fix: allow Logger variable {line} to be used without variable {file}

Author: michalsn

system/Log/Logger.php

@@ -341,7 +341,7 @@ protected function interpolate($message, array $context = [])
         $replace['{env}']       = ENVIRONMENT;
 
         // Allow us to log the file/line that we are logging from
-        if (str_contains($message, '{file}')) {
+        if (str_contains($message, '{file}') || str_contains($message, '{line}')) {
             [$file, $line] = $this->determineFile();
 
             $replace['{file}'] = $file;

tests/system/Log/LoggerTest.php

@@ -236,6 +236,23 @@ public function testLogInterpolatesFileAndLine(): void
         $this->assertGreaterThan(1, strpos($logs[0], $expected));
     }
 
+    public function testLogInterpolatesLineOnly(): void
+    {
+        $config = new LoggerConfig();
+
+        $logger = new Logger($config);
+
+        $_ENV['foo'] = 'bar';
+
+        $logger->log('debug', 'Test message Sample {line}');
+        $line     = __LINE__ - 1;
+        $expected = "Sample {$line}";
+
+        $logs = TestHandler::getLogs();
+
+        $this->assertGreaterThan(1, strpos($logs[0], $expected));
+    }
+
     public function testLogInterpolatesExceptions(): void
     {
         $config = new LoggerConfig();