add multiples to

layercake/layercake/email_.py

@@ -1,29 +1,41 @@
 from email.mime.application import MIMEApplication
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
-from email.utils import formataddr
+from email.utils import formataddr as formataddr_
 from pathlib import Path
 
+type Email = str
+type NamedEmail = tuple[str, Email]
+type Address = Email | list[Email] | NamedEmail | list[NamedEmail]
+
 
 class Message:
     def __init__(
         self,
-        from_: tuple[str | None, str],
-        to: tuple[str | None, str],
+        from_: NamedEmail,
+        to: Address,
         subject: str,
-        reply_to: tuple[str | None, str] | None = None,
+        cc: Address | None = None,
+        bcc: Address | None = None,
+        reply_to: NamedEmail | None = None,
         content: str | None = None,
     ) -> None:
         self._references = set()
         self._body = MIMEMultipart('alternative')
         self._message = MIMEMultipart('mixed')
-        self._message['From'] = formataddr(from_)
+        self._message['From'] = formataddr_(from_)
         self._message['To'] = formataddr(to)
         self._message['Subject'] = subject
         self._message.attach(self._body)
 
         if reply_to:
-            self._message['Reply-To'] = formataddr(reply_to)
+            self._message['Reply-To'] = formataddr_(reply_to)
+
+        if cc:
+            self._message['Cc'] = formataddr(cc)
+
+        if bcc:
+            self._message['Bcc'] = formataddr(bcc)
 
         if content:
             self.add_alternative(content, subtype='plain')
@@ -62,3 +74,13 @@ class Message:
             self._message['References'] = ' '.join(self._references)
 
         return self._message.as_bytes()
+
+
+def formataddr(address: Address) -> str:
+    if isinstance(address, str):
+        return formataddr_((None, address))
+
+    if isinstance(address, tuple):
+        return formataddr_(address)
+
+    return ', '.join([formataddr(addr) for addr in address])