feat(record): render newline characters

In principle, we can now support recording words rather than lines (although it doesn't render that well).

scm-record/src/ui.rs

@@ -2589,6 +2589,7 @@ impl Component for SectionLineView<'_> {
  }
 
  fn draw(&self, viewport: &mut Viewport<Self::Id>, x: isize, y: isize) {
+ const NEWLINE_ICON: &str = "⏎";
  let Self { line_key: _, inner } = self;
  viewport.fill_rest_of_line(x, y);
  match inner {
@@ -2599,11 +2600,24 @@ impl Component for SectionLineView<'_> {
  // lines.
  let line_num_rect =
  viewport.draw_span(x, y, &Span::styled(format!("{line_num:5} "), style));
- viewport.draw_span(
+ let (line, line_end) = match line.strip_suffix('\n') {
+ Some(line) => (
+ Span::styled(line, style),
+ Some(Span::styled(
+ NEWLINE_ICON,
+ Style::default().fg(Color::DarkGray),
+ )),
+ ),
+ None => (Span::styled(*line, style), None),
+ };
+ let line_rect = viewport.draw_span(
  line_num_rect.x + line_num_rect.width.unwrap_isize(),
  line_num_rect.y,
- &Span::styled(*line, style),
+ &line,
  );
+ if let Some(line_end) = line_end {
+ viewport.draw_span(line_rect.x + line_rect.width.unwrap_isize(), y, &line_end);
+ }
  }
 
  SectionLineViewInner::Changed {
@@ -2620,7 +2634,20 @@ impl Component for SectionLineView<'_> {
  };
  viewport.draw_span(x, y, &Span::styled(change_type_text, style));
  let x = x + change_type_text.width().unwrap_isize();
- viewport.draw_span(x, y, &Span::styled(*line, style));
+ let (line, line_end) = match line.strip_suffix('\n') {
+ Some(line) => (
+ Span::styled(line, style),
+ Some(Span::styled(
+ NEWLINE_ICON,
+ Style::default().fg(Color::DarkGray),
+ )),
+ ),
+ None => (Span::styled(*line, style), None),
+ };
+ let line_rect = viewport.draw_span(x, y, &line);
+ if let Some(line_end) = line_end {
+ viewport.draw_span(line_rect.x + line_rect.width.unwrap_isize(), y, &line_end);
+ }
  }
  }
  }