Function find_wrap_point

src/apps/cli/src/ui/markdown.rs:490–516

Find a good byte offset to split `text` at, fitting within `avail` display columns. Prefers splitting at the last space boundary. Returns (byte_offset, display_width_consumed).

(text: &str, avail: usize)

/// Find a good byte offset to split `text` at, fitting within `avail` display columns.
/// Prefers splitting at the last space boundary. Returns (byte_offset, display_width_consumed).
fn find_wrap_point(text: &str, avail: usize) -> (usize, usize) {
    let mut byte_pos = 0;
    let mut width = 0;
    let mut last_space_byte = 0;
    let mut last_space_width = 0;

    for ch in text.chars() {
        let ch_w = UnicodeWidthChar::width(ch).unwrap_or(0);
        if width + ch_w > avail {
            break;
        }
        byte_pos += ch.len_utf8();
        width += ch_w;

        if ch == ' ' {
            last_space_byte = byte_pos;
            last_space_width = width;
        }
    }

    // Prefer breaking at word boundary if we found a space in the first 60% of the line
    if last_space_byte > 0 && last_space_width > avail / 3 {
        (last_space_byte, last_space_width)
    } else {
        (byte_pos, width)
    }
}

/// Style modifier
#[derive(Debug, Clone, Copy)]