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buildmimetree.py: list only becomes mp/mixed if len>1
[etc/neomutt.git] / .config / neomutt / buildmimetree.py
index 0b62aa4f25b14dda3316db4c4a58c3dcf6794fdb..779f60b9f449edc56efb473c90b058768efa4bad 100755 (executable)
@@ -8,7 +8,7 @@
 #   neomuttrc (needs to be a single line):
 #     set my_mdwn_extensions="extra,admonition,codehilite,sane_lists,smarty"
 #     macro compose B "\
-#       <enter-command> source '$my_confdir/buildmimetree.py setup \
+#       <enter-command> source '$my_confdir/buildmimetree.py \
 #       --tempdir $tempdir --extensions $my_mdwn_extensions|'<enter>\
 #       <enter-command> sourc e \$my_mdwn_postprocess_cmd_file<enter>\
 #     " "Convert message into a modern MIME tree with inline images"
@@ -23,8 +23,8 @@
 #   - python3-markdown
 # Optional:
 #   - pytest
-#   - Pynliner
-#   - Pygments, if installed, then syntax highlighting is enabled
+#   - Pynliner, provides --css-file and thus inline styling of HTML output
+#   - Pygments, then syntax highlighting for fenced code is enabled
 #
 # Latest version:
 #   https://git.madduck.net/etc/neomutt.git/blob_plain/HEAD:/.config/neomutt/buildmimetree.py
@@ -55,79 +55,66 @@ def parse_cli_args(*args, **kwargs):
         )
     )
     parser.epilog = (
-        "Copyright © 2022 martin f. krafft <madduck@madduck.net>.\n"
+        "Copyright © 2023 martin f. krafft <madduck@madduck.net>.\n"
         "Released under the MIT licence"
     )
 
-    subp = parser.add_subparsers(help="Sub-command parsers", dest="mode")
-    parser_setup = subp.add_parser("setup", help="Setup phase")
-    parser_massage = subp.add_parser("massage", help="Massaging phase")
-
-    parser_setup.add_argument(
+    parser.add_argument(
         "--extensions",
         type=str,
         default="",
-        help="Markdown extension to use (comma-separated list)"
+        help="Markdown extension to use (comma-separated list)",
     )
 
-    parser_setup.add_argument(
+    if _PYNLINER:
+        parser.add_argument(
+            "--css-file",
+            type=str,
+            default="",
+            help="CSS file to merge with the final HTML",
+        )
+    else:
+        parser.set_defaults(css_file=None)
+
+    parser.add_argument(
         "--only-build",
         action="store_true",
         help="Only build, don't send the message",
     )
 
-    parser_setup.add_argument(
+    parser.add_argument(
         "--tempdir",
         default=None,
         help="Specify temporary directory to use for attachments",
     )
 
-    parser_setup.add_argument(
+    parser.add_argument(
         "--debug-commands",
         action="store_true",
         help="Turn on debug logging of commands generated to stderr",
     )
 
-    parser_massage.add_argument(
+    subp = parser.add_subparsers(help="Sub-command parsers", dest="mode")
+    massage_p = subp.add_parser(
+        "massage", help="Massaging phase (internal use)"
+    )
+
+    massage_p.add_argument(
         "--write-commands-to",
+        "-o",
         metavar="PATH",
         dest="cmdpath",
+        required=True,
         help="Temporary file path to write commands to",
     )
 
-    parser_massage.add_argument(
-        "--extensions",
-        metavar="EXTENSIONS",
-        type=str,
-        default="",
-        help="Markdown extension to use (comma-separated list)",
-    )
-
-    parser_massage.add_argument(
-        "--only-build",
-        action="store_true",
-        help="Only build, don't send the message",
-    )
-
-    parser_massage.add_argument(
-        "--tempdir",
-        default=None,
-        help="Specify temporary directory to use for attachments",
-    )
-
-    parser_massage.add_argument(
-        "--debug-commands",
-        action="store_true",
-        help="Turn on debug logging of commands generated to stderr",
-    )
-
-    parser_massage.add_argument(
+    massage_p.add_argument(
         "--debug-walk",
         action="store_true",
         help="Turn on debugging to stderr of the MIME tree walk",
     )
 
-    parser_massage.add_argument(
+    massage_p.add_argument(
         "MAILDRAFT",
         nargs="?",
         help="If provided, the script is invoked as editor on the mail draft",
@@ -185,11 +172,15 @@ class InlineImageExtension(Extension):
         return self._images
 
 
-def markdown_with_inline_image_support(text, *, extensions=None):
+def markdown_with_inline_image_support(
+    text, *, extensions=None, extension_configs=None
+):
     inline_image_handler = InlineImageExtension()
     extensions = extensions or []
     extensions.append(inline_image_handler)
-    mdwn = markdown.Markdown(extensions=extensions)
+    mdwn = markdown.Markdown(
+        extensions=extensions, extension_configs=extension_configs
+    )
     htmltext = mdwn.convert(text)
 
     images = inline_image_handler.get_images()
@@ -204,6 +195,38 @@ def markdown_with_inline_image_support(text, *, extensions=None):
     return text, htmltext, images
 
 
+# [ CSS STYLING ] #############################################################
+
+try:
+    import pynliner
+
+    _PYNLINER = True
+
+except ImportError:
+    _PYNLINER = False
+
+try:
+    from pygments.formatters import get_formatter_by_name
+
+    _CODEHILITE_CLASS = "codehilite"
+
+    _PYGMENTS_CSS = get_formatter_by_name(
+        "html", style="default"
+    ).get_style_defs(f".{_CODEHILITE_CLASS}")
+
+except ImportError:
+    _PYGMENTS_CSS = None
+
+
+def apply_styling(html, css):
+    return (
+        pynliner.Pynliner()
+        .from_string(html)
+        .with_cssString("\n".join(s for s in [_PYGMENTS_CSS, css] if s))
+        .run()
+    )
+
+
 # [ PARTS GENERATION ] ########################################################
 
 
@@ -229,6 +252,9 @@ class Multipart(
     def __str__(self):
         return f"<multipart/{self.subtype}> children={len(self.children)}"
 
+    def __hash__(self):
+        return hash(str(self.subtype) + "".join(str(self.children)))
+
 
 def filewriter_fn(path, content, mode="w", **kwargs):
     with open(path, mode, **kwargs) as out_f:
@@ -240,6 +266,9 @@ def collect_inline_images(
 ):
     relparts = []
     for path, info in images.items():
+        if path.startswith("cid:"):
+            continue
+
         data = request.urlopen(path)
 
         mimetype = data.headers["Content-Type"]
@@ -250,7 +279,12 @@ def collect_inline_images(
         filewriter_fn(path, data.read(), "w+b")
 
         relparts.append(
-            Part(*mimetype.split("/"), path, cid=info.cid, desc=f"Image: {info.desc}")
+            Part(
+                *mimetype.split("/"),
+                path,
+                cid=info.cid,
+                desc=f"Image: {info.desc}",
+            )
         )
 
     return relparts
@@ -260,12 +294,19 @@ def convert_markdown_to_html(
     origtext,
     draftpath,
     *,
+    cssfile=None,
     filewriter_fn=filewriter_fn,
     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
+
     origtext, htmltext, images = markdown_with_inline_image_support(
-        origtext, extensions=extensions
+        origtext, extensions=extensions, extension_configs=extension_configs
     )
 
     filewriter_fn(draftpath, origtext, encoding="utf-8")
@@ -273,6 +314,8 @@ def convert_markdown_to_html(
         "text", "plain", draftpath, "Plain-text version", orig=True
     )
 
+    htmltext = apply_styling(htmltext, cssfile)
+
     htmlpath = draftpath.with_suffix(".html")
     filewriter_fn(
         htmlpath, htmltext, encoding="utf-8", errors="xmlcharrefreplace"
@@ -296,17 +339,22 @@ def convert_markdown_to_html(
 
 class MIMETreeDFWalker:
     def __init__(self, *, visitor_fn=None, debug=False):
-        self._visitor_fn = visitor_fn
+        self._visitor_fn = visitor_fn or self._echovisit
         self._debug = debug
 
+    def _echovisit(self, node, ancestry, debugprint):
+        debugprint(f"node={node} ancestry={ancestry}")
+
     def walk(self, root, *, visitor_fn=None):
         """
         Recursive function to implement a depth-dirst walk of the MIME-tree
         rooted at `root`.
         """
-
         if isinstance(root, list):
-            root = Multipart("mixed", children=root)
+            if len(root) > 1:
+                root = Multipart("mixed", children=root)
+            else:
+                root = root[0]
 
         self._walk(
             root,
@@ -400,10 +448,8 @@ class MuttCommands:
 
 
 def do_setup(
-    extensions=None,
     *,
     out_f=sys.stdout,
-    only_build=False,
     temppath=None,
     tempdir=None,
     debug_commands=False,
@@ -413,15 +459,7 @@ def do_setup(
     )
     cmds = MuttCommands(out_f, debug=debug_commands)
 
-    editor = f"{sys.argv[0]} massage --write-commands-to {temppath}"
-    if extensions:
-        editor = f'{editor} --extensions {extensions}'
-    if only_build:
-        editor = f'{editor} --only-build'
-    if tempdir:
-        editor = f"{editor} --tempdir {tempdir}"
-    if debug_commands:
-        editor = f"{editor} --debug-commands"
+    editor = f"{' '.join(sys.argv)} massage --write-commands-to {temppath}"
 
     cmds.cmd('set my_editor="$editor"')
     cmds.cmd('set my_edit_headers="$edit_headers"')
@@ -438,6 +476,7 @@ def do_massage(
     cmd_f,
     *,
     extensions=None,
+    cssfile=None,
     converter=convert_markdown_to_html,
     only_build=False,
     tempdir=None,
@@ -463,7 +502,13 @@ def do_massage(
     cmds.flush()
 
     extensions = extensions.split(",") if extensions else []
-    tree = converter(draft_f.read(), draftpath, tempdir=tempdir, extensions=extensions)
+    tree = converter(
+        draft_f.read(),
+        draftpath,
+        cssfile=cssfile,
+        tempdir=tempdir,
+        extensions=extensions,
+    )
 
     mimetree = MIMETreeDFWalker(debug=debug_walk)
 
@@ -473,7 +518,7 @@ def do_massage(
         depth-first, and responsible for telling NeoMutt how to assemble
         the tree.
         """
-        KILL_LINE=r'\Ca\Ck'
+        KILL_LINE = r"\Ca\Ck"
 
         if isinstance(item, Part):
             # We've hit a leaf-node, i.e. an alternative or a related part
@@ -549,10 +594,8 @@ def do_massage(
 if __name__ == "__main__":
     args = parse_cli_args()
 
-    if args.mode == "setup":
+    if args.mode is None:
         do_setup(
-            args.extensions,
-            only_build=args.only_build,
             tempdir=args.tempdir,
             debug_commands=args.debug_commands,
         )
@@ -566,6 +609,7 @@ if __name__ == "__main__":
                 pathlib.Path(args.MAILDRAFT),
                 cmd_f,
                 extensions=args.extensions,
+                cssfile=args.css_file,
                 only_build=args.only_build,
                 tempdir=args.tempdir,
                 debug_commands=args.debug_commands,
@@ -681,14 +725,17 @@ try:
             assert items[4][0].subtype == "relative"
             assert items[4][1] == 0
 
-        def test_MIMETreeDFWalker_list_to_mixed(self, basic_mime_tree):
+        def test_MIMETreeDFWalker_list_to_mixed(self, const1):
             mimetree = MIMETreeDFWalker()
             items = []
 
             def visitor_fn(item, stack, debugprint):
                 items.append(item)
 
-            mimetree.walk([basic_mime_tree], visitor_fn=visitor_fn)
+            p = Part("text", "plain", const1)
+            mimetree.walk([p], visitor_fn=visitor_fn)
+            assert items[-1].subtype == "plain"
+            mimetree.walk([p, p], visitor_fn=visitor_fn)
             assert items[-1].subtype == "mixed"
 
         def test_MIMETreeDFWalker_visitor_in_constructor(
@@ -703,33 +750,12 @@ try:
             mimetree.walk(basic_mime_tree)
             assert len(items) == 5
 
-        def test_do_setup_no_extensions(self, const1, capsys):
-            "Assert basics about the setup command output"
-            do_setup(temppath=const1, out_f=sys.stdout)
-            captout = capsys.readouterr()
-            lines = captout.out.splitlines()
-            assert lines[2].endswith(f'{const1}"')
-            assert lines[4].endswith(const1)
-            assert "first-entry" in lines[-1]
-            assert "edit-file" in lines[-1]
-
-        def test_do_setup_extensions(self, const1, const2, capsys):
-            "Assert that extensions are passed to editor"
-            do_setup(
-                temppath=const1, extensions=[const2, const1], out_f=sys.stdout
-            )
-            captout = capsys.readouterr()
-            lines = captout.out.splitlines()
-            # assert comma-separated list of extensions passed
-            assert lines[2].endswith(f'{const2},{const1}"')
-            assert lines[4].endswith(const1)
-
         @pytest.fixture
         def string_io(self, const1, text=None):
             return StringIO(text or const1)
 
         def test_do_massage_basic(self, const1, string_io, capsys):
-            def converter(drafttext, draftpath, extensions, tempdir):
+            def converter(drafttext, draftpath, cssfile, extensions, tempdir):
                 return Part("text", "plain", draftpath, orig=True)
 
             do_massage(
@@ -753,7 +779,7 @@ try:
         def test_do_massage_fulltree(
             self, string_io, const1, basic_mime_tree, capsys
         ):
-            def converter(drafttext, draftpath, extensions, tempdir):
+            def converter(drafttext, draftpath, cssfile, extensions, tempdir):
                 return basic_mime_tree
 
             do_massage(
@@ -933,6 +959,23 @@ try:
             assert tree.children[1].path == written[0]
             assert written[1] == request.urlopen(test_png).read()
 
+        def test_converter_tree_inline_image_cid(
+            self, const1, fake_filewriter
+        ):
+            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,
+            )
+            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"
+
         def test_inline_image_collection(
             self, test_png, const1, const2, fake_filewriter
         ):
@@ -949,5 +992,22 @@ try:
             assert relparts[0].cid == const1
             assert relparts[0].desc.endswith(const2)
 
+        def test_apply_stylesheet(self):
+            if _PYNLINER:
+                html = "<p>Hello, world!</p>"
+                css = "p { color:red }"
+                out = apply_styling(html, css)
+                assert 'p style="color' in out
+
+        def test_apply_stylesheet_pygments(self):
+            if _PYGMENTS_CSS:
+                html = (
+                    f'<div class="{_CODEHILITE_CLASS}">'
+                    "<pre>def foo():\n    return</pre></div>"
+                )
+                out = apply_styling(html, _PYGMENTS_CSS)
+                assert f'{_CODEHILITE_CLASS}" style="' in out
+
+
 except ImportError:
     pass