3 files changed, 81 insertions, 0 deletions
diff --git a/.github/workflows/commitlint.config.js b/.github/workflows/commitlint.config.js
new file mode 100644
index 0000000000..5f10ffc6f4
--- /dev/null
+++ b/.github/workflows/commitlint.config.js
@@ -0,0 +1,35 @@
+module.exports = {
+	rules: {
+		'body-leading-blank': [1, 'always'],
+		'body-max-line-length': [2, 'always', 100],
+		'footer-leading-blank': [1, 'always'],
+		'footer-max-line-length': [2, 'always', 100],
+		'header-max-length': [2, 'always', 100],
+		'scope-case': [2, 'always', 'lower-case'],
+		'subject-case': [
+			2,
+			'never',
+			['sentence-case', 'start-case', 'pascal-case', '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',
+				'test',
+			],
+		],
+	},
+};
diff --git a/.github/workflows/commitlint.config_patch.js b/.github/workflows/commitlint.config_patch.js
new file mode 100644
index 0000000000..986d80b2e0
--- /dev/null
+++ b/.github/workflows/commitlint.config_patch.js
@@ -0,0 +1,28 @@
+module.exports = {
+	parserPreset: {
+		parserOpts: { headerPattern: /^([^\(\):]*)(?:\((.*)\))?!?:(.*)$/ }
+	},
+	rules: {
+		'body-leading-blank': [1, 'always'],
+		'body-max-line-length': [2, 'always', 100],
+		'footer-leading-blank': [1, 'always'],
+		'footer-max-line-length': [2, 'always', 100],
+		'scope-case': [2, 'always', 'lower-case'],
+		'subject-case': [
+			2,
+			'never',
+			['sentence-case', 'start-case', 'pascal-case', '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',
+			[
+				'vim-patch',
+			],
+		],
+	},
+};
diff --git a/.github/workflows/commitlint.yml b/.github/workflows/commitlint.yml
new file mode 100644
index 0000000000..9ae138fbd7
--- /dev/null
+++ b/.github/workflows/commitlint.yml
@@ -0,0 +1,18 @@
+name: "Commit Linter"
+on: pull_request
+jobs:
+  lint-commits:
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v2.3.1
+        with:
+          fetch-depth: 0
+      - run: npm install --save-dev @commitlint/cli
+      - run: |
+          if [[ "$(gh pr view ${{ github.event.pull_request.number }} --json commits --jq '.[][0].messageHeadline')" == vim-patch* ]];then
+            npx commitlint --from HEAD~1 --to HEAD --verbose --help-url https://github.com/neovim/neovim/blob/master/CONTRIBUTING.md#commit-messages --config .github/workflows/commitlint.config_patch.js
+          else
+            npx commitlint --from HEAD~1 --to HEAD --verbose --help-url https://github.com/neovim/neovim/blob/master/CONTRIBUTING.md#commit-messages --config .github/workflows/commitlint.config.js
+          fi