Fix empty line spam in log file when Wine crashes

CHANGELOG.md

@@ -14,6 +14,8 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ### Fixed
 
+- Fixed large amount of empty lines in the log file when the Wine process closes
+  unexpectedly.
 - Made the plugin and host detection slightly more robust.
 
 ## [1.1.4] - 2020-05-12

src/plugin/plugin-bridge.cpp

@@ -612,16 +612,19 @@ void PluginBridge::async_log_pipe_lines(patched_async_pipe& pipe,
                                         boost::asio::streambuf& buffer,
                                         std::string prefix) {
     boost::asio::async_read_until(
-        pipe, buffer, '\n', [&, prefix](const auto&, size_t) {
+        pipe, buffer, '\n',
+        [&, prefix](const boost::system::error_code& error, size_t) {
+            // When we get an error code then that likely means that the pipe
+            // has been clsoed and we have reached the end of the file
+            if (error.failed()) {
+                return;
+            }
+
             std::string line;
             std::getline(std::istream(&buffer), line);
             logger.log(prefix + line);
 
-            // Not sure why, but this async read will keep reading a ton of
+            async_log_pipe_lines(pipe, buffer, prefix);
-            // empty lines after the Wine process crashes
-            if (vst_host.running()) {
-                async_log_pipe_lines(pipe, buffer, prefix);
-            }
         });
 }