chore: use script to handle the commitlint logic

This script was already used on Dredd Transactions, but I forgot it's there. Porting it to Dredd as well as it's smart and convenient.

.travis.yml

@@ -8,9 +8,6 @@ cache:
   directories:
     - "node_modules"
 before_install:
-  # Travis CI has only shallow clone of the repository. We need to get the 'master' branch
-  # so 'commitlint' could compare commits and lint them: marionebl/conventional-changelog-lint#7
-  - "git remote set-branches origin master && git fetch && git checkout master && git checkout -"
   - "npm -g install npm@6"
   - "pyenv global 3.6"
   - "pip install pip --upgrade"

package.json

@@ -17,15 +17,13 @@
     "docs:test-extensions": "python -m unittest docs/_extensions/*.py --verbose",
     "docs:build": "sphinx-build -nW -b html ./docs ./docs/_build",
     "docs:serve": "sphinx-autobuild ./docs ./docs/_build",
-    "lint:commits": "commitlint --from=master",
-    "lint:code": "eslint .",
-    "lint": "npm run lint:commits && npm run lint:code",
+    "lint": "./scripts/commitlint.sh && eslint .",
     "prepare": "npm run build",
     "pretest": "npm run build",
     "test": "mocha \"./test/**/*-test.js\"",
     "test:coverage": "./scripts/coverage.sh",
     "test:debug": "mocha --debug-brk \"./test/**/*-test.js\"",
-    "ci:lint": "commitlint-travis && npm run lint:code && npm run docs:lint && npm run docs:test-extensions",
+    "ci:lint": "npm run lint && npm run docs:lint && npm run docs:test-extensions",
     "ci:docs": "npm run docs:build",
     "ci:test": "npm run test:coverage && npm run coveralls",
     "ci:release": "semantic-release && npm dist-tag add \"dredd@$(npm view dredd version)\" stable"

scripts/commitlint.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# Validates format of the commit messages on Travis CI
+
+
+set -e  # aborts as soon as anything returns non-zero exit status
+
+
+if [ ! -z "$TRAVIS" ]; then
+  git remote set-branches origin master
+  git fetch --unshallow --quiet
+  git checkout master --quiet
+  git checkout - --quiet
+  ./node_modules/.bin/commitlint-travis
+else
+  ./node_modules/.bin/commitlint --from=master
+fi