oblitum/.mailcap Secret

## .mailcap
text/html ; uconv --add-signature -f %{charset} -t UTF-8 %s | sponge %s && firefox -new-tab %s & sleep 5 ; description="HTML Document" ; test=test -n "$DISPLAY" ; nametemplate=%s.html
text/html ; w3m -I %{charset} -T text/html %s                                                            ; description="HTML Document" ; nametemplate=%s.html    ; copiousoutput

text/* ; nvim -Rc Goyo '%s' ; edit=nvim -c Goyo '%s' ; compose=nvim -c Goyo '%s' ; needsterminal

application/pdf ; zathura %s &> /dev/null ; description="PDF Document" ; test=test -n "$DISPLAY" ; nametemplate=%s.pdf
application/pdf ; pdftotext %s -          ; description="PDF Document" ; nametemplate=%s.pdf     ; copiousoutput

image/pdf                ; imv %s &> /dev/null ; description="PDF Image"   ; test=test "$DISPLAY" ; nametemplate=%s.pdf
image/gif                ; imv %s &> /dev/null ; description="GIF Image"   ; test=test "$DISPLAY" ; nametemplate=%s.gif
image/jpeg               ; imv %s &> /dev/null ; description="JPEG Image"  ; test=test "$DISPLAY" ; nametemplate=%s.jpeg
image/pjpeg              ; imv %s &> /dev/null ; description="JPEG Image"  ; test=test "$DISPLAY" ; nametemplate=%s.jpeg
image/tiff               ; imv %s &> /dev/null ; description="TIFF Image"  ; test=test "$DISPLAY" ; nametemplate=%s.tiff
image/x-portable-bitmap  ; imv %s &> /dev/null ; description="PBM Image"   ; test=test "$DISPLAY" ; nametemplate=%s.pbm
image/x-portable-graymap ; imv %s &> /dev/null ; description="PGM Image"   ; test=test "$DISPLAY" ; nametemplate=%s.pgm
image/x-portable-pixmap  ; imv %s &> /dev/null ; description="PPM Image"   ; test=test "$DISPLAY" ; nametemplate=%s.ppm
image/x-xbitmap          ; imv %s &> /dev/null ; description="XBM Image"   ; test=test "$DISPLAY" ; nametemplate=%s.xbm
image/x-xpixmap          ; imv %s &> /dev/null ; description="XPM Image"   ; test=test "$DISPLAY" ; nametemplate=%s.xpm
image/bmp                ; imv %s &> /dev/null ; description="BMP Image"   ; test=test "$DISPLAY" ; nametemplate=%s.bmp
image/x-bmp              ; imv %s &> /dev/null ; description="BMP Image"   ; test=test "$DISPLAY" ; nametemplate=%s.bmp
image/x-ms-bmp           ; imv %s &> /dev/null ; description="BMP Image"   ; test=test "$DISPLAY" ; nametemplate=%s.bmp
image/x-rgb              ; imv %s &> /dev/null ; description="RGB Image"   ; test=test "$DISPLAY" ; nametemplate=%s.rgb
image/targa              ; imv %s &> /dev/null ; description="TARGA Image" ; test=test "$DISPLAY" ; nametemplate=%s.tga
image/fits               ; imv %s &> /dev/null ; description="FITS Image"  ; test=test "$DISPLAY" ; nametemplate=%s.fits
image/png                ; imv %s &> /dev/null ; description="PNG Image"   ; test=test "$DISPLAY" ; nametemplate=%s.png
image/pm                 ; imv %s &> /dev/null ; description="PM Image"    ; test=test "$DISPLAY" ; nametemplate=%s.pm

## email.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="ProgId" content="Word.Document">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
$for(author-meta)$
  <meta name="author" content="$author-meta$" />
$endfor$
$if(date-meta)$
  <meta name="date" content="$date-meta$" />
$endif$
$if(keywords)$
  <meta name="keywords" content="$for(keywords)$$keywords$$sep$, $endfor$" />
$endif$
  <title>$if(title-prefix)$$title-prefix$ – $endif$$pagetitle$</title>
  <style type="text/css">
  body, table, td, a {
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
  }

  table, td {
    mso-table-lspace: 0pt;
    mso-table-rspace: 0pt;
  }

  img {
    -ms-interpolation-mode: bicubic;
  }

  img {
    border: 0;
    height: auto;
    line-height: 100%;
    outline: none;
    text-decoration: none;
  }

  body {
    height: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    width: 100% !important;
  }

  figure {
    margin: 0;
    padding: 0;
  }

  article, aside, details, figcaption, figure,footer, header, hgroup, menu, nav, section {
    display: block;
  }

  a[x-apple-data-detectors] {
    color: inherit !important;
    text-decoration: none !important;
    font-size: inherit !important;
    font-family: inherit !important;
    font-weight: inherit !important;
    line-height: inherit !important;
  }

  div[style*="margin: 16px 0;"] {
    margin: 0 !important;
  }

  table,td,div,a {
    box-sizing: border-box;
  }

  img {
    -ms-interpolation-mode: bicubic;
    max-width: 100%;
    display: inline-block;
    padding-top: 7px;
  }

  body, .body {
    font-family: Georgia, "Times New Roman", Times, serif;
    font-size: 14px;
    line-height: 1.2;
    height: 100% !important;
    width: 100% !important;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -ms-text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
  }

  table {
    border-collapse: separate !important;
    mso-table-lspace: 0pt;
    mso-table-rspace: 0pt;
    width: 100%;
  }

  table td {
    font-family: Georgia, "Times New Roman", Times, serif;
    font-size: 14px;
    vertical-align: top;
  }

  .ExternalClass {
    width: 100%;
  }

  .ExternalClass,.ExternalClass p,.ExternalClass span,.ExternalClass font,.ExternalClass td,.ExternalClass div {
    line-height: 100%;
  }

  strong, b {
    font-weight: bold;
  }

  .ajT {
    height: none;
    padding-top: none;
  }

  body {
    background-color: #ffffff;
  }

  .body {
    background-color: #ffffff;
    width: 100%;
  }

  .container {
    display: block;
    Margin: 0 auto !important;
    max-width: 800px;
    padding: 10px;
    width: 100% !important;
  }

  .content {
    display: block;
    margin: 0 auto;
    max-width: 800px;
    padding: 10px;
  }

  .main {
    background: #ffffff;
    border: none;
    border-radius: 4px;
    width: 100%;
  }

  .wrapper {
    padding: 10px;
  }

  .content-block {
    padding: 0 0 10px;
  }

  .header {
    margin-bottom: 10px;
    margin-top: 0px;
    width: 100%;
  }

  .footer {
    clear: both;
    width: 100%;
  }

  .footer * {
    color: #7F7F7F;
    font-size: 12px;
  }

  .footer td {
    padding: 20px 0;
  }

  h1,h2,h3,h4,h5,h6 {
    color: #222222 !important;
    font-family: "Roboto", "Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;
    font-weight: bold;
    line-height: 1.2;
    margin: 0;
    margin-bottom: 7px;
    margin-top: 10.5px;
  }

  h1, h2 {
    margin-bottom: 10.5px;
    margin-top: 14px;
  }

  h1 {
    font-size: 22.4px;
    text-transform: capitalize;
  }

  h2 {
    font-size: 19.6px;
  }

  h3 {
    font-size: 16.8px;
  }

  h4 {
    font-size: 15.4px;
  }

  h5 {
    font-size: 14px;
  }

  h6 {
    font-size: 12.6px;
  }

  p,ul,ol {
    font-family: Georgia, "Times New Roman", Times, serif;
    font-size: 14px;
    font-weight: normal;
    margin: 0;
    padding-top: 7px;
    color: #111111;
  }

  ul, ol {
    margin: 0;
    margin-bottom: 7.5px;
    padding-left: 25px;
  }

  ul li, ol li {
    list-style-position: outside;
    margin-left: 5px;
    margin-bottom: 1px;
  }

  li > ul, li > ol {
    margin-top: 7.5px;
  }

  a {
    color: #348eda;
    text-decoration: none;
    font-weight: bold;
  }

  pre > a, code > a {
    color: none;
    font-weight: normal;
  }

  code,pre,.word-wrap {
    word-break: break-word;
    word-wrap: break-word;
    -webkit-hyphens: auto;
    -moz-hyphens: auto;
    hyphens: auto;
  }

  pre, code {
    font-family: Menlo, Monaco, Consolas, "Courier New", monospace;
    font-size: 11.9px;
  }

  pre {
    display: block;
    width: 96%;
    margin: 1em 0;
    margin-bottom: 9px;
    background: #f8f8f8;
    padding: 1%;
    white-space: pre-wrap;
    border-radius: 4px;
  }

  p > code {
    color: #111111;
    background: none;
  }

  blockquote {
    padding: 0 7px 0 7px;
    border-left: 2px solid #cccccc;
    border-top: 4.2px solid transparent;
    font-style: italic;
    margin: 0 0 7px 3px;
  }

  blockquote p {
    padding: 0;
  }

  mark {
    background: #ff0;
  }

  dl dt {
    font-weight: bold;
  }

  dl dd {
    margin-left: 28px;
  }

  .et-btn {
    width: 100%;
    font-family: "Roboto", "Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;
    margin-bottom: 10px;
  }

  .et-btn table {
    width: auto;
  }

  .et-btn table td {
    background-color: #ffffff;
    border-radius: 4px;
    text-align: center;
  }

  .et-btn a {
    background-color: #ffffff;
    border: solid 1px #348eda;
    border-radius: 4px;
    color: #348eda;
    cursor: pointer;
    display: inline-block;
    font-size: 14px;
    font-weight: bold;
    margin: 0;
    padding: 8px 18px;
    text-decoration: none;
    text-transform: capitalize;
    font-family: "Roboto", "Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;
  }

  .et-btn-primary table td {
    background-color: #348eda;
  }

  .et-btn-primary a {
    background-color: #348eda;
    border-color: #348eda;
    color: #ffffff;
  }

  .et-btn-secondary table td {
    background-color: transparent;
  }

  .et-btn-secondary a {
    background-color: transparent;
    border-color: #348eda;
    color: #348eda;
  }

  .et-notice {
    border-collapse: separate;
  }

  .et-notice-spacer {
    padding: 10px 0;
  }

  .et-notice td {
    line-height: 1.2;
    font-size: 14px;
    font-weight: normal;
    font-family: "Roboto", "Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;
  }

  .et-notice td p {
    margin: 0;
    padding: 0;
  }

  .et-notice-info td {
    background: #f0f6fb;
    border: 1px solid #b7d3ed;
    border-radius: 4px;
    color: #2c6eac;
    padding: 6px 10px;
  }

  .et-notice-success td {
    background: #e1f2bd;
    border: 1px solid #c6e682;
    border-radius: 4px;
    color: #61821a;
    padding: 6px 10px;
  }

  .et-notice-warning td {
    background: #f7eed0;
    border: 1px solid #edd993;
    border-radius: 4px;
    color: #9a7d1a;
    padding: 6px 10px;
  }

  .et-notice-danger td {
    background: #f5d5d5;
    border: 1px solid #e89b9b;
    border-radius: 4px;
    color: #952222;
    padding: 6px 10px;
  }

  .et-notice-lg td {
    font-size: 16.8px;
    line-height: 1.2;
  }

  .divider {
    border-collapse: separate;
  }

  .divider-spacer {
    padding: 14px 0;
  }

  .divider td {
    border-top: 1px solid #ccc;
    line-height: 0;
    font-size: 0;
    height: 1px;
    margin: 0;
    padding: 0;
  }

  hr {
    margin: 28px 0;
    border: none;
    border-top: 1px solid #cccccc;
    color: #ffffff;
  }

  .last {
    margin-bottom: 0;
  }

  .first {
    margin-top: 0;
  }

  .align-center {
    text-align: center;
  }

  .align-right {
    text-align: right;
  }

  .align-left {
    text-align: left;
  }

  .clear {
    clear: both;
  }

  .mt0 {
    margin-top: 0;
  }

  .mb0 {
    margin-bottom: 0;
  }

  .preheader {
    color: transparent;
    display: none;
    height: 0;
    max-height: 0;
    max-width: 0;
    opacity: 0;
    overflow: hidden;
    mso-hide: all;
    visibility: hidden;
    width: 0;
  }

  @media only screen and (max-width: 840px) {
    table[class=body] {
      font-size: 12px !important;
    }

    table[class=body] p,table[class=body] ul,table[class=body] ol {
      font-size: 12px !important;
    }

    table[class=body] .et-btn {
      margin-bottom: 15px;
    }

    table[class=body] h1 {
      font-size: 18.2px !important;
    }

    table[class=body] h2 {
      font-size: 16.8px !important;
    }

    table[class=body] h3 {
      font-size: 15.4px !important;
    }

    table[class=body] h4 {
      font-size: 14.7px !important;
    }

    table[class=body] h5 {
      font-size: 12.6px !important;
    }

    table[class=body] h6 {
      font-size: 11.9px !important;
    }

    table[class=body] h1, table[class=body] h2 {
      margin-bottom: 14px !important;
      margin-top: 14px !important;
    }

    table[class=body] .container, table[class=body] .content {
      width: 100% !important;
      max-width: 100% !important;
    }

    table[class=body] .content,table[class=body] .wrapper {
      padding: 10px !important;
    }

    table[class=body] .container {
      padding: 0 !important;
      width: 100% !important;
    }

    table[class=body] .btn table,table[class=body] .btn a {
      width: 100% !important;
    }
  }
  </style>
$if(quotes)$
  <style type="text/css">q { quotes: "“" "”" "‘" "’"; }</style>
$endif$
$if(highlighting-css)$
  <style type="text/css">
$highlighting-css$
  </style>
$endif$
$for(css)$
  <link rel="stylesheet" href="$css$" type="text/css" />
$endfor$
$if(math)$
  $math$
$endif$
$for(header-includes)$
  $header-includes$
$endfor$
</head>
<body>
$for(include-before)$
$include-before$
$endfor$
$if(title)$
<div id="$idprefix$header">
<h1 class="title">$title$</h1>
$if(subtitle)$
<h1 class="subtitle">$subtitle$</h1>
$endif$
$for(author)$
<h2 class="author">$author$</h2>
$endfor$
$if(date)$
<h3 class="date">$date$</h3>
$endif$
</div>
$endif$
$if(toc)$
<div id="$idprefix$TOC">
$toc$
</div>
$endif$
$body$
$for(include-after)$
$include-after$
$endfor$
</body>
</html>

## MIMEmbellish
#!/usr/bin/env python3

import re
import sys
import email
import shlex
import mimetypes
import subprocess
from copy import copy
from hashlib import md5
from email import charset
from email import encoders
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.nonmultipart import MIMENonMultipart
from os.path import basename, splitext, expanduser


charset.add_charset('utf-8', charset.SHORTEST, '8bit')


def pandoc(from_format, to_format='markdown', plain='markdown', title=None):
    markdown = ('markdown'
                '-blank_before_blockquote')

    if from_format == 'plain':
        from_format = plain
    if from_format == 'markdown':
        from_format = markdown
    if to_format == 'markdown':
        to_format = markdown

    command = 'pandoc -f {} -t {} --standalone --highlight-style=tango'
    if to_format in ('html', 'html5'):
        if title is not None:
            command += ' --variable=pagetitle:{}'.format(shlex.quote(title))
        command += ' --webtex --template={}'.format(
                expanduser('~/.pandoc/templates/email.html'))
    return command.format(from_format, to_format)


def gmailfy(payload):
    return payload.replace('<blockquote>',
                           '<blockquote class="gmail_quote" style="'
                           'padding: 0 7px 0 7px;'
                           'border-left: 2px solid #cccccc;'
                           'font-style: italic;'
                           'margin: 0 0 7px 3px;'
                           '">')


def make_alternative(message, part):
    alternative = convert(part, 'html',
                          pandoc(part.get_content_subtype(),
                                 to_format='html',
                                 title=message.get('Subject')))
    alternative.set_payload(gmailfy(alternative.get_payload()))
    return alternative


def make_replacement(message, part):
    return convert(part, 'plain', pandoc(part.get_content_subtype()))


def convert(part, to_subtype, command):
    payload = part.get_payload()
    if isinstance(payload, str):
        payload = payload.encode('utf-8')
    else:
        payload = part.get_payload(None, True)
        if not isinstance(payload, bytes):
            payload = payload.encode('utf-8')
    process = subprocess.run(
        shlex.split(command),
        input=payload, stdout=subprocess.PIPE, check=True)
    return MIMEText(process.stdout, to_subtype, 'utf-8')


def with_alternative(parent, part, from_signed,
                     make_alternative=make_alternative,
                     make_replacement=None):
    try:
        alternative = make_alternative(parent or part, from_signed or part)
        replacement = (make_replacement(parent or part, part)
                       if from_signed is None and make_replacement is not None
                       else part)
    except:
        return parent or part
    envelope = MIMEMultipart('alternative')
    if parent is None:
        for k, v in part.items():
            if (k.lower() != 'mime-version'
                    and not k.lower().startswith('content-')):
                envelope.add_header(k, v)
                del part[k]
    envelope.attach(replacement)
    envelope.attach(alternative)
    if parent is None:
        return envelope
    payload = parent.get_payload()
    payload[payload.index(part)] = envelope
    return parent


def tag_attachments(message):
    if message.get_content_type() == 'multipart/mixed':
        for part in message.get_payload():
            if (part.get_content_maintype() in ['image']
                    and 'Content-ID' not in part):
                filename = part.get_param('filename',
                                          header='Content-Disposition')
                if isinstance(filename, tuple):
                    filename = str(filename[2], filename[0] or 'us-ascii')
                if filename:
                    filename = splitext(basename(filename))[0]
                    if filename:
                        part.add_header('Content-ID', '<{}>'.format(filename))
    return message


def attachment_from_file_path(attachment_path):
    try:
        mime, encoding = mimetypes.guess_type(attachment_path, strict=False)
        maintype, subtype = mime.split('/')
        with open(attachment_path, 'rb') as payload:
            attachment = MIMENonMultipart(maintype, subtype)
            attachment.set_payload(payload.read())
            encoders.encode_base64(attachment)
            if encoding:
                attachment.add_header('Content-Encoding', encoding)
            return attachment
    except:
        return None


attachment_path_pattern = re.compile(r'\]\s*\(\s*file://(/[^)]*\S)\s*\)|'
                                     r'\]\s*:\s*file://(/.*\S)\s*$',
                                     re.MULTILINE)


def link_attachments(payload):
    attached = []
    attachments = []

    def on_match(match):
        if match.group(1):
            attachment_path = match.group(1)
            cid_fmt = '](cid:{})'
        else:
            attachment_path = match.group(2)
            cid_fmt = ']: cid:{}'
        attachment_id = md5(attachment_path.encode()).hexdigest()
        if attachment_id in attached:
            return cid_fmt.format(attachment_id)
        attachment = attachment_from_file_path(attachment_path)
        if attachment:
            attachment.add_header('Content-ID', '<{}>'.format(attachment_id))
            attachments.append(attachment)
            attached.append(attachment_id)
            return cid_fmt.format(attachment_id)
        return match.group()

    return attachments, attachment_path_pattern.sub(on_match, payload)


def with_local_attachments(parent, part, from_signed,
                           link_attachments=link_attachments):
    if from_signed is None:
        attachments, payload = link_attachments(part.get_payload())
        part.set_payload(payload)
    else:
        attachments, payload = link_attachments(from_signed.get_payload())
        from_signed = copy(from_signed)
        from_signed.set_payload(payload)
    if not attachments:
        return parent, part, from_signed
    if parent is None:
        parent = MIMEMultipart('mixed')
        for k, v in part.items():
            if (k.lower() != 'mime-version'
                    and not k.lower().startswith('content-')):
                parent.add_header(k, v)
                del part[k]
        parent.attach(part)
    for attachment in attachments:
        parent.attach(attachment)
    return parent, part, from_signed


def is_target(part, target_subtypes):
    return (part.get('Content-Disposition', 'inline') == 'inline'
            and part.get_content_maintype() == 'text'
            and part.get_content_subtype() in target_subtypes)


def pick_from_signed(part, target_subtypes):
    for from_signed in part.get_payload():
        if is_target(from_signed, target_subtypes):
            return from_signed


def seek_target(message, target_subtypes=['plain', 'markdown']):
    if message.is_multipart():
        if message.get_content_type() == 'multipart/signed':
            part = pick_from_signed(message, target_subtypes)
            if part is not None:
                return None, message, part
        elif message.get_content_type() == 'multipart/mixed':
            for part in message.get_payload():
                if part.is_multipart():
                    if part.get_content_type() == 'multipart/signed':
                        from_signed = pick_from_signed(part, target_subtypes)
                        if from_signed is not None:
                            return message, part, from_signed
                elif is_target(part, target_subtypes):
                    return message, part, None
    else:
        if is_target(message, target_subtypes):
            return None, message, None
    return None, None, None


def main():
    try:
        message = email.message_from_file(sys.stdin)
        parent, part, from_signed = seek_target(message)
        if (parent, part, from_signed) == (None, None, None):
            print(message)
            return
        tag_attachments(message)
        print(with_alternative(
             *with_local_attachments(parent, part, from_signed)))
    except (BrokenPipeError, KeyboardInterrupt):
        pass


if __name__ == '__main__':
    main()

## MIMEmbellish (fixed for aerc)
#!/usr/bin/env python3

import re
import sys
import email
import shlex
import mimetypes
import subprocess
from copy import copy
from hashlib import md5
from email import charset
from email import encoders
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.nonmultipart import MIMENonMultipart
from os.path import basename, splitext, expanduser


charset.add_charset('utf-8', charset.SHORTEST, '8bit')


def pandoc(from_format, to_format='markdown', plain='markdown', title=None):
    markdown = ('markdown'
                '-blank_before_blockquote')

    if from_format == 'plain':
        from_format = plain
    if from_format == 'markdown':
        from_format = markdown
    if to_format == 'markdown':
        to_format = markdown

    command = 'pandoc -f {} -t {} --standalone --highlight-style=tango'
    if to_format in ('html', 'html5'):
        if title is not None:
            command += ' --variable=pagetitle:{}'.format(shlex.quote(title))
        command += ' --webtex --template={}'.format(
                expanduser('~/.pandoc/templates/email.html'))
    return command.format(from_format, to_format)


def gmailfy(payload):
    return payload.replace('<blockquote>',
                           '<blockquote class="gmail_quote" style="'
                           'padding: 0 7px 0 7px;'
                           'border-left: 2px solid #cccccc;'
                           'font-style: italic;'
                           'margin: 0 0 7px 3px;'
                           '">')


def make_alternative(message, part):
    alternative = convert(part, 'html',
                          pandoc(part.get_content_subtype(),
                                 to_format='html',
                                 title=message.get('Subject')))
    alternative.set_payload(gmailfy(alternative.get_payload()))
    return alternative


def make_replacement(message, part):
    return convert(part, 'plain', pandoc(part.get_content_subtype()))


def convert(part, to_subtype, command):
    payload = part.get_payload(decode=True)
    process = subprocess.run(
        shlex.split(command),
        input=payload, stdout=subprocess.PIPE, check=True)
    return MIMEText(process.stdout, to_subtype, 'utf-8')


def with_alternative(parent, part, from_signed,
                     make_alternative=make_alternative,
                     make_replacement=None):
    try:
        alternative = make_alternative(parent or part, from_signed or part)
        replacement = (make_replacement(parent or part, part)
                       if from_signed is None and make_replacement is not None
                       else part)
    except:
        return parent or part
    envelope = MIMEMultipart('alternative')
    if parent is None:
        for k, v in part.items():
            if (k.lower() != 'mime-version'
                    and not k.lower().startswith('content-')):
                envelope.add_header(k, v)
                del part[k]
    envelope.attach(replacement)
    envelope.attach(alternative)
    if parent is None:
        return envelope
    payload = parent.get_payload()
    payload[payload.index(part)] = envelope
    return parent


def tag_attachments(message):
    if message.get_content_type() == 'multipart/mixed':
        for part in message.get_payload():
            if (part.get_content_maintype() in ['image']
                    and 'Content-ID' not in part):
                filename = part.get_param('filename',
                                          header='Content-Disposition')
                if isinstance(filename, tuple):
                    filename = str(filename[2], filename[0] or 'us-ascii')
                if filename:
                    filename = splitext(basename(filename))[0]
                    if filename:
                        part.add_header('Content-ID', '<{}>'.format(filename))
    return message


def attachment_from_file_path(attachment_path):
    try:
        mime, encoding = mimetypes.guess_type(attachment_path, strict=False)
        maintype, subtype = mime.split('/')
        with open(attachment_path, 'rb') as payload:
            attachment = MIMENonMultipart(maintype, subtype)
            attachment.set_payload(payload.read())
            encoders.encode_base64(attachment)
            if encoding:
                attachment.add_header('Content-Encoding', encoding)
            return attachment
    except:
        return None


attachment_path_pattern = re.compile(r'\]\s*\(\s*file://(/[^)]*\S)\s*\)|'
                                     r'\]\s*:\s*file://(/.*\S)\s*$',
                                     re.MULTILINE)


def link_attachments(payload):
    attached = []
    attachments = []

    def on_match(match):
        if match.group(1):
            attachment_path = match.group(1)
            cid_fmt = '](cid:{})'
        else:
            attachment_path = match.group(2)
            cid_fmt = ']: cid:{}'
        attachment_id = md5(attachment_path.encode()).hexdigest()
        if attachment_id in attached:
            return cid_fmt.format(attachment_id)
        attachment = attachment_from_file_path(attachment_path)
        if attachment:
            attachment.add_header('Content-ID', '<{}>'.format(attachment_id))
            attachments.append(attachment)
            attached.append(attachment_id)
            return cid_fmt.format(attachment_id)
        return match.group()

    return attachments, attachment_path_pattern.sub(on_match, payload)


def with_local_attachments(parent, part, from_signed,
                           link_attachments=link_attachments):
    if from_signed is None:
        attachments, payload = link_attachments(part.get_payload())
        part.set_payload(payload)
    else:
        attachments, payload = link_attachments(from_signed.get_payload())
        from_signed = copy(from_signed)
        from_signed.set_payload(payload)
    if not attachments:
        return parent, part, from_signed
    if parent is None:
        parent = MIMEMultipart('mixed')
        for k, v in part.items():
            if (k.lower() != 'mime-version'
                    and not k.lower().startswith('content-')):
                parent.add_header(k, v)
                del part[k]
        parent.attach(part)
    for attachment in attachments:
        parent.attach(attachment)
    return parent, part, from_signed


def is_target(part, target_subtypes):
    return (part.get('Content-Disposition', 'inline') == 'inline'
            and part.get_content_maintype() == 'text'
            and part.get_content_subtype() in target_subtypes)


def pick_from_signed(part, target_subtypes):
    for from_signed in part.get_payload():
        if is_target(from_signed, target_subtypes):
            return from_signed


def seek_target(message, target_subtypes=['plain', 'markdown']):
    if message.is_multipart():
        if message.get_content_type() == 'multipart/signed':
            part = pick_from_signed(message, target_subtypes)
            if part is not None:
                return None, message, part
        elif message.get_content_type() == 'multipart/mixed':
            for part in message.get_payload():
                if part.is_multipart():
                    if part.get_content_type() == 'multipart/signed':
                        from_signed = pick_from_signed(part, target_subtypes)
                        if from_signed is not None:
                            return message, part, from_signed
                elif is_target(part, target_subtypes):
                    return message, part, None
    else:
        if is_target(message, target_subtypes):
            return None, message, None
    return None, None, None


def main():
    try:
        message = email.message_from_file(sys.stdin)
        parent, part, from_signed = seek_target(message)
        if (parent, part, from_signed) == (None, None, None):
            print(message)
            return
        tag_attachments(message)
        print(with_alternative(
             *with_local_attachments(parent, part, from_signed)))
    except (BrokenPipeError, KeyboardInterrupt):
        pass


if __name__ == '__main__':
    main()
	text/html ; uconv --add-signature -f %{charset} -t UTF-8 %s \| sponge %s && firefox -new-tab %s & sleep 5 ; description="HTML Document" ; test=test -n "$DISPLAY" ; nametemplate=%s.html
	text/html ; w3m -I %{charset} -T text/html %s ; description="HTML Document" ; nametemplate=%s.html ; copiousoutput

	text/* ; nvim -Rc Goyo '%s' ; edit=nvim -c Goyo '%s' ; compose=nvim -c Goyo '%s' ; needsterminal

	application/pdf ; zathura %s &> /dev/null ; description="PDF Document" ; test=test -n "$DISPLAY" ; nametemplate=%s.pdf
	application/pdf ; pdftotext %s - ; description="PDF Document" ; nametemplate=%s.pdf ; copiousoutput

	image/pdf ; imv %s &> /dev/null ; description="PDF Image" ; test=test "$DISPLAY" ; nametemplate=%s.pdf
	image/gif ; imv %s &> /dev/null ; description="GIF Image" ; test=test "$DISPLAY" ; nametemplate=%s.gif
	image/jpeg ; imv %s &> /dev/null ; description="JPEG Image" ; test=test "$DISPLAY" ; nametemplate=%s.jpeg
	image/pjpeg ; imv %s &> /dev/null ; description="JPEG Image" ; test=test "$DISPLAY" ; nametemplate=%s.jpeg
	image/tiff ; imv %s &> /dev/null ; description="TIFF Image" ; test=test "$DISPLAY" ; nametemplate=%s.tiff
	image/x-portable-bitmap ; imv %s &> /dev/null ; description="PBM Image" ; test=test "$DISPLAY" ; nametemplate=%s.pbm
	image/x-portable-graymap ; imv %s &> /dev/null ; description="PGM Image" ; test=test "$DISPLAY" ; nametemplate=%s.pgm
	image/x-portable-pixmap ; imv %s &> /dev/null ; description="PPM Image" ; test=test "$DISPLAY" ; nametemplate=%s.ppm
	image/x-xbitmap ; imv %s &> /dev/null ; description="XBM Image" ; test=test "$DISPLAY" ; nametemplate=%s.xbm
	image/x-xpixmap ; imv %s &> /dev/null ; description="XPM Image" ; test=test "$DISPLAY" ; nametemplate=%s.xpm
	image/bmp ; imv %s &> /dev/null ; description="BMP Image" ; test=test "$DISPLAY" ; nametemplate=%s.bmp
	image/x-bmp ; imv %s &> /dev/null ; description="BMP Image" ; test=test "$DISPLAY" ; nametemplate=%s.bmp
	image/x-ms-bmp ; imv %s &> /dev/null ; description="BMP Image" ; test=test "$DISPLAY" ; nametemplate=%s.bmp
	image/x-rgb ; imv %s &> /dev/null ; description="RGB Image" ; test=test "$DISPLAY" ; nametemplate=%s.rgb
	image/targa ; imv %s &> /dev/null ; description="TARGA Image" ; test=test "$DISPLAY" ; nametemplate=%s.tga
	image/fits ; imv %s &> /dev/null ; description="FITS Image" ; test=test "$DISPLAY" ; nametemplate=%s.fits
	image/png ; imv %s &> /dev/null ; description="PNG Image" ; test=test "$DISPLAY" ; nametemplate=%s.png
	image/pm ; imv %s &> /dev/null ; description="PM Image" ; test=test "$DISPLAY" ; nametemplate=%s.pm
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="ProgId" content="Word.Document">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<meta http-equiv="X-UA-Compatible" content="IE=edge" />
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	$for(author-meta)$
	<meta name="author" content="$author-meta$" />
	$endfor$
	$if(date-meta)$
	<meta name="date" content="$date-meta$" />
	$endif$
	$if(keywords)$
	<meta name="keywords" content="$for(keywords)$$keywords$$sep$, $endfor$" />
	$endif$
	<title>$if(title-prefix)$$title-prefix$ – $endif$$pagetitle$</title>
	<style type="text/css">
	body, table, td, a {
	-webkit-text-size-adjust: 100%;
	-ms-text-size-adjust: 100%;
	}

	table, td {
	mso-table-lspace: 0pt;
	mso-table-rspace: 0pt;
	}

	img {
	-ms-interpolation-mode: bicubic;
	}

	img {
	border: 0;
	height: auto;
	line-height: 100%;
	outline: none;
	text-decoration: none;
	}

	body {
	height: 100% !important;
	margin: 0 !important;
	padding: 0 !important;
	width: 100% !important;
	}

	figure {
	margin: 0;
	padding: 0;
	}

	article, aside, details, figcaption, figure,footer, header, hgroup, menu, nav, section {
	display: block;
	}

	a[x-apple-data-detectors] {
	color: inherit !important;
	text-decoration: none !important;
	font-size: inherit !important;
	font-family: inherit !important;
	font-weight: inherit !important;
	line-height: inherit !important;
	}

	div[style*="margin: 16px 0;"] {
	margin: 0 !important;
	}

	table,td,div,a {
	box-sizing: border-box;
	}

	img {
	-ms-interpolation-mode: bicubic;
	max-width: 100%;
	display: inline-block;
	padding-top: 7px;
	}

	body, .body {
	font-family: Georgia, "Times New Roman", Times, serif;
	font-size: 14px;
	line-height: 1.2;
	height: 100% !important;
	width: 100% !important;
	margin: 0;
	padding: 0;
	-webkit-font-smoothing: antialiased;
	-ms-text-size-adjust: 100%;
	-webkit-text-size-adjust: 100%;
	}

	table {
	border-collapse: separate !important;
	mso-table-lspace: 0pt;
	mso-table-rspace: 0pt;
	width: 100%;
	}

	table td {
	font-family: Georgia, "Times New Roman", Times, serif;
	font-size: 14px;
	vertical-align: top;
	}

	.ExternalClass {
	width: 100%;
	}

	.ExternalClass,.ExternalClass p,.ExternalClass span,.ExternalClass font,.ExternalClass td,.ExternalClass div {
	line-height: 100%;
	}

	strong, b {
	font-weight: bold;
	}

	.ajT {
	height: none;
	padding-top: none;
	}

	body {
	background-color: #ffffff;
	}

	.body {
	background-color: #ffffff;
	width: 100%;
	}

	.container {
	display: block;
	Margin: 0 auto !important;
	max-width: 800px;
	padding: 10px;
	width: 100% !important;
	}

	.content {
	display: block;
	margin: 0 auto;
	max-width: 800px;
	padding: 10px;
	}

	.main {
	background: #ffffff;
	border: none;
	border-radius: 4px;
	width: 100%;
	}

	.wrapper {
	padding: 10px;
	}

	.content-block {
	padding: 0 0 10px;
	}

	.header {
	margin-bottom: 10px;
	margin-top: 0px;
	width: 100%;
	}

	.footer {
	clear: both;
	width: 100%;
	}

	.footer * {
	color: #7F7F7F;
	font-size: 12px;
	}

	.footer td {
	padding: 20px 0;
	}

	h1,h2,h3,h4,h5,h6 {
	color: #222222 !important;
	font-family: "Roboto", "Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;
	font-weight: bold;
	line-height: 1.2;
	margin: 0;
	margin-bottom: 7px;
	margin-top: 10.5px;
	}

	h1, h2 {
	margin-bottom: 10.5px;
	margin-top: 14px;
	}

	h1 {
	font-size: 22.4px;
	text-transform: capitalize;
	}

	h2 {
	font-size: 19.6px;
	}

	h3 {
	font-size: 16.8px;
	}

	h4 {
	font-size: 15.4px;
	}

	h5 {
	font-size: 14px;
	}

	h6 {
	font-size: 12.6px;
	}

	p,ul,ol {
	font-family: Georgia, "Times New Roman", Times, serif;
	font-size: 14px;
	font-weight: normal;
	margin: 0;
	padding-top: 7px;
	color: #111111;
	}

	ul, ol {
	margin: 0;
	margin-bottom: 7.5px;
	padding-left: 25px;
	}

	ul li, ol li {
	list-style-position: outside;
	margin-left: 5px;
	margin-bottom: 1px;
	}

	li > ul, li > ol {
	margin-top: 7.5px;
	}

	a {
	color: #348eda;
	text-decoration: none;
	font-weight: bold;
	}

	pre > a, code > a {
	color: none;
	font-weight: normal;
	}

	code,pre,.word-wrap {
	word-break: break-word;
	word-wrap: break-word;
	-webkit-hyphens: auto;
	-moz-hyphens: auto;
	hyphens: auto;
	}

	pre, code {
	font-family: Menlo, Monaco, Consolas, "Courier New", monospace;
	font-size: 11.9px;
	}

	pre {
	display: block;
	width: 96%;
	margin: 1em 0;
	margin-bottom: 9px;
	background: #f8f8f8;
	padding: 1%;
	white-space: pre-wrap;
	border-radius: 4px;
	}

	p > code {
	color: #111111;
	background: none;
	}

	blockquote {
	padding: 0 7px 0 7px;
	border-left: 2px solid #cccccc;
	border-top: 4.2px solid transparent;
	font-style: italic;
	margin: 0 0 7px 3px;
	}

	blockquote p {
	padding: 0;
	}

	mark {
	background: #ff0;
	}

	dl dt {
	font-weight: bold;
	}

	dl dd {
	margin-left: 28px;
	}

	.et-btn {
	width: 100%;
	font-family: "Roboto", "Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;
	margin-bottom: 10px;
	}

	.et-btn table {
	width: auto;
	}

	.et-btn table td {
	background-color: #ffffff;
	border-radius: 4px;
	text-align: center;
	}

	.et-btn a {
	background-color: #ffffff;
	border: solid 1px #348eda;
	border-radius: 4px;
	color: #348eda;
	cursor: pointer;
	display: inline-block;
	font-size: 14px;
	font-weight: bold;
	margin: 0;
	padding: 8px 18px;
	text-decoration: none;
	text-transform: capitalize;
	font-family: "Roboto", "Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;
	}

	.et-btn-primary table td {
	background-color: #348eda;
	}

	.et-btn-primary a {
	background-color: #348eda;
	border-color: #348eda;
	color: #ffffff;
	}

	.et-btn-secondary table td {
	background-color: transparent;
	}

	.et-btn-secondary a {
	background-color: transparent;
	border-color: #348eda;
	color: #348eda;
	}

	.et-notice {
	border-collapse: separate;
	}

	.et-notice-spacer {
	padding: 10px 0;
	}

	.et-notice td {
	line-height: 1.2;
	font-size: 14px;
	font-weight: normal;
	font-family: "Roboto", "Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;
	}

	.et-notice td p {
	margin: 0;
	padding: 0;
	}

	.et-notice-info td {
	background: #f0f6fb;
	border: 1px solid #b7d3ed;
	border-radius: 4px;
	color: #2c6eac;
	padding: 6px 10px;
	}

	.et-notice-success td {
	background: #e1f2bd;
	border: 1px solid #c6e682;
	border-radius: 4px;
	color: #61821a;
	padding: 6px 10px;
	}

	.et-notice-warning td {
	background: #f7eed0;
	border: 1px solid #edd993;
	border-radius: 4px;
	color: #9a7d1a;
	padding: 6px 10px;
	}

	.et-notice-danger td {
	background: #f5d5d5;
	border: 1px solid #e89b9b;
	border-radius: 4px;
	color: #952222;
	padding: 6px 10px;
	}

	.et-notice-lg td {
	font-size: 16.8px;
	line-height: 1.2;
	}

	.divider {
	border-collapse: separate;
	}

	.divider-spacer {
	padding: 14px 0;
	}

	.divider td {
	border-top: 1px solid #ccc;
	line-height: 0;
	font-size: 0;
	height: 1px;
	margin: 0;
	padding: 0;
	}

	hr {
	margin: 28px 0;
	border: none;
	border-top: 1px solid #cccccc;
	color: #ffffff;
	}

	.last {
	margin-bottom: 0;
	}

	.first {
	margin-top: 0;
	}

	.align-center {
	text-align: center;
	}

	.align-right {
	text-align: right;
	}

	.align-left {
	text-align: left;
	}

	.clear {
	clear: both;
	}

	.mt0 {
	margin-top: 0;
	}

	.mb0 {
	margin-bottom: 0;
	}

	.preheader {
	color: transparent;
	display: none;
	height: 0;
	max-height: 0;
	max-width: 0;
	opacity: 0;
	overflow: hidden;
	mso-hide: all;
	visibility: hidden;
	width: 0;
	}

	@media only screen and (max-width: 840px) {
	table[class=body] {
	font-size: 12px !important;
	}

	table[class=body] p,table[class=body] ul,table[class=body] ol {
	font-size: 12px !important;
	}

	table[class=body] .et-btn {
	margin-bottom: 15px;
	}

	table[class=body] h1 {
	font-size: 18.2px !important;
	}

	table[class=body] h2 {
	font-size: 16.8px !important;
	}

	table[class=body] h3 {
	font-size: 15.4px !important;
	}

	table[class=body] h4 {
	font-size: 14.7px !important;
	}

	table[class=body] h5 {
	font-size: 12.6px !important;
	}

	table[class=body] h6 {
	font-size: 11.9px !important;
	}

	table[class=body] h1, table[class=body] h2 {
	margin-bottom: 14px !important;
	margin-top: 14px !important;
	}

	table[class=body] .container, table[class=body] .content {
	width: 100% !important;
	max-width: 100% !important;
	}

	table[class=body] .content,table[class=body] .wrapper {
	padding: 10px !important;
	}

	table[class=body] .container {
	padding: 0 !important;
	width: 100% !important;
	}

	table[class=body] .btn table,table[class=body] .btn a {
	width: 100% !important;
	}
	}
	</style>
	$if(quotes)$
	<style type="text/css">q { quotes: "“" "”" "‘" "’"; }</style>
	$endif$
	$if(highlighting-css)$
	<style type="text/css">
	$highlighting-css$
	</style>
	$endif$
	$for(css)$
	<link rel="stylesheet" href="$css$" type="text/css" />
	$endfor$
	$if(math)$
	$math$
	$endif$
	$for(header-includes)$
	$header-includes$
	$endfor$
	</head>
	<body>
	$for(include-before)$
	$include-before$
	$endfor$
	$if(title)$
	<div id="$idprefix$header">
	<h1 class="title">$title$</h1>
	$if(subtitle)$
	<h1 class="subtitle">$subtitle$</h1>
	$endif$
	$for(author)$
	<h2 class="author">$author$</h2>
	$endfor$
	$if(date)$
	<h3 class="date">$date$</h3>
	$endif$
	</div>
	$endif$
	$if(toc)$
	<div id="$idprefix$TOC">
	$toc$
	</div>
	$endif$
	$body$
	$for(include-after)$
	$include-after$
	$endfor$
	</body>
	</html>
	#!/usr/bin/env python3

	import re
	import sys
	import email
	import shlex
	import mimetypes
	import subprocess
	from copy import copy
	from hashlib import md5
	from email import charset
	from email import encoders
	from email.mime.text import MIMEText
	from email.mime.multipart import MIMEMultipart
	from email.mime.nonmultipart import MIMENonMultipart
	from os.path import basename, splitext, expanduser


	charset.add_charset('utf-8', charset.SHORTEST, '8bit')


	def pandoc(from_format, to_format='markdown', plain='markdown', title=None):
	markdown = ('markdown'
	'-blank_before_blockquote')

	if from_format == 'plain':
	from_format = plain
	if from_format == 'markdown':
	from_format = markdown
	if to_format == 'markdown':
	to_format = markdown

	command = 'pandoc -f {} -t {} --standalone --highlight-style=tango'
	if to_format in ('html', 'html5'):
	if title is not None:
	command += ' --variable=pagetitle:{}'.format(shlex.quote(title))
	command += ' --webtex --template={}'.format(
	expanduser('~/.pandoc/templates/email.html'))
	return command.format(from_format, to_format)


	def gmailfy(payload):
	return payload.replace('<blockquote>',
	'<blockquote class="gmail_quote" style="'
	'padding: 0 7px 0 7px;'
	'border-left: 2px solid #cccccc;'
	'font-style: italic;'
	'margin: 0 0 7px 3px;'
	'">')


	def make_alternative(message, part):
	alternative = convert(part, 'html',
	pandoc(part.get_content_subtype(),
	to_format='html',
	title=message.get('Subject')))
	alternative.set_payload(gmailfy(alternative.get_payload()))
	return alternative


	def make_replacement(message, part):
	return convert(part, 'plain', pandoc(part.get_content_subtype()))


	def convert(part, to_subtype, command):
	payload = part.get_payload()
	if isinstance(payload, str):
	payload = payload.encode('utf-8')
	else:
	payload = part.get_payload(None, True)
	if not isinstance(payload, bytes):
	payload = payload.encode('utf-8')
	process = subprocess.run(
	shlex.split(command),
	input=payload, stdout=subprocess.PIPE, check=True)
	return MIMEText(process.stdout, to_subtype, 'utf-8')


	def with_alternative(parent, part, from_signed,
	make_alternative=make_alternative,
	make_replacement=None):
	try:
	alternative = make_alternative(parent or part, from_signed or part)
	replacement = (make_replacement(parent or part, part)
	if from_signed is None and make_replacement is not None
	else part)
	except:
	return parent or part
	envelope = MIMEMultipart('alternative')
	if parent is None:
	for k, v in part.items():
	if (k.lower() != 'mime-version'
	and not k.lower().startswith('content-')):
	envelope.add_header(k, v)
	del part[k]
	envelope.attach(replacement)
	envelope.attach(alternative)
	if parent is None:
	return envelope
	payload = parent.get_payload()
	payload[payload.index(part)] = envelope
	return parent


	def tag_attachments(message):
	if message.get_content_type() == 'multipart/mixed':
	for part in message.get_payload():
	if (part.get_content_maintype() in ['image']
	and 'Content-ID' not in part):
	filename = part.get_param('filename',
	header='Content-Disposition')
	if isinstance(filename, tuple):
	filename = str(filename[2], filename[0] or 'us-ascii')
	if filename:
	filename = splitext(basename(filename))[0]
	if filename:
	part.add_header('Content-ID', '<{}>'.format(filename))
	return message


	def attachment_from_file_path(attachment_path):
	try:
	mime, encoding = mimetypes.guess_type(attachment_path, strict=False)
	maintype, subtype = mime.split('/')
	with open(attachment_path, 'rb') as payload:
	attachment = MIMENonMultipart(maintype, subtype)
	attachment.set_payload(payload.read())
	encoders.encode_base64(attachment)
	if encoding:
	attachment.add_header('Content-Encoding', encoding)
	return attachment
	except:
	return None


	attachment_path_pattern = re.compile(r'\]\s\(\sfile://(/[^)]\S)\s\)\|'
	r'\]\s:\sfile://(/.\S)\s$',
	re.MULTILINE)


	def link_attachments(payload):
	attached = []
	attachments = []

	def on_match(match):
	if match.group(1):
	attachment_path = match.group(1)
	cid_fmt = '](cid:{})'
	else:
	attachment_path = match.group(2)
	cid_fmt = ']: cid:{}'
	attachment_id = md5(attachment_path.encode()).hexdigest()
	if attachment_id in attached:
	return cid_fmt.format(attachment_id)
	attachment = attachment_from_file_path(attachment_path)
	if attachment:
	attachment.add_header('Content-ID', '<{}>'.format(attachment_id))
	attachments.append(attachment)
	attached.append(attachment_id)
	return cid_fmt.format(attachment_id)
	return match.group()

	return attachments, attachment_path_pattern.sub(on_match, payload)


	def with_local_attachments(parent, part, from_signed,
	link_attachments=link_attachments):
	if from_signed is None:
	attachments, payload = link_attachments(part.get_payload())
	part.set_payload(payload)
	else:
	attachments, payload = link_attachments(from_signed.get_payload())
	from_signed = copy(from_signed)
	from_signed.set_payload(payload)
	if not attachments:
	return parent, part, from_signed
	if parent is None:
	parent = MIMEMultipart('mixed')
	for k, v in part.items():
	if (k.lower() != 'mime-version'
	and not k.lower().startswith('content-')):
	parent.add_header(k, v)
	del part[k]
	parent.attach(part)
	for attachment in attachments:
	parent.attach(attachment)
	return parent, part, from_signed


	def is_target(part, target_subtypes):
	return (part.get('Content-Disposition', 'inline') == 'inline'
	and part.get_content_maintype() == 'text'
	and part.get_content_subtype() in target_subtypes)


	def pick_from_signed(part, target_subtypes):
	for from_signed in part.get_payload():
	if is_target(from_signed, target_subtypes):
	return from_signed


	def seek_target(message, target_subtypes=['plain', 'markdown']):
	if message.is_multipart():
	if message.get_content_type() == 'multipart/signed':
	part = pick_from_signed(message, target_subtypes)
	if part is not None:
	return None, message, part
	elif message.get_content_type() == 'multipart/mixed':
	for part in message.get_payload():
	if part.is_multipart():
	if part.get_content_type() == 'multipart/signed':
	from_signed = pick_from_signed(part, target_subtypes)
	if from_signed is not None:
	return message, part, from_signed
	elif is_target(part, target_subtypes):
	return message, part, None
	else:
	if is_target(message, target_subtypes):
	return None, message, None
	return None, None, None


	def main():
	try:
	message = email.message_from_file(sys.stdin)
	parent, part, from_signed = seek_target(message)
	if (parent, part, from_signed) == (None, None, None):
	print(message)
	return
	tag_attachments(message)
	print(with_alternative(
	*with_local_attachments(parent, part, from_signed)))
	except (BrokenPipeError, KeyboardInterrupt):
	pass


	if __name__ == '__main__':
	main()