Adopt native-Python code generation convention (#378)

Closes #304

See rationale writeup: https://github.com/pytorch/vision/pull/1321#issuecomment-531033978

.circleci/config.yml

@@ -48,7 +48,7 @@ jobs:
       - checkout
       - run:
           command: |
-            pip install --user --progress-bar off jinja2
+            pip install --user --progress-bar off jinja2 pyyaml
             python .circleci/regenerate.py
             git diff --exit-code || (echo ".circleci/config.yml not in sync with config.yml.in! Run .circleci/regenerate.py to update config"; exit 1)
 
@@ -227,352 +227,350 @@ workflows:
   build:
     jobs:
       - circleci_consistency
-      
       - binary_linux_wheel:
           name: binary_linux_wheel_py2.7
-          python_version: "2.7"
+          python_version: '2.7'
       - binary_linux_wheel:
           name: binary_linux_wheel_py2.7_unicode
-          python_version: "2.7"
-          unicode_abi: "1"
+          python_version: '2.7'
+          unicode_abi: '1'
       - binary_linux_wheel:
           name: binary_linux_wheel_py3.5
-          python_version: "3.5"
+          python_version: '3.5'
       - binary_linux_wheel:
           name: binary_linux_wheel_py3.6
-          python_version: "3.6"
+          python_version: '3.6'
       - binary_linux_wheel:
           name: binary_linux_wheel_py3.7
-          python_version: "3.7"
+          python_version: '3.7'
       - binary_macos_wheel:
           name: binary_macos_wheel_py2.7
-          python_version: "2.7"
+          python_version: '2.7'
       - binary_macos_wheel:
           name: binary_macos_wheel_py2.7_unicode
-          python_version: "2.7"
-          unicode_abi: "1"
+          python_version: '2.7'
+          unicode_abi: '1'
       - binary_macos_wheel:
           name: binary_macos_wheel_py3.5
-          python_version: "3.5"
+          python_version: '3.5'
       - binary_macos_wheel:
           name: binary_macos_wheel_py3.6
-          python_version: "3.6"
+          python_version: '3.6'
       - binary_macos_wheel:
           name: binary_macos_wheel_py3.7
-          python_version: "3.7"
+          python_version: '3.7'
       - binary_linux_conda:
           name: binary_linux_conda_py2.7
-          python_version: "2.7"
+          python_version: '2.7'
       - binary_linux_conda:
           name: binary_linux_conda_py3.5
-          python_version: "3.5"
+          python_version: '3.5'
       - binary_linux_conda:
           name: binary_linux_conda_py3.6
-          python_version: "3.6"
+          python_version: '3.6'
       - binary_linux_conda:
           name: binary_linux_conda_py3.7
-          python_version: "3.7"
+          python_version: '3.7'
       - binary_macos_conda:
           name: binary_macos_conda_py2.7
-          python_version: "2.7"
+          python_version: '2.7'
       - binary_macos_conda:
           name: binary_macos_conda_py3.5
-          python_version: "3.5"
+          python_version: '3.5'
       - binary_macos_conda:
           name: binary_macos_conda_py3.6
-          python_version: "3.6"
+          python_version: '3.6'
       - binary_macos_conda:
           name: binary_macos_conda_py3.7
-          python_version: "3.7"
+          python_version: '3.7'
 
   nightly:
     jobs:
       - circleci_consistency
-      
       - binary_linux_wheel:
-          name: nightly_binary_linux_wheel_py2.7
-          python_version: "2.7"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py2.7
+          python_version: '2.7'
       - binary_wheel_upload:
-          name: nightly_binary_linux_wheel_py2.7_upload
           context: org-member
-          requires:
-            - nightly_binary_linux_wheel_py2.7
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py2.7_upload
+          requires:
+          - nightly_binary_linux_wheel_py2.7
       - binary_linux_wheel:
-          name: nightly_binary_linux_wheel_py2.7_unicode
-          python_version: "2.7"
-          unicode_abi: "1"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py2.7_unicode
+          python_version: '2.7'
+          unicode_abi: '1'
       - binary_wheel_upload:
-          name: nightly_binary_linux_wheel_py2.7_unicode_upload
           context: org-member
-          requires:
-            - nightly_binary_linux_wheel_py2.7_unicode
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py2.7_unicode_upload
+          requires:
+          - nightly_binary_linux_wheel_py2.7_unicode
       - binary_linux_wheel:
-          name: nightly_binary_linux_wheel_py3.5
-          python_version: "3.5"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py3.5
+          python_version: '3.5'
       - binary_wheel_upload:
-          name: nightly_binary_linux_wheel_py3.5_upload
           context: org-member
+          name: nightly_binary_linux_wheel_py3.5_upload
           requires:
-            - nightly_binary_linux_wheel_py3.5
+          - nightly_binary_linux_wheel_py3.5
       - smoke_test_linux_pip:
-          name: nightly_binary_linux_wheel_py3.5_smoke_test_pip
-          python_version: "3.5"
-          requires:
-            - nightly_binary_linux_wheel_py3.5_upload
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py3.5_smoke_test_pip
+          python_version: '3.5'
+          requires:
+          - nightly_binary_linux_wheel_py3.5_upload
       - binary_linux_wheel:
-          name: nightly_binary_linux_wheel_py3.6
-          python_version: "3.6"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py3.6
+          python_version: '3.6'
       - binary_wheel_upload:
-          name: nightly_binary_linux_wheel_py3.6_upload
           context: org-member
+          name: nightly_binary_linux_wheel_py3.6_upload
           requires:
-            - nightly_binary_linux_wheel_py3.6
+          - nightly_binary_linux_wheel_py3.6
       - smoke_test_linux_pip:
-          name: nightly_binary_linux_wheel_py3.6_smoke_test_pip
-          python_version: "3.6"
-          requires:
-            - nightly_binary_linux_wheel_py3.6_upload
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py3.6_smoke_test_pip
+          python_version: '3.6'
+          requires:
+          - nightly_binary_linux_wheel_py3.6_upload
       - binary_linux_wheel:
-          name: nightly_binary_linux_wheel_py3.7
-          python_version: "3.7"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py3.7
+          python_version: '3.7'
       - binary_wheel_upload:
-          name: nightly_binary_linux_wheel_py3.7_upload
           context: org-member
+          name: nightly_binary_linux_wheel_py3.7_upload
           requires:
-            - nightly_binary_linux_wheel_py3.7
+          - nightly_binary_linux_wheel_py3.7
       - smoke_test_linux_pip:
-          name: nightly_binary_linux_wheel_py3.7_smoke_test_pip
-          python_version: "3.7"
-          requires:
-            - nightly_binary_linux_wheel_py3.7_upload
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_wheel_py3.7_smoke_test_pip
+          python_version: '3.7'
+          requires:
+          - nightly_binary_linux_wheel_py3.7_upload
       - binary_macos_wheel:
-          name: nightly_binary_macos_wheel_py2.7
-          python_version: "2.7"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py2.7
+          python_version: '2.7'
       - binary_wheel_upload:
-          name: nightly_binary_macos_wheel_py2.7_upload
           context: org-member
-          requires:
-            - nightly_binary_macos_wheel_py2.7
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py2.7_upload
+          requires:
+          - nightly_binary_macos_wheel_py2.7
       - binary_macos_wheel:
-          name: nightly_binary_macos_wheel_py2.7_unicode
-          python_version: "2.7"
-          unicode_abi: "1"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py2.7_unicode
+          python_version: '2.7'
+          unicode_abi: '1'
       - binary_wheel_upload:
-          name: nightly_binary_macos_wheel_py2.7_unicode_upload
           context: org-member
-          requires:
-            - nightly_binary_macos_wheel_py2.7_unicode
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py2.7_unicode_upload
+          requires:
+          - nightly_binary_macos_wheel_py2.7_unicode
       - binary_macos_wheel:
-          name: nightly_binary_macos_wheel_py3.5
-          python_version: "3.5"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py3.5
+          python_version: '3.5'
       - binary_wheel_upload:
-          name: nightly_binary_macos_wheel_py3.5_upload
           context: org-member
-          requires:
-            - nightly_binary_macos_wheel_py3.5
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py3.5_upload
+          requires:
+          - nightly_binary_macos_wheel_py3.5
       - binary_macos_wheel:
-          name: nightly_binary_macos_wheel_py3.6
-          python_version: "3.6"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py3.6
+          python_version: '3.6'
       - binary_wheel_upload:
-          name: nightly_binary_macos_wheel_py3.6_upload
           context: org-member
-          requires:
-            - nightly_binary_macos_wheel_py3.6
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py3.6_upload
+          requires:
+          - nightly_binary_macos_wheel_py3.6
       - binary_macos_wheel:
-          name: nightly_binary_macos_wheel_py3.7
-          python_version: "3.7"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py3.7
+          python_version: '3.7'
       - binary_wheel_upload:
-          name: nightly_binary_macos_wheel_py3.7_upload
           context: org-member
-          requires:
-            - nightly_binary_macos_wheel_py3.7
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_wheel_py3.7_upload
+          requires:
+          - nightly_binary_macos_wheel_py3.7
       - binary_linux_conda:
-          name: nightly_binary_linux_conda_py2.7
-          python_version: "2.7"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_conda_py2.7
+          python_version: '2.7'
       - binary_conda_upload:
-          name: nightly_binary_linux_conda_py2.7_upload
           context: org-member
-          requires:
-            - nightly_binary_linux_conda_py2.7
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_conda_py2.7_upload
+          requires:
+          - nightly_binary_linux_conda_py2.7
       - binary_linux_conda:
-          name: nightly_binary_linux_conda_py3.5
-          python_version: "3.5"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_conda_py3.5
+          python_version: '3.5'
       - binary_conda_upload:
-          name: nightly_binary_linux_conda_py3.5_upload
           context: org-member
+          name: nightly_binary_linux_conda_py3.5_upload
           requires:
-            - nightly_binary_linux_conda_py3.5
+          - nightly_binary_linux_conda_py3.5
       - smoke_test_linux_conda:
-          name: nightly_binary_linux_conda_py3.5_smoke_test_conda
-          python_version: "3.5"
-          requires:
-            - nightly_binary_linux_conda_py3.5_upload
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_conda_py3.5_smoke_test_conda
+          python_version: '3.5'
+          requires:
+          - nightly_binary_linux_conda_py3.5_upload
       - binary_linux_conda:
-          name: nightly_binary_linux_conda_py3.6
-          python_version: "3.6"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_conda_py3.6
+          python_version: '3.6'
       - binary_conda_upload:
-          name: nightly_binary_linux_conda_py3.6_upload
           context: org-member
+          name: nightly_binary_linux_conda_py3.6_upload
           requires:
-            - nightly_binary_linux_conda_py3.6
+          - nightly_binary_linux_conda_py3.6
       - smoke_test_linux_conda:
-          name: nightly_binary_linux_conda_py3.6_smoke_test_conda
-          python_version: "3.6"
-          requires:
-            - nightly_binary_linux_conda_py3.6_upload
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_conda_py3.6_smoke_test_conda
+          python_version: '3.6'
+          requires:
+          - nightly_binary_linux_conda_py3.6_upload
       - binary_linux_conda:
-          name: nightly_binary_linux_conda_py3.7
-          python_version: "3.7"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_conda_py3.7
+          python_version: '3.7'
       - binary_conda_upload:
-          name: nightly_binary_linux_conda_py3.7_upload
           context: org-member
+          name: nightly_binary_linux_conda_py3.7_upload
           requires:
-            - nightly_binary_linux_conda_py3.7
+          - nightly_binary_linux_conda_py3.7
       - smoke_test_linux_conda:
-          name: nightly_binary_linux_conda_py3.7_smoke_test_conda
-          python_version: "3.7"
-          requires:
-            - nightly_binary_linux_conda_py3.7_upload
           filters:
             branches:
               only: nightly
+          name: nightly_binary_linux_conda_py3.7_smoke_test_conda
+          python_version: '3.7'
+          requires:
+          - nightly_binary_linux_conda_py3.7_upload
       - binary_macos_conda:
-          name: nightly_binary_macos_conda_py2.7
-          python_version: "2.7"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_conda_py2.7
+          python_version: '2.7'
       - binary_conda_upload:
-          name: nightly_binary_macos_conda_py2.7_upload
           context: org-member
-          requires:
-            - nightly_binary_macos_conda_py2.7
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_conda_py2.7_upload
+          requires:
+          - nightly_binary_macos_conda_py2.7
       - binary_macos_conda:
-          name: nightly_binary_macos_conda_py3.5
-          python_version: "3.5"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_conda_py3.5
+          python_version: '3.5'
       - binary_conda_upload:
-          name: nightly_binary_macos_conda_py3.5_upload
           context: org-member
-          requires:
-            - nightly_binary_macos_conda_py3.5
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_conda_py3.5_upload
+          requires:
+          - nightly_binary_macos_conda_py3.5
       - binary_macos_conda:
-          name: nightly_binary_macos_conda_py3.6
-          python_version: "3.6"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_conda_py3.6
+          python_version: '3.6'
       - binary_conda_upload:
-          name: nightly_binary_macos_conda_py3.6_upload
           context: org-member
-          requires:
-            - nightly_binary_macos_conda_py3.6
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_conda_py3.6_upload
+          requires:
+          - nightly_binary_macos_conda_py3.6
       - binary_macos_conda:
-          name: nightly_binary_macos_conda_py3.7
-          python_version: "3.7"
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_conda_py3.7
+          python_version: '3.7'
       - binary_conda_upload:
-          name: nightly_binary_macos_conda_py3.7_upload
           context: org-member
-          requires:
-            - nightly_binary_macos_conda_py3.7
           filters:
             branches:
               only: nightly
+          name: nightly_binary_macos_conda_py3.7_upload
+          requires:
+          - nightly_binary_macos_conda_py3.7
   docker_build:
     triggers:
       - schedule:

.circleci/config.yml.in

@@ -48,7 +48,7 @@ jobs:
       - checkout
       - run:
           command: |
-            pip install --user --progress-bar off jinja2
+            pip install --user --progress-bar off jinja2 pyyaml
             python .circleci/regenerate.py
             git diff --exit-code || (echo ".circleci/config.yml not in sync with config.yml.in! Run .circleci/regenerate.py to update config"; exit 1)
 
@@ -223,62 +223,6 @@ jobs:
             docker tag ${image_name}:${CIRCLE_WORKFLOW_ID} 308535385114.dkr.ecr.us-east-1.amazonaws.com/${image_name}:${CIRCLE_WORKFLOW_ID}
             docker push 308535385114.dkr.ecr.us-east-1.amazonaws.com/${image_name}:${CIRCLE_WORKFLOW_ID}
 
-{%- macro workflow(btype, os, python_version, unicode, prefix='', filter_branch=None, upload=False) %}
-      - binary_{{os}}_{{btype}}:
-          name: {{prefix}}binary_{{os}}_{{btype}}_py{{python_version}}{{ "_unicode" if unicode }}
-          python_version: "{{python_version}}"
-{%-   if unicode %}
-          unicode_abi: "1"
-{%-   endif %}
-{%-   if filter_branch %}
-          filters:
-            branches:
-              only: {{filter_branch}}
-{%-   endif %}
-
-{%-   if upload %}
-      - binary_{{btype}}_upload:
-          name: {{prefix}}binary_{{os}}_{{btype}}_py{{python_version}}{{ "_unicode" if unicode }}_upload
-          context: org-member
-          requires:
-            - {{prefix}}binary_{{os}}_{{btype}}_py{{python_version}}{{ "_unicode" if unicode }}
-{%-       if filter_branch == 'nightly' %}
-{%-         if os == 'linux' and not python_version.startswith("2.") %}
-{%-            if btype == 'wheel' %}
-      - smoke_test_linux_pip:
-          name: {{prefix}}binary_{{os}}_{{btype}}_py{{python_version}}{{ "_unicode" if unicode }}_smoke_test_pip
-          python_version: "{{python_version}}"
-          requires:
-            - {{prefix}}binary_{{os}}_{{btype}}_py{{python_version}}{{ "_unicode" if unicode }}_upload
-{%-            else %}
-      - smoke_test_linux_conda:
-          name: {{prefix}}binary_{{os}}_{{btype}}_py{{python_version}}{{ "_unicode" if unicode }}_smoke_test_conda
-          python_version: "{{python_version}}"
-          requires:
-            - {{prefix}}binary_{{os}}_{{btype}}_py{{python_version}}{{ "_unicode" if unicode }}_upload
-{%-            endif %}
-{%-         endif %}
-{%-       endif %}
-{%-   if filter_branch %}
-          filters:
-            branches:
-              only: {{filter_branch}}
-{%-   endif %}
-{%-   endif %}
-{%- endmacro %}
-
-{%- macro workflows(prefix='', filter_branch=None, upload=False) %}
-{%- for btype in ["wheel", "conda"] -%}
-{%-   for os in ["linux", "macos"] -%}
-{%-     for python_version in ["2.7", "3.5", "3.6", "3.7"] -%}
-{%-       for unicode in ([False, True] if btype == "wheel" and python_version == "2.7" else [False]) -%}
-          {{ workflow(btype, os, python_version, unicode, prefix=prefix, filter_branch=filter_branch, upload=upload) }}
-{%-       endfor -%}
-{%-     endfor -%}
-{%-   endfor -%}
-{%- endfor %}
-{%- endmacro %}
-
 workflows:
   build:
 {%- if True %}

.circleci/regenerate.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
+
+"""
+This script should use a very simple, functional programming style.
+Avoid Jinja macros in favor of native Python functions.
+
+Don't go overboard on code generation; use Python only to generate
+content that can't be easily declared statically using CircleCI's YAML API.
+
+Data declarations (e.g. the nested loops for defining the configuration matrix)
+should be at the top of the file for easy updating.
+
+See this comment for design rationale:
+https://github.com/pytorch/vision/pull/1321#issuecomment-531033978
+"""
 
 import jinja2
+import yaml
 import os.path
 
-d = os.path.dirname(__file__)
-env = jinja2.Environment(
-    loader=jinja2.FileSystemLoader(d),
-    lstrip_blocks=True,
-    autoescape=False,
-)
-with open(os.path.join(d, 'config.yml'), 'w') as f:
-    f.write(env.get_template('config.yml.in').render())
+
+def workflows(prefix='', upload=False, filter_branch=None, indentation=6):
+    w = []
+    for btype in ["wheel", "conda"]:
+        for os_type in ["linux", "macos"]:
+            for python_version in ["2.7", "3.5", "3.6", "3.7"]:
+                for unicode in ([False, True] if btype == "wheel" and python_version == "2.7" else [False]):
+                    w += workflow_pair(btype, os_type, python_version, unicode, filter_branch, prefix, upload)
+
+    return indent(indentation, w)
+
+
+def workflow_pair(btype, os_type, python_version, unicode, filter_branch, prefix='', upload=False):
+
+    w = []
+    unicode_suffix = "_unicode" if unicode else ""
+    base_workflow_name = "{prefix}binary_{os_type}_{btype}_py{python_version}{unicode_suffix}".format(
+        prefix=prefix,
+        os_type=os_type,
+        btype=btype,
+        python_version=python_version,
+        unicode_suffix=unicode_suffix)
+
+    w.append(generate_base_workflow(base_workflow_name, python_version, unicode, filter_branch, os_type, btype))
+
+    if upload:
+
+        is_py3_linux = os_type == 'linux' and not python_version.startswith("2.")
+
+        # XXX This logic is suspect...
+        upload_job_filter_branch = not is_py3_linux and filter_branch
+
+        w.append(generate_upload_workflow(base_workflow_name, upload_job_filter_branch, btype))
+
+        if filter_branch == 'nightly' and is_py3_linux:
+            pydistro = 'pip' if btype == 'wheel' else 'conda'
+            w.append(generate_smoketest_workflow(pydistro, base_workflow_name, filter_branch, python_version))
+
+    return w
+
+
+def generate_base_workflow(base_workflow_name, python_version, unicode, filter_branch, os_type, btype):
+
+    d = {
+        "name": base_workflow_name,
+        "python_version": python_version,
+    }
+
+    if unicode:
+        d["unicode_abi"] = '1'
+
+    if filter_branch:
+        d["filters"] = gen_filter_branch_tree(filter_branch)
+
+    return {"binary_{os_type}_{btype}".format(os_type=os_type, btype=btype): d}
+
+
+def gen_filter_branch_tree(branch_name):
+    return {"branches": {"only": branch_name}}
+
+
+def generate_upload_workflow(base_workflow_name, filter_branch, btype):
+    d = {
+        "name": "{base_workflow_name}_upload".format(base_workflow_name=base_workflow_name),
+        "context": "org-member",
+        "requires": [base_workflow_name],
+    }
+
+    if filter_branch:
+        d["filters"] = gen_filter_branch_tree(filter_branch)
+
+    return {"binary_{btype}_upload".format(btype=btype): d}
+
+
+def generate_smoketest_workflow(pydistro, base_workflow_name, filter_branch, python_version):
+
+    required_build_suffix = "_upload"
+    required_build_name = base_workflow_name + required_build_suffix
+
+    smoke_suffix = "smoke_test_{pydistro}".format(pydistro=pydistro)
+    d = {
+        "name": "{base_workflow_name}_{smoke_suffix}".format(
+            base_workflow_name=base_workflow_name, smoke_suffix=smoke_suffix),
+        "requires": [required_build_name],
+        "python_version": python_version,
+    }
+
+    if filter_branch:
+        d["filters"] = gen_filter_branch_tree(filter_branch)
+
+    return {"smoke_test_linux_{pydistro}".format(pydistro=pydistro): d}
+
+
+def indent(indentation, data_list):
+    return ("\n" + " " * indentation).join(yaml.dump(data_list).splitlines())
+
+
+if __name__ == "__main__":
+    d = os.path.dirname(__file__)
+    env = jinja2.Environment(
+        loader=jinja2.FileSystemLoader(d),
+        lstrip_blocks=True,
+        autoescape=False,
+    )
+
+    with open(os.path.join(d, 'config.yml'), 'w') as f:
+        f.write(env.get_template('config.yml.in').render(workflows=workflows))

.circleci/test/test_sort_yaml.py

+#!/usr/bin/env python3
+
+"""
+To compare new version with previous:
+
+    ./regenerate.sh
+    meld <(git show HEAD:./config.yml | ./sort-yaml.py) <(cat config.yml | ./sort-yaml.py)
+"""
+
+
+import sys
+import yaml
+
+sys.stdout.write(yaml.dump(yaml.load(sys.stdin, Loader=yaml.FullLoader), sort_keys=True))