def create_package_file(root, master_package, subroot, py_files, opts, subs):
    """Build the text of the file and write the file."""
    text = format_heading(1, '%s' % makename(master_package, subroot))

    if opts.modulefirst:
        text += format_directive(subroot, master_package)
        text += '\n'

    # build a list of directories that are szvpackages (contain an INITPY file)
    subs = [sub for sub in subs if path.isfile(path.join(root, sub, INITPY))]
    # if there are some package directories, add a TOC for theses subpackages
    if subs:
        # text += format_heading(2, 'Subpackages')
        text += '.. toctree::\n\n'
        for sub in subs:
            text += '    %s.%s\n' % (makename(master_package, subroot), sub)
        text += '\n'

    submods = [path.splitext(sub)[0] for sub in py_files
               if not shall_skip(path.join(root, sub), opts) and
               sub != INITPY]
    if submods:
        #text += format_heading(2, 'Submodules')
        if opts.separatemodules:
            text += '.. toctree::\n\n'
            for submod in submods:
                modfile = makename(master_package, makename(subroot, submod))
                text += '   %s\n' % modfile

                # generate separate file for this module
                if not opts.noheadings:
                    filetext = format_heading(1, '%s module' % modfile)
                else:
                    filetext = ''
                filetext += format_directive(makename(subroot, submod),
                                             master_package)
                write_file(modfile, filetext, opts)
        else:
            for submod in submods:
                modfile = makename(master_package, makename(subroot, submod))
                if not opts.noheadings:
                    text += format_heading(2, '%s module' % modfile)
                text += format_directive(makename(subroot, submod),
                                         master_package)
                text += '\n'
        text += '\n'

    if not opts.modulefirst:
        text += format_heading(2, 'Module contents')
        text += format_directive(subroot, master_package)

    write_file(makename(master_package, subroot), text, opts)