Rust lint and coverage on Travis

.travis.yml

@@ -1,19 +1,64 @@
-language: rust
 os:
   - linux
   - osx
+dist: xenial
+sudo: false
+addons:
+  apt:
+    packages:
+      # necessary for kcov
+      - libcurl4-openssl-dev
+      - libelf-dev
+      - libdw-dev
+      - libiberty-dev
+      - binutils-dev
+      - cmake
+      - gcc
+
+language: rust
 rust:
   - stable
   - nightly
-before_script:
-  - pip2 install 'travis-cargo<0.2' --user  && export PATH=$HOME/Library/Python/2.7/bin:$HOME/.local/bin:$PATH
-script:
-  - travis-cargo test
-  - travis-cargo build -- --manifest-path examples/drive_example/Cargo.toml
-  - travis-cargo build -- --manifest-path examples/service_account/Cargo.toml
-  - travis-cargo test -- --no-default-features --features no-openssl
-after_success:
-  - "[[ $TRAVIS_OS_NAME = linux ]] && travis-cargo --only stable coveralls"
-env:
-  global:
-    - TRAVIS_CARGO_NIGHTLY_FEATURE=""
+
+stages:
+  - name: test
+  - name: lint
+  - name: coverage
+
+install: true
+
+# Default script is the "test" stage
+script: 
+  - cargo build
+  - cargo test
+  - cargo build --manifest-path examples/drive_example/Cargo.toml
+  - cargo build --manifest-path examples/service_account/Cargo.toml
+  - cargo test --no-default-features --features no-openssl
+
+jobs:
+  include:
+    - stage: lint
+      if: os = linux
+      rust: stable
+      install:
+        - rustup component add clippy
+        - rustup component add rustfmt
+      script:
+        - cargo fmt --all -- --check || true
+        - cargo clippy --all-targets --all-features -- -D warnings || true
+
+    - stage: coverage
+      if: os = linux
+      sudo: true
+      rust: stable
+      env:
+        - RUSTFLAGS="-C link-dead-code -C debuginfo=2 -C opt-level=0"
+        - CACHE_NAME="coverage"
+      install:
+        - ./.travis/install-kcov.sh "v36" "29ccdde3bd44f14e0d7c88d709e1e5ff9b448e735538ae45ee08b73c19a2ea0b" && export PATH="kcov/usr/bin:${PATH}";
+      script:
+        - cargo test --no-run
+        - ./.travis/run-kcov.sh "yup_oauth2"
+        - bash <(curl -s https://codecov.io/bash) -F "${TRAVIS_RUST_VERSION}"
+
+cache: cargo

.travis/install-kcov.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -o verbose
+set -o errexit
+set -o pipefail
+
+KCOV_VERSION="${1}"
+KCOV_SHA256_HASH="${2}"
+
+curl -L --output "kcov.tar.gz" "https://github.com/SimonKagstrom/kcov/archive/${KCOV_VERSION}.tar.gz"
+sha256sum "kcov.tar.gz"
+echo "${KCOV_SHA256_HASH}  kcov.tar.gz" | sha256sum -c
+
+mkdir kcov-src
+mkdir kcov
+
+cd kcov-src
+tar -xf ../kcov.tar.gz --strip-components=1
+rm ../kcov.tar.gz
+
+mkdir build
+cd build
+cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr ..
+make -j 2
+make install DESTDIR=../../kcov
+cd ../../
+rm -r kcov-src
+
+echo "kcov should not be available via 'kcov/usr/bin/kcov'"

.travis/run-kcov.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -o verbose
+set -o errexit
+set -o pipefail
+
+PROGRAM_NAME="${1}"
+
+echo "Coverage testing of ${PROGRAM_NAME}"
+
+for file in target/debug/${PROGRAM_NAME}-*; do
+    [ -x "${file}" ] || continue
+    mkdir -p "target/cov/$(basename ${file})";
+    kcov --exclude-pattern='/.cargo,/usr/lib' --verify "target/cov/$(basename ${file})" "${file}";
+done