Add a configuration for linting commit messages

.travis.yml

@@ -10,3 +10,4 @@ before_install: if [[ `npm -v` != 6* ]]; then npm i -g [email protected]; fi
 
 script:
    - grunt standards
+   - commitlint-travis

README.md

@@ -15,6 +15,28 @@ Shareable [ESLint](http://eslint.org/) configuration for all Silvermine projects
 Because we need it. Whitespace errors are evil. As are the other hundreds of
 types of errors this protects us from.
 
+## Other Configuration Files Available
+
+In addition to the ESLint rules, this package provides configuration for the following:
+
+ * [EditorConfig](https://editorconfig.org/)
+   * Provides a default set of editor configuration values to use in Silvermine projects
+   * Usage: Symlink the .editorconfig file to the root of your project and use the
+     appropriate extension for your editor.
+      * `ln -s ./node_modules/@silvermine/eslint-config/.editorconfig`
+* [commitlint](https://conventional-changelog.github.io/commitlint/)
+  * Provides linting for commit messages of Silvermine projects
+  * Usage: Add a `commitlint.config.js` file to the root of the project with the
+    following and then set up commitlint in the project:
+    ```javascript
+    'use strict';
+
+    module.exports = {
+       extends: [ '@silvermine/eslint-config/commitlint' ],
+    };
+    ```
+
+
 
 ## Notes on Semantic Versioning
 

commitlint.config.js

@@ -0,0 +1,5 @@
+'use strict';
+
+module.exports = {
+   extends: [ './commitlint.js' ],
+};

commitlint.js

@@ -0,0 +1,39 @@
+'use strict';
+
+module.exports = {
+   rules: {
+      'body-leading-blank': [ 2, 'always' ],
+      'body-max-line-length': [ 2, 'always', 90 ],
+      'footer-leading-blank': [ 2, 'always' ],
+      'footer-max-line-length': [ 2, 'always', 90 ],
+      'header-max-length': [ 2, 'always', 72 ],
+      'scope-case': [ 2, 'always', [ 'lower-case', 'kebab-case' ] ],
+      'scope-empty': [ 2, 'always' ],
+      'subject-case': [
+         2,
+         'never',
+         [ 'upper-case' ],
+      ],
+      'subject-empty': [ 2, 'never' ],
+      'subject-full-stop': [ 2, 'never', '.' ],
+      'type-case': [ 2, 'always', 'lower-case' ],
+      'type-empty': [ 2, 'never' ],
+      'type-enum': [
+         2,
+         'always',
+         [
+            'build',
+            'chore',
+            'ci',
+            'docs',
+            'feat',
+            'fix',
+            'perf',
+            'refactor',
+            'revert',
+            'style',
+            'test',
+         ],
+      ],
+   },
+};