ci: Add GitHub Actions workflow

.envrc

@@ -0,0 +1 @@
+use nix

.github/workflows/main.yaml

@@ -0,0 +1,65 @@
+# This file lints the code and runs tests.
+name: CI
+
+on:
+  pull_request:
+  push:
+
+env:
+  COMPOSER_FLAGS: "--ansi --no-interaction --no-progress --no-suggest --prefer-dist"
+
+jobs:
+  tests:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        php:
+          - '8.0'
+          - '7.4'
+          - '7.3'
+          - '7.2'
+          - '7.1'
+          - '7.0'
+          - '5.6'
+        include:
+          - php: '7.0'
+            cs_fixer: true
+    name: 'Check with PHP ${{ matrix.php }}'
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v12
+
+      - name: Set up Nix cache
+        uses: cachix/cachix-action@v8
+        with:
+          # Use cache from https://github.com/fossar/nix-phps
+          name: fossar
+
+      - name: Update flake.nix to match the current CI job from matrix
+        run: sed -i 's/matrix.phpPackage = "php";/matrix.phpPackage = builtins.replaceStrings ["."] [""] "php${{ matrix.php }}";/' flake.nix
+
+      - name: Get Composer Cache Directory
+        id: composer-cache
+        run: |
+          echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - uses: actions/cache@v2
+        env:
+          cache-name: cache-composer-modules
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: nix-shell --run 'composer install'
+
+      - name: Lint source code
+        if: matrix.cs_fixer
+        run: nix-shell --run 'composer cs-check'
+
+      - name: Run unit tests
+        run: nix-shell --run 'composer test'

composer.json

@@ -21,7 +21,14 @@
         "symfony/phpunit-bridge": "^5.2",
         "friendsofphp/php-cs-fixer": "~2.17"
     },
-    "config": {
-        "bin-dir": "bin"
+    "scripts": {
+        "cs-check": "php-cs-fixer fix --verbose --dry-run --diff",
+        "cs-fix": "php-cs-fixer fix --verbose --diff",
+        "test": "simple-phpunit --verbose --bootstrap test/test-init.php test/WideImage"
+    },
+    "scripts-descriptions": {
+        "cs-check": "Check coding style",
+        "cs-fix": "Fix coding style",
+        "test": "Run all tests"
     }
 }

flake.nix

@@ -0,0 +1,40 @@
+{
+  description = "An open-source PHP library for image manipulation";
+
+  inputs = {
+    # For old PHP versions.
+    phps.url = "github:fossar/nix-phps";
+  };
+
+  outputs = { self, phps }:
+    let
+      # nixpkgs is a repository with software packages and some utilities.
+      # From simplicity, we inherit it from the phps flake.
+      inherit (phps.inputs) nixpkgs;
+
+      # Configure the development shell here (e.g. for CI).
+
+      # By default, we use the default PHP version from Nixpkgs.
+      matrix.phpPackage = "php";
+    in
+      let
+        # We only support a single platform at the moment,
+        # since our binary cache only contains PHP packages for that.
+        system = "x86_64-linux";
+
+        # Get Nixpkgs packages for current platform.
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        # Create a PHP package from the selected PHP package.
+        php = phps.packages.${system}.${matrix.phpPackage};
+      in {
+        # Expose shell environment for development.
+        devShell.${system} = pkgs.mkShell {
+          nativeBuildInputs = [
+            # Composer and PHP.
+            php
+            php.packages.composer
+          ];
+        };
+      };
+}

lib/TrueColorImage.php

@@ -275,8 +275,7 @@ public function resizeInsideRect(
         $alignTop = 'center',
         $mergeOpacity = 100,
         $fillColor = null
-    )
-    {
+    ) {
         if ($fillColor) {
             if (is_numeric($fillColor)) {
                 $fillColor = $this->getColorRGB($fillColor);

shell.nix

@@ -0,0 +1,9 @@
+(import (
+  let
+    lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+  in fetchTarball {
+    url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+    sha256 = lock.nodes.flake-compat.locked.narHash; }
+) {
+  src =  ./.;
+}).shellNix