chore(ci): add commit lint

.travis.yml

@@ -9,6 +9,8 @@ cache:
 node_js:
   - '8'
 
+before_install: git fetch --unshallow
+
 install:
   - npm install
   - curl https://install.meteor.com/ | sh
@@ -19,6 +21,7 @@ stages:
   - release
 
 script:
+  - ./bin/lint-commit.sh
   - npm test
   - if [ "$TRAVIS_BRANCH" == "master" ]; then npm run semantic-release; fi
 

bin/lint-commit.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -e
+set -u
+
+if [[ $TRAVIS_PULL_REQUEST_SLUG != "" && $TRAVIS_PULL_REQUEST_SLUG != $TRAVIS_REPO_SLUG ]]; then
+    # This is a Pull Request from a different slug, hence a forked repository
+    git remote add "$TRAVIS_PULL_REQUEST_SLUG" "https://github.com/$TRAVIS_PULL_REQUEST_SLUG.git"
+    git fetch "$TRAVIS_PULL_REQUEST_SLUG"
+
+    # Use the fetched remote pointing to the source clone for comparison
+    TO="$TRAVIS_PULL_REQUEST_SLUG/$TRAVIS_PULL_REQUEST_BRANCH"
+else
+    # This is a Pull Request from the same remote, no clone repository
+    TO=$TRAVIS_COMMIT
+fi
+
+# Lint all commits in the PR
+# - Covers fork pull requests (when TO=slug/branch)
+# - Covers branch pull requests (when TO=branch)
+./node_modules/.bin/commitlint --from="$TRAVIS_BRANCH" --to="$TO"
+
+# Always lint the triggerig commit
+# - Covers direct commits
+./node_modules/.bin/commitlint --from="$TRAVIS_COMMIT"
+H