feat: add assume_markdown config flag (#31)

README.md

@@ -46,6 +46,7 @@ Muttdown's configuration file is written using [YAML][]. Example:
     smtp_username: foo@bar.com
     smtp_password: foo
     css_file: ~/.muttdown.css
+    assume_markdown: false
 
 
 If you prefer not to put your password in plaintext in a configuration file, you can instead specify the `smtp_password_command` parameter to invoke a shell command to lookup your password. The command should output your password, followed by a newline, and no other text. On OS X, the following invocation will extract a generic "Password" entry with the application set to "mutt" and the title set to "foo@bar.com":
@@ -58,6 +59,8 @@ The `css_file` should be regular CSS styling blocks; we use [pynliner][] to inli
 
 Muttdown can also send its mail using the native `sendmail` if you have that set up (instead of doing SMTP itself). To do so, just leave the smtp options in the config file blank, set the `sendmail` option to the fully-qualified path to your `sendmail` binary, and run muttdown with the `-s` flag
 
+If `assume_markdown` is true, then all input is assumed to be Markdown by default and the `!m` sigil does nothing.
+
 Installation
 ------------
 Install muttdown with `pip install muttdown` or by downloading this package and running `python setup.py install`. You will need the [PyYAML][] and [Python-Markdown][] libraries, as specified in `requirements.txt`. This should work with Python 3.6+.

man/muttdown.1

@@ -83,6 +83,8 @@ smtp_username: foo@bar.com
 smtp_password: foo
 .br
 css_file: ~/.muttdown.css
+.br
+assume_markdown: false
 .P
 If you prefer not to put your password in plaintext in a configuration file, you
 can instead specify the \fBsmtp_password_command\fR parameter to invoke a shell
@@ -106,6 +108,9 @@ have that set up (instead of doing SMTP itself). To do so, just leave the smtp
 options in the config file blank, set the \fBsendmail\fR option to the
 fully-qualified path to your \fBsendmail\fR binary, and run \fBmuttdown\fR with
 the \fB-s\fR flag
+.P
+If \fBassume_markdown\fR is true, then all input is assumed to be Markdown by
+default and the \fB!m\fR sigil does nothing.
 
 .SH AUTHORS
 \fBmuttdown\fR was written by James Brown <Roguelazer@gmail.com>.

muttdown/main.py

@@ -42,9 +42,10 @@ def convert_one(part, config, charset):
             except UnicodeError:
                 # this is because of message.py:278 and seems like a hack
                 text = text.decode("raw-unicode-escape")
-    if not text.startswith("!m"):
-        return None
-    text = re.sub(r"\s*!m\s*", "", text, re.M)
+    if not config.assume_markdown:
+        if not text.startswith("!m"):
+            return None
+        text = re.sub(r"\s*!m\s*", "", text, re.M)
     if "\n-- \n" in text:
         pre_signature, signature = text.split("\n-- \n")
         md = markdown.markdown(

tests/test_basic.py

@@ -310,3 +310,18 @@ def test_raw_unicode(basic_config):
     converted = process_message(mail, basic_config)
     assert converted["From"] == "Test <test@example.com>"
     assert "Ø" in converted.get_payload()
+
+
+def test_assume_markdown(basic_config):
+    msg = Message()
+    msg["Subject"] = "Test Message"
+    msg["From"] = "from@example.com"
+    msg["To"] = "to@example.com"
+    msg["Bcc"] = "bananas"
+    msg.set_payload("This message has no **sigil**")
+
+    basic_config.merge_config({"assume_markdown": True})
+
+    converted = process_message(msg, basic_config)
+    html_part = converted.get_payload()[1].get_payload(decode=True)
+    assert html_part == b"<p>This message has no <strong>sigil</strong></p>"