Add flutter.log to default error submitter

Author: helin24

src/io/flutter/FlutterErrorReportSubmitter.java

@@ -9,6 +9,7 @@
 import com.intellij.ide.plugins.IdeaPluginDescriptor;
 import com.intellij.ide.plugins.PluginManagerCore;
 import com.intellij.ide.scratch.ScratchRootType;
+import com.intellij.openapi.application.PathManager;
 import com.intellij.openapi.actionSystem.DataContext;
 import com.intellij.openapi.application.ApplicationInfo;
 import com.intellij.openapi.diagnostic.ErrorReportSubmitter;
@@ -26,10 +27,13 @@
 import org.jetbrains.annotations.Nullable;
 
 import java.awt.*;
+import java.io.File;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.util.List;
 import java.util.concurrent.TimeUnit;
 
 import static com.intellij.openapi.actionSystem.CommonDataKeys.PROJECT;
@@ -176,6 +180,29 @@ public boolean submit(@NotNull IdeaLoggingEvent @NotNull [] events,
       builder.append("\n");
     }
 
+    builder.append("## Flutter log\n\n");
+    builder.append("```\n");
+    try {
+      final String logPath = PathManager.getLogPath();
+      final File logFile = new File(logPath, "flutter.log");
+      if (logFile.exists()) {
+        final List<String> lines = Files.readAllLines(logFile.toPath(), StandardCharsets.UTF_8);
+        final int count = 200;
+        final int start = Math.max(0, lines.size() - count);
+        if (start > 0) {
+          builder.append("...\n");
+        }
+        for (int i = start; i < lines.size(); i++) {
+          builder.append(lines.get(i)).append("\n");
+        }
+      } else {
+        builder.append("(flutter.log not found)\n");
+      }
+    } catch (Exception ex) {
+      builder.append("(exception trying to read log: ").append(ex.getMessage()).append(")\n");
+    }
+    builder.append("```\n\n");
+
     final String text = builder.toString().trim() + "\n";
 
     // Create scratch file.