:
+    import _markerlib.markers
+except ImportError:
+    _markerlib = None
 
 PY2 = sys.version_info[0] == 2
 PY26 = PY2 and sys.version_info[1] < 7
@@ -67,7 +75,6 @@
 ]
 
 INSTALL_REQUIRES = [
-    "ruamel.yaml>=0.15.5",
     "jinja2>=2.7.1",
     "lml>=0.0.9",
     "appdirs>=1.2.0",
@@ -80,6 +87,10 @@
 
 PACKAGES = find_packages(exclude=["ez_setup", "examples", "tests"])
 EXTRAS_REQUIRE = {
+    ":python_version == '3.4'": ["ruamel.yaml>=0.15.5,<=0.15.94"],
+    ":python_version == '3.7'": ["ruamel.yaml>=0.15.42"],
+    ":python_version == '3.8'": ["ruamel.yaml>=0.15.97"],
+    ":python_version != '3.4' and python_version < '3.7'": ["ruamel.yaml>=0.15.5"],
 }
 # You do not need to read beyond this line
 PUBLISH_COMMAND = "{0} setup.py sdist bdist_wheel upload -r pypi".format(sys.executable)
@@ -191,6 +202,47 @@ def filter_out_test_code(file_handle):
                 yield line
 
 
+# _markerlib.default_environment() obtains its data from _VARS
+# and wraps it in another dict, but _markerlib_evaluate writes
+# to the dict while it is iterating the keys, causing an error
+# on Python 3 only.
+# Replace _markerlib.default_environment to return a custom dict
+# that has all the necessary markers, and ignores any writes.
+
+class Python3MarkerDict(dict):
+
+    def __setitem__(self, key, value):
+        pass
+
+    def pop(self, i=-1):
+        return self[i]
+
+
+if _markerlib and sys.version_info[0] == 3:
+    env = _markerlib.markers._VARS
+    for key in list(env.keys()):
+        new_key = key.replace(".", "_")
+        if new_key != key:
+            env[new_key] = env[key]
+
+    _markerlib.markers._VARS = Python3MarkerDict(env)
+
+    def default_environment():
+        return _markerlib.markers._VARS
+
+    _markerlib.default_environment = default_environment
+
+# Avoid the very buggy pkg_resources.parser, which does not consistently
+# recognise the markers needed by this setup.py
+# Change this to setuptools 20.10.0 to support all markers.
+if pkg_resources:
+    if parse_version(setuptools_version) < parse_version("18.5"):
+        MarkerEvaluation = pkg_resources.MarkerEvaluation
+
+        del pkg_resources.parser
+        pkg_resources.evaluate_marker = MarkerEvaluation._markerlib_evaluate
+        MarkerEvaluation.evaluate_marker = MarkerEvaluation._markerlib_evaluate
+
 if __name__ == "__main__":
     setup(
         test_suite="tests",

tests/requirements.txt

@@ -7,4 +7,7 @@ black;python_version>="3.6"
 isort;python_version>="3.6"
 moban-handlebars
 pypi-mobans-pkg
+# arrow 0.14.0 doesnt support Python 3.4
+arrow<0.14.0;python_version=="3.4"
+arrow;python_version!="3.4"
 jinja2_time