Helper function for slicing strings with ansi codes in them.

[blueforesticarus]

The library currently has helper functions for stripping escape codes, and measuring string length with them removed.

It would be useful to have a helper function which can break up a string, inserting escape codes to terminate and resume the styling. This would in particular be useful for multi-line strings being formatted into columned outputs. Like I am trying to do here: Nukesor/comfy-table#91

[blueforesticarus]

something like this

fn split_long_word(allowed_width: usize, word: &str) -> (String, String) {
    let mut iter = console::AnsiCodeIterator::new(word);
    let mut current_len = 0;

    let mut escapes = Vec::new();
    let mut head = String::with_capacity(word.len());
    let mut tail = String::with_capacity(word.len());

    #[allow(clippy::while_let_on_iterator)]
    while let Some((val,is_esc)) = iter.next(){
        if is_esc {
            escapes.push(val);
            if val == crossterm::style::Attribute::Reset.to_string() {
                tail.clear();
            }
        }

        let len = match is_esc {
            true => 0,
            false => val.chars().count(),
        };
        
        if current_len + len <= allowed_width {
            head.push_str(val);
            current_len += len;
        }else{
            assert!(! is_esc);
            let split = val.split_at(allowed_width - current_len);

            head.push_str(split.0);
            head.push_str(crossterm::style::Attribute::Reset.to_string().as_str());

            for esc in escapes{
                tail.push_str(esc);
            }
            tail.push_str(split.1);
            break;
        }
    }

    iter.for_each(|s| tail.push_str(s.0));
    (head, tail)
}

fn main() {
    let a = split_long_word(10, 
        &format!(r"asdf12{}", console::style(".device").bold().red())
    );
    println!("{}|newline\n{}|stuff", a.0,a.1);
}