*: add marklint check for changed files in PR (#1406)

* *: Add marklint check for docs

Signed-off-by: Aylei <rayingecho@gmail.com>

* Trigger check

Signed-off-by: Aylei <rayingecho@gmail.com>

* add the rule number for each lint rule

circle.yml → .circleci/config.yml

@@ -1,14 +1,36 @@
 version: 2
 
 jobs:
+  lint:
+    docker:
+      - image: circleci/ruby:2.4.1-node
+    working_directory: ~/pingcap/docs
+    steps:
+      - checkout
+
+      - run:
+          name: "Install markdownlint"
+          command: |
+            sudo npm install -g markdownlint-cli
+            markdownlint --version
+
+      - run:
+          name: "Lint README"
+          command: markdownlint README.md
+
+      - run:
+          name: "Lint edited files"
+          command: |
+            git remote add upstream https://github.com/pingcap/docs.git
+            git fetch upstream
+            markdownlint $(git diff-tree --name-only --no-commit-id -r upstream/master..HEAD -- '*.md' ':(exclude).github/*' ':(exclude)v1.0/*' ':(exclude)v2.0/*' ':(exclude)v2.1-legacy/*')
+
+
   build:
     docker:
       - image: andelf/doc-build:0.1.9
     working_directory: ~/pingcap/docs
-    branches:
-      only:
-        - master
-        - website-preview
+
     steps:
       - checkout
 
@@ -46,3 +68,17 @@ jobs:
 
       - store_artifacts:
           path: /tmp/artifacts
+
+workflows:
+  version: 2
+  lint:
+    jobs:
+      - lint
+  build:
+    jobs:
+      - build:
+          filters:
+            branches:
+              only:
+                - master
+                - website-preview

.markdownlint.yaml

@@ -0,0 +1,97 @@
+comment: 'Rules for PingCAP docs'
+
+# disable all by default
+default: false
+
+# MD001
+heading-increment: true
+
+# MD003
+heading-style:
+  style: atx
+
+# MD009
+no-trailing-spaces: true
+
+# MD010
+no-hard-tabs: true
+
+# MD007
+ul-indent:
+  indent: 4
+
+# MD012
+no-multiple-blanks: true
+
+# commands-show-output: true
+
+# MD018
+no-missing-space-atx: true
+
+# MD019
+no-multiple-space-atx: true
+
+# MD022
+blanks-around-headings: true
+
+# MD023
+heading-start-left: true
+
+# MD024
+no-duplicate-heading:
+  siblings_only: true
+
+# MD025
+single-title:
+  front_matter_title: ''
+
+# MD026
+no-trailing-punctuation:
+  punctuation: '.,;:!。，；：！'
+
+# MD027
+no-multiple-space-blockquote: true
+
+# MD029
+ol-prefix:
+  style: ordered
+
+# MD030
+list-marker-space: true
+
+# MD031
+blanks-around-fences: true
+
+# MD032
+blanks-around-lists: true
+
+# MD034
+no-bare-urls: true
+
+# MD037
+no-space-in-emphasis: true
+
+# MD038
+no-space-in-code: true
+
+# MD039
+no-space-in-links: true
+
+# MD042
+no-empty-links: true
+
+# proper-names:
+#   names: ['TiDB', 'TiKV', 'PingCAP']
+#   code_blocks: false
+
+# MD045
+no-alt-text: true
+
+# MD046
+code-block-style:
+  style: fenced
+
+# single-trailing-newline: true
+
+# MD041
+first-line-heading: true