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+;;; profile-dotemacs.el --- Profile your Emacs init file
+
+;; Copyright (C) 2010, 2012  David Engster
+
+;; Author: David Engster <dengste@eml.cc>
+
+;; This file is NOT part of GNU Emacs.
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License
+;; as published by the Free Software Foundation; either version 2
+;; of the License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This is to easily profile your Emacs init file (or any other
+;; script-like Emacs Lisp file, for that matter).
+
+;; It will go over all sexp's (balanced expressions) in the file and
+;; run them through `benchmark-run'.  It will then show the file with
+;; overlays applied in a way that let you easily find out which sexp's
+;; take the most time.  Since time is relative, it's not the absolute
+;; value that counts but the percentage of the total running time.
+;;
+;; * All other sexp's with a percentage greater than
+;;   `profile-dotemacs-low-percentage' will be preceded by a
+;;   highlighted line, showing the results from `benchmark-run'.
+;;   Also, the more 'reddish' the background of the sexp, the more
+;;   time it needs.
+
+;; * All other sexp's will be grayed out to indicate that their
+;;   running time is miniscule.  You can still see the benchmark
+;;   results in the minibuffer by hovering over the sexp with the
+;;   mouse.
+
+;; You can only benchmark full sexp's, so if you wrapped large parts
+;; of your init file in some conditional clause, you'll have to remove
+;; that for getting finer granularity.
+
+;;; Usage:
+
+;; Start emacs as follows:
+;;
+;;    emacs -Q -l <PATH>/profile-dotemacs.el -f profile-dotemacs
+;;
+;; with <PATH> being the path to where this file resides.
+
+;;; Caveats (thanks to Raffaele Ricciardi for reporting those):
+
+;; - The usual `--debug-init' for debugging your init file won't work
+;;   with profile-dotemacs, so you'll have to call
+;;   `toggle-debug-on-error', either on the commandline or at the
+;;   beginning of your init file.
+;; - `load-file-name' is nil when the init file is being loaded
+;;   by the profiler.  This might matter if you perform the
+;;   bulk of initializations in a different file.
+;; - Starting external shells like IELM or eshell in your init file
+;;   might mess with overlay creation, so this must not be done.
+
+;;; Download:
+
+;;  You can always get the latest version from
+;;       http://randomsample.de/profile-dotemacs.el
+
+;; Aryadev Chavali: customised for this emacs specifically.
+
+;;; Code:
+
+(require 'thingatpt)
+(require 'benchmark)
+
+;; User variables
+
+(defvar profile-dotemacs-file "~/.config/emacs/init.el"
+  "File to be profiled.")
+
+(defvar profile-dotemacs-low-percentage 3
+  "Percentage which should be considered low.
+All sexp's with a running time below this percentage will be
+grayed out.")
+
+(defface profile-dotemacs-time-face
+  '((((background dark)) (:background "OrangeRed1"))
+    (t (:background "red3")))
+  "Background color to indicate percentage of total time.")
+
+(defface profile-dotemacs-low-percentage-face
+  '((((background dark)) (:foreground "gray25"))
+    (t (:foreground "gray75")))
+  "Face for sexps below `profile-dotemacs-low-percentage'.")
+
+(defface profile-dotemacs-highlight-face
+  '((((background dark)) (:background "blue"))
+    (t (:background "yellow")))
+  "Highlight face for benchmark results.")
+
+;; Main function
+
+(defun profile-dotemacs ()
+  "Load `profile-dotemacs-file' and benchmark its sexps."
+  (interactive)
+  (with-current-buffer (find-file-noselect profile-dotemacs-file t)
+    (setq buffer-read-only t) ;; just to be sure
+    (goto-char (point-min))
+    (let (start end results)
+      (while
+	  (< (point)
+	     (setq end (progn
+			 (forward-sexp 1)
+			 (point))))
+	(forward-sexp -1)
+	(setq start (point))
+	(add-to-list
+	 'results
+	 `(,start ,end
+		  ,(benchmark-run
+		    (eval (sexp-at-point)))))
+	(goto-char end))
+      (profile-dotemacs-show-results results)
+      (switch-to-buffer (current-buffer)))))
+
+;; Helper functions
+
+(defun profile-dotemacs-show-results (results)
+  "Show timings from RESULTS in current buffer."
+  (let ((totaltime (profile-dotemacs-totaltime results))
+	current percentage ov)
+    (while results
+      (let* ((current (pop results))
+	     (ov (make-overlay (car current) (cadr current)))
+	     (current (car (last current)))
+	     (percentage (/ (+ (car current) (nth 2 current))
+			    totaltime))
+	     col benchstr lowface)
+	(setq col
+	      (profile-dotemacs-percentage-color
+	       percentage
+	       (face-background 'default)
+	       (face-background 'profile-dotemacs-time-face)))
+	(setq percentage (round (* 100 percentage)))
+	(setq benchstr (profile-dotemacs-make-benchstr current))
+	(overlay-put ov 'help-echo benchstr)
+	(if (and (numberp profile-dotemacs-low-percentage)
+		 (< percentage profile-dotemacs-low-percentage))
+	    (overlay-put ov 'face 'profile-dotemacs-low-percentage-face)
+	  (overlay-put ov 'before-string
+		       (propertize benchstr
+				   'face 'profile-dotemacs-highlight-face))
+	  (overlay-put ov 'face
+		       `(:background ,col)))))
+    (setq ov (make-overlay (1- (point-max)) (point-max)))
+    (overlay-put ov 'after-string
+		 (propertize
+		  (format "\n-----------------\nTotal time: %.2fs\n"
+			  totaltime)
+		  'face 'profile-dotemacs-highlight-face))))
+
+(defun profile-dotemacs-totaltime (results)
+  "Calculate total time of RESULTS."
+  (let ((totaltime 0))
+    (mapc (lambda (x)
+	    (let ((cur (car (last x))))
+	      (setq totaltime (+ totaltime (car cur) (nth 2 cur)))))
+	  results)
+    totaltime))
+
+(defun profile-dotemacs-percentage-color (percent col-begin col-end)
+  "Calculate color according to PERCENT between COL-BEGIN and COL-END."
+  (let* ((col1 (color-values col-begin))
+	 (col2 (color-values col-end))
+	 (col
+	  (mapcar (lambda (c)
+		    (round
+		     (+ (* (- 1 percent) (nth c col1))
+			(* percent (nth c col2)))))
+		  '(0 1 2))))
+    (format "RGB:%04x/%04x/%04x"
+	    (car col)
+	    (nth 1 col)
+	    (nth 2 col))))
+
+(defun profile-dotemacs-make-benchstr (timings)
+  "Create descriptive benchmark string from TIMINGS."
+  (format
+   (concat
+    "<Percentage: %d ; "
+    "Time: %.2f ; "
+    "Number of GC: %d ; "
+    "Time for GC: %.2f>\n")
+   percentage
+   (car timings) (nth 1 timings) (nth 2 timings)))
+
+
+;; profile-dotemacs.el ends here