Add lefthook configuration for documentation

doc/README.md

@@ -452,7 +452,7 @@ Learn more about using Git, and using Git with GitLab:
 
 ## Coming to GitLab from another platform
 
-If you are coming to GitLab from another platform, you'll find the following information useful:
+If you are coming to GitLab from another platform, the following information is useful:
 
 | Topic                                                          | Description                                                                            |
 |:---------------------------------------------------------------|:---------------------------------------------------------------------------------------|

doc/administration/gitaly/index.md

@@ -373,7 +373,7 @@ As the final step, you must update Gitaly clients to switch from using local Git
 the Gitaly servers you just configured.
 
 This can be risky because anything that prevents your Gitaly clients from reaching the Gitaly
-servers will cause all Gitaly requests to fail. For example, any sort of network, firewall, or name
+servers causes all Gitaly requests to fail. For example, any sort of network, firewall, or name
 resolution problems.
 
 Additionally, you must [disable Rugged](../nfs.md#improving-nfs-performance-with-gitlab)

lefthook.yml

@@ -13,6 +13,11 @@ pre-push:
       files: git diff --name-only $(git merge-base origin/master HEAD)..HEAD
       glob: "*.html.haml"
       run: bundle exec haml-lint --config .haml-lint.yml {files}
+    markdownlint:
+      tags: documentation style
+      files: git diff --name-only $(git merge-base origin/master HEAD)..HEAD
+      glob: "*.md"
+      run: yarn markdownlint {files}
     scss-lint:
       tags: stylesheet css style
       files: git diff --name-only $(git merge-base origin/master HEAD)..HEAD
@@ -24,3 +29,8 @@ pre-push:
       files: git diff --name-only $(git merge-base origin/master HEAD)..HEAD
       glob: "*.rb"
       run: bundle exec rubocop --parallel --force-exclusion {files}
+    vale:  # Requires Vale: https://docs.gitlab.com/ee/development/documentation/#install-linters
+      tags: documentation style
+      files: git diff --name-only $(git merge-base origin/master HEAD)..HEAD
+      glob: "*.md"
+      run: if command -v vale 2> /dev/null; then vale --config .vale.ini --minAlertLevel error {files}; else echo "Vale not found. Install Vale"; fi

package.json

@@ -11,6 +11,7 @@
     "eslint-staged-fix": "git diff --diff-filter=d --cached --name-only | grep -E \"(.*)\\.(js|vue)$\" | xargs eslint --cache --max-warnings 0 --report-unused-disable-directives --fix",
     "eslint-report": "eslint --max-warnings 0 --ext .js,.vue --format html --output-file ./eslint-report.html --no-inline-config .",
     "file-coverage": "scripts/frontend/file_test_coverage.js",
+    "lint-docs": "scripts/lint-doc.sh",
     "prejest": "yarn check-dependencies",
     "jest": "jest --config jest.config.js",
     "jest-debug": "node --inspect-brk node_modules/.bin/jest --runInBand",
@@ -20,7 +21,7 @@
     "karma": "BABEL_ENV=${BABEL_ENV:=karma} karma start --single-run true config/karma.config.js",
     "karma-coverage": "BABEL_ENV=coverage karma start --single-run true config/karma.config.js",
     "karma-start": "BABEL_ENV=karma karma start config/karma.config.js",
-    "markdownlint": "markdownlint -c .markdownlint.json 'doc/**/*.md'",
+    "markdownlint": "markdownlint --config .markdownlint.json",
     "postinstall": "node ./scripts/frontend/postinstall.js",
     "prettier-staged": "node ./scripts/frontend/prettier.js check",
     "prettier-staged-save": "node ./scripts/frontend/prettier.js save",