Making it easy to create headings in ReStructuredText syntax, in Vim

restructuredtext_helper.vim

if has('ruby')
    function! Heading(char)
ruby <<EOF
buffer = VIM::Buffer.current
new_line = VIM::evaluate("a:char") * buffer.line.length
buffer.append(buffer.line_number, new_line)
EOF
    endfunction

    command H1 call Heading('=')
    command H2 call Heading('-')
    command H3 call Heading('~')
endif