Re-order the items in `profiler-report' output.

Putting the usage figures first on the line will eliminate the truncation of
function names.

lisp/profiler.el (profiler-version): Change to "28.1".
(profiler-format): Enhance, so that a width of zero means print the string
without padding or truncation.
(profiler-report-cpu-line-format, profiler-report-memory-line-format): Amend
for the new layout.  The number of places for the cpu samples has been reduced
from 19 to 12 (enough for ~30 years at 1,000 samples per second).
(profiler-report-line-format, profiler-report-describe-entry): Amend for the
new order of arguments to profiler-format.

etc/NEWS (Specialized Modes): Add an entry documenting this change.

doc/lispref/debugging.texi (Profiling): Describe the new ordering of the items
in place of the old ordering.

3 files changed, 32 insertions, 17 deletions

diff --git a/doc/lispref/debugging.texi b/doc/lispref/debugging.texi
index 3fea604184c..661961f9379 100644
--- a/doc/lispref/debugging.texi
+++ b/doc/lispref/debugging.texi
@@ -1009,13 +1009,14 @@ profiling, so we don't recommend leaving it active except when you are
 actually running the code you want to examine).
 
 The profiler report buffer shows, on each line, a function that was
-called, followed by how much resources (cpu or memory) it used in
+called, preceded by how much resources (cpu or memory) it used in
 absolute and percentage terms since profiling started.  If a given
-line has a @samp{+} symbol at the left-hand side, you can expand that
-line by typing @kbd{@key{RET}}, in order to see the function(s) called
-by the higher-level function.  Use a prefix argument (@kbd{C-u
-@key{RET}}) to see the whole call tree below a function.  Pressing
-@kbd{@key{RET}} again will collapse back to the original state.
+line has a @samp{+} symbol to the left of the function name, you can
+expand that line by typing @kbd{@key{RET}}, in order to see the
+function(s) called by the higher-level function.  Use a prefix
+argument (@kbd{C-u @key{RET}}) to see the whole call tree below a
+function.  Pressing @kbd{@key{RET}} again will collapse back to the
+original state.
 
 Press @kbd{j} or @kbd{mouse-2} to jump to the definition of a function
 at point.  Press @kbd{d} to view a function's documentation.  You can
diff --git a/etc/NEWS b/etc/NEWS
index 46b8435a14d..92493b70a0c 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -303,6 +303,14 @@ the buffer cycles the whole buffer between "only top-level headings",
 
 * Changes in Specialized Modes and Packages in Emacs 28.1
 
++++
+** profiler.el
+The results displayed by 'profiler-report' now have the usage figures
+at the left hand side followed by the function name.  This is intended
+to make better use of the horizontal space, in particular eliminating
+the truncation of function names.  There is no way to get the former
+layout back.
+
 ** Loading dunnet.el in batch mode doesn't start the game any more.
 Instead you need to do "emacs -f dun-batch" to start the game in
 batch mode.
diff --git a/lisp/profiler.el b/lisp/profiler.el
index bf8aacccc37..13ac040f565 100644
--- a/lisp/profiler.el
+++ b/lisp/profiler.el
@@ -34,7 +34,7 @@
   :version "24.3"
   :prefix "profiler-")
 
-(defconst profiler-version "24.3")
+(defconst profiler-version "28.1")
 
 (defcustom profiler-sampling-interval 1000000
   "Default sampling interval in nanoseconds."
@@ -85,6 +85,9 @@
 		      (t
 		       (profiler-ensure-string arg)))
 	   for len = (length str)
+           if (zerop width)
+           collect str into frags
+           else
 	   if (< width len)
            collect (progn (put-text-property (max 0 (- width 2)) len
                                              'invisible 'profiler str)
@@ -445,14 +448,16 @@ Optional argument MODE means only check for the specified mode (cpu or mem)."
   :group 'profiler)
 
 (defvar profiler-report-cpu-line-format
-  '((50 left)
-    (24 right ((19 right)
-	       (5 right)))))
+  '((14 right ((9 right)
+	       (5 right)))
+    (1 left "%s")
+    (0 left)))
 
 (defvar profiler-report-memory-line-format
-  '((55 left)
-    (19 right ((14 right profiler-format-number)
-	       (5 right)))))
+  '((20 right ((15 right profiler-format-number)
+	       (5 right)))
+    (1 left "%s")
+    (0 left)))
 
 (defvar-local profiler-report-profile nil
   "The current profile.")
@@ -505,13 +510,14 @@ RET: expand or collapse"))
     (profiler-format (cl-ecase (profiler-profile-type profiler-report-profile)
 		       (cpu profiler-report-cpu-line-format)
 		       (memory profiler-report-memory-line-format))
-		     name-part
 		     (if diff-p
 			 (list (if (> count 0)
 				   (format "+%s" count)
 				 count)
 			       "")
-		       (list count count-percent)))))
+		       (list count count-percent))
+                     " "
+                     name-part)))
 
 (defun profiler-report-insert-calltree (tree)
   (let ((line (profiler-report-line-format tree)))
@@ -735,11 +741,11 @@ below entry at point."
 	    (cpu
 	     (profiler-report-header-line-format
 	      profiler-report-cpu-line-format
-	      "Function" (list "CPU samples" "%")))
+	      (list "Samples" "%") " " "Function"))
 	    (memory
 	     (profiler-report-header-line-format
 	      profiler-report-memory-line-format
-	      "Function" (list "Bytes" "%")))))
+	      (list "Bytes" "%") " " "Function"))))
     (let ((predicate (cl-ecase order
 		       (ascending #'profiler-calltree-count<)
 		       (descending #'profiler-calltree-count>))))