Added linters.

.github/workflows/lint.yaml

@@ -0,0 +1,74 @@
+name: Lint
+on: [pull_request]
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '7.4'
+          tools: composer
+          coverage: none
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache PHP dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Cache node modules
+        id: cache
+        uses: actions/cache@v2
+        env:
+          cache-name: cache-node-modules
+        with:
+          path: node_modules
+          key: node_modules-${{ hashFiles('**/package-lock.json') }}
+
+      - name: Install PHP dependencies
+        run: composer install --prefer-dist
+
+      - name: Install JS dependencies
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: npm install
+
+      - name: Install reviewdog
+        uses: reviewdog/action-setup@v1
+        with:
+          reviewdog_version: latest
+
+      - name: Lint styles
+        uses: reviewdog/action-stylelint@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          reporter: github-pr-review
+          stylelint_input: '**/*.scss'
+          fail_on_error: true
+        if: always()
+
+      - name: Lint scripts
+        uses: reviewdog/action-eslint@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          reporter: github-pr-review
+          fail_on_error: true
+        if: always()
+
+      - name: Lint PHP
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: php ./vendor/bin/phpcs --report=diff -- $(git diff --name-only --diff-filter=ACMR origin/master | grep \\.php | xargs) | sed -r 's/[[:cntrl:]]\[[0-9]{1,3}m//g' | sed -E 's/--- (.+)$/\0\n+++ \1/g; /\+\+\+ PHP_CodeSniffer$/d' | reviewdog -f=diff -f.diff.strip=0 -name=phpcs -reporter=github-pr-review -filter-mode=nofilter -fail-on-error
+        if: always()

.gitignore

@@ -1 +1,5 @@
-/node_modules/*
+node_modules
+vendor
+
+.eslintcache
+.stylelintcache

.husky/pre-commit

@@ -0,0 +1,4 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+npx lint-staged

composer.json

@@ -11,5 +11,20 @@
     "require": {
         "php": ">=7.0.0",
         "composer/installers": "^1"
+    },
+    "repositories": [
+        {
+            "type": "vcs",
+            "url": "https://github.com/netzstrategen/phpcs-config.git"
+        }
+    ],
+    "require-dev": {
+        "netzstrategen/phpcs-config": "dev-main",
+        "dealerdirect/phpcodesniffer-composer-installer": "^0.7.1"
+    },
+    "scripts": {
+        "post-install-cmd": [
+            "cp ./vendor/netzstrategen/phpcs-config/phpcs.xml ."
+        ]
     }
 }