improve exception display

Cargo.toml

@@ -14,7 +14,7 @@ regex = "1.11.1"
 clap = { version = "4.5.30", features = ["derive"] }
 logsmash-data = { version = "0.1.0", path = "./data" }
 itertools = "0.14.0"
-ratatui = "0.29.0"
+ratatui = { version = "0.29.0", features = ["unstable-rendered-line-info"] }
 tinystr = { version = "0.8.0", features = ["serde"] }
 time = { version = "0.3.37", features = ["serde", "serde-well-known", "parsing", "macros"] }
 hdrhistogram = "7.5.4"

src/ui/single_log.rs

@@ -3,6 +3,7 @@ use crate::ui::style::TABLE_HEADER_STYLE;
 use crate::ui::table::{ScrollbarTable, ScrollbarTableState};
 use ratatui::prelude::*;
 use ratatui::widgets::{Cell, Paragraph, Row, Wrap};
+use std::fmt::Write;
 use std::iter::once;
 
 pub fn single_log(line: &FullLogLine) -> SingleLog {
@@ -52,11 +53,7 @@ impl StatefulWidget for SingleLog<'_> {
 
         let layout = Layout::default()
             .direction(Direction::Vertical)
-            .constraints(vec![
-                Constraint::Min(7),
-                Constraint::Min(5),
-                Constraint::Percentage(100),
-            ])
+            .constraints(vec![Constraint::Min(7), Constraint::Percentage(100)])
             .split(area);
 
         par.render(layout[0], buf);
@@ -65,20 +62,36 @@ impl StatefulWidget for SingleLog<'_> {
             if line.message.contains(&exception.message) {
                 StatefulWidget::render(
                     render_exception(exception, self.path_prefix_length),
-                    layout[1].union(layout[2]),
+                    layout[1],
                     buf,
                     state,
                 );
             } else {
-                let ex_par = Paragraph::new(format!(
-                    "\n{}:\n  {}",
-                    exception.exception, exception.message
-                ))
-                .wrap(Wrap::default());
-                ex_par.render(layout[1], buf);
+                let mut text = format!("\n{}:\n  {}", exception.exception, exception.message);
+                let mut cur = exception;
+                while let Some(previous) = cur.previous.as_deref() {
+                    write!(
+                        &mut text,
+                        "\n\nCaused by {}\n  {}",
+                        previous.exception, previous.message
+                    )
+                    .unwrap();
+                    cur = previous;
+                }
+                let ex_par = Paragraph::new(text).wrap(Wrap::default());
+
+                let ex_layout = Layout::default()
+                    .direction(Direction::Vertical)
+                    .constraints(vec![
+                        Constraint::Min(ex_par.line_count(layout[1].width) as u16 + 1),
+                        Constraint::Percentage(100),
+                    ])
+                    .split(layout[1]);
+
+                ex_par.render(ex_layout[0], buf);
                 StatefulWidget::render(
                     render_exception(exception, self.path_prefix_length),
-                    layout[2],
+                    ex_layout[1],
                     buf,
                     state,
                 );
@@ -123,7 +136,7 @@ fn exception_trace(
                 .unwrap_or_default(),
         ),
         Text::from(exception.line.to_string()).alignment(Alignment::Right),
-        Text::from(""),
+        Text::from(format!("new {}", exception.exception)),
     ])
     .style(TABLE_HEADER_STYLE);
     let trace_rows = exception