Allow more flexible customization of clocksum format

* lisp/org.el (org-time-clocksum-format, org-time-clocksum-fractional-format):
in addition to a single format string, the clocksum formats can now be
plists specifying separate formats for different time units.

* lisp/org.el (org-minutes-to-clocksum-string): new function to
replace org-minutes-to-hh:mm-string, which converts a number of
minutes to a string according to the customization options.

* lisp/org-colview.el (org-columns-number-to-string): use new
org-minutes-to-clocksum-string function to format clocksum durations.

* lisp/org-clock.el: always call new org-minutes-to-clocksum-string
function when formatting time durations, instead of calling
org-minutes-to-hh:mm-string or passing org-time-clocksum-format
directly to format.

lisp/org-clock.el

@@ -556,28 +556,23 @@ pointing to it."
 If an effort estimate was defined for the current item, use
 01:30/01:50 format (clocked/estimated).
 If not, show simply the clocked time like 01:50."
-  (let* ((clocked-time (org-clock-get-clocked-time))
-	 (h (floor clocked-time 60))
-	 (m (- clocked-time (* 60 h))))
+  (let ((clocked-time (org-clock-get-clocked-time)))
     (if org-clock-effort
 	(let* ((effort-in-minutes
 		(org-duration-string-to-minutes org-clock-effort))
-	       (effort-h (floor effort-in-minutes 60))
-	       (effort-m (- effort-in-minutes (* effort-h 60)))
 	       (work-done-str
 		(org-propertize
-		 (format org-time-clocksum-format h m)
+		 (org-minutes-to-clocksum-string clocked-time)
 		 'face (if (and org-clock-task-overrun (not org-clock-task-overrun-text))
 			   'org-mode-line-clock-overrun 'org-mode-line-clock)))
-	       (effort-str (format org-time-clocksum-format effort-h effort-m))
+	       (effort-str (org-minutes-to-clocksum-string effort-in-minutes))
 	       (clockstr (org-propertize
 			  (concat  " [%s/" effort-str
 				   "] (" (replace-regexp-in-string "%" "%%" org-clock-heading) ")")
 			  'face 'org-mode-line-clock)))
 	  (format clockstr work-done-str))
-      (org-propertize (format
-		       (concat "[" org-time-clocksum-format " (%s)]")
-		       h m org-clock-heading)
+      (org-propertize (concat "[" (org-minutes-to-clocksum-string clocked-time)
+			      (format " (%s)" org-clock-heading) "]")
 		      'face 'org-mode-line-clock))))
 
 (defun org-clock-get-last-clock-out-time ()
@@ -650,7 +645,7 @@ the mode line."
 	      (setq value (- current value))
 	    (if (equal ?+ sign) (setq value (+ current value)))))
 	(setq value (max 0 value)
-	      org-clock-effort (org-minutes-to-hh:mm-string value))
+	      org-clock-effort (org-minutes-to-clocksum-string value))
 	(org-entry-put org-clock-marker "Effort" org-clock-effort)
 	(org-clock-update-mode-line)
 	(message "Effort is now %s" org-clock-effort))
@@ -1528,8 +1523,9 @@ to, overriding the existing value of `org-clock-out-switch-to-state'."
 						"\\>"))))
 		  (org-todo org-clock-out-switch-to-state))))))
 	  (force-mode-line-update)
-	  (message (concat "Clock stopped at %s after HH:MM = " org-time-clocksum-format "%s") te h m
-		   (if remove " => LINE REMOVED" ""))
+	  (message (concat "Clock stopped at %s after "
+			   (org-minutes-to-clocksum-string (+ (* 60 h) m)) "%s")
+		   te (if remove " => LINE REMOVED" ""))
           (run-hooks 'org-clock-out-hook)
 	  (unless (org-clocking-p)
 	    (org-clock-delete-current)))))))
@@ -1797,12 +1793,9 @@ Use \\[org-clock-remove-overlays] to remove the subtree times."
 	(when org-remove-highlights-with-change
 	  (org-add-hook 'before-change-functions 'org-clock-remove-overlays
 			nil 'local))))
-    (if org-time-clocksum-use-fractional
-	(message (concat "Total file time: " org-time-clocksum-fractional-format
-			 " (%d hours and %d minutes)")
-		 (/ (+ (* h 60.0) m) 60.0) h m)
-      (message (concat "Total file time: " org-time-clocksum-format
-		       " (%d hours and %d minutes)") h m h m))))
+      (message (concat "Total file time: "
+		       (org-minutes-to-clocksum-string org-clock-file-total-minutes)
+		       " (%d hours and %d minutes)") h m)))
 
 (defvar org-clock-overlays nil)
 (make-variable-buffer-local 'org-clock-overlays)
@@ -1814,9 +1807,6 @@ This creates a new overlay and stores it in `org-clock-overlays', so that it
 will be easy to remove."
   (let* ((c 60) (h (floor (/ time 60))) (m (- time (* 60 h)))
 	 (l (if level (org-get-valid-level level 0) 0))
-	 (fmt (concat "%s " (if org-time-clocksum-use-fractional
-				org-time-clocksum-fractional-format
-			      org-time-clocksum-format) "%s"))
 	 (off 0)
 	 ov tx)
     (org-move-to-column c)
@@ -1825,14 +1815,9 @@ will be easy to remove."
     (setq ov (make-overlay (point-at-bol) (point-at-eol))
     	  tx (concat (buffer-substring (point-at-bol) (point))
 		     (make-string (+ off (max 0 (- c (current-column)))) ?.)
-		     (org-add-props (if org-time-clocksum-use-fractional
-					(format fmt
-						(make-string l ?*)
-						(/ (+ (* h 60.0) m) 60.0)
-						(make-string (- 16 l) ?\ ))
-				      (format fmt
-					      (make-string l ?*) h m
-					      (make-string (- 16 l) ?\ )))
+		     (org-add-props (concat (make-string l ?*) " "
+					    (org-minutes-to-clocksum-string time)
+					    (make-string (- 16 l) ?\ ))
 			 (list 'face 'org-clock-overlay))
 		     ""))
     (if (not (featurep 'xemacs))
@@ -2392,7 +2377,7 @@ from the dynamic block definition."
      (if properties (make-string (length properties) ?|) "")  ; properties columns, maybe
      (concat (format org-clock-total-time-cell-format (nth 7 lwords))  "| ") ; instead of a headline
      (format org-clock-total-time-cell-format
-	     (org-minutes-to-hh:mm-string (or total-time 0))) ; the time
+	     (org-minutes-to-clocksum-string (or total-time 0))) ; the time
      "|\n")                          ; close line
 
     ;; Now iterate over the tables and insert the data
@@ -2416,7 +2401,7 @@ from the dynamic block definition."
 		     (if level-p   "| " "") ; level column, maybe
 		     (if timestamp "| " "") ; timestamp column, maybe
 		     (if properties (make-string (length properties) ?|) "")  ;properties columns, maybe
-		     (org-minutes-to-hh:mm-string (nth 1 tbl))))) ; the time
+		     (org-minutes-to-clocksum-string (nth 1 tbl))))) ; the time
 
 	  ;; Get the list of node entries and iterate over it
 	  (setq entries (nth 2 tbl))
@@ -2449,7 +2434,7 @@ from the dynamic block definition."
 	     hlc headline hlc "|"                                ; headline
 	     (make-string (min (1- ntcol) (or (- level 1))) ?|)
 					; empty fields for higher levels
-	     hlc (org-minutes-to-hh:mm-string (nth 3 entry)) hlc ; time
+	     hlc (org-minutes-to-clocksum-string (nth 3 entry)) hlc ; time
 	     "|\n"                                               ; close line
 	     )))))
     ;; When exporting subtrees or regions the region might be

lisp/org-colview.el

@@ -1058,8 +1058,7 @@ Don't set this, this is meant for dynamic scoping.")
    ((memq fmt '(estimate)) (org-estimate-print n printf))
    ((not (numberp n)) "")
    ((memq fmt '(add_times max_times min_times mean_times))
-    (let* ((h (floor n)) (m (floor (+ 0.5 (* 60 (- n h))))))
-      (format org-time-clocksum-format h m)))
+    (org-hours-to-clocksum-string n))
    ((eq fmt 'checkbox)
     (cond ((= n (floor n)) "[X]")
 	  ((> n 1.) "[-]")

lisp/org.el

@@ -2714,11 +2714,79 @@ commands, if custom time display is turned on at the time of export."
 	(concat "[" (substring f 1 -1) "]")
       f)))
 
-(defcustom org-time-clocksum-format "%d:%02d"
+(defcustom org-time-clocksum-format
+  '(:days "%dd " :hours "%d" :require-hours t :minutes ":%02d" :require-minutes t)
   "The format string used when creating CLOCKSUM lines.
-This is also used when org-mode generates a time duration."
+This is also used when Org mode generates a time duration.
+
+The value can be a single format string containing two
+%-sequences, which will be filled with the number of hours and
+minutes in that order.
+
+Alternatively, the value can be a plist associating any of the
+keys :years, :months, :weeks, :days, :hours or :minutes with
+format strings.  The time duration is formatted using only the
+time components that are needed and concatenating the results.
+If a time unit in absent, it falls back to the next smallest
+unit.
+
+The keys :require-years, :require-months, :require-days,
+:require-weeks, :require-hours, :require-minutes are also
+meaningful.  A non-nil value for these keys indicates that the
+corresponding time component should always be included, even if
+its value is 0.
+
+
+For example,
+
+  \(:days \"%dd\" :hours \"%d\" :require-hours t :minutes \":%02d\"
+    :require-minutes t)
+
+means durations longer than a day will be expressed in days,
+hours and minutes, and durations less than a day will always be
+expressed in hours and minutes (even for durations less than an
+hour).
+
+The value
+
+  \(:days \"%dd\" :minutes \"%dm\")
+
+means durations longer than a day will be expressed in days and
+minutes, and durations less than a day will be expressed entirely
+in minutes (even for durations longer than an hour)."
   :group 'org-time
-  :type 'string)
+  :type '(choice (string :tag "Format string")
+		 (set :tag "Plist"
+		      (group :inline t (const :tag "Years" :years)
+			     (string :tag "Format string"))
+		      (group :inline t
+			     (const :tag "Always show years" :require-years)
+			     (const t))
+		      (group :inline t (const :tag "Months" :months)
+			     (string :tag "Format string"))
+		      (group :inline t
+			     (const :tag "Always show months" :require-months)
+			     (const t))
+		      (group :inline t (const :tag "Weeks" :weeks)
+			     (string :tag "Format string"))
+		      (group :inline t
+			     (const :tag "Always show weeks" :require-weeks)
+			     (const t))
+		      (group :inline t (const :tag "Days" :days)
+			     (string :tag "Format string"))
+		      (group :inline t
+			     (const :tag "Always show days" :require-days)
+			     (const t))
+		      (group :inline t (const :tag "Hours" :hours)
+			     (string :tag "Format string"))
+		      (group :inline t
+			     (const :tag "Always show hours" :require-hours)
+			     (const t))
+		      (group :inline t (const :tag "Minutes" :minutes)
+			     (string :tag "Format string"))
+		      (group :inline t
+			     (const :tag "Always show minutes" :require-minutes)
+			     (const t)))))
 
 (defcustom org-time-clocksum-use-fractional nil
   "If non-nil, \\[org-clock-display] uses fractional times.
@@ -2727,10 +2795,34 @@ org-mode generates a time duration."
   :type 'boolean)
 
 (defcustom org-time-clocksum-fractional-format "%.2f"
-  "The format string used when creating CLOCKSUM lines, or when
-org-mode generates a time duration."
+  "The format string used when creating CLOCKSUM lines,
+or when Org mode generates a time duration, if
+`org-time-clocksum-use-fractional' is enabled.
+
+The value can be a single format string containing one
+%-sequence, which will be filled with the number of hours as
+a float.
+
+Alternatively, the value can be a plist associating any of the
+keys :years, :months, :weeks, :days, :hours or :minutes with
+a format string.  The time duration is formatted using the
+largest time unit which gives a non-zero integer part.  If all
+specified formats have zero integer part, the smallest time unit
+is used."
   :group 'org-time
-  :type 'string)
+  :type '(choice (string :tag "Format string")
+		 (set (group :inline t (const :tag "Years" :years)
+			    (string :tag "Format string"))
+		      (group :inline t (const :tag "Months" :months)
+			    (string :tag "Format string"))
+		      (group :inline t (const :tag "Weeks" :weeks)
+			     (string :tag "Format string"))
+		      (group :inline t (const :tag "Days" :days)
+			     (string :tag "Format string"))
+		      (group :inline t (const :tag "Hours" :hours)
+			     (string :tag "Format string"))
+		      (group :inline t (const :tag "Minutes" :minutes)
+			     (string :tag "Format string")))))
 
 (defcustom org-deadline-warning-days 14
   "No. of days before expiration during which a deadline becomes active.
@@ -16667,11 +16759,88 @@ If there is already a time stamp at the cursor position, update it."
       (org-insert-time-stamp
        (encode-time 0 0 0 (nth 1 cal-date) (car cal-date) (nth 2 cal-date))))))
 
-(defun org-minutes-to-hh:mm-string (m)
-  "Compute H:MM from a number of minutes."
-  (let ((h (/ m 60)))
-    (setq m (- m (* 60 h)))
-    (format org-time-clocksum-format h m)))
+(defun org-minutes-to-clocksum-string (m)
+  "Format number of minutes as a clocksum string.
+The format is determined by `org-time-clocksum-format',
+`org-time-clocksum-use-fractional' and
+`org-time-clocksum-fractional-format'."
+  (let ((clocksum "") fmt n)
+    ;; fractional format
+    (if org-time-clocksum-use-fractional
+	(cond
+	 ;; single format string
+	 ((stringp org-time-clocksum-fractional-format)
+	  (format org-time-clocksum-fractional-format (/ m 60.0)))
+	 ;; choice of fractional formats for different time units
+	 ((and (setq fmt (plist-get org-time-clocksum-fractional-format :years))
+	       (> (/ m (* 365 24 60)) 0))
+	  (format fmt (/ m (* 365 24 60.0))))
+	 ((and (setq fmt (plist-get org-time-clocksum-fractional-format :months))
+	       (> (/ m (* 30 24 60)) 0))
+	  (format fmt (/ m (* 30 24 60.0))))
+	 ((and (setq fmt (plist-get org-time-clocksum-fractional-format :weeks))
+	       (> (/ m (* 7 24 60)) 0))
+	  (format fmt (/ m (* 7 24 60.0))))
+	 ((and (setq fmt (plist-get org-time-clocksum-fractional-format :days))
+	       (> (/ m (* 24 60)) 0))
+	  (format fmt (/ m (* 24 60.0))))
+	 ((and (setq fmt (plist-get org-time-clocksum-fractional-format :hours))
+	       (> (/ m 60) 0))
+	  (format fmt (/ m 60.0)))
+	 ((setq fmt (plist-get org-time-clocksum-fractional-format :minutes))
+	  (format fmt m))
+	 ;; fall back to smallest time unit with a format
+	 ((setq fmt (plist-get org-time-clocksum-fractional-format :hours))
+	  (format fmt (/ m 60.0)))
+	 ((setq fmt (plist-get org-time-clocksum-fractional-format :days))
+	  (format fmt (/ m (* 24 60.0))))
+	 ((setq fmt (plist-get org-time-clocksum-fractional-format :weeks))
+	  (format fmt (/ m (* 7 24 60.0))))
+	 ((setq fmt (plist-get org-time-clocksum-fractional-format :months))
+	  (format fmt (/ m (* 30 24 60.0))))
+	 ((setq fmt (plist-get org-time-clocksum-fractional-format :years))
+	  (format fmt (/ m (* 365 24 60.0)))))
+      ;; standard (non-fractional) format, with single format string
+      (if (stringp org-time-clocksum-format)
+	  (format org-time-clocksum-format (setq n (/ m 60)) (- m (* 60 n)))
+	;; separate formats components
+	(and (setq fmt (plist-get org-time-clocksum-format :years))
+	     (or (> (setq n (/ m (* 365 24 60))) 0)
+		 (plist-get org-time-clocksum-format :require-years))
+	     (setq clocksum (concat clocksum (format fmt n))
+		   m (- m (* n 365 24 60))))
+	(and (setq fmt (plist-get org-time-clocksum-format :months))
+	     (or (> (setq n (/ m (* 30 24 60))) 0)
+		 (plist-get org-time-clocksum-format :require-months))
+	     (setq clocksum (concat clocksum (format fmt n))
+		   m (- m (* n 30 24 60))))
+	(and (setq fmt (plist-get org-time-clocksum-format :weeks))
+	     (or (> (setq n (/ m (* 7 24 60))) 0)
+		 (plist-get org-time-clocksum-format :require-weeks))
+	     (setq clocksum (concat clocksum (format fmt n))
+		   m (- m (* n 7 24 60))))
+	(and (setq fmt (plist-get org-time-clocksum-format :days))
+	     (or (> (setq n (/ m (* 24 60))) 0)
+		 (plist-get org-time-clocksum-format :require-days))
+	     (setq clocksum (concat clocksum (format fmt n))
+		   m (- m (* n 24 60))))
+	(and (setq fmt (plist-get org-time-clocksum-format :hours))
+	     (or (> (setq n (/ m 60)) 0)
+		 (plist-get org-time-clocksum-format :require-hours))
+	     (setq clocksum (concat clocksum (format fmt n))
+		   m (- m (* n 60))))
+	(and (setq fmt (plist-get org-time-clocksum-format :minutes))
+	     (or (> m 0) (plist-get org-time-clocksum-format :require-minutes))
+	     (setq clocksum (concat clocksum (format fmt m))))
+	;; return formatted time duration
+	clocksum))))
+
+(defalias 'org-minutes-to-hh:mm-string 'org-minutes-to-clocksum-string)
+(make-obsolete 'org-minutes-to-hh:mm-string 'org-minutes-to-clocksum-string
+	       "Org mode version 8.0")
+
+(defun org-hours-to-clocksum-string (n)
+  (org-minutes-to-clocksum-string (* n 60)))
 
 (defun org-hh:mm-string-to-minutes (s)
   "Convert a string H:MM to a number of minutes.