[O] Abbreviating filtered tags in mode line

[Thomas Morgan]

Dear Org-mode hackers,

This patch defines a variable org-agenda-abbreviate-tag-filter;
when it is set, filtered tags indicated on the mode line are
abbreviated according to their fast selection letters.

For example, "address@hidden@net" is abbreviated "-h.+n." if the fast
selection letters of @home and @net are h and n respectively.

Best,
Thomas

>From 3c12d4b5c6ad12d6f34fe34ecc94f7be54fe61b5 Mon Sep 17 00:00:00 2001
From: Thomas Morgan <address@hidden>
Date: Wed, 14 May 2014 01:54:17 -0400
Subject: [PATCH] Optionally abbreviate filtered tags in mode line.

* lisp/org-agenda.el (org-agenda-abbreviate-tag-filter): New variable.
  (org-agenda-set-mode-name): Abbreviate tag filter if option is set.
---
 lisp/org-agenda.el |   25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index 428d31f..69c3d38 100644
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -236,6 +236,12 @@ you can \"misuse\" it to also add other text to the 
header."
   :group 'org-agenda
   :type 'boolean)
 
+(defcustom org-agenda-abbreviate-tag-filter nil
+  "When set, abbreviate filtered tags indicated in mode line.
+Tags are abbreviated with their fast selection letters, as configured."
+  :group 'org-agenda
+  :type 'boolean)
+
 (defgroup org-agenda-custom-commands nil
   "Options concerning agenda views in Org-mode."
   :tag "Org Agenda Custom Commands"
@@ -8227,9 +8233,22 @@ When called with a prefix argument, include all archive 
files as well."
                           (concat " {"
                                   (mapconcat
                                    'identity
-                                   (append
-                                    (get 'org-agenda-tag-filter :preset-filter)
-                                    org-agenda-tag-filter)
+                                   (mapcar
+                                    (lambda (f)
+                                      (if (and org-agenda-abbreviate-tag-filter
+                                               (string-match
+                                                "^\\([+-]\\)\\(.+\\)" f))
+                                          (let* ((dir (match-string 1 f))
+                                                 (f0 (match-string 2 f))
+                                                 (alist 
org-tag-alist-for-agenda)
+                                                 (a (assoc f0 alist)))
+                                            (if a
+                                                (format "%s%c." dir (cdr a))
+                                              f))
+                                        f))
+                                    (append
+                                     (get 'org-agenda-tag-filter 
:preset-filter)
+                                     org-agenda-tag-filter))
                                    "")
                                   "}")
                           'face 'org-agenda-filter-tags
-- 
1.7.10.4