One SID per file

src/main/java/com/rusefi/can/analysis/ByteRateOfChange.java

@@ -53,7 +53,11 @@ public class ByteRateOfChange {
     }
 
     public static String dualSid(int sid) {
-        return String.format("%d/0x%x", sid, sid);
+        return dualSid(sid, "/");
+    }
+
+    public static String dualSid(int sid, String separator) {
+        return String.format("%d%s0x%x", sid, separator, sid);
     }
 
     public static class ByteStatistics {

src/main/java/com/rusefi/can/analysis/PerSidDump.java

@@ -1,12 +1,19 @@
 package com.rusefi.can.analysis;
 
 import com.rusefi.can.CANPacket;
+import com.rusefi.can.writer.SteveWriter;
 
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintWriter;
 import java.util.List;
 import java.util.TreeSet;
 
+import static com.rusefi.can.analysis.ByteRateOfChange.dualSid;
+
 public class PerSidDump {
-    public static void handle(List<CANPacket> packets, String simpleFileName) {
+    public static void handle(List<CANPacket> packets, String simpleFileName) throws IOException {
         TreeSet<Integer> sids = new TreeSet<>();
         // todo: one day I will let streams into my heart
         for (CANPacket packet : packets)
@@ -14,10 +21,19 @@ public class PerSidDump {
 
         // O(n*M) is not so bad
         for (int sid : sids) {
+
+            PrintWriter pw = new PrintWriter(new FileOutputStream(simpleFileName + "_filtered_" + dualSid(sid, "_") + ".txt"));
+
             for (CANPacket packet : packets) {
                 if (packet.getId() != sid)
                     continue;
+
+                // no reason to use SteveWriter just need any human-readable writer here
+                SteveWriter.append(pw, packet);
+
+
             }
+            pw.close();
         }
 
     }

src/main/java/com/rusefi/can/writer/SteveWriter.java

@@ -6,6 +6,9 @@ import java.io.FileWriter;
 import java.io.IOException;
 import java.util.List;
 
+/**
+ * This seems to be about https://github.com/brent-stone/CAN_Reverse_Engineering
+ */
 public class SteveWriter implements CANTextWriter {
     private final String fileName;