Add support for absolute plugin paths.

docs/authoring_plugins.md

@@ -24,12 +24,19 @@ Here are a couple of example plugins:
  - [FunctionCasingChecker](https://github.com/vimeo/psalm/blob/master/examples/plugins/FunctionCasingChecker.php) - checks that your functions and methods are correctly-cased
 
 To ensure your plugin runs when Psalm does, add it to your [config](configuration.md):
-```php
+```xml
     <plugins>
         <plugin filename="src/plugins/SomePlugin.php" />
     </plugins>
 ```
 
+You can also specify an absolute path to your plugin:
+```xml
+    <plugins>
+        <plugin filename="/path/to/SomePlugin.php" />
+    </plugins>
+```
+
 ## Type system
 
 Understand how Psalm handles types by [reading this guide](plugins_type_system.md).

phpunit.xml.dist

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/5.7/phpunit.xsd"
-         bootstrap="vendor/autoload.php"
+         bootstrap="tests/bootstrap.php"
          backupGlobals="false"
          beStrictAboutCoversAnnotation="true"
          beStrictAboutOutputDuringTests="true"

src/Psalm/Config.php

@@ -792,9 +792,11 @@ public static function loadFromXML($base_dir, $file_contents)
             if (isset($config_xml->plugins->plugin)) {
                 /** @var \SimpleXMLElement $plugin */
                 foreach ($config_xml->plugins->plugin as $plugin) {
-                    $plugin_file_name = $plugin['filename'];
+                    $plugin_file_name = (string) $plugin['filename'];
 
-                    $path = $config->base_dir . $plugin_file_name;
+                    $path = isAbsolutePath($plugin_file_name)
+                        ? $plugin_file_name
+                        : $config->base_dir . $plugin_file_name;
 
                     $config->addPluginPath($path);
                 }

src/command_functions.php

@@ -220,3 +220,32 @@ function getPathsToCheck($f_paths)
 
     return $paths_to_check;
 }
+
+/**
+ * @param string $path
+ *
+ * @return bool
+ */
+function isAbsolutePath($path)
+{
+    // Optional wrapper(s).
+    $regex = '%^(?<wrappers>(?:[[:print:]]{2,}://)*)';
+
+    // Optional root prefix.
+    $regex .= '(?<root>(?:[[:alpha:]]:/|/)?)';
+
+    // Actual path.
+    $regex .= '(?<path>(?:[[:print:]]*))$%';
+
+    $parts = [];
+
+    if (!preg_match($regex, $path, $parts)) {
+        throw new InvalidArgumentException(sprintf('Path is not valid, "%s" given.', $path));
+    }
+
+    if ('' !== $parts['root']) {
+        return true;
+    }
+
+    return false;
+}

tests/IsAbsolutePathTest.php

@@ -0,0 +1,36 @@
+<?php
+namespace Psalm\Tests;
+
+class IsAbsolutePathTest extends TestCase
+{
+    /**
+     * @param string $path
+     * @param bool $expected
+     *
+     * @return void
+     *
+     * @dataProvider providerForTestIsAbsolutePath
+     */
+    public function testIsAbsolutePath($path, $expected)
+    {
+        require_once __DIR__.'/../src/command_functions.php';
+
+        self::assertSame($expected, isAbsolutePath($path));
+    }
+
+    /**
+     * @return array<int, array{0:string, 1:bool}>
+     */
+    public function providerForTestIsAbsolutePath()
+    {
+        return [
+            ['/path/to/something', true],
+            ['/path/to/something/file.php', true],
+            ['relative/path/to/something', false],
+            ['relative/path/to/something/file.php', false],
+            ['c:/path/to/something', true],
+            ['file://c:/path/to/something', true],
+            ['zlib://c:/path/to/something', true],
+        ];
+    }
+}

tests/PluginTest.php

@@ -770,4 +770,59 @@ public function testAfterAnalysisHooks()
         $this->project_analyzer->check('tests/DummyProject', true);
         \Psalm\IssueBuffer::finish($this->project_analyzer, true, microtime(true));
     }
+
+    /**
+     * @return void
+     */
+    public function testPluginFilenameCanBeAbsolute()
+    {
+        $this->project_analyzer = $this->getProjectAnalyzerWithConfig(
+            TestConfig::loadFromXML(
+                dirname(__DIR__) . DIRECTORY_SEPARATOR,
+                sprintf(
+                    '<?xml version="1.0"?>
+                    <psalm>
+                        <projectFiles>
+                            <directory name="src" />
+                        </projectFiles>
+                        <plugins>
+                            <plugin filename="%s/examples/plugins/StringChecker.php" />
+                        </plugins>
+                    </psalm>',
+                    __DIR__.'/..'
+                )
+            )
+        );
+
+        $this->project_analyzer->getCodebase()->config->initializePlugins($this->project_analyzer);
+    }
+
+    /**
+     * @expectedException InvalidArgumentException
+     * @expectedExceptionMessage does-not-exist/plugins/StringChecker.php
+     *
+     * @return void
+     */
+    public function testPluginInvalidAbsoluteFilenameThrowsException()
+    {
+        $this->project_analyzer = $this->getProjectAnalyzerWithConfig(
+            TestConfig::loadFromXML(
+                dirname(__DIR__) . DIRECTORY_SEPARATOR,
+                sprintf(
+                    '<?xml version="1.0"?>
+                    <psalm>
+                        <projectFiles>
+                            <directory name="src" />
+                        </projectFiles>
+                        <plugins>
+                            <plugin filename="%s/does-not-exist/plugins/StringChecker.php" />
+                        </plugins>
+                    </psalm>',
+                    __DIR__.'/..'
+                )
+            )
+        );
+
+        $this->project_analyzer->getCodebase()->config->initializePlugins($this->project_analyzer);
+    }
 }

tests/bootstrap.php

@@ -1,13 +1,5 @@
 <?php
 
-ini_set('display_startup_errors', '1');
-ini_set('html_errors', '1');
-ini_set('memory_limit', '-1');
-error_reporting(E_ALL);
+require_once(__DIR__.'/../src/command_functions.php');
 
-foreach ([__DIR__ . '/../../../autoload.php', __DIR__ . '/../vendor/autoload.php'] as $file) {
-    if (file_exists($file)) {
-        require $file;
-        break;
-    }
-}
+return require_once(__DIR__.'/../vendor/autoload.php');