emacs: Add more functions to clean up text/plain parts

Add:
- notmuch-wash-wrap-long-lines: Wrap lines longer than the width of
  the current window whilst maintaining any citation prefix.
- notmuch-wash-tidy-citations: Tidy up citations by:
  - compress repeated otherwise blank citation lines,
  - remove otherwise blank citation lines at the head and tail of a
    citation and remove blank lines between attribution statements and
    the citation,
- notmuch-wash-compress-blanks: Compress repeated blank lines and
  remove leading and trailing blank lines.

Enable `notmuch-wash-tidy-citations' and
`notmuch-wash-compress-blanks' by default by adding them to
`notmuch-show-insert-text/plain-hook'. `notmuch-wash-wrap-long-lines'
is not enabled by default.

If `notmuch-wash-wrap-long-lines' is enabled, word wrapping of the
buffer leads to an unappealing display of text, so provide a function
to disable it and add it to the list of `notmuch-show-mode' hook
functions.

1 files changed, 22 insertions, 5 deletions

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index f958a306..aa8041c2 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -62,17 +62,34 @@ any given message."
   "A list of functions called to decorate the headers listed in
 `notmuch-message-headers'.")
 
-(defvar notmuch-show-hook '(notmuch-show-pretty-hook)
+(defcustom notmuch-show-hook '(notmuch-show-pretty-hook)
   "A list of functions called after populating a
-`notmuch-show' buffer.")
-
-(defvar notmuch-show-insert-text/plain-hook '(notmuch-wash-text/plain-citations)
-  "A list of functions called to clean up text/plain body parts.")
+`notmuch-show' buffer."
+  :group 'notmuch
+  :type 'hook
+  :options '(notmuch-show-pretty-hook
+	     notmuch-show-turn-off-word-wrap))
+
+(defcustom notmuch-show-insert-text/plain-hook
+  '(notmuch-wash-tidy-citations
+    notmuch-wash-compress-blanks
+    notmuch-wash-markup-citations)
+  "A list of functions called to clean up text/plain body parts."
+  :group 'notmuch
+  :type 'hook
+  :options '(notmuch-wash-wrap-long-lines
+	     notmuch-wash-tidy-citations
+	     notmuch-wash-compress-blanks
+	     notmuch-wash-markup-citations))
 
 (defun notmuch-show-pretty-hook ()
   (goto-address-mode 1)
   (visual-line-mode))
 
+(defun notmuch-show-turn-off-word-wrap ()
+  ;; `toggle-word-wrap' outputs a message, which is distracting.
+  (setq word-wrap nil))
+
 (defmacro with-current-notmuch-show-message (&rest body)
   "Evaluate body with current buffer set to the text of current message"
   `(save-excursion