]> git.madduck.net Git - etc/neomutt.git/blobdiff - .config/neomutt/buildmimetree.py

madduck's git repository

Every one of the projects in this repository is available at the canonical URL git://git.madduck.net/madduck/pub/<projectpath> — see each project's metadata for the exact URL.

All patches and comments are welcome. Please squash your changes to logical commits before using git-format-patch and git-send-email to patches@git.madduck.net. If you'd read over the Git project's submission guidelines and adhered to them, I'd be especially grateful.

SSH access, as well as push access can be individually arranged.

If you use my repositories frequently, consider adding the following snippet to ~/.gitconfig and using the third clone URL listed for each project:

[url "git://git.madduck.net/madduck/"]
  insteadOf = madduck:

v-scroll class for long code
[etc/neomutt.git] / .config / neomutt / buildmimetree.py
index fbc8040061877b74cc0e9fbc4a8e605d21a8a33c..1ff0cb0e9284e8fc7378ac6258aae2e5973a1bc2 100755 (executable)
@@ -28,6 +28,9 @@
 #   - Pynliner, provides --css-file and thus inline styling of HTML output
 #   - Pygments, then syntax highlighting for fenced code is enabled
 #
 #   - Pynliner, provides --css-file and thus inline styling of HTML output
 #   - Pygments, then syntax highlighting for fenced code is enabled
 #
+# Running tests:
+#   pytest -x buildmimetree.py
+#
 # Latest version:
 #   https://git.madduck.net/etc/neomutt.git/blob_plain/HEAD:/.config/neomutt/buildmimetree.py
 #
 # Latest version:
 #   https://git.madduck.net/etc/neomutt.git/blob_plain/HEAD:/.config/neomutt/buildmimetree.py
 #
@@ -36,7 +39,6 @@
 #
 
 import sys
 #
 
 import sys
-import os
 import os.path
 import pathlib
 import markdown
 import os.path
 import pathlib
 import markdown
@@ -45,8 +47,13 @@ import argparse
 import re
 import mimetypes
 import bs4
 import re
 import mimetypes
 import bs4
+import xml.etree.ElementTree as etree
+import io
+import enum
+from contextlib import contextmanager
 from collections import namedtuple, OrderedDict
 from markdown.extensions import Extension
 from collections import namedtuple, OrderedDict
 from markdown.extensions import Extension
+from markdown.blockprocessors import BlockProcessor
 from markdown.inlinepatterns import ImageInlineProcessor, IMAGE_LINK_RE
 from email.utils import make_msgid
 from urllib import request
 from markdown.inlinepatterns import ImageInlineProcessor, IMAGE_LINK_RE
 from email.utils import make_msgid
 from urllib import request
@@ -133,6 +140,13 @@ def parse_cli_args(*args, **kwargs):
         help="Turn on debugging to stderr of the MIME tree walk",
     )
 
         help="Turn on debugging to stderr of the MIME tree walk",
     )
 
+    parser.add_argument(
+        "--dump-html",
+        metavar="FILE",
+        type=pathlib.Path,
+        help="Write the generated HTML to the file",
+    )
+
     subp = parser.add_subparsers(help="Sub-command parsers", dest="mode")
     massage_p = subp.add_parser(
         "massage", help="Massaging phase (internal use)"
     subp = parser.add_subparsers(help="Sub-command parsers", dest="mode")
     massage_p = subp.add_parser(
         "massage", help="Massaging phase (internal use)"
@@ -158,6 +172,172 @@ def parse_cli_args(*args, **kwargs):
     return parser.parse_args(*args, **kwargs)
 
 
     return parser.parse_args(*args, **kwargs)
 
 
+# [ FILE I/O HANDLING ] #######################################################
+
+
+class File:
+
+    class Op(enum.Enum):
+        R = enum.auto()
+        W = enum.auto()
+
+    def __init__(self, path=None, mode="r", content=None, **kwargs):
+        if path:
+            if content:
+                raise RuntimeError("Cannot specify path and content for File")
+
+            self._path = (
+                path if isinstance(path, pathlib.Path) else pathlib.Path(path)
+            )
+        else:
+            self._path = None
+
+        if content and not re.search(r"[r+]", mode):
+            raise RuntimeError("Cannot specify content without read mode")
+
+        self._cache = {
+            File.Op.R: [content] if content else [],
+            File.Op.W: []
+        }
+        self._lastop = None
+        self._mode = mode
+        self._kwargs = kwargs
+        self._file = None
+
+    def open(self):
+        if self._path:
+            self._file = open(self._path, self._mode, **self._kwargs)
+        elif "b" in self._mode:
+            self._file = io.BytesIO()
+        else:
+            self._file = io.StringIO()
+
+    def __enter__(self):
+        self.open()
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.close()
+
+    def close(self):
+        self._file.close()
+        self._file = None
+        self._cache[File.Op.R] = self._cache[File.Op.W]
+        self._lastop = None
+
+    def _get_cache(self, op):
+        return (b"" if "b" in self._mode else "").join(self._cache[op])
+
+    def _add_to_cache(self, op, s):
+        self._cache[op].append(s)
+
+    def read(self, *, cache=True):
+        if cache and self._cache[File.Op.R]:
+            return self._get_cache(File.Op.R)
+
+        if self._lastop == File.Op.W:
+            try:
+                self._file.seek(0)
+            except io.UnsupportedOperation:
+                pass
+
+        self._lastop = File.Op.R
+
+        if cache:
+            self._add_to_cache(File.Op.R, self._file.read())
+            return self._get_cache(File.Op.R)
+        else:
+            return self._file.read()
+
+    def write(self, s, *, cache=True):
+
+        if self._lastop == File.Op.R:
+            try:
+                self._file.seek(0)
+            except io.UnsupportedOperation:
+                pass
+
+        if cache:
+            self._add_to_cache(File.Op.W, s)
+
+        self._cache[File.Op.R] = self._cache[File.Op.W]
+
+        written = self._file.write(s)
+        self._file.flush()
+        self._lastop = File.Op.W
+        return written
+
+    path = property(lambda s: s._path)
+
+    def __repr__(self):
+        return (
+            f'<File path={self._path or "(buffered)"} open={bool(self._file)} '
+            f"rcache={sum(len(c) for c in self._rcache) if self._rcache is not None else False} "
+            f"wcache={sum(len(c) for c in self._wcache) if self._wcache is not None else False}>"
+        )
+
+
+class FileFactory:
+    def __init__(self):
+        self._files = []
+
+    def __call__(self, path=None, mode="r", content=None, **kwargs):
+        f = File(path, mode, content, **kwargs)
+        self._files.append(f)
+        return f
+
+    def __len__(self):
+        return self._files.__len__()
+
+    def pop(self, idx=-1):
+        return self._files.pop(idx)
+
+    def __getitem__(self, idx):
+        return self._files.__getitem__(idx)
+
+    def __contains__(self, f):
+        return self._files.__contains__(f)
+
+
+class FakeFileFactory(FileFactory):
+    def __init__(self):
+        super().__init__()
+        self._paths2files = OrderedDict()
+
+    def __call__(self, path=None, mode="r", content=None, **kwargs):
+        if path in self._paths2files:
+            return self._paths2files[path]
+
+        f = super().__call__(None, mode, content, **kwargs)
+        self._paths2files[path] = f
+
+        mypath = path
+
+        class FakeFile(File):
+            path = mypath
+
+        # this is quality Python! We do this so that the fake file, which has
+        # no path, fake-pretends to have a path for testing purposes.
+
+        f.__class__ = FakeFile
+        return f
+
+    def __getitem__(self, path):
+        return self._paths2files.__getitem__(path)
+
+    def get(self, path, default):
+        return self._paths2files.get(path, default)
+
+    def pop(self, last=True):
+        return self._paths2files.popitem(last)
+
+    def __repr__(self):
+        return (
+            f"<FakeFileFactory nfiles={len(self._files)} "
+            f"paths={len(self._paths2files)}>"
+        )
+
+
 # [ IMAGE HANDLING ] ##########################################################
 
 
 # [ IMAGE HANDLING ] ##########################################################
 
 
@@ -171,6 +351,7 @@ class ImageRegistry:
         self._images = OrderedDict()
 
     def register(self, path, description=None):
         self._images = OrderedDict()
 
     def register(self, path, description=None):
+        # path = str(pathlib.Path(path).expanduser())
         path = os.path.expanduser(path)
         if path.startswith("/"):
             path = f"file://{path}"
         path = os.path.expanduser(path)
         if path.startswith("/"):
             path = f"file://{path}"
@@ -295,6 +476,79 @@ def apply_styling(html, css):
     )
 
 
     )
 
 
+# [ QUOTE HANDLING ] ##########################################################
+
+
+class QuoteToAdmonitionExtension(Extension):
+    class EmailQuoteBlockProcessor(BlockProcessor):
+        RE = re.compile(r"(?:^|\n)>\s*(.*)")
+
+        def __init__(self, parser):
+            super().__init__(parser)
+            self._title = None
+            self._disable = False
+
+        def test(self, parent, blocks):
+            if self._disable:
+                return False
+
+            if markdown.util.nearing_recursion_limit():
+                return False
+
+            lines = blocks.splitlines()
+            if len(lines) < 2:
+                if not self._title:
+                    return False
+
+                elif not self.RE.search(lines[0]):
+                    return False
+
+                return len(lines) > 0
+
+            elif not self.RE.search(lines[0]) and self.RE.search(lines[1]):
+                return True
+
+            elif self._title and self.RE.search(lines[1]):
+                return True
+
+            return False
+
+        def run(self, parent, blocks):
+            quotelines = blocks.pop(0).splitlines()
+
+            cont = bool(self._title)
+            if not self.RE.search(quotelines[0]):
+                self._title = quotelines.pop(0)
+
+            admonition = etree.SubElement(parent, "div")
+            admonition.set(
+                "class", f"admonition quote{' continued' if cont else ''}"
+            )
+            self.parser.parseChunk(admonition, self._title)
+
+            admonition[0].set("class", "admonition-title")
+            with self.disable():
+                self.parser.parseChunk(
+                    admonition, "\n".join(quotelines)
+                )
+
+        @contextmanager
+        def disable(self):
+            self._disable = True
+            yield True
+            self._disable = False
+
+        @classmethod
+        def clean(klass, line):
+            m = klass.RE.match(line)
+            return m.group(1) if m else line
+
+    def extendMarkdown(self, md):
+        md.registerExtension(self)
+        email_quote_proc = self.EmailQuoteBlockProcessor(md.parser)
+        md.parser.blockprocessors.register(email_quote_proc, "emailquote", 25)
+
+
 # [ PARTS GENERATION ] ########################################################
 
 
 # [ PARTS GENERATION ] ########################################################
 
 
@@ -324,18 +578,8 @@ class Multipart(
         return hash(str(self.subtype) + "".join(str(self.children)))
 
 
         return hash(str(self.subtype) + "".join(str(self.children)))
 
 
-def filereader_fn(path, mode="r", **kwargs):
-    with open(path, mode, **kwargs) as in_f:
-        return in_f.read()
-
-
-def filewriter_fn(path, content, mode="w", **kwargs):
-    with open(path, mode, **kwargs) as out_f:
-        out_f.write(content)
-
-
 def collect_inline_images(
 def collect_inline_images(
-    image_registry, *, tempdir=None, filewriter_fn=filewriter_fn
+    image_registry, *, tempdir=None, filefactory=FileFactory()
 ):
     relparts = []
     for path, info in image_registry.items():
 ):
     relparts = []
     for path, info in image_registry.items():
@@ -349,7 +593,10 @@ def collect_inline_images(
         tempfilename = tempfile.mkstemp(prefix="img", suffix=ext, dir=tempdir)
         path = pathlib.Path(tempfilename[1])
 
         tempfilename = tempfile.mkstemp(prefix="img", suffix=ext, dir=tempdir)
         path = pathlib.Path(tempfilename[1])
 
-        filewriter_fn(path, data.read(), "w+b")
+        with filefactory(path, "w+b") as out_f:
+            out_f.write(data.read())
+
+        # filewriter_fn(path, data.read(), "w+b")
 
         desc = (
             f'Inline image: "{info.desc}"'
 
         desc = (
             f'Inline image: "{info.desc}"'
@@ -394,7 +641,7 @@ def make_text_mail(text, sig=None):
     return EMAIL_SIG_SEP.join((text, sig)) if sig else text
 
 
     return EMAIL_SIG_SEP.join((text, sig)) if sig else text
 
 
-def extract_signature(text, *, filereader_fn=filereader_fn):
+def extract_signature(text, *, filefactory=FileFactory()):
     parts = text.split(EMAIL_SIG_SEP, 1)
     if len(parts) == 1:
         return text, None, None
     parts = text.split(EMAIL_SIG_SEP, 1)
     if len(parts) == 1:
         return text, None, None
@@ -404,7 +651,9 @@ def extract_signature(text, *, filereader_fn=filereader_fn):
         path = pathlib.Path(re.split(r" +", lines.pop(0), maxsplit=1)[1])
         textsig = "\n".join(lines)
 
         path = pathlib.Path(re.split(r" +", lines.pop(0), maxsplit=1)[1])
         textsig = "\n".join(lines)
 
-        sig_input = filereader_fn(path.expanduser())
+        with filefactory(path.expanduser()) as sig_f:
+            sig_input = sig_f.read()
+
         soup = bs4.BeautifulSoup(sig_input, "html.parser")
 
         style = str(soup.style.extract()) if soup.style else ""
         soup = bs4.BeautifulSoup(sig_input, "html.parser")
 
         style = str(soup.style.extract()) if soup.style else ""
@@ -434,24 +683,28 @@ def extract_signature(text, *, filereader_fn=filereader_fn):
 
 
 def convert_markdown_to_html(
 
 
 def convert_markdown_to_html(
-    origtext,
-    draftpath,
+    draft_f,
     *,
     related_to_html_only=False,
     *,
     related_to_html_only=False,
-    css=None,
-    filewriter_fn=filewriter_fn,
-    filereader_fn=filereader_fn,
+    css_f=None,
+    htmldump_f=None,
+    filefactory=FileFactory(),
     tempdir=None,
     extensions=None,
     extension_configs=None,
 ):
     # TODO extension_configs need to be handled differently
     extension_configs = extension_configs or {}
     tempdir=None,
     extensions=None,
     extension_configs=None,
 ):
     # TODO extension_configs need to be handled differently
     extension_configs = extension_configs or {}
-    extension_configs.setdefault("pymdownx.highlight", {})
-    extension_configs["pymdownx.highlight"]["css_class"] = _CODEHILITE_CLASS
+    extension_configs.setdefault("pymdownx.highlight", {})[
+        "css_class"
+    ] = _CODEHILITE_CLASS
+
+    extensions = extensions or []
+    extensions.append(QuoteToAdmonitionExtension())
 
 
+    draft = draft_f.read()
     origtext, textsig, htmlsig = extract_signature(
     origtext, textsig, htmlsig = extract_signature(
-        origtext, filereader_fn=filereader_fn
+        draft, filefactory=filefactory
     )
 
     (
     )
 
     (
@@ -492,23 +745,31 @@ def convert_markdown_to_html(
         )
 
     origtext = make_text_mail(origtext, textsig)
         )
 
     origtext = make_text_mail(origtext, textsig)
-
-    filewriter_fn(draftpath, origtext, encoding="utf-8")
+    draft_f.write(origtext)
     textpart = Part(
     textpart = Part(
-        "text", "plain", draftpath, "Plain-text version", orig=True
+        "text", "plain", draft_f.path, "Plain-text version", orig=True
     )
 
     htmltext = make_html_doc(htmltext, htmlsig)
     )
 
     htmltext = make_html_doc(htmltext, htmlsig)
-    htmltext = apply_styling(htmltext, css)
+    htmltext = apply_styling(htmltext, css_f.read() if css_f else None)
 
 
-    htmlpath = draftpath.with_suffix(".html")
-    filewriter_fn(
-        htmlpath, htmltext, encoding="utf-8", errors="xmlcharrefreplace"
-    )
+    if draft_f.path:
+        htmlpath = draft_f.path.with_suffix(".html")
+    else:
+        htmlpath = pathlib.Path(
+            tempfile.mkstemp(suffix=".html", dir=tempdir)[1]
+        )
+    with filefactory(
+        htmlpath, "w", encoding="utf-8", errors="xmlcharrefreplace"
+    ) as out_f:
+        out_f.write(htmltext)
     htmlpart = Part("text", "html", htmlpath, "HTML version")
 
     htmlpart = Part("text", "html", htmlpath, "HTML version")
 
+    if htmldump_f:
+        htmldump_f.write(htmltext)
+
     imgparts = collect_inline_images(
     imgparts = collect_inline_images(
-        image_registry, tempdir=tempdir, filewriter_fn=filewriter_fn
+        image_registry, tempdir=tempdir, filefactory=filefactory
     )
 
     if related_to_html_only:
     )
 
     if related_to_html_only:
@@ -684,11 +945,11 @@ def do_setup(
 
 def do_massage(
     draft_f,
 
 def do_massage(
     draft_f,
-    draftpath,
     cmd_f,
     *,
     extensions=None,
     css_f=None,
     cmd_f,
     *,
     extensions=None,
     css_f=None,
+    htmldump_f=None,
     converter=convert_markdown_to_html,
     related_to_html_only=True,
     only_build=False,
     converter=convert_markdown_to_html,
     related_to_html_only=True,
     only_build=False,
@@ -706,20 +967,12 @@ def do_massage(
     # variable used to identify the command file we're currently writing
     # to.
     cmds = MuttCommands(cmd_f, debug=debug_commands)
     # variable used to identify the command file we're currently writing
     # to.
     cmds = MuttCommands(cmd_f, debug=debug_commands)
-    cmds.cmd('set editor="$my_editor"')
-    cmds.cmd('set edit_headers="$my_edit_headers"')
-    cmds.cmd("unset my_editor")
-    cmds.cmd("unset my_edit_headers")
-
-    # let's flush those commands, as there'll be a lot of pushes from now
-    # on, which need to be run in reverse order
-    cmds.flush()
 
     extensions = extensions.split(",") if extensions else []
     tree = converter(
 
     extensions = extensions.split(",") if extensions else []
     tree = converter(
-        draft_f.read(),
-        draftpath,
-        css=css_f.read() if css_f else None,
+        draft_f,
+        css_f=css_f,
+        htmldump_f=htmldump_f,
         related_to_html_only=related_to_html_only,
         tempdir=tempdir,
         extensions=extensions,
         related_to_html_only=related_to_html_only,
         tempdir=tempdir,
         extensions=extensions,
@@ -859,6 +1112,10 @@ def do_massage(
     except AttributeError:
         filename = "pytest_internal_file"
     cmds.cmd(f"source 'rm -f {filename}|'")
     except AttributeError:
         filename = "pytest_internal_file"
     cmds.cmd(f"source 'rm -f {filename}|'")
+    cmds.cmd('set editor="$my_editor"')
+    cmds.cmd('set edit_headers="$my_edit_headers"')
+    cmds.cmd("unset my_editor")
+    cmds.cmd("unset my_edit_headers")
     cmds.cmd("unset my_mdwn_postprocess_cmd_file")
     cmds.flush()
 
     cmds.cmd("unset my_mdwn_postprocess_cmd_file")
     cmds.flush()
 
@@ -875,15 +1132,18 @@ if __name__ == "__main__":
         )
 
     elif args.mode == "massage":
         )
 
     elif args.mode == "massage":
-        with open(args.MAILDRAFT, "r") as draft_f, open(
-            args.cmdpath, "w"
-        ) as cmd_f, open(args.css_file, "r") as css_f:
+        with (
+            File(args.MAILDRAFT, "r+") as draft_f,
+            File(args.cmdpath, "w") as cmd_f,
+            File(args.css_file, "r") as css_f,
+            File(args.dump_html, "w") as htmldump_f,
+        ):
             do_massage(
                 draft_f,
             do_massage(
                 draft_f,
-                args.MAILDRAFT,
                 cmd_f,
                 extensions=args.extensions,
                 css_f=css_f,
                 cmd_f,
                 extensions=args.extensions,
                 css_f=css_f,
+                htmldump_f=htmldump_f,
                 related_to_html_only=args.related_to_html_only,
                 max_other_attachments=args.max_number_other_attachments,
                 only_build=args.only_build,
                 related_to_html_only=args.related_to_html_only,
                 max_other_attachments=args.max_number_other_attachments,
                 only_build=args.only_build,
@@ -897,16 +1157,23 @@ if __name__ == "__main__":
 
 try:
     import pytest
 
 try:
     import pytest
-    from io import StringIO
 
     class Tests:
         @pytest.fixture
         def const1(self):
 
     class Tests:
         @pytest.fixture
         def const1(self):
-            return "CONSTANT STRING 1"
+            return "Curvature Vest Usher Dividing+T#iceps Senior"
 
         @pytest.fixture
         def const2(self):
 
         @pytest.fixture
         def const2(self):
-            return "CONSTANT STRING 2"
+            return "Habitant Celestial 2litzy Resurf/ce Headpiece Harmonics"
+
+        @pytest.fixture
+        def fakepath(self):
+            return pathlib.Path("/does/not/exist")
+
+        @pytest.fixture
+        def fakepath2(self):
+            return pathlib.Path("/does/not/exist/either")
 
         # NOTE: tests using the capsys fixture must specify sys.stdout to the
         # functions they call, else old stdout is used and not captured
 
         # NOTE: tests using the capsys fixture must specify sys.stdout to the
         # functions they call, else old stdout is used and not captured
@@ -1021,6 +1288,53 @@ try:
                 desc="Alternative",
             )
 
                 desc="Alternative",
             )
 
+        @pytest.fixture
+        def mime_tree_nested(self):
+            return Multipart(
+                "relative",
+                children=[
+                    Multipart(
+                        "alternative",
+                        children=[
+                            Part(
+                                "text",
+                                "plain",
+                                "part.txt",
+                                desc="Plain",
+                                orig=True,
+                            ),
+                            Multipart(
+                                "alternative",
+                                children=[
+                                    Part(
+                                        "text",
+                                        "plain",
+                                        "part.txt",
+                                        desc="Nested plain",
+                                    ),
+                                    Part(
+                                        "text",
+                                        "html",
+                                        "part.html",
+                                        desc="Nested HTML",
+                                    ),
+                                ],
+                                desc="Nested alternative",
+                            ),
+                        ],
+                        desc="Alternative",
+                    ),
+                    Part(
+                        "text",
+                        "png",
+                        "logo.png",
+                        cid="logo.png",
+                        desc="Logo",
+                    ),
+                ],
+                desc="Related",
+            )
+
         @pytest.mark.treewalk
         def test_MIMETreeDFWalker_depth_first_walk(
             self, mime_tree_related_to_alternative
         @pytest.mark.treewalk
         def test_MIMETreeDFWalker_depth_first_walk(
             self, mime_tree_related_to_alternative
@@ -1084,61 +1398,44 @@ try:
             return StringIO(text or const1)
 
         @pytest.mark.massage
             return StringIO(text or const1)
 
         @pytest.mark.massage
-        def test_do_massage_basic(self, const1, string_io, capsys):
-            def converter(
-                drafttext,
-                draftpath,
-                css,
-                related_to_html_only,
-                extensions,
-                tempdir,
-            ):
-                return Part("text", "plain", draftpath, orig=True)
+        def test_do_massage_basic(self):
+            def converter(draft_f, **kwargs):
+                return Part("text", "plain", draft_f.path, orig=True)
 
 
-            do_massage(
-                draft_f=string_io,
-                draftpath=const1,
-                cmd_f=sys.stdout,
-                converter=converter,
-            )
+            with File() as draft_f, File() as cmd_f:
+                do_massage(
+                    draft_f=draft_f,
+                    cmd_f=cmd_f,
+                    converter=converter,
+                )
+                lines = cmd_f.read().splitlines()
 
 
-            captured = capsys.readouterr()
-            lines = captured.out.splitlines()
-            assert '="$my_editor"' in lines.pop(0)
-            assert '="$my_edit_headers"' in lines.pop(0)
-            assert "unset my_editor" == lines.pop(0)
-            assert "unset my_edit_headers" == lines.pop(0)
             assert "send-message" in lines.pop(0)
             assert "update-encoding" in lines.pop(0)
             assert "first-entry" in lines.pop(0)
             assert "source 'rm -f " in lines.pop(0)
             assert "send-message" in lines.pop(0)
             assert "update-encoding" in lines.pop(0)
             assert "first-entry" in lines.pop(0)
             assert "source 'rm -f " in lines.pop(0)
+            assert '="$my_editor"' in lines.pop(0)
+            assert '="$my_edit_headers"' in lines.pop(0)
+            assert "unset my_editor" == lines.pop(0)
+            assert "unset my_edit_headers" == lines.pop(0)
             assert "unset my_mdwn_postprocess_cmd_file" == lines.pop(0)
 
         @pytest.mark.massage
             assert "unset my_mdwn_postprocess_cmd_file" == lines.pop(0)
 
         @pytest.mark.massage
-        def test_do_massage_fulltree(
-            self, string_io, const1, mime_tree_related_to_alternative, capsys
-        ):
-            def converter(
-                drafttext,
-                draftpath,
-                css,
-                related_to_html_only,
-                extensions,
-                tempdir,
-            ):
+        def test_do_massage_fulltree(self, mime_tree_related_to_alternative):
+            def converter(draft_f, **kwargs):
                 return mime_tree_related_to_alternative
 
             max_attachments = 5
                 return mime_tree_related_to_alternative
 
             max_attachments = 5
-            do_massage(
-                draft_f=string_io,
-                draftpath=const1,
-                cmd_f=sys.stdout,
-                max_other_attachments=max_attachments,
-                converter=converter,
-            )
 
 
-            captured = capsys.readouterr()
-            lines = captured.out.splitlines()[4:-2]
+            with File() as draft_f, File() as cmd_f:
+                do_massage(
+                    draft_f=draft_f,
+                    cmd_f=cmd_f,
+                    max_other_attachments=max_attachments,
+                    converter=converter,
+                )
+                lines = cmd_f.read().splitlines()[:-6]
+
             assert "first-entry" in lines.pop()
             assert "update-encoding" in lines.pop()
             assert "Plain" in lines.pop()
             assert "first-entry" in lines.pop()
             assert "update-encoding" in lines.pop()
             assert "Plain" in lines.pop()
@@ -1166,59 +1463,115 @@ try:
             assert "send-message" in lines.pop()
             assert len(lines) == 0
 
             assert "send-message" in lines.pop()
             assert len(lines) == 0
 
-        @pytest.fixture
-        def fake_filewriter(self):
-            class FileWriter:
-                def __init__(self):
-                    self._writes = []
+        @pytest.mark.massage
+        def test_mime_tree_relative_within_alternative(
+            self, mime_tree_related_to_html
+        ):
+            def converter(draft_f, **kwargs):
+                return mime_tree_related_to_html
 
 
-                def __call__(self, path, content, mode="w", **kwargs):
-                    self._writes.append((path, content))
+            with File() as draft_f, File() as cmd_f:
+                do_massage(
+                    draft_f=draft_f,
+                    cmd_f=cmd_f,
+                    converter=converter,
+                )
+                lines = cmd_f.read().splitlines()[:-6]
 
 
-                def pop(self, index=-1):
-                    return self._writes.pop(index)
+            assert "first-entry" in lines.pop()
+            assert "update-encoding" in lines.pop()
+            assert "Plain" in lines.pop()
+            assert "part.html" in lines.pop()
+            assert "toggle-unlink" in lines.pop()
+            assert "move-up" in lines.pop()
+            while True:
+                top = lines.pop()
+                if "move-up" not in top:
+                    break
+            assert "move-down" in top
+            assert "HTML" in lines.pop()
+            assert "logo.png" in lines.pop()
+            assert "toggle-unlink" in lines.pop()
+            assert "content-id" in lines.pop()
+            assert "move-up" in lines.pop()
+            while True:
+                top = lines.pop()
+                if "move-up" not in top:
+                    break
+            assert "move-down" in top
+            assert "move-down" in lines.pop()
+            assert "Logo" in lines.pop()
+            assert "jump>2" in lines.pop()
+            assert "jump>3" in lines.pop()
+            assert "group-related" in lines.pop()
+            assert "Related" in lines.pop()
+            assert "jump>1" in lines.pop()
+            assert "jump>2" in lines.pop()
+            assert "group-alternative" in lines.pop()
+            assert "Alternative" in lines.pop()
+            assert "send-message" in lines.pop()
+            assert len(lines) == 0
 
 
-            return FileWriter()
+        @pytest.mark.massage
+        def test_mime_tree_nested_trees_does_not_break_positioning(
+            self, mime_tree_nested
+        ):
+            def converter(draft_f, **kwargs):
+                return mime_tree_nested
 
 
-        @pytest.fixture
-        def markdown_non_converter(self, const1, const2):
-            return lambda s, text: f"{const1}{text}{const2}"
+            with File() as draft_f, File() as cmd_f:
+                do_massage(
+                    draft_f=draft_f,
+                    cmd_f=cmd_f,
+                    converter=converter,
+                )
+                lines = cmd_f.read().splitlines()
+
+            while "logo.png" not in lines.pop():
+                pass
+            lines.pop()
+            assert "content-id" in lines.pop()
+            assert "move-up" in lines.pop()
+            while True:
+                top = lines.pop()
+                if "move-up" not in top:
+                    break
+            assert "move-down" in top
+            # Due to the nested trees, the number of descendents of the sibling
+            # actually needs to be considered, not just the nieces. So to move
+            # from position 1 to position 6, it only needs one <move-down>
+            # because that jumps over the entire sibling tree. Thus what
+            # follows next must not be another <move-down>
+            assert "Logo" in lines.pop()
 
         @pytest.mark.converter
 
         @pytest.mark.converter
-        def test_converter_tree_basic(self, const1, const2, fake_filewriter):
-            path = pathlib.Path(const2)
-            tree = convert_markdown_to_html(
-                const1, path, filewriter_fn=fake_filewriter
-            )
+        def test_converter_tree_basic(self, fakepath, const1, fakefilefactory):
+            with fakefilefactory(fakepath, content=const1) as draft_f:
+                tree = convert_markdown_to_html(
+                    draft_f, filefactory=fakefilefactory
+                )
 
             assert tree.subtype == "alternative"
             assert len(tree.children) == 2
             assert tree.children[0].subtype == "plain"
 
             assert tree.subtype == "alternative"
             assert len(tree.children) == 2
             assert tree.children[0].subtype == "plain"
-            assert tree.children[0].path == path
+            assert tree.children[0].path == draft_f.path
             assert tree.children[0].orig
             assert tree.children[1].subtype == "html"
             assert tree.children[0].orig
             assert tree.children[1].subtype == "html"
-            assert tree.children[1].path == path.with_suffix(".html")
+            assert tree.children[1].path == fakepath.with_suffix(".html")
 
 
+        @pytest.mark.converter
         def test_converter_writes(
         def test_converter_writes(
-            self,
-            const1,
-            const2,
-            fake_filewriter,
-            monkeypatch,
-            markdown_non_converter,
+            self, fakepath, fakefilefactory, const1, monkeypatch
         ):
         ):
-            path = pathlib.Path(const2)
-
-            with monkeypatch.context() as m:
-                m.setattr(markdown.Markdown, "convert", markdown_non_converter)
-                convert_markdown_to_html(
-                    const1, path, filewriter_fn=fake_filewriter
-                )
+            with fakefilefactory(fakepath, content=const1) as draft_f:
+                convert_markdown_to_html(draft_f, filefactory=fakefilefactory)
 
 
-            assert (path, const1) == fake_filewriter.pop(0)
-            written = fake_filewriter.pop(0)
-            assert path.with_suffix(".html") == written[0]
-            assert const1 in written[1]
+            html = fakefilefactory.pop()
+            assert fakepath.with_suffix(".html") == html[0]
+            assert const1 in html[1].read()
+            text = fakefilefactory.pop()
+            assert fakepath == text[0]
+            assert const1 == text[1].read()
 
         @pytest.mark.imgproc
         def test_markdown_inline_image_processor(self):
 
         @pytest.mark.imgproc
         def test_markdown_inline_image_processor(self):
@@ -1316,76 +1669,77 @@ try:
 
         @pytest.mark.converter
         def test_converter_tree_inline_image_base64(
 
         @pytest.mark.converter
         def test_converter_tree_inline_image_base64(
-            self, test_png, const1, fake_filewriter
+            self, test_png, fakefilefactory
         ):
             text = f"![inline base64 image]({test_png})"
         ):
             text = f"![inline base64 image]({test_png})"
-            path = pathlib.Path(const1)
-            tree = convert_markdown_to_html(
-                text,
-                path,
-                filewriter_fn=fake_filewriter,
-                related_to_html_only=False,
-            )
+            with fakefilefactory(content=text) as draft_f:
+                tree = convert_markdown_to_html(
+                    draft_f,
+                    filefactory=fakefilefactory,
+                    related_to_html_only=False,
+                )
             assert tree.subtype == "relative"
             assert tree.children[0].subtype == "alternative"
             assert tree.children[1].subtype == "png"
             assert tree.subtype == "relative"
             assert tree.children[0].subtype == "alternative"
             assert tree.children[1].subtype == "png"
-            written = fake_filewriter.pop()
+            written = fakefilefactory.pop()
             assert tree.children[1].path == written[0]
             assert tree.children[1].path == written[0]
-            assert written[1] == request.urlopen(test_png).read()
+            assert b"PNG" in written[1].read()
 
         @pytest.mark.converter
         def test_converter_tree_inline_image_base64_related_to_html(
 
         @pytest.mark.converter
         def test_converter_tree_inline_image_base64_related_to_html(
-            self, test_png, const1, fake_filewriter
+            self, test_png, fakefilefactory
         ):
             text = f"![inline base64 image]({test_png})"
         ):
             text = f"![inline base64 image]({test_png})"
-            path = pathlib.Path(const1)
-            tree = convert_markdown_to_html(
-                text,
-                path,
-                filewriter_fn=fake_filewriter,
-                related_to_html_only=True,
-            )
+            with fakefilefactory(content=text) as draft_f:
+                tree = convert_markdown_to_html(
+                    draft_f,
+                    filefactory=fakefilefactory,
+                    related_to_html_only=True,
+                )
             assert tree.subtype == "alternative"
             assert tree.children[1].subtype == "relative"
             assert tree.children[1].children[1].subtype == "png"
             assert tree.subtype == "alternative"
             assert tree.children[1].subtype == "relative"
             assert tree.children[1].children[1].subtype == "png"
-            written = fake_filewriter.pop()
+            written = fakefilefactory.pop()
             assert tree.children[1].children[1].path == written[0]
             assert tree.children[1].children[1].path == written[0]
-            assert written[1] == request.urlopen(test_png).read()
+            assert b"PNG" in written[1].read()
 
         @pytest.mark.converter
         def test_converter_tree_inline_image_cid(
 
         @pytest.mark.converter
         def test_converter_tree_inline_image_cid(
-            self, const1, fake_filewriter
+            self, const1, fakefilefactory
         ):
             text = f"![inline base64 image](cid:{const1})"
         ):
             text = f"![inline base64 image](cid:{const1})"
-            path = pathlib.Path(const1)
-            tree = convert_markdown_to_html(
-                text,
-                path,
-                filewriter_fn=fake_filewriter,
-                related_to_html_only=False,
-            )
+            with fakefilefactory(content=text) as draft_f:
+                tree = convert_markdown_to_html(
+                    draft_f,
+                    filefactory=fakefilefactory,
+                    related_to_html_only=False,
+                )
             assert len(tree.children) == 2
             assert tree.children[0].cid != const1
             assert tree.children[0].type != "image"
             assert tree.children[1].cid != const1
             assert tree.children[1].type != "image"
 
             assert len(tree.children) == 2
             assert tree.children[0].cid != const1
             assert tree.children[0].type != "image"
             assert tree.children[1].cid != const1
             assert tree.children[1].type != "image"
 
+        @pytest.fixture
+        def fakefilefactory(self):
+            return FakeFileFactory()
+
         @pytest.mark.imgcoll
         def test_inline_image_collection(
         @pytest.mark.imgcoll
         def test_inline_image_collection(
-            self, test_png, const1, const2, fake_filewriter
+            self, test_png, const1, const2, fakefilefactory
         ):
             test_images = {test_png: InlineImageInfo(cid=const1, desc=const2)}
             relparts = collect_inline_images(
         ):
             test_images = {test_png: InlineImageInfo(cid=const1, desc=const2)}
             relparts = collect_inline_images(
-                test_images, filewriter_fn=fake_filewriter
+                test_images, filefactory=fakefilefactory
             )
 
             )
 
-            written = fake_filewriter.pop()
-            assert b"PNG" in written[1]
+            written = fakefilefactory.pop()
+            assert b"PNG" in written[1].read()
 
             assert relparts[0].subtype == "png"
             assert relparts[0].path == written[0]
             assert relparts[0].cid == const1
 
             assert relparts[0].subtype == "png"
             assert relparts[0].path == written[0]
             assert relparts[0].cid == const1
-            assert relparts[0].desc.endswith(const2)
+            assert const2 in relparts[0].desc
 
         if _PYNLINER:
 
 
         if _PYNLINER:
 
@@ -1397,49 +1751,56 @@ try:
                 assert 'p style="color' in out
 
             @pytest.mark.styling
                 assert 'p style="color' in out
 
             @pytest.mark.styling
-            def test_massage_styling_to_converter(self, string_io, const1):
+            def test_apply_no_stylesheet(self, const1):
+                out = apply_styling(const1, None)
+
+            @pytest.mark.massage
+            @pytest.mark.styling
+            def test_massage_styling_to_converter(self):
                 css = "p { color:red }"
                 css = "p { color:red }"
-                css_f = StringIO(css)
-                out_f = StringIO()
                 css_applied = []
 
                 css_applied = []
 
-                def converter(
-                    drafttext,
-                    draftpath,
-                    css,
-                    related_to_html_only,
-                    extensions,
-                    tempdir,
-                ):
+                def converter(draft_f, css_f, **kwargs):
+                    css = css_f.read()
                     css_applied.append(css)
                     css_applied.append(css)
-                    return Part("text", "plain", draftpath, orig=True)
+                    return Part("text", "plain", draft_f.path, orig=True)
 
 
-                do_massage(
-                    draft_f=string_io,
-                    draftpath=const1,
-                    cmd_f=out_f,
-                    css_f=css_f,
-                    converter=converter,
-                )
+                with (
+                    File() as draft_f,
+                    File(mode="w") as cmd_f,
+                    File(content=css) as css_f
+                ):
+                    do_massage(
+                        draft_f=draft_f,
+                        cmd_f=cmd_f,
+                        css_f=css_f,
+                        converter=converter,
+                    )
                 assert css_applied[0] == css
 
             @pytest.mark.converter
                 assert css_applied[0] == css
 
             @pytest.mark.converter
+            @pytest.mark.styling
             def test_converter_apply_styles(
             def test_converter_apply_styles(
-                self, const1, fake_filewriter, monkeypatch
+                self, const1, monkeypatch, fakepath, fakefilefactory
             ):
             ):
-                path = pathlib.Path(const1)
-                text = "Hello, world!"
                 css = "p { color:red }"
                 css = "p { color:red }"
-                with monkeypatch.context() as m:
+                with (
+                    monkeypatch.context() as m,
+                    fakefilefactory(fakepath, content=const1) as draft_f,
+                    fakefilefactory(content=css) as css_f,
+                ):
                     m.setattr(
                         markdown.Markdown,
                         "convert",
                         lambda s, t: f"<p>{t}</p>",
                     )
                     convert_markdown_to_html(
                     m.setattr(
                         markdown.Markdown,
                         "convert",
                         lambda s, t: f"<p>{t}</p>",
                     )
                     convert_markdown_to_html(
-                        text, path, css=css, filewriter_fn=fake_filewriter
+                        draft_f, css_f=css_f, filefactory=fakefilefactory
                     )
                     )
-                assert "color: red" in fake_filewriter.pop()[1]
+                assert re.search(
+                    r"color:.*red",
+                    fakefilefactory[fakepath.with_suffix(".html")].read(),
+                )
 
         if _PYGMENTS_CSS:
 
 
         if _PYGMENTS_CSS:
 
@@ -1452,146 +1813,6 @@ try:
                 out = apply_styling(html, _PYGMENTS_CSS)
                 assert f'{_CODEHILITE_CLASS}" style="' in out
 
                 out = apply_styling(html, _PYGMENTS_CSS)
                 assert f'{_CODEHILITE_CLASS}" style="' in out
 
-        @pytest.mark.massage
-        def test_mime_tree_relative_within_alternative(
-            self, string_io, const1, capsys, mime_tree_related_to_html
-        ):
-            def converter(
-                drafttext,
-                draftpath,
-                css,
-                related_to_html_only,
-                extensions,
-                tempdir,
-            ):
-                return mime_tree_related_to_html
-
-            do_massage(
-                draft_f=string_io,
-                draftpath=const1,
-                cmd_f=sys.stdout,
-                converter=converter,
-            )
-
-            captured = capsys.readouterr()
-            lines = captured.out.splitlines()[4:-2]
-            assert "first-entry" in lines.pop()
-            assert "update-encoding" in lines.pop()
-            assert "Plain" in lines.pop()
-            assert "part.html" in lines.pop()
-            assert "toggle-unlink" in lines.pop()
-            assert "move-up" in lines.pop()
-            while True:
-                top = lines.pop()
-                if "move-up" not in top:
-                    break
-            assert "move-down" in top
-            assert "HTML" in lines.pop()
-            assert "logo.png" in lines.pop()
-            assert "toggle-unlink" in lines.pop()
-            assert "content-id" in lines.pop()
-            assert "move-up" in lines.pop()
-            while True:
-                top = lines.pop()
-                if "move-up" not in top:
-                    break
-            assert "move-down" in top
-            assert "move-down" in lines.pop()
-            assert "Logo" in lines.pop()
-            assert "jump>2" in lines.pop()
-            assert "jump>3" in lines.pop()
-            assert "group-related" in lines.pop()
-            assert "Related" in lines.pop()
-            assert "jump>1" in lines.pop()
-            assert "jump>2" in lines.pop()
-            assert "group-alternative" in lines.pop()
-            assert "Alternative" in lines.pop()
-            assert "send-message" in lines.pop()
-            assert len(lines) == 0
-
-        @pytest.mark.massage
-        def test_mime_tree_nested_trees_does_not_break_positioning(
-            self, string_io, const1, capsys
-        ):
-            def converter(
-                drafttext,
-                draftpath,
-                css,
-                related_to_html_only,
-                extensions,
-                tempdir,
-            ):
-                return Multipart(
-                    "relative",
-                    children=[
-                        Multipart(
-                            "alternative",
-                            children=[
-                                Part(
-                                    "text",
-                                    "plain",
-                                    "part.txt",
-                                    desc="Plain",
-                                    orig=True,
-                                ),
-                                Multipart(
-                                    "alternative",
-                                    children=[
-                                        Part(
-                                            "text",
-                                            "plain",
-                                            "part.txt",
-                                            desc="Nested plain",
-                                        ),
-                                        Part(
-                                            "text",
-                                            "html",
-                                            "part.html",
-                                            desc="Nested HTML",
-                                        ),
-                                    ],
-                                    desc="Nested alternative",
-                                ),
-                            ],
-                            desc="Alternative",
-                        ),
-                        Part(
-                            "text",
-                            "png",
-                            "logo.png",
-                            cid="logo.png",
-                            desc="Logo",
-                        ),
-                    ],
-                    desc="Related",
-                )
-
-            do_massage(
-                draft_f=string_io,
-                draftpath=const1,
-                cmd_f=sys.stdout,
-                converter=converter,
-            )
-
-            captured = capsys.readouterr()
-            lines = captured.out.splitlines()
-            while "logo.png" not in lines.pop():
-                pass
-            lines.pop()
-            assert "content-id" in lines.pop()
-            assert "move-up" in lines.pop()
-            while True:
-                top = lines.pop()
-                if "move-up" not in top:
-                    break
-            assert "move-down" in top
-            # Due to the nested trees, the number of descendents of the sibling
-            # actually needs to be considered, not just the nieces. So to move
-            # from position 1 to position 6, it only needs one <move-down>
-            # because that jumps over the entire sibling tree. Thus what
-            # follows next must not be another <move-down>
-            assert "Logo" in lines.pop()
-
         @pytest.mark.sig
         def test_signature_extraction_no_signature(self, const1):
             assert (const1, None, None) == extract_signature(const1)
         @pytest.mark.sig
         def test_signature_extraction_no_signature(self, const1):
             assert (const1, None, None) == extract_signature(const1)
@@ -1606,29 +1827,27 @@ try:
             assert htmlsig is None
 
         @pytest.mark.sig
             assert htmlsig is None
 
         @pytest.mark.sig
-        def test_signature_extraction_html(self, const1, const2):
-            path = pathlib.Path("somepath")
+        def test_signature_extraction_html(
+            self, fakepath, fakefilefactory, const1, const2
+        ):
             sigconst = "HTML signature from {path} but as a string"
             sigconst = "HTML signature from {path} but as a string"
+            sig = f'<div id="signature">{sigconst.format(path=fakepath)}</div>'
 
 
-            def filereader_fn(path):
-                return (
-                    f'<div id="signature">{sigconst.format(path=path)}</div>'
-                )
+            sig_f = fakefilefactory(fakepath, content=sig)
 
             origtext, textsig, htmlsig = extract_signature(
 
             origtext, textsig, htmlsig = extract_signature(
-                f"{const1}{EMAIL_SIG_SEP}{HTML_SIG_MARKER} {path}\n{const2}",
-                filereader_fn=filereader_fn,
+                f"{const1}{EMAIL_SIG_SEP}{HTML_SIG_MARKER} {fakepath}\n{const2}",
+                filefactory=fakefilefactory,
             )
             assert origtext == const1
             assert textsig == const2
             )
             assert origtext == const1
             assert textsig == const2
-            assert htmlsig == sigconst.format(path=path)
+            assert htmlsig == sigconst.format(path=fakepath)
 
         @pytest.mark.sig
 
         @pytest.mark.sig
-        def test_signature_extraction_file_not_found(self, const1):
-            path = pathlib.Path("/does/not/exist")
+        def test_signature_extraction_file_not_found(self, fakepath, const1):
             with pytest.raises(FileNotFoundError):
                 origtext, textsig, htmlsig = extract_signature(
             with pytest.raises(FileNotFoundError):
                 origtext, textsig, htmlsig = extract_signature(
-                    f"{const1}{EMAIL_SIG_SEP}{HTML_SIG_MARKER}{path}\n{const1}"
+                    f"{const1}{EMAIL_SIG_SEP}{HTML_SIG_MARKER}{fakepath}\n{const1}"
                 )
 
         @pytest.mark.imgproc
                 )
 
         @pytest.mark.imgproc
@@ -1651,29 +1870,27 @@ try:
         @pytest.mark.converter
         @pytest.mark.sig
         def test_converter_signature_handling(
         @pytest.mark.converter
         @pytest.mark.sig
         def test_converter_signature_handling(
-            self, const1, fake_filewriter, monkeypatch
+            self, fakepath, fakefilefactory, monkeypatch
         ):
         ):
-            path = pathlib.Path(const1)
-
             mailparts = (
                 "This is the mail body\n",
                 f"{EMAIL_SIG_SEP}",
                 "This is a plain-text signature only",
             )
 
             mailparts = (
                 "This is the mail body\n",
                 f"{EMAIL_SIG_SEP}",
                 "This is a plain-text signature only",
             )
 
-            def filereader_fn(path):
-                return ""
-
-            with monkeypatch.context() as m:
+            with (
+                fakefilefactory(
+                    fakepath, content="".join(mailparts)
+                ) as draft_f,
+                monkeypatch.context() as m,
+            ):
                 m.setattr(markdown.Markdown, "convert", lambda s, t: t)
                 m.setattr(markdown.Markdown, "convert", lambda s, t: t)
-                convert_markdown_to_html(
-                    "".join(mailparts),
-                    path,
-                    filewriter_fn=fake_filewriter,
-                    filereader_fn=filereader_fn,
-                )
+                convert_markdown_to_html(draft_f, filefactory=fakefilefactory)
 
 
-            soup = bs4.BeautifulSoup(fake_filewriter.pop()[1], "html.parser")
+            soup = bs4.BeautifulSoup(
+                fakefilefactory[fakepath.with_suffix(".html")].read(),
+                "html.parser",
+            )
             body = soup.body.contents
 
             assert mailparts[0] in body.pop(0)
             body = soup.body.contents
 
             assert mailparts[0] in body.pop(0)
@@ -1690,114 +1907,312 @@ try:
         @pytest.mark.converter
         @pytest.mark.sig
         def test_converter_signature_handling_htmlsig(
         @pytest.mark.converter
         @pytest.mark.sig
         def test_converter_signature_handling_htmlsig(
-            self, const1, fake_filewriter, monkeypatch
+            self, fakepath, fakepath2, fakefilefactory, monkeypatch
         ):
         ):
-            path = pathlib.Path(const1)
-
             mailparts = (
                 "This is the mail body",
                 f"{EMAIL_SIG_SEP}",
             mailparts = (
                 "This is the mail body",
                 f"{EMAIL_SIG_SEP}",
-                f"{HTML_SIG_MARKER}{path}\n",
+                f"{HTML_SIG_MARKER}{fakepath2}\n",
                 "This is the plain-text version",
             )
                 "This is the plain-text version",
             )
+            htmlsig = "HTML Signature from {path} but as a string"
+            html = (
+                f'<div id="signature"><p>{htmlsig.format(path=fakepath2)}</p></div>'
+            )
 
 
-            htmlsig = "HTML Signature from {path}"
-
-            def filereader_fn(path):
-                return f'<div id="signature">{htmlsig.format(path=path)}</div>'
+            sig_f = fakefilefactory(fakepath2, content=html)
 
             def mdwn_fn(t):
                 return t.upper()
 
 
             def mdwn_fn(t):
                 return t.upper()
 
-            with monkeypatch.context() as m:
+            with (
+                fakefilefactory(
+                    fakepath, content="".join(mailparts)
+                ) as draft_f,
+                monkeypatch.context() as m,
+            ):
                 m.setattr(
                     markdown.Markdown, "convert", lambda s, t: mdwn_fn(t)
                 )
                 m.setattr(
                     markdown.Markdown, "convert", lambda s, t: mdwn_fn(t)
                 )
-                convert_markdown_to_html(
-                    "".join(mailparts),
-                    path,
-                    filewriter_fn=fake_filewriter,
-                    filereader_fn=filereader_fn,
-                )
+                convert_markdown_to_html(draft_f, filefactory=fakefilefactory)
 
 
-            soup = bs4.BeautifulSoup(fake_filewriter.pop()[1], "html.parser")
+            soup = bs4.BeautifulSoup(
+                fakefilefactory[fakepath.with_suffix(".html")].read(),
+                "html.parser",
+            )
             sig = soup.select_one("#signature")
             sig.span.extract()
 
             assert HTML_SIG_MARKER not in sig.text
             sig = soup.select_one("#signature")
             sig.span.extract()
 
             assert HTML_SIG_MARKER not in sig.text
-            assert htmlsig.format(path=path) == sig.text.strip()
+            assert htmlsig.format(path=fakepath2) == sig.text.strip()
 
 
-            plaintext = fake_filewriter.pop()[1]
+            plaintext = fakefilefactory[fakepath].read()
             assert plaintext.endswith(EMAIL_SIG_SEP + mailparts[-1])
 
         @pytest.mark.converter
         @pytest.mark.sig
         def test_converter_signature_handling_htmlsig_with_image(
             assert plaintext.endswith(EMAIL_SIG_SEP + mailparts[-1])
 
         @pytest.mark.converter
         @pytest.mark.sig
         def test_converter_signature_handling_htmlsig_with_image(
-            self, const1, fake_filewriter, monkeypatch, test_png
+            self, fakepath, fakepath2, fakefilefactory, monkeypatch, test_png
         ):
         ):
-            path = pathlib.Path(const1)
-
             mailparts = (
                 "This is the mail body",
                 f"{EMAIL_SIG_SEP}",
             mailparts = (
                 "This is the mail body",
                 f"{EMAIL_SIG_SEP}",
-                f"{HTML_SIG_MARKER}{path}\n",
+                f"{HTML_SIG_MARKER}{fakepath2}\n",
                 "This is the plain-text version",
             )
                 "This is the plain-text version",
             )
-
             htmlsig = (
                 "HTML Signature from {path} with image\n"
                 f'<img src="{test_png}">\n'
             )
             htmlsig = (
                 "HTML Signature from {path} with image\n"
                 f'<img src="{test_png}">\n'
             )
+            html = (
+                f'<div id="signature">{htmlsig.format(path=fakepath2)}</div>'
+            )
 
 
-            def filereader_fn(path):
-                return f'<div id="signature">{htmlsig.format(path=path)}</div>'
+            sig_f = fakefilefactory(fakepath2, content=html)
 
             def mdwn_fn(t):
                 return t.upper()
 
 
             def mdwn_fn(t):
                 return t.upper()
 
-            with monkeypatch.context() as m:
+            with (
+                fakefilefactory(
+                    fakepath, content="".join(mailparts)
+                ) as draft_f,
+                monkeypatch.context() as m,
+            ):
                 m.setattr(
                     markdown.Markdown, "convert", lambda s, t: mdwn_fn(t)
                 )
                 m.setattr(
                     markdown.Markdown, "convert", lambda s, t: mdwn_fn(t)
                 )
-                convert_markdown_to_html(
-                    "".join(mailparts),
-                    path,
-                    filewriter_fn=fake_filewriter,
-                    filereader_fn=filereader_fn,
-                )
+                convert_markdown_to_html(draft_f, filefactory=fakefilefactory)
 
 
-            assert fake_filewriter.pop()[0].suffix == ".png"
+            assert fakefilefactory.pop()[0].suffix == ".png"
 
 
-            soup = bs4.BeautifulSoup(fake_filewriter.pop()[1], "html.parser")
+            soup = bs4.BeautifulSoup(
+                fakefilefactory[fakepath.with_suffix(".html")].read(),
+                "html.parser",
+            )
             assert soup.img.attrs["src"].startswith("cid:")
 
         @pytest.mark.converter
         @pytest.mark.sig
         def test_converter_signature_handling_textsig_with_image(
             assert soup.img.attrs["src"].startswith("cid:")
 
         @pytest.mark.converter
         @pytest.mark.sig
         def test_converter_signature_handling_textsig_with_image(
-            self, const1, fake_filewriter, test_png
+            self, fakepath, fakefilefactory, test_png
         ):
             mailparts = (
                 "This is the mail body",
                 f"{EMAIL_SIG_SEP}",
                 "This is the plain-text version with image\n",
                 f"![Inline]({test_png})",
         ):
             mailparts = (
                 "This is the mail body",
                 f"{EMAIL_SIG_SEP}",
                 "This is the plain-text version with image\n",
                 f"![Inline]({test_png})",
-
-            )
-            tree = convert_markdown_to_html
-                "".join(mailparts),
-                pathlib.Path(const1),
-                filewriter_fn=fake_filewriter,
             )
             )
+            with (
+                fakefilefactory(
+                    fakepath, content="".join(mailparts)
+                ) as draft_f,
+            ):
+                tree = convert_markdown_to_html(
+                    draft_f, filefactory=fakefilefactory
+                )
 
             assert tree.subtype == "relative"
             assert tree.children[0].subtype == "alternative"
             assert tree.children[1].subtype == "png"
 
             assert tree.subtype == "relative"
             assert tree.children[0].subtype == "alternative"
             assert tree.children[1].subtype == "png"
-            written = fake_filewriter.pop()
+            written = fakefilefactory.pop()
             assert tree.children[1].path == written[0]
             assert tree.children[1].path == written[0]
-            assert written[1] == request.urlopen(test_png).read()
+            assert written[1].read() == request.urlopen(test_png).read()
+
+        @pytest.mark.converter
+        def test_converter_attribution_to_admonition(
+            self, fakepath, fakefilefactory
+        ):
+            mailparts = (
+                "Regarding whatever",
+                "> blockquote line1",
+                "> blockquote line2",
+                "> ",
+                "> new para with **bold** text",
+            )
+            with fakefilefactory(
+                fakepath, content="\n".join(mailparts)
+            ) as draft_f:
+                convert_markdown_to_html(draft_f, filefactory=fakefilefactory)
+
+            soup = bs4.BeautifulSoup(
+                fakefilefactory[fakepath.with_suffix(".html")].read(),
+                "html.parser",
+            )
+            quote = soup.select_one("div.admonition.quote")
+            assert quote
+            assert (
+                soup.select_one("p.admonition-title").extract().text.strip()
+                == mailparts[0]
+            )
 
 
-        def test_converter_attribution_to_admonition(self, fake_filewriter):
+            p = quote.p.extract()
+            assert p.text.strip() == "\n".join(p[2:] for p in mailparts[1:3])
 
 
+            p = quote.p.extract()
+            assert p.contents[1].name == "strong"
+
+        @pytest.mark.converter
+        def test_converter_attribution_to_admonition_with_blockquote(
+            self, fakepath, fakefilefactory
+        ):
+            mailparts = (
+                "Regarding whatever",
+                "> blockquote line1",
+                "> blockquote line2",
+                "> ",
+                "> new para with **bold** text",
+            )
+            with fakefilefactory(
+                fakepath, content="\n".join(mailparts)
+            ) as draft_f:
+                convert_markdown_to_html(draft_f, filefactory=fakefilefactory)
+
+            soup = bs4.BeautifulSoup(
+                fakefilefactory[fakepath.with_suffix(".html")].read(),
+                "html.parser",
+            )
+            quote = soup.select_one("div.admonition.quote")
+            assert quote.blockquote
+
+        @pytest.mark.converter
+        def test_converter_attribution_to_admonition_multiple(
+            self, fakepath, fakefilefactory
+        ):
+            mailparts = (
+                "Regarding whatever",
+                "> blockquote line1",
+                "> blockquote line2",
+                "",
+                "Normal text",
+                "",
+                "> continued emailquote",
+                "",
+                "Another email-quote",
+                "> something",
+            )
+            with fakefilefactory(
+                fakepath, content="\n".join(mailparts)
+            ) as draft_f:
+                convert_markdown_to_html(draft_f, filefactory=fakefilefactory)
+
+            soup = bs4.BeautifulSoup(
+                fakefilefactory[fakepath.with_suffix(".html")].read(),
+                "html.parser",
+            )
+            quote = soup.select_one("div.admonition.quote.continued").extract()
+            assert quote
+            assert (
+                quote.select_one("p.admonition-title").extract().text.strip()
+                == mailparts[0]
+            )
+
+            p = quote.p.extract()
+            assert p
+
+            quote = soup.select_one("div.admonition.quote.continued").extract()
+            assert quote
+            assert (
+                quote.select_one("p.admonition-title").extract().text.strip()
+                == mailparts[-2]
+            )
+
+        @pytest.mark.fileio
+        def test_file_class_contextmanager(self, const1, monkeypatch):
+            state = dict(o=False, c=False)
+
+            def fn(t):
+                state[t] = True
+
+            with monkeypatch.context() as m:
+                m.setattr(File, "open", lambda s: fn("o"))
+                m.setattr(File, "close", lambda s: fn("c"))
+                with File() as f:
+                    assert state["o"]
+                    assert not state["c"]
+            assert state["c"]
+
+        @pytest.mark.fileio
+        def test_file_class_no_path(self, const1):
+            with File(mode="w+") as f:
+                f.write(const1, cache=False)
+                assert f.read(cache=False) == const1
+
+        @pytest.mark.fileio
+        def test_file_class_path(self, const1, tmp_path):
+            with File(tmp_path / "file", mode="w+") as f:
+                f.write(const1, cache=False)
+                assert f.read(cache=False) == const1
+
+        @pytest.mark.fileio
+        def test_file_class_path_no_exists(self, fakepath):
+            with pytest.raises(FileNotFoundError):
+                File(fakepath, mode="r").open()
+
+        @pytest.mark.fileio
+        def test_file_class_cache(self, tmp_path, const1, const2):
+            path = tmp_path / "file"
+            file = File(path, mode="w+")
+            with file as f:
+                f.write(const1, cache=True)
+            with open(path, mode="w") as f:
+                f.write(const2)
+            with file as f:
+                assert f.read(cache=True) == const1
+
+        @pytest.mark.fileio
+        def test_file_class_cache_init(self, const1):
+            file = File(path=None, mode="r", content=const1)
+            with file as f:
+                assert f.read() == const1
+
+        @pytest.mark.fileio
+        def test_file_class_content_or_path(self, fakepath, const1):
+            with pytest.raises(RuntimeError):
+                file = File(path=fakepath, content=const1)
+
+        @pytest.mark.fileio
+        def test_file_class_content_needs_read(self, const1):
+            with pytest.raises(RuntimeError):
+                file = File(mode="w", content=const1)
+
+        @pytest.mark.fileio
+        def test_file_class_write_persists_close(self, const1):
+            f = File(mode="w+")
+            with f:
+                f.write(const1)
+            with f:
+                assert f.read() == const1
+
+        @pytest.mark.fileio
+        def test_file_class_write_resets_read_cache(self, const1, const2):
+            with File(mode="w+", content=const1) as f:
+                assert f.read() == const1
+                f.write(const2)
+                assert f.read() == const2
+
+        @pytest.mark.fileio
+        def test_file_factory(self):
+            fact = FileFactory()
+            f = fact()
+            assert isinstance(f, File)
+            assert len(fact) == 1
+            assert f in fact
+            assert f == fact[0]
+
+        @pytest.mark.fileio
+        def test_fake_file_factory(self, fakepath, fakefilefactory):
+            fact = FakeFileFactory()
+            f = fakefilefactory(fakepath)
+            assert f.path == fakepath
+            assert f == fakefilefactory[fakepath]
+
+        @pytest.mark.fileio
+        def test_fake_file_factory_path_persistence(
+            self, fakepath, fakefilefactory
+        ):
+            f1 = fakefilefactory(fakepath)
+            assert f1 == fakefilefactory(fakepath)
 
 except ImportError:
     pass
 
 except ImportError:
     pass