refactor: Update FilterPlugin methods to use boxed Read/Write traits

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/filter_plugin/head.rs

@@ -15,7 +15,7 @@ impl HeadBytesFilter {
 }
 
 impl FilterPlugin for HeadBytesFilter {
-    fn filter<R: Read, W: Write>(&mut self, reader: &mut R, writer: &mut W) -> Result<()> {
+    fn filter(&mut self, reader: Box<&mut dyn Read>, writer: Box<&mut dyn Write>) -> Result<()> {
         if self.remaining == 0 {
             return Ok(());
         }
@@ -47,13 +47,13 @@ impl HeadLinesFilter {
 }
 
 impl FilterPlugin for HeadLinesFilter {
-    fn filter<R: Read, W: Write>(&mut self, reader: &mut R, writer: &mut W) -> Result<()> {
+    fn filter(&mut self, reader: Box<&mut dyn Read>, writer: Box<&mut dyn Write>) -> Result<()> {
         if self.remaining == 0 {
             return Ok(());
         }
         
-        let buf_reader = std::io::BufReader::new(reader);
-        for line in buf_reader.lines() {
+        let mut buf_reader = std::io::BufReader::new(reader);
+        for line in buf_reader.by_ref().lines() {
             let line = line?;
             writeln!(writer, "{}", line)?;
             self.remaining -= 1;

src/filter_plugin/skip.rs

@@ -15,7 +15,7 @@ impl SkipBytesFilter {
 }
 
 impl FilterPlugin for SkipBytesFilter {
-    fn filter<R: Read, W: Write>(&mut self, reader: &mut R, writer: &mut W) -> Result<()> {
+    fn filter(&mut self, reader: Box<&mut dyn Read>, writer: Box<&mut dyn Write>) -> Result<()> {
         // Skip bytes in chunks
         if self.remaining > 0 {
             let mut buffer = vec![0; PIPESIZE];
@@ -30,7 +30,8 @@ impl FilterPlugin for SkipBytesFilter {
         }
         
         // Copy the remaining data using io::copy for efficiency
-        std::io::copy(reader, writer)
+        std::io::copy(&mut *reader, &mut *writer)?;
+        Ok(())
     }
 }
 
@@ -47,9 +48,9 @@ impl SkipLinesFilter {
 }
 
 impl FilterPlugin for SkipLinesFilter {
-    fn filter<R: Read, W: Write>(&mut self, reader: &mut R, writer: &mut W) -> Result<()> {
-        let buf_reader = std::io::BufReader::new(reader);
-        for line in buf_reader.lines() {
+    fn filter(&mut self, reader: Box<&mut dyn Read>, writer: Box<&mut dyn Write>) -> Result<()> {
+        let mut buf_reader = std::io::BufReader::new(reader);
+        for line in buf_reader.by_ref().lines() {
             let line = line?;
             if self.remaining > 0 {
                 self.remaining -= 1;

src/filter_plugin/tail.rs

@@ -18,7 +18,7 @@ impl TailBytesFilter {
 }
 
 impl FilterPlugin for TailBytesFilter {
-    fn filter<R: Read, W: Write>(&mut self, reader: &mut R, writer: &mut W) -> Result<()> {
+    fn filter(&mut self, reader: Box<&mut dyn Read>, writer: Box<&mut dyn Write>) -> Result<()> {
         let mut temp_buffer = vec![0; PIPESIZE];
         loop {
             let bytes_read = reader.read(&mut temp_buffer)?;
@@ -57,9 +57,9 @@ impl TailLinesFilter {
 }
 
 impl FilterPlugin for TailLinesFilter {
-    fn filter<R: Read, W: Write>(&mut self, reader: &mut R, writer: &mut W) -> Result<()> {
-        let buf_reader = std::io::BufReader::new(reader);
-        for line in buf_reader.lines() {
+    fn filter(&mut self, reader: Box<&mut dyn Read>, writer: Box<&mut dyn Write>) -> Result<()> {
+        let mut buf_reader = std::io::BufReader::new(reader);
+        for line in buf_reader.by_ref().lines() {
             let line = line?;
             if self.lines.len() == self.count {
                 self.lines.pop_front();