From 4eb0c3011fecb69c6ac5867970e033c62352c2b2 Mon Sep 17 00:00:00 2001
From: Mikhail Skorzhinskii <mskorzhinskiy@eml.cc>
Date: Sat, 12 Sep 2020 18:10:05 +0200
Subject: [PATCH] org-agenda.el: allow to customize outline path in echo area

Some of the org-mode data bases auto-generate file names, so they don't
carry a lot of information and can be noisy. Allowing user to show
document titles instead could be useful. Showing titles is disabled by
default.
---
 etc/ORG-NEWS       |  6 ++++++
 lisp/org-agenda.el | 11 ++++++++---
 lisp/org.el        | 25 ++++++++++++++++++++++---
 3 files changed, 36 insertions(+), 6 deletions(-)

diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 0ed626fb7..e30336f45 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -11,6 +11,12 @@ See the end of the file for license conditions.
 Please send Org bug reports to mailto:emacs-orgmode@gnu.org.
 
 * Version 9.5 (not yet released)
+** New options and settings
+*** New option value for ~org-agenda-show-outline-path~
+
+When set to 'title, will show document title in outline path in echo
+area instead of file name.
+
 * Version 9.4
 ** Incompatible changes
 *** Possibly broken internal file links: please check and fix
diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index 82fe6091c..17e189317 100644
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -1040,9 +1040,14 @@ current item's tree, in an indirect buffer."
   :type 'boolean)
 
 (defcustom org-agenda-show-outline-path t
-  "Non-nil means show outline path in echo area after line motion."
+  "Non-nil means show outline path in echo area after line motion.
+
+If set to 'title, show document title."
   :group 'org-agenda-startup
-  :type 'boolean)
+  :type '(choice
+	  (const :tag "Don't show outline path in agenda view." nil)
+	  (const :tag "Show outline path with prepended file name." t)
+	  (const :tag "Show outline path with prepended document title. Fallback to file name is no title is present." title)))
 
 (defcustom org-agenda-start-with-entry-text-mode nil
   "The initial value of entry-text-mode in a newly created agenda window."
@@ -8777,7 +8782,7 @@ When called with a prefix argument, include all archive files as well."
 	       (org-agenda-tree-to-indirect-buffer nil)
 	     (org-agenda-show)))
       (and org-agenda-show-outline-path
-	   (org-with-point-at m (org-display-outline-path t))))))
+	   (org-with-point-at m (org-display-outline-path org-agenda-show-outline-path))))))
 
 (defun org-agenda-show-tags ()
   "Show the tags applicable to the current item."
diff --git a/lisp/org.el b/lisp/org.el
index a9fdc7b77..191918860 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -8023,10 +8023,24 @@ the default is \"/\"."
 	(setf (substring fpath (- width 2)) "..")))
     fpath))
 
-(defun org-display-outline-path (&optional file current separator just-return-string)
+(defun org-get-title-from-file (file)
+  "Collect tilte from the provided `org-mode' FILE."
+  (let (title)
+    (when file
+      (with-current-buffer
+	  (get-file-buffer file)
+	(pcase (org-collect-keywords '("TITLE"))
+	  (`(("TITLE" . ,val))
+	   (setq title (car val)))))
+      title)))
+
+
+(defun org-display-outline-path (&optional file-or-title current separator just-return-string)
   "Display the current outline path in the echo area.
 
-If FILE is non-nil, prepend the output with the file name.
+If FILE-OR-TITLE is 'title, prepend outline with file title.  If
+it is non-nil or title is not present in document, prepend
+outline path with the file name.
 If CURRENT is non-nil, append the current heading to the output.
 SEPARATOR is passed through to `org-format-outline-path'.  It separates
 the different parts of the path and defaults to \"/\".
@@ -8034,6 +8048,8 @@ If JUST-RETURN-STRING is non-nil, return a string, don't display a message."
   (interactive "P")
   (let* (case-fold-search
 	 (bfn (buffer-file-name (buffer-base-buffer)))
+	 (title (when (and file-or-title (string= file-or-title 'title))
+		  (org-get-title-from-file bfn)))
 	 (path (and (derived-mode-p 'org-mode) (org-get-outline-path)))
 	 res)
     (when current (setq path (append path
@@ -8045,7 +8061,10 @@ If JUST-RETURN-STRING is non-nil, return a string, don't display a message."
 	  (org-format-outline-path
 	   path
 	   (1- (frame-width))
-	   (and file bfn (concat (file-name-nondirectory bfn) separator))
+	   (and file-or-title bfn (concat (if (and (string= file-or-title 'title) title)
+					      title
+					    (file-name-nondirectory bfn))
+				 separator))
 	   separator))
     (add-face-text-property 0 (length res)
 			    `((t :height ,(face-attribute 'default :height)))
-- 
2.28.0