feat: add read time and read rate meta plugins

Co-authored-by: aider (openai/andrew.openrouter.qwen.qwen3-coder) <aider@aider.chat>

src/meta_plugin/digest.rs

@@ -2,6 +2,7 @@ use anyhow::Result;
 use sha2::{Digest, Sha256};
 use std::io;
 use std::io::Write;
+use std::time::Instant;
 
 use crate::meta_plugin::MetaPlugin;
 
@@ -39,7 +40,6 @@ impl MetaPlugin for DigestSha256MetaPlugin {
     fn meta_name(&mut self) -> String {
         self.meta_name.clone()
     }
-
 }
 
 // Dummy writer that implements Write but doesn't do anything
@@ -55,3 +55,93 @@ impl Write for DummyWriter {
         Ok(())
     }
 }
+
+#[derive(Debug, Clone, Default)]
+pub struct ReadTimeMetaPlugin {
+    start_time: Option<Instant>,
+    meta_name: String,
+}
+
+impl ReadTimeMetaPlugin {
+    pub fn new() -> ReadTimeMetaPlugin {
+        ReadTimeMetaPlugin {
+            start_time: None,
+            meta_name: "read_time".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for ReadTimeMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        // For meta plugins, we don't actually create a writer since we're buffering data internally
+        Ok(Box::new(DummyWriter))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        if let Some(start_time) = self.start_time {
+            let duration = start_time.elapsed();
+            Ok(format!("{:.6}", duration.as_secs_f64()))
+        } else {
+            Ok("0.000000".to_string())
+        }
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        if self.start_time.is_none() {
+            self.start_time = Some(Instant::now());
+        }
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct ReadRateMetaPlugin {
+    start_time: Option<Instant>,
+    bytes_read: u64,
+    meta_name: String,
+}
+
+impl ReadRateMetaPlugin {
+    pub fn new() -> ReadRateMetaPlugin {
+        ReadRateMetaPlugin {
+            start_time: None,
+            bytes_read: 0,
+            meta_name: "read_rate".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for ReadRateMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        // For meta plugins, we don't actually create a writer since we're buffering data internally
+        Ok(Box::new(DummyWriter))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        if let Some(start_time) = self.start_time {
+            let duration = start_time.elapsed();
+            if duration.as_secs_f64() > 0.0 {
+                let rate = self.bytes_read as f64 / duration.as_secs_f64();
+                Ok(format!("{:.0}", rate))
+            } else {
+                Ok("0".to_string())
+            }
+        } else {
+            Ok("0".to_string())
+        }
+    }
+
+    fn update(&mut self, data: &[u8]) {
+        if self.start_time.is_none() {
+            self.start_time = Some(Instant::now());
+        }
+        self.bytes_read += data.len() as u64;
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}