Merge pull request #29 from softprops/pages-deploy

update travis build

.travis.yml

@@ -2,53 +2,78 @@ sudo: required
 
 language: rust
 
+# only build pushes to master
+# prs are build separately
+# https://docs.travis-ci.com/user/pull-requests/#how-pull-requests-are-built
+branches:
+  only:
+  - master
+
 matrix:
   fast_finish: true
   include:
-    - rust: nightly
+    - rust: nightly-2018-10-16
     - rust: beta
     - rust: stable
-  allow_failures:
-    - rust: nightly
 
 script:
-  - cargo +nightly fmt --all -- --check
-  - cargo test
-  - 'if [  $TRAVIS_RUST_VERSION = nightly ]; then cargo bench; fi'
+- |
+  if [[ "$TRAVIS_RUST_VERSION" == nightly-2018-10-16 ]]; then
+    cargo fmt --all -- --check
+  fi
+- cargo test
+- |
+  if [[ "$TRAVIS_RUST_VERSION" == nightly-2018-10-16 ]]; then
+    cargo bench
+  fi
+
+# Cache `cargo install`ed tools, but don't cache the project's `target`
+# directory (which ends up over-caching and filling all disk space!)
+# https://levans.fr/rust_travis_cache.html
+cache:
+  directories:
+    - /home/travis/.cargo
 
 before_cache:
+  # But don't cache the cargo registry
+  - rm -rf /home/travis/.cargo/registry
+  # Travis can't cache files that are not readable by "others"
   - chmod -R a+r $HOME/.cargo
 
-cache:
-  cargo: true
-  apt: true
-
 addons:
   apt:
     packages:
       # required by tarpaulin code coverage tool
       - libssl-dev
 
 install: |
-  rustup toolchain install nightly
-  rustup component add rustfmt-preview --toolchain nightly
-  if [[ "$TRAVIS_RUST_VERSION" == stable ]]; then
-    `RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo +nightly install --force cargo-tarpaulin`
+  # should only be necessary until rustfmt produces consistent results in stable/nightly
+  # see also https://github.com/xd009642/tarpaulin/issues/150 for tarpaulin nightly dependency
+  if [[ "$TRAVIS_RUST_VERSION" == nightly-2018-10-16 ]]; then
+    `RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo install --force cargo-tarpaulin`
+    rustup component add rustfmt-preview
   fi
 
 after_success:
   # report coverage to coveralls
   # see https://github.com/xd009642/tarpaulin for more information
   - '[ $TRAVIS_EVENT_TYPE != "cron" ] &&
-    [ $TRAVIS_RUST_VERSION = stable ] &&
+    [ $TRAVIS_RUST_VERSION = nightly-2018-10-16 ] &&
     [ $TRAVIS_BRANCH = master ] &&
     [ $TRAVIS_PULL_REQUEST = false ] &&
-    cargo +nightly tarpaulin --ciserver travis-ci --coveralls $TRAVIS_JOB_ID || true'
+    cargo tarpaulin --ciserver travis-ci --coveralls $TRAVIS_JOB_ID || true'
   - >-
     [ $TRAVIS_RUST_VERSION = stable ] && [ $TRAVIS_BRANCH = master ] && [
     $TRAVIS_PULL_REQUEST = false ] && cargo doc --no-deps && echo "<meta
     http-equiv=refresh content=0;url=`echo $TRAVIS_REPO_SLUG | cut -d / -f
-    2`/index.html>" > target/doc/index.html && pip install --user ghp-import &&
-    /home/travis/.local/bin/ghp-import -n target/doc && git push -fq
-    https://${GH_TOKEN}@github.com/${TRAVIS_REPO_SLUG}.git gh-pages && echo
-    "documented"
+    2`/index.html>" > target/doc/index.html
+
+deploy:
+  provider: pages
+  skip-cleanup: true
+  github-token: $GH_TOKEN
+  local-dir: target/doc
+  keep-history: false
+  on:
+    branch: master
+    condition: $TRAVIS_RUST_VERSION = stable