Add psalm

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

.github/workflows/static-analysis.yml

@@ -0,0 +1,26 @@
+name: Static analysis
+
+on: [pull_request]
+
+jobs:
+  static-psalm-analysis:
+      runs-on: ubuntu-latest
+      strategy:
+          matrix:
+              ocp-version: [ 'dev-master' ]
+      name: Nextcloud ${{ matrix.ocp-version }}
+      steps:
+          - name: Checkout
+            uses: actions/checkout@v3
+          - name: Set up php
+            uses: shivammathur/setup-php@v2
+            with:
+                php-version: 7.4
+                tools: composer:v1
+                coverage: none
+          - name: Install dependencies
+            run: composer i
+          - name: Install dependencies
+            run: composer require --dev christophwurst/nextcloud:${{ matrix.ocp-version }}
+          - name: Run coding standards check
+            run: composer run psalm

composer.json

@@ -25,9 +25,14 @@
   "scripts": {
     "cs:check": "php-cs-fixer fix --dry-run --diff",
     "cs:fix": "php-cs-fixer fix",
-    "lint": "find . -name \\*.php -not -path './vendor/*' -print0 | xargs -0 -n1 php -l"
+    "lint": "find . -name \\*.php -not -path './vendor/*' -print0 | xargs -0 -n1 php -l",
+    "psalm": "psalm --threads=1 --update-baseline",
+    "psalm:update-baseline": "psalm --threads=1 --update-baseline",
+    "psalm:clear": "psalm --clear-cache && psalm --clear-global-cache",
+    "psalm:fix": "psalm --alter --issues=InvalidReturnType,InvalidNullableReturnType,MissingParamType,InvalidFalsableReturnType"
   },
   "require-dev": {
+    "vimeo/psalm": "^4.24",
     "nextcloud/coding-standard": "^0.5.0",
     "phpunit/phpunit": "^9.5"
   }