Function wrap_to_display_width

src/apps/cli/src/ui/string_utils.rs:81–119

Hard-wrap a single line to fit within display width (columns). Preserves all characters (no truncation), splitting long lines into multiple lines.

(s: &str, max_width: usize)

/// Hard-wrap a single line to fit within display width (columns).
/// Preserves all characters (no truncation), splitting long lines into multiple lines.
pub fn wrap_to_display_width(s: &str, max_width: usize) -> Vec<String> {
    if max_width == 0 {
        return vec![String::new()];
    }
    if s.is_empty() {
        return vec![String::new()];
    }

    let mut lines: Vec<String> = Vec::new();
    let mut current = String::new();
    let mut current_width = 0usize;

    for ch in s.chars() {
        let ch_width = UnicodeWidthChar::width(ch).unwrap_or(0);

        if !current.is_empty() && current_width + ch_width > max_width {
            lines.push(std::mem::take(&mut current));
            current_width = 0;
        }

        current.push(ch);
        current_width += ch_width;

        if current_width >= max_width && !current.is_empty() {
            lines.push(std::mem::take(&mut current));
            current_width = 0;
        }
    }

    if !current.is_empty() {
        lines.push(current);
    }

    if lines.is_empty() {
        lines.push(String::new());
    }

    lines
}