Auto merge of #2878 - micbou:circleci, r=micbou

[RFC] Move macOS builds to CircleCI

See PR ycm-core/ycmd#901.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/valloric/youcompleteme/2878)
<!-- Reviewable:end -->

.circleci/config.yml

@@ -0,0 +1,63 @@
+version: 2
+aliases:
+  common: &common
+    macos:
+      xcode: 9.0
+  update-submodules: &update-submodules
+    run:
+      name: Update submodules
+      command: git submodule update --init --recursive
+  install-dependencies: &install-dependencies
+    run:
+      name: Install dependencies
+      command: .circleci/install_dependencies.sh
+  run-tests: &run-tests
+    run:
+      name: Run tests
+      command: ./run_tests.py --coverage
+  upload-coverage: &upload-coverage
+    run:
+      name: Upload coverage
+      command: bash <(curl -s https://codecov.io/bash)
+  # Increase the version key to clear the cache.
+  save-cache: &save-cache
+    save_cache:
+      key: v1-ycm-{{ .Environment.CIRCLE_JOB }}
+      paths:
+        - ~/Library/Caches/Homebrew
+        - ~/.cache/pip
+        - ~/.pyenv
+  restore-cache: &restore-cache
+    restore_cache:
+      key: v1-ycm-{{ .Environment.CIRCLE_JOB }}
+jobs:
+  python2:
+    <<: *common
+    steps:
+      - checkout
+      - *update-submodules
+      - *restore-cache
+      - *install-dependencies
+      - *save-cache
+      - *run-tests
+      - *upload-coverage
+    environment:
+      YCMD_PYTHON_VERSION: 2.7
+  python3:
+    <<: *common
+    steps:
+      - checkout
+      - *update-submodules
+      - *restore-cache
+      - *install-dependencies
+      - *save-cache
+      - *run-tests
+      - *upload-coverage
+    environment:
+      YCMD_PYTHON_VERSION: 3.3
+workflows:
+  version: 2
+  build:
+    jobs:
+      - python2
+      - python3

.circleci/install_dependencies.sh

@@ -0,0 +1,79 @@
+#!/bin/bash
+
+# Exit immediately if a command returns a non-zero status.
+set -e
+
+################
+# Homebrew setup
+################
+
+# There's a homebrew bug which causes brew update to fail the first time. Run
+# it twice to workaround. https://github.com/Homebrew/homebrew/issues/42553
+brew update || brew update
+
+# List of homebrew formulae to install in the order they appear.
+# We require CMake and Ninja for our build and tests, and all the others are
+# dependencies of pyenv.
+REQUIREMENTS="cmake
+              ninja
+              readline
+              autoconf
+              pkg-config
+              openssl"
+
+# Install CMake, Ninja, and pyenv dependencies.
+for pkg in $REQUIREMENTS; do
+  # Install package, or upgrade it if it is already installed.
+  brew install $pkg || brew outdated $pkg || brew upgrade $pkg
+done
+
+##############
+# Python setup
+##############
+
+PYENV_ROOT="${HOME}/.pyenv"
+
+if [ ! -d "${PYENV_ROOT}/.git" ]; then
+  rm -rf ${PYENV_ROOT}
+  git clone https://github.com/yyuu/pyenv.git ${PYENV_ROOT}
+fi
+pushd ${PYENV_ROOT}
+git fetch --tags
+git checkout v1.2.1
+popd
+
+PATH="${PYENV_ROOT}/bin:${PATH}"
+
+eval "$(pyenv init -)"
+
+if [ "${YCMD_PYTHON_VERSION}" == "2.7" ]; then
+  # We need a recent enough version of Python 2.7 on macOS or an error occurs
+  # when installing the psutil dependency for our tests.
+  PYENV_VERSION="2.7.8"
+else
+  PYENV_VERSION="3.3.6"
+fi
+
+# In order to work with ycmd, python *must* be built as a shared library. The
+# most compatible way to do this on macOS is with --enable-framework. This is
+# set via the PYTHON_CONFIGURE_OPTS option.
+export PYTHON_CONFIGURE_OPTS="--enable-framework"
+
+pyenv install --skip-existing ${PYENV_VERSION}
+pyenv rehash
+pyenv global ${PYENV_VERSION}
+
+# Initialize pyenv in other steps. See
+# https://circleci.com/docs/2.0/env-vars/#interpolating-environment-variables-to-set-other-environment-variables
+# and https://github.com/pyenv/pyenv/issues/264
+echo "export PATH=${PYENV_ROOT}/bin:\$PATH
+if [ -z \"\${PYENV_LOADING}\" ]; then
+  export PYENV_LOADING=true
+  eval \"\$(pyenv init -)\"
+  unset PYENV_LOADING
+fi" >> $BASH_ENV
+
+pip install -U pip wheel setuptools
+pip install -r python/test_requirements.txt
+
+set +e

.travis.yml

@@ -1,7 +1,4 @@
 language: generic
-os:
-  - linux
-  - osx
 sudo: false
 before_install:
   - git submodule update --init --recursive
@@ -20,10 +17,6 @@ env:
     - YCM_PYTHON_VERSION=2.6
     - YCM_PYTHON_VERSION=2.7
     - YCM_PYTHON_VERSION=3.3
-matrix:
-  exclude:
-    - os: osx
-      env: YCM_PYTHON_VERSION=2.6
 addons:
   apt:
     sources:

README.md

@@ -1,10 +1,11 @@
 YouCompleteMe: a code-completion engine for Vim
 ===============================================
 
-[![Gitter Room](https://img.shields.io/gitter/room/Valloric/YouCompleteMe.svg)](https://gitter.im/Valloric/YouCompleteMe)
-[![Build Status](https://travis-ci.org/Valloric/YouCompleteMe.svg?branch=master)](https://travis-ci.org/Valloric/YouCompleteMe)
-[![Build status](https://ci.appveyor.com/api/projects/status/ag9uqwi8s6btwjd8/branch/master?svg=true)](https://ci.appveyor.com/project/Valloric/YouCompleteMe)
-[![Coverage Status](https://codecov.io/gh/Valloric/YouCompleteMe/branch/master/graph/badge.svg)](https://codecov.io/gh/Valloric/YouCompleteMe)
+[![Gitter room](https://img.shields.io/gitter/room/Valloric/YouCompleteMe.svg)](https://gitter.im/Valloric/YouCompleteMe)
+[![Linux build status](https://img.shields.io/travis/Valloric/YouCompleteMe/master.svg?label=Linux)](https://travis-ci.org/Valloric/YouCompleteMe)
+[![macOS build status](https://img.shields.io/circleci/project/github/Valloric/YouCompleteMe/master.svg?label=macOS)](https://circleci.com/gh/Valloric/YouCompleteMe)
+[![Windows build status](https://img.shields.io/appveyor/ci/Valloric/YouCompleteMe/master.svg?label=Windows)](https://ci.appveyor.com/project/Valloric/YouCompleteMe)
+[![Coverage status](https://img.shields.io/codecov/c/github/Valloric/YouCompleteMe/master.svg)](https://codecov.io/gh/Valloric/YouCompleteMe)
 
 Help, Advice, Support
 ---------------------

ci/travis/travis_install.sh

@@ -7,18 +7,23 @@ set -ev
 # commands.
 unset -f cd popd pushd
 
-####################
-# OS-specific setup
-####################
+################
+# Compiler setup
+################
 
-# Requirements of OS-specific install:
-#  - install any software which is not installed by Travis configuration
-#  - set up everything necessary so that pyenv can build python
-source ci/travis/travis_install.${TRAVIS_OS_NAME}.sh
+# We can't use sudo, so we have to approximate the behaviour of setting the
+# default system compiler.
 
-#############
-# pyenv setup
-#############
+mkdir -p ${HOME}/bin
+
+ln -s /usr/bin/g++-4.8 ${HOME}/bin/c++
+ln -s /usr/bin/gcc-4.8 ${HOME}/bin/cc
+
+export PATH=${HOME}/bin:${PATH}
+
+##############
+# Python setup
+##############
 
 PYENV_ROOT="${HOME}/.pyenv"
 
@@ -43,6 +48,10 @@ else
   PYENV_VERSION="3.3.6"
 fi
 
+# In order to work with ycmd, python *must* be built as a shared library. This
+# is set via the PYTHON_CONFIGURE_OPTS option.
+export PYTHON_CONFIGURE_OPTS="--enable-shared"
+
 pyenv install --skip-existing ${PYENV_VERSION}
 pyenv rehash
 pyenv global ${PYENV_VERSION}
@@ -54,10 +63,6 @@ python_version=$(python -c 'import sys; print( "{0}.{1}".format( sys.version_inf
 echo "Checking python version (actual ${python_version} vs expected ${YCM_PYTHON_VERSION})"
 test ${python_version} == ${YCM_PYTHON_VERSION}
 
-############
-# pip setup
-############
-
 pip install -U pip wheel setuptools
 pip install -r python/test_requirements.txt