GH Actions: switch over to parallel linting of PHP files

.github/workflows/basics.yml

@@ -26,9 +26,6 @@ jobs:
           coverage: none
           tools: cs2pr
 
-      - name: 'Lint PHP against parse errors'
-        run: ./bin/php-lint
-
       - name: Install xmllint
         run: sudo apt-get install --no-install-recommends -y libxml2-utils
 

.github/workflows/test.yml

@@ -11,7 +11,45 @@ on:
   workflow_dispatch:
 
 jobs:
+  #### PHP LINT STAGE ####
+  # Linting against high/low PHP versions should catch everything.
+  # If needs be, we can always add interim versions at a later point in time.
+  lint:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php: ['5.4', 'latest']
+        experimental: [false]
+
+        include:
+          - php: '8.1'
+            experimental: true
+
+    name: "Lint: PHP ${{ matrix.php }}"
+    continue-on-error: ${{ matrix.experimental }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+          tools: cs2pr
+
+      - name: Install Composer dependencies
+        uses: "ramsey/composer-install@v1"
+
+      - name: Lint against parse errors
+        run: ./bin/php-lint --checkstyle | cs2pr
+
   test:
+    # No use running the tests if there is a linting error somewhere as they would fail anyway.
+    needs: lint
+
     runs-on: ubuntu-latest
 
     strategy:

bin/php-lint

@@ -2,21 +2,9 @@
 #
 # Lint the PHP files against parse errors.
 #
-# The find utility recursively descends the directory tree for each path listed.
-#
-# find . = Start with all files in this package
-# -path ./vendor -prune = But remove those in the vendor directory
-# -o -path ./bin -prune = And remove those in the bin directory
-# -o -path ./.git -prune = And remove those in the .git directory
-# -o -name "*.php" = And only consider those with a .php extension
-# -exec php -l {} = Run PHP linter on the remaining files
-# | grep "^[Parse error|Fatal error]" = Look in the results for any parse or fatal errors.
-#
 # EXAMPLE TO RUN LOCALLY:
 #
 #   ./bin/php-lint
 #
 
-if find . -path ./vendor -prune -o -path ./bin -prune -o -path ./.git -prune -o -name "*.php" -exec php -l -f {} \; | grep "^[Errors parsing]"; then
-    exit 1;
-fi
+"$(pwd)/vendor/bin/parallel-lint" . -e php --exclude vendor --exclude .git $@

composer.json

@@ -22,6 +22,8 @@
 		"wp-coding-standards/wpcs": "^2.3"
 	},
 	"require-dev": {
+		"php-parallel-lint/php-parallel-lint": "^1.0",
+		"php-parallel-lint/php-console-highlighter": "^0.5",
 		"phpcompatibility/php-compatibility": "^9",
 		"phpunit/phpunit": "^4 || ^5 || ^6 || ^7"
 	},