<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def sphinxify(docstring, context, buildername='html'):
 """ Runs Sphinx on a docstring and outputs the processed documentation. Parameters docstring : str a ReST-formatted docstring context : dict Variables to be passed to the layout template to control how its rendered (through the Sphinx variable *html_context*). buildername: str It can be either `html` or `text`. Returns ------- An Sphinx-processed string, in either HTML or plain text format, depending on the value of `buildername` """


    srcdir = mkdtemp()
    srcdir = encoding.to_unicode_from_fs(srcdir)
    destdir = osp.join(srcdir, '_build')

    rst_name = osp.join(srcdir, 'docstring.rst')
    if buildername == 'html':
        suffix = '.html'
    else:
        suffix = '.txt'
    output_name = osp.join(destdir, 'docstring' + suffix)

    # This is needed so users can type \\ on latex eqnarray envs inside raw
    # docstrings
    if context['right_sphinx_version'] and context['math_on']:
        docstring = docstring.replace('\\\\', '\\\\\\\\')
    
    # Add a class to several characters on the argspec. This way we can
    # highlight them using css, in a similar way to what IPython does.
    # NOTE: Before doing this, we escape common html chars so that they
    # don't interfere with the rest of html present in the page
    argspec = escape(context['argspec'])
    for char in ['=', ',', '(', ')', '*', '**']:
        argspec = argspec.replace(char,
                         '<span class="argspec-highlight">' + char + '</span>')
    context['argspec'] = argspec

    doc_file = codecs.open(rst_name, 'w', encoding='utf-8')
    doc_file.write(docstring)
    doc_file.close()
    
    temp_confdir = False
    if temp_confdir:
        # TODO: This may be inefficient. Find a faster way to do it.
        confdir = mkdtemp()
        confdir = encoding.to_unicode_from_fs(confdir)
        generate_configuration(confdir)
    else:
        confdir = osp.join(get_module_source_path('spyder.plugins.help.utils'))

    confoverrides = {'html_context': context}

    doctreedir = osp.join(srcdir, 'doctrees')

    sphinx_app = Sphinx(srcdir, confdir, destdir, doctreedir, buildername,
                        confoverrides, status=None, warning=None,
                        freshenv=True, warningiserror=False, tags=None)
    try:
        sphinx_app.build(None, [rst_name])
    except SystemMessage:
        output = _("It was not possible to generate rich text help for this "
                    "object.</br>"
                    "Please see it in plain text.")
        return warning(output)

    # TODO: Investigate if this is necessary/important for us
    if osp.exists(output_name):
        output = codecs.open(output_name, 'r', encoding='utf-8').read()
        output = output.replace('<pre>', '<pre class="literal-block">')
    else:
        output = _("It was not possible to generate rich text help for this "
                    "object.</br>"
                    "Please see it in plain text.")
        return warning(output)

    if temp_confdir:
        shutil.rmtree(confdir, ignore_errors=True)
    shutil.rmtree(srcdir, ignore_errors=True)

    return output