Merge pull request python-trio#294 from njsmith/yapf-on-travis

[travis] Check for code formatting problems

.travis.yml

@@ -15,6 +15,10 @@ matrix:
       language: python
       python: 3.6
       env: DOC_BUILD=1
+    - os: linux
+      language: python
+      python: 3.6
+      env: FORMATTING=1
     - os: linux
       language: generic
       env: USE_PYPY_NIGHTLY=1
@@ -27,9 +31,6 @@ matrix:
     - os: osx
       language: generic
       env: MACPYTHON=3.6.0
-  # 2017-03-07: They fixed the main bug I was hitting, so let's give it a try...
-  # allow_failures:
-  #   - env: USE_PYPY_NIGHTLY=1
 
 script:
   - ci/travis.sh

ci/travis.sh

@@ -64,6 +64,27 @@ if [ "$DOC_BUILD" = "1" ]; then
     # -n (nit-picky): warn on missing references
     # -W: turn warnings into errors
     sphinx-build -nW  -b html source build
+elif [ "$FORMATTING" = "1" ]; then
+    pip install -U yapf
+    yapf -rdp setup.py trio > formatting-fixes.patch
+    if [ -s formatting-fixes.patch ]; then
+        cat <<EOF
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+The following formatting problems were found. To fix them, run
+
+   pip install yapf
+   yapf -rip setup.py trio
+
+in your local checkout.
+
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+EOF
+        cat formatting-fixes.patch
+        exit 1
+    fi
 else
     # Actual tests
     pip install -Ur test-requirements.txt