style(git): Add husky & commitlint to enforce conventional-commit format.

Author: timoxley

.husky/.gitignore

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+_

.husky/commit-msg

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+#!/bin/sh
+BRANCH_NAME=$(git branch | grep '*' | sed 's/* //')
+
+if [ $BRANCH_NAME != '(no branch)' ]
+then
+    # don't run hook when rebasing
+    . "$(dirname "$0")/_/husky.sh"
+
+    npx --no-install commitlint --edit
+fi

commitlint.config.js

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+module.exports = {
+    extends: ['@commitlint/config-conventional'],
+    rules: {
+        // don't care about line length
+        // 200 seems generous, also just warn
+        'header-max-length': [1, 'always', 200],
+        'body-max-line-length': [1, 'always', 200],
+        'footer-max-line-length': [1, 'always', 200],
+        // don't care about case
+        'header-case': [0, 'always', 'lower-case'],
+        'subject-case': [0, 'always', 'lower-case'],
+        'body-case': [0, 'always', 'lower-case'],
+        // don't care about trailing full-stop.
+        'subject-full-stop': [0, 'never', '.'],
+        'header-full-stop': [0, 'never', '.']
+    }
+}