MNT Add linting

.editorconfig

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+# For more information about the properties used in
+# this file, please see the EditorConfig documentation:
+# http://editorconfig.org/
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[composer.json]
+indent_size = 4

.eslintrc.js

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+const rules = require('@silverstripe/eslint-config/.eslintrc');
+
+rules.plugins = ['markdown'];
+rules.overrides = [
+  {
+    files: ['**/*.md'],
+    processor: 'markdown/markdown'
+  },
+  {
+    files: ['**/*.md/*.js'],
+    parserOptions: {
+      ecmaFeatures: {
+        impliedStrict: true
+      }
+    },
+    settings: {
+      react: {
+        version: '16'
+      }
+    },
+    rules: {
+      // These rules are not appropriate for linting markdown code blocks
+      'lines-around-comment': 'off',
+      'import/no-unresolved': 'off',
+      'import/extensions': 'off',
+      'react/jsx-no-undef': 'off',
+      'no-undef': 'off',
+      'no-unused-expressions': 'off',
+      'no-unused-vars': 'off',
+      'brace-style': 'off', // it's useful to have comments before the else block
+      // These rules are disabled because they are difficult to adhere to right now
+      'jsx-a11y/label-has-associated-control': 'off',
+      'react/prefer-stateless-function': 'off',
+    }
+  }
+];
+
+module.exports = rules;

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    strategy:
+      # set fail-fast to false prevent one matrix job from cancelling other matrix jobs
+      # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategyfail-fast
+      fail-fast: false
+      matrix:
+        script: [ 'lint-md', 'lint-js', 'lint-php' ]
+    name: ${{ matrix.script }}
+    steps:
+
+      - name: Checkout code
+        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
+
+      - name: Read .nvmrc
+        id: read-nvm
+        run: |
+          NPM_VERSION=$(cat .nvmrc)
+          echo "version=$NPM_VERSION" >> $GITHUB_OUTPUT
+
+      - name: Install NPM
+        uses: actions/setup-node@1a4442cacd436585916779262731d5b162bc6ec7 # v3.8.2
+        with:
+          node-version: ${{ steps.read-nvm.outputs.version }}
+
+      - name: Install yarn dependencies
+        run: |
+          npm install --global yarn
+          yarn install
+
+      - name: Install PHP
+        if: ${{ matrix.script == 'lint-php' }}
+        uses: shivammathur/setup-php@1a18b2267f80291a81ca1d33e7c851fe09e7dfc4 # v2.22.0
+        with:
+          php-version: 8.1
+
+      - name: Install composer dependencies
+        if: ${{ matrix.script == 'lint-php' }}
+        run: composer install --prefer-dist --no-progress --ansi --no-interaction --optimize-autoloader
+
+      - name: Run lint
+        run: yarn ${{ matrix.script }}

.gitignore

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+/node_modules/
+/vendor/
+composer.lock

.markdownlint-cli2.mjs

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+
+import markdownlint from 'markdownlint';
+import enhancedProperNames from 'markdownlint-rule-enhanced-proper-names/src/enhanced-proper-names.js';
+import titleCaseStyle from 'markdownlint-rule-title-case-style';
+import { load } from 'js-yaml';
+
+export default {
+    'customRules': [
+        enhancedProperNames,
+        titleCaseStyle,
+    ],
+    'config': markdownlint.readConfigSync('./.markdownlint.yml', [ load ]),
+};

.markdownlint.yml

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+# Enable all rules with default settings as a baseline
+default: true
+
+# MD041: Ignore the frontmatter (metadata) title when checking for H1s
+first-line-h1:
+  front_matter_title: ''
+
+# MD025: Ignore the frontmatter (metadata) title when checking for H1s
+single-h1:
+  front_matter_title: ''
+
+# MD003: Enforce ATX style headings
+heading-style:
+  style: 'atx'
+
+# MD049: Use asterisks for italics
+emphasis-style:
+  style: 'asterisk'
+
+# MD050: Use asterisks for bold
+strong-style:
+  style: 'asterisk'
+
+# MD004: Use hyphens for unordered lists
+ul-style:
+  style: 'dash'
+
+# MD029: Always use 1. for ordered lists
+ol-prefix:
+  style: 'one'
+
+# MD013: Disable line-length rule for now as it touches too many lines of doc
+line-length: false
+# line_length: 120
+
+# MD010: Use two spaces for each tab (default was 1)
+no-hard-tabs:
+  spaces_per_tab: 2
+
+# MD031: Don't require empty lines after code blocks in lists
+blanks-around-fences:
+  list_items: false
+
+# MD035: Enforce a style for horizontal rules.
+# Hyphens would be confusing since we use those for frontmatter (metadata)
+hr-style:
+  style: '___'
+
+# MD046: Don't allow indented codeblocks
+code-block-style:
+  style: 'fenced'
+
+# MD048: Use backticks for codeblocks
+code-fence-style:
+  style: 'backtick'
+
+# MD040: Explicitly only allow some languages for code blocks
+# This helps with consistency (e.g. avoid having both yml and yaml)
+fenced-code-language:
+  language_only: true
+  allowed_languages:
+    - 'bash' # use this instead of shell or env
+    - 'css'
+    - 'diff'
+    - 'graphql'
+    - 'html'
+    - 'js'
+    - 'json'
+    - 'php'
+    - 'scss'
+    - 'ss'
+    - 'sql'
+    - 'text'
+    - 'xml'
+    - 'yml'
+
+# MD044: Disable in favour of the enhanced version which ignores custom anchors for headings
+# markdownlint-rule-enhanced-proper-names: Enforces capitalisation for specific names
+proper-names: off
+enhanced-proper-names:
+  code_blocks: false
+  heading_id: false
+  names:
+    - 'API'
+    - 'type/api-break' # the GitHub label
+    - 'CI'
+    - 'CMS'
+    - '/cms' # e.g. "silverstripe/cms"
+    - '-cms' # e.g. "silverstripe/recipe-cms"
+    - 'CSS'
+    - 'GitHub'
+    - 'GraphQL'
+    - '/graphql' # e.g. "silverstripe/graphql"
+    - 'HTTP'
+    - 'JavaScript'
+    - 'JS'
+    - '.js' # e.g. "Node.js"
+    - 'jQuery'
+    - 'ORM'
+    - 'PHP'
+    - 'php-' # e.g. "php-intl extension"
+    - 'SCSS'
+    - 'Silverstripe'
+    - 'silverstripe/' # e.g. "silverstripe/framework"
+    - 'silverstripe-' # e.g. "silverstripe-vendormodule"
+    - '@silverstripe.org'
+    - 'TinyMCE'
+    - 'UI'
+    - 'URL'
+    - 'YAML'
+
+# markdownlint-rule-title-case-style: Use sentence-style headings
+title-case-style:
+  case: 'sentence'
+  # commas in the following list are intentional and necessary since the plugin makes no distinction
+  # between words and punctuation
+  ignore:
+    - 'Apache'
+    - 'APIs'
+    - 'Composer'
+    - 'GitHub'
+    - 'GraphQL'
+    - 'Huntr'
+    - 'JavaScript'
+    - 'I'
+    - 'InnoDB'
+    - 'Git'
+    - 'jQuery'
+    - 'jQuery,'
+    - 'Lighttpd'
+    - 'MyISAM'
+    - 'MySQL'
+    - 'Nginx'
+    - 'Nginx,'
+    - 'PHPUnit'
+    - 'RFCs'
+    - 'Silverstripe'
+    - 'TinyMCE'
+    - 'Transifex'
+    - 'URLs'
+    - 'WebP'
+
+# MD033: Allow specific HTML tags
+no-inline-html:
+  allowed_elements:
+    # br is necessary for new lines in tables
+    - 'br'
+    # accordians are okay
+    - 'details'
+    - 'summary'
+    # description lists are okay
+    - 'dl'
+    - 'dd'
+    - 'dt'

.nvmrc

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+18

composer.json

@@ -19,5 +19,14 @@
             "name": "The SilverStripe Community",
             "homepage": "http://silverstripe.org"
         }
-    ]
+    ],
+    "require-dev": {
+        "silverstripe/markdown-php-codesniffer": "^1",
+        "slevomat/coding-standard": "^8.14"
+    },
+    "config": {
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true
+        }
+    }
 }