Quoth Damien Cassou on Nov 18 at  8:18 pm:
> Signed-off-by: Damien Cassou <damien.cas...@gmail.com>
> ---
>  emacs/notmuch-show.el   |   24 +++++++++++++++++++++---
>  emacs/notmuch-tagger.el |   44 ++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 65 insertions(+), 3 deletions(-)
>  create mode 100644 emacs/notmuch-tagger.el
> 
> diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
> index 5b3e70e..988e27c 100644
> --- a/emacs/notmuch-show.el
> +++ b/emacs/notmuch-show.el
> @@ -36,6 +36,7 @@
>  (require 'notmuch-mua)
>  (require 'notmuch-crypto)
>  (require 'notmuch-print)
> +(require 'notmuch-tagger)
>  
>  (declare-function notmuch-call-notmuch-process "notmuch" (&rest args))
>  (declare-function notmuch-fontify-headers "notmuch" nil)
> @@ -1121,11 +1122,28 @@ function is used."
>  
>        (jit-lock-register #'notmuch-show-buttonise-links)
>  
> -      ;; Set the header line to the subject of the first message.
> -      (setq header-line-format (notmuch-show-strip-re 
> (notmuch-show-get-subject)))
> -
> +      (notmuch-show-update-header-line)
>        (run-hooks 'notmuch-show-hook))))
>  
> +(defun notmuch-show-thread-tags ()
> +  "Return the list of tags for the current thread."
> +  (let ((tags (list)))
> +    (notmuch-show-mapc (lambda ()
> +                      (mapcar (lambda (elt)
> +                                ;; Avoid adding duplicate tags
> +                                (add-to-list 'tags elt))
> +                              (notmuch-show-get-tags))))
> +    tags))
> +
> +(defun notmuch-show-update-header-line ()
> +  "Make the header-line show the thread's subject and tags."
> +  (let ((thread-subject (notmuch-show-strip-re (notmuch-show-get-subject))))
> +    (setq header-line-format
> +       (list
> +        thread-subject
> +        " "
> +        (notmuch-tagger-present-tags-header-line 
> (notmuch-show-thread-tags))))))
> +
>  (defun notmuch-show-capture-state ()
>    "Capture the state of the current buffer.
>  
> diff --git a/emacs/notmuch-tagger.el b/emacs/notmuch-tagger.el
> new file mode 100644
> index 0000000..5ca190e
> --- /dev/null
> +++ b/emacs/notmuch-tagger.el
> @@ -0,0 +1,44 @@
> +;; notmuch-tagger.el --- Library to improve the way tags are displayed
> +;;
> +;; Copyright © Damien Cassou
> +;;
> +;; This file is part of Notmuch.
> +;;
> +;; Notmuch is free software: you can redistribute it and/or modify it
> +;; under the terms of the GNU General Public License as published by
> +;; the Free Software Foundation, either version 3 of the License, or
> +;; (at your option) any later version.
> +;;
> +;; Notmuch is distributed in the hope that it will be useful, but
> +;; WITHOUT ANY WARRANTY; without even the implied warranty of
> +;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +;; General Public License for more details.
> +;;
> +;; You should have received a copy of the GNU General Public License
> +;; along with Notmuch.  If not, see <http://www.gnu.org/licenses/>.
> +;;
> +;; Authors: Damien Cassou <damien.cas...@gmail.com>
> +;;; Commentary:
> +;;
> +;;; Code:
> +;;
> +(defun notmuch-tagger-separate-elems (list sep)

notmuch-tagger-intersperse?

This could also reasonably go in notmuch-lib.el as a general utility.

(How do neither Elisp nor 'cl have an intersperse?)

> +  "Return a list with all elements of LIST separated by SEP."
> +  (let ((first t)
> +        (res nil))
> +    (dolist (elt (reverse list) res)

(dolist (elt list (nreverse res)) ...) to save a list copy?

> +      (unless first
> +        (push sep res))
> +      (setq first nil)
> +      (push elt res))))
> +
> +(defun notmuch-tagger-present-tags-header-line (tags)
> +  "Return a property list to present TAGS in emacs header-line."
> +  (list
> +   "("
> +   (notmuch-tagger-separate-elems tags " ")
> +   ")"))
> +
> +
> +(provide 'notmuch-tagger)
> +;;; notmuch-tagger.el ends here
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