Migrate to CircleCI, or start to anyhow.

.circleci/config.yml

@@ -0,0 +1,70 @@
+version: 2.1
+
+orbs:
+  orb: invocations/orb@1.3.0
+
+
+jobs:
+
+  compat:
+    parameters:
+      python:
+        type: string
+      sphinx:
+        type: string
+    executor:
+      name: orb/default
+      version: "<< parameters.python >>"
+    steps:
+      - orb/setup
+      # Nuke ourselves and sphinx, for some cleanliness. (Ideal: a way to
+      # install dev deps + some other tweak, in the same step; can pip do
+      # that?)
+      - run: "pip uninstall -y alabaster sphinx"
+      # Get Sphinx under test, and then reinstall ourselves
+      - run: "pip install -U sphinx==<< parameters.sphinx >>"
+      - run: "pip install ."
+      - run: "pip list --format=columns"
+      # Make sure we can run (building our own docs, as we dogfood) w/o
+      # exploding.
+      # TODO: some suite of canaries to check for in the rendered html? How are
+      # other themes/plugins testing themselves?
+      - run: "inv docs"
+      - orb/debug
+
+
+workflows:
+  main:
+    jobs:
+      # These will all happen under Python 3.6 by default
+      - orb/lint:
+          name: Lint
+      - orb/format:
+          name: Style check
+      - orb/test-release:
+          name: Release test
+      - orb/docs:
+          name: Docs
+      # We have no tests to matrix, and this is too niche for the orb, so just
+      # do a bunch of install/run tests on different Python and Sphinx versions
+      # for compat testing.
+      - compat:
+          name: "Docs (Py<< matrix.python >>/Sphinx << matrix.sphinx >>)"
+          # May as well not burn a lot of credits if something is seriously
+          # busted.
+          requires: ["Docs"]
+          matrix:
+            parameters:
+              python: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+              # TODO: still need to find a way to solve escaping hell on circle
+              # re: parameters containing >< symbols
+              sphinx:
+                - "1.6.7"
+                - "1.7.9"
+                - "1.8.6"
+                - "2.4.5"
+                - "3.5.4"
+                - "4.5.0"
+                - "5.3.0"
+                - "6.1.3"
+            exclude: []

docs/changelog.rst

@@ -2,6 +2,8 @@
 Changelog
 =========
 
+- :support:`- backported` Modernized the project: s/Travis/Circle/ for CI,
+  README badges, ``setup.cfg`` removal, metadata refresh, etc.
 - :support:`- backported` Dropped support for Python 2 and Python <3.6. This
   includes various minor updates to work correctly with modern versions of
   Sphinx (1.6 at the very least). Thanks to Adam Turner for a pile of patches