buildmimetree.py: support modifying the original markdown source

diff --git a/.config/neomutt/buildmimetree.py b/.config/neomutt/buildmimetree.py
index ad4e988cb7eaef570d8fe29ec668e6cce2a33481..2dac39c4b34bef85072efccd144c0c781daa1c51 100755 (executable)
--- a/.config/neomutt/buildmimetree.py
+++ b/.config/neomutt/buildmimetree.py
@@ -142,23 +142,25 @@ class Multipart(
 
 def convert_markdown_to_html(maildraft, *, extensions=None):
     draftpath = pathlib.Path(maildraft)
-    textpart = Part(
-        "text", "plain", draftpath, "Plain-text version", orig=True
-    )
-
     with open(draftpath, "r", encoding="utf-8") as textmarkdown:
         text = textmarkdown.read()
 
     mdwn = markdown.Markdown(extensions=extensions)
-    html = mdwn.convert(text)
 
-    htmlpath = draftpath.with_suffix(".html")
-    htmlpart = Part("text", "html", htmlpath, "HTML version")
 
+    with open(draftpath, "w", encoding="utf-8") as textplain:
+        textplain.write(text)
+    textpart = Part(
+        "text", "plain", draftpath, "Plain-text version", orig=True
+    )
+
+    html = mdwn.convert(text)
+    htmlpath = draftpath.with_suffix(".html")
     with open(
         htmlpath, "w", encoding="utf-8", errors="xmlcharrefreplace"
     ) as texthtml:
         texthtml.write(html)
+    htmlpart = Part("text", "html", htmlpath, "HTML version")
 
     logopart = Part(
         "image",
@@ -351,17 +353,23 @@ def do_massage(
             # We've hit a leaf-node, i.e. an alternative or a related part
             # with actual content.
 
-            # If the part is not an original part, i.e. doesn't already
-            # exist, we must first add it.
-            if not item.orig:
+            # Let's add the part
+            if item.orig:
+                # The original source already exists in the NeoMutt tree, but
+                # the underlying file may have been modified, so we need to
+                # update the encoding, but that's it:
+                cmds.push("<update-encoding>")
+            else:
+                # … whereas all other parts need to be added, and they're all
+                # considered to be temporary and inline:
                 cmds.push(f"<attach-file>{item.path}<enter>")
                 cmds.push("<toggle-unlink><toggle-disposition>")
-                if item.cid:
-                    cmds.push(f"<edit-content-id>\\Ca\\Ck{item.cid}<enter>")
 
-            # If the item (including the original) comes with a
-            # description, then we might just as well update the NeoMutt
+            # If the item (including the original) comes with additional
+            # information, then we might just as well update the NeoMutt
             # tree now:
+            if item.cid:
+                cmds.push(f"<edit-content-id>\\Ca\\Ck{item.cid}<enter>")
             if item.desc:
                 cmds.push(f"<edit-description>\\Ca\\Ck{item.desc}<enter>")