Rebind `org-agenda-priority' to `C-c ," in agenda mode (`C-u C-c ,' now shows priority)

* org.el (org-priority): Use a new argument to show priority
instead of setting it.
(org-show-priority): New function to show priority both in
normal Org buffers and in Org Agenda buffers.
(org-speed-commands-default): Use "," as a speed command for
setting priority.

* org-agenda.el (org-agenda-mode-map): Bind
`org-agenda-priority' to `C-c ,' as it was before.
(org-agenda-show-priority): Delete.
(org-agenda-priority): Use a new argument to show priority
instead of setting it.

Thanks to Robert Horn for triggering this change.

lisp/org-agenda.el

@@ -2088,8 +2088,8 @@ The following commands are available:
 (org-defkey org-agenda-mode-map "\C-c\C-a" 'org-attach)
 (org-defkey org-agenda-mode-map "\C-c\C-n" 'org-agenda-next-date-line)
 (org-defkey org-agenda-mode-map "\C-c\C-p" 'org-agenda-previous-date-line)
+(org-defkey org-agenda-mode-map "\C-c," 'org-agenda-priority)
 (org-defkey org-agenda-mode-map "," 'org-agenda-priority)
-(org-defkey org-agenda-mode-map "\C-c," 'org-agenda-show-priority)
 (org-defkey org-agenda-mode-map "i" 'org-agenda-diary-entry)
 (org-defkey org-agenda-mode-map "c" 'org-agenda-goto-calendar)
 (org-defkey org-agenda-mode-map "C" 'org-agenda-convert-date)
@@ -2255,7 +2255,7 @@ The following commands are available:
      ["Set Priority" org-agenda-priority t]
      ["Increase Priority" org-agenda-priority-up t]
      ["Decrease Priority" org-agenda-priority-down t]
-     ["Show Priority" org-agenda-show-priority t])
+     ["Show Priority" org-show-priority t])
     ("Calendar/Diary"
      ["New Diary Entry" org-agenda-diary-entry (org-agenda-check-type nil 'agenda 'timeline)]
      ["Goto Calendar" org-agenda-goto-calendar (org-agenda-check-type nil 'agenda 'timeline)]
@@ -7489,14 +7489,6 @@ When called with a prefix argument, include all archive files as well."
       (and org-agenda-show-outline-path
 	   (org-with-point-at m (org-display-outline-path t))))))
 
-(defun org-agenda-show-priority ()
-  "Show the priority of the current item.
-This priority is composed of the main priority given with the [#A] cookies,
-and by additional input from the age of a schedules or deadline entry."
-  (interactive)
-  (let* ((pri (org-get-at-bol 'priority)))
-    (message "Priority is %d" (if pri pri -1000))))
-
 (defun org-agenda-show-tags ()
   "Show the tags applicable to the current item."
   (interactive)
@@ -8085,11 +8077,12 @@ If FORCE-TAGS is non nil, the car of it returns the new tags."
   (interactive)
   (org-agenda-priority 'down))
 
-(defun org-agenda-priority (&optional force-direction)
+(defun org-agenda-priority (&optional force-direction show)
   "Set the priority of line at point, also in Org-mode file.
 This changes the line at point, all other lines in the agenda referring to
 the same tree node, and the headline of the tree node in the Org-mode file."
-  (interactive)
+  (interactive "P")
+  (if (equal force-direction '(4)) (setq show t))
   (unless org-enable-priority-commands
     (error "Priority commands are disabled"))
   (org-agenda-check-no-diary)
@@ -8108,7 +8101,7 @@ the same tree node, and the headline of the tree node in the Org-mode file."
 	(save-excursion
 	  (and (outline-next-heading)
 	       (org-flag-heading nil)))   ; show the next heading
-	(funcall 'org-priority force-direction)
+	(funcall 'org-priority force-direction show)
 	(end-of-line 1)
 	(setq newhead (org-get-heading)))
       (org-agenda-change-all-lines newhead hdmarker)

lisp/org.el

@@ -12997,10 +12997,12 @@ from the `before-change-functions' in the current buffer."
   (interactive)
   (org-priority 'down))
 
-(defun org-priority (&optional action)
+(defun org-priority (&optional action show)
   "Change the priority of an item.
 ACTION can be `set', `up', `down', or a character."
-  (interactive)
+  (interactive "P")
+  (if (equal action '(4))
+      (org-show-priority)
   (unless org-enable-priority-commands
     (error "Priority commands are disabled"))
   (setq action (or action 'set))
@@ -13077,7 +13079,21 @@ ACTION can be `set', `up', `down', or a character."
       (org-preserve-lc (org-set-tags nil 'align)))
     (if remove
 	(message "Priority removed")
-      (message "Priority of current item set to %s" news))))
+      (message "Priority of current item set to %s" news)))))
+
+(defun org-show-priority ()
+  "Show the priority of the current item.
+This priority is composed of the main priority given with the [#A] cookies,
+and by additional input from the age of a schedules or deadline entry."
+  (interactive)
+  (let ((pri (if (eq major-mode 'org-agenda-mode)
+		 (org-get-at-bol 'priority)
+	       (save-excursion
+		 (save-match-data
+		   (beginning-of-line)
+		   (and (looking-at org-heading-regexp)
+			(org-get-priority (match-string 0))))))))
+    (message "Priority is %d" (if pri pri -1000))))
 
 (defun org-get-priority (s)
   "Find priority cookie and return priority."
@@ -18161,6 +18177,7 @@ BEG and END default to the buffer boundaries."
     ("O" . org-clock-out)
     ("Meta Data Editing")
     ("t" . org-todo)
+    ("," . (org-priority))
     ("0" . (org-priority ?\ ))
     ("1" . (org-priority ?A))
     ("2" . (org-priority ?B))