Function truncate_line

crates/openshell-tui/src/ui/sandbox_logs.rs:250–284

Truncate a span list to fit within `max_width` characters, appending `…` if needed.

(
    spans: Vec<Span<'a>>,
    max_width: usize,
    t: &'a crate::theme::Theme,
)

/// Truncate a span list to fit within `max_width` characters, appending `…` if needed.
fn truncate_line<'a>(
    spans: Vec<Span<'a>>,
    max_width: usize,
    t: &'a crate::theme::Theme,
) -> Line<'a> {
    if max_width == 0 {
        return Line::from(spans);
    }

    let mut used = 0usize;
    let mut out: Vec<Span<'_>> = Vec::with_capacity(spans.len());

    for span in spans {
        let content_len = span.content.len();
        if used + content_len <= max_width {
            out.push(span);
            used += content_len;
        } else {
            // Partial fit — take what we can and append ellipsis.
            let remaining = max_width.saturating_sub(used);
            if remaining > 1 {
                // Find a safe UTF-8 boundary.
                let truncated = safe_truncate(&span.content, remaining - 1);
                let mut s = truncated.to_string();
                s.push('…');
                out.push(Span::styled(s, span.style));
            } else if remaining == 1 {
                out.push(Span::styled("…", t.muted));
            }
            break;
        }
    }

    Line::from(out)
}

/// Truncate a string to at most `max_bytes` bytes on a valid UTF-8 char boundary.
fn safe_truncate(s: &str, max_bytes: usize) -> &str {