more reworking bar + new log format

src/bin/record.rs

@@ -0,0 +1,27 @@
+use core::time;
+use std::{
+    fs::File,
+    io::{BufRead, BufReader, Write},
+    time::{Instant, SystemTime},
+};
+
+fn main() -> Result<(), color_eyre::Report> {
+    color_eyre::install().unwrap();
+    let stderr = std::io::stdin();
+    let mut lines = BufReader::new(stderr).lines();
+    let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
+    let mut file = File::options()
+        .create_new(true)
+        .write(true)
+        .truncate(true)
+        .open(format!("{}.log", now.as_secs()))?;
+
+    let start = Instant::now();
+    while let Some(Ok(next)) = lines.next() {
+        let line = format!("{}~{next}\n", start.elapsed().as_millis());
+        file.write_all(line.as_bytes())?;
+    }
+    file.flush()?;
+
+    Ok(())
+}