Merge pull request #760 from hugovk/diff_cover

Show coverage and quality reports for each diff

.travis.yml

@@ -41,8 +41,15 @@ script:
 after_success:
   - coverage report
   - coveralls
+
   - pip install pep8 pyflakes
   - pep8 --statistics --count PIL/*.py
   - pep8  --statistics --count Tests/*.py
   - pyflakes PIL/*.py   | tee >(wc -l)
   - pyflakes Tests/*.py | tee >(wc -l)
+
+
+    # Coverage and quality reports on just the latest diff.
+    # (Installation is very slow on Py3, so just do it for Py2.)
+  - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then Scripts/diffcover-install.sh; fi
+  - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then Scripts/diffcover-run.sh; fi

Scripts/diffcover-install.sh

@@ -0,0 +1,7 @@
+# Fetch the remote master branch before running diff-cover on Travis CI.
+# https://github.com/edx/diff-cover#troubleshooting
+git fetch origin master:refs/remotes/origin/master
+
+# CFLAGS=-O0 means build with no optimisation.
+# Makes build much quicker for lxml and other dependencies.
+time CFLAGS=-O0 pip install --use-wheel diff_cover

Scripts/diffcover-run.sh

@@ -0,0 +1,4 @@
+coverage xml
+diff-cover coverage.xml
+diff-quality --violation=pyflakes
+diff-quality --violation=pep8