Use Docker for easier test running (#86)

Switches to CircleCI instead of Travis, which handles running tests in
Docker much better, especially since Travis is really slow (~30min vs
2.5min on CircleCI).

The Docker image is based on
https://github.com/tweekmonster/vim-testbed, and targets are added to
the Makefile to build/push it.

.circleci/config.yml

@@ -0,0 +1,31 @@
+version: 2
+
+jobs:
+  test:
+    docker:
+      - image: blueyed/vim-python-pep8-indent-vims-for-test:1@sha256:8c77867e1fdf673a6df0ecf6628f8e4d80579a0a097ec196109ca0bc145d86c0
+    steps:
+      - checkout
+      - run:
+          name: Run tests
+          command: |
+            Xvfb :99 &
+            DISPLAY=:99 VIMRUNNER_REUSE_SERVER=1 rspec spec
+
+  checkqa:
+    docker:
+      - image: circleci/python:3.7
+    steps:
+      - checkout
+      - run:
+          name: Lint
+          command: |
+            pip install --user vim-vint
+            ~/.local/bin/vint **/*.vim
+
+workflows:
+  version: 2
+  test:
+    jobs:
+      - test
+      - checkqa

.dockerignore

@@ -0,0 +1,4 @@
+*
+!Gemfile
+!indent
+!spec

CONTRIBUTING.rst

@@ -20,6 +20,14 @@ Running Tests
 - Run the tests with the command::
 
    $ rspec spec
+- Alternatively you can use Docker::
+
+   $ make test_docker
+
+- You can select tests based on line numbers, e.g.::
+
+   $ rspec ./spec/indent/indent_spec.rb:385
+   $ make test_docker RSPEC_ARGS=./spec/indent/indent_spec.rb:385
 
 Thank you for considering to contribute!
 

Dockerfile

@@ -0,0 +1,19 @@
+FROM testbed/vim:latest
+
+RUN apk --no-cache add gtk+2.0-dev libx11-dev libxt-dev mcookie xauth xvfb
+RUN install_vim -tag master --with-features=normal \
+  --disable-channel --disable-netbeans --disable-xim \
+  --enable-gui=gtk2 --with-x -build
+RUN ln -s /vim-build/bin/vim-master /usr/bin/gvim
+RUN gvim --version
+
+WORKDIR /vim-python-pep8-indent
+
+ADD Gemfile .
+RUN apk --no-cache add coreutils ruby-bundler
+RUN bundle install
+
+ADD indent ./indent
+ADD spec ./spec
+
+ENTRYPOINT ["rspec", "spec"]

Makefile

@@ -6,3 +6,23 @@ test_slow:
 
 test_visible:
 	VIMRUNNER_REUSE_SERVER=1 bundle exec rspec
+
+# Run tests in dockerized Vims.
+DOCKER_REPO:=blueyed/vim-python-pep8-indent-vims-for-test
+DOCKER_TAG:=1
+DOCKER_IMAGE:=$(DOCKER_REPO):$(DOCKER_TAG)
+
+docker_image:
+	docker build -t $(DOCKER_REPO):$(DOCKER_TAG) .
+docker_push:
+	docker push $(DOCKER_REPO):$(DOCKER_TAG)
+docker_update_latest:
+	docker tag $(DOCKER_REPO):$(DOCKER_TAG) $(DOCKER_REPO):latest
+	docker push $(DOCKER_REPO):latest
+
+test_docker: XVFB_ERRORFILE:=/dev/null
+test_docker:
+	@set -x; export DISPLAY=$(if $(VIMRUNNER_TEST_DISPLAY),$(VIMRUNNER_TEST_DISPLAY),172.17.0.1:99; Xvfb -ac -listen tcp :99 >$(XVFB_ERRORFILE) 2>&1 & XVFB_PID=$$!); \
+	  docker run --rm -ti -e DISPLAY -e VIMRUNNER_REUSE_SERVER=1 \
+	  -v $(CURDIR):/vim-python-pep8-indent $(DOCKER_IMAGE) $(RSPEC_ARGS) \
+	  $(if $(VIMRUNNER_TEST_DISPLAY),,; ret=$$?; kill $$XVFB_PID; exit $$ret)

docker-compose.yml

@@ -0,0 +1,6 @@
+version: '2'
+services:
+  rspec:
+    build: .
+    volumes:
+    - .:/vim-python-pep8-indent