Decode UTF7 directory names about mu HOT 5 CLOSED

Ouch, what a piece of ugly in the IMAP-standard :-/ I guess we need some utf7->utf8 conversion routines when writing the maildir names in the database. (and maybe some reverse routine for 'mu mkdir').

Interestingly, no one ever mentioned this issue since 2008!

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Its also a modified version of utf7. hehe
http://tools.ietf.org/html/rfc3501#section-5.1.3

I'm currently using the following with offlineimap to do the conversion to utf8 at that level:
https://github.com/dpwright/dotfiles/blob/70bb3ccee5ea6147b25b2b9bae9ca93df5059601/.offlineimap.utf7.py

Then include it in the offineimaprc file and add this to the repo:
nametrans = lambda foldername: foldername.decode('imap4-utf-7').encode('utf-8')

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I fat fingered the close thing. oops!

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Okay, I've added a link to Dankles workaround to the FAQ; it's probably best to solve the problem at the folder-level rather then having mu/mu4e guess those names.

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For what it worth, users can easily workaround this from mu4e side : use a func to convert imap list to utf8 list on the one side and, on the other side, set up a mu4e completion read func to leverage this. (sorry for the awful below lisp code , but you'll get the point)

(require 'utf7)

(defun pyl/utf7-to-utf8-str-list (utf7-list)
(let* ((iter utf7-list)
(decoded)
(result))
(while (not (eq nil iter))
(setq
decoded (cons (utf7-decode (car iter) t) decoded)
iter (cdr iter)))
(setq result decoded)))

(defun pyl-helm-mu-compl-read (prompt maildirs-list &optional ignore1 ignore2 ignore3)
(let ((utf8-dirs (pyl/utf7-to-utf8-str-list maildirs-list)))
(utf7-encode (helm-comp-read prompt utf8-dirs
:name prompt
:must-match t))))

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