workflow: enforce commit format

package.json

@@ -17,7 +17,8 @@
     "boot": "node scripts/bootstrap.js"
   },
   "gitHooks": {
-    "pre-commit": "lint-staged"
+    "pre-commit": "lint-staged",
+    "commit-msg": "node scripts/verifyCommitMsg.js"
   },
   "jest": {
     "testEnvironment": "node",

scripts/verifyCommitMsg.js

@@ -0,0 +1,18 @@
+const chalk = require('chalk')
+const msgPath = process.env.GIT_PARAMS
+const msg = require('fs').readFileSync(msgPath, 'utf-8').trim()
+
+const commitRE = /^(revert: )?(feat|fix|docs|style|refactor|perf|test|workflow|ci|chore|types)(\(.+\))?: .{1,50}/
+
+if (!commitRE.test(msg)) {
+  console.log()
+  console.error(
+    `  ${chalk.bgRed.white(' ERROR ')} ${chalk.red(`invalid commit message format.`)}\n\n` +
+    chalk.red(`  Proper commit message format is required for automated changelog generation. Examples:\n\n`) +
+    `    ${chalk.green(`feat(compiler): add 'comments' option`)}\n` +
+    `    ${chalk.green(`fix(v-model): handle events on blur (close #28)`)}\n\n` +
+    chalk.red(`  See .github/COMMIT_CONVENTION.md for more details.\n`) +
+    chalk.red(`  You can also use ${chalk.cyan(`npm run commit`)} to interactively generate a commit message.\n`)
+  )
+  process.exit(1)
+}