break text into lines of length n

gistfile1.js

// a bit messy and not optimized, but handy for basic formatting of short blocks of text

function splitToLines (string, leftMarginWidth, maxLineWidth) {
    var lines = [],
        line = [],
        padding = Array(leftMarginWidth).join(' '),
        i = 0, // cursor
        p = 0, // left anchor
        m = 0, // counter for searching 5 char wrap zone
        s, // tmpvar
        l = string.length,
        mLen = maxLineWidth - leftMarginWidth - 5;

    while (l > i) {
        i && line.push(padding);
        !i && (i = maxLineWidth - 5);

        while (i-- > p) {
            s = string.charAt(i);
            if (s == ' ' || s == '-') {
                i++;
                break;
            }
        }

        if (i == p) {
            i += mLen;
            while (string.charAt(i++) != ' ' && 5 > m++);
            if (string.charAt(i) != ' ')
                break;
            else
                m = 0;
        }

        line.push(string.slice(p, i));
        lines.push(line.join(''));
        line.length = 0;
        p = i;
        i += mLen;
    }

    lines.push(padding + string.slice(p));
    return lines.join('\n');
}

For example:

splitToLines("Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed 
do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad 
minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea 
commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit 
esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat 
non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.", 
14, 80);

should result in:

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod 
            tempor incididunt ut labore et dolore magna aliqua. Ut enim 
            ad minim veniam, quis nostrud exercitation ullamco laboris 
            nisi ut aliquip ex ea commodo consequat. Duis aute irure 
            dolor in reprehenderit in voluptate velit esse cillum dolore 
            eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat 
            non proident, sunt in culpa qui officia deserunt mollit anim 
            id est laborum.