term.header.v

pub fn header(otext, divider string) string {
    cols, _ := get_terminal_size()
    mut text := otext
    if text.len > 0 {
        text = ' $text '
    }
    // clip the text if it is too long
    text = if cols > text.len + 1 + 2*divider.len { text } else { text[0..cols-(1+2*divider.len)] }
    // make the text align with the terminal size:
    if (text.len % 2) != (cols % 2 ) {
        text += divider
    }
    filler := divider.repeat( (cols - text.len) / (2*divider.len) )
    return filler + text + filler
}

fn test_header(){
    divider := term.h_divider('-')
    term_width := divider.len

    empty_header := term.header('', '-')
    short_header := term.header('reasonable header', '-')
    very_long_header := term.header(['abc'].repeat(500).join(' '), '-')

    eprintln( empty_header )
    eprintln( short_header )
    eprintln(term.header('another longer header', '-+-'))
    eprintln(term.header('another longer header', '-'))
    eprintln(term.header('short','-'))
    eprintln(term.header('12345','-'))
    eprintln(term.header('1234','-'))
    eprintln(term.header('123','-'))
    eprintln(term.header('12','-'))
    eprintln(term.header('1','-'))
    eprintln( very_long_header )
    eprintln(term.header('','-'))

    assert term_width == empty_header.len
    assert term_width == short_header.len
    assert term_width == very_long_header.len
}