[bug-mailutils] Should (mu-mailbox-open "file:///FOO" "r") work on a random mh dir?

[Rob Browning]

If I have a random directory, say /bar/foo containing numbered message
files, should

  (mu-mailbox-open "file:///bar/foo" "r")

open that directory as a mailbox?

If so, it's not working here with a locally built version of the
Debian 1:0.6.94-1 package, and so I wondered if there might be a bug,
or if there might be something wrong with the directory.

I tried 

  /usr/bin/mu-mh/scan --folder=/bar/foo

and that worked fine, but (mu-mailbox-open "file:///bar/foo" "r")
failed with

  ERROR: In procedure mu-mailbox-open:
  ERROR: Cannot create default mailbox file://bar/foo

I ran an strace -f to see if I could figure out what mailutils was
looking for, but that didn't reveal much.  The only mention of foo was

  ...
  26584 stat64("///bar/foo", {st_mode=S_IFDIR|0750, st_size=4096, ...}) = 0
  26584 write(2, "ERROR", 5)              = 5
  ...


Also, as a wishlist item, it would be nice if there were a way to
directly create a message from Scheme, i.e. perhaps something like
this

  (mu-message-from-file filename)
  (mu-message-from-port port)

for cases where you just want to examine the contents of a message.

Thanks

-- 
Rob Browning
rlb @defaultvalue.org and @debian.org; previously @cs.utexas.edu
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