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+;;; org-plot.el --- Support for plotting from Org-mode
+
+;; Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
+;;
+;; Author: Eric Schulte <schulte dot eric at gmail dot com>
+;; Keywords: tables, plotting
+;; Homepage: http://orgmode.org
+;; Version: 7.4
+;;
+;; This file is part of GNU Emacs.
+;;
+;; GNU Emacs 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 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Borrows ideas and a couple of lines of code from org-exp.el.
+
+;; Thanks to the org-mode mailing list for testing and implementation
+;; and feature suggestions
+
+;;; Code:
+(require 'org)
+(require 'org-exp)
+(require 'org-table)
+(eval-when-compile
+  (require 'cl))
+
+(declare-function gnuplot-delchar-or-maybe-eof "ext:gnuplot" (arg))
+(declare-function gnuplot-mode "ext:gnuplot" ())
+(declare-function gnuplot-send-buffer-to-gnuplot "ext:gnuplot" ())
+
+(defvar org-plot/gnuplot-default-options
+  '((:plot-type . 2d)
+    (:with . lines)
+    (:ind . 0))
+  "Default options to gnuplot used by `org-plot/gnuplot'.")
+
+(defvar org-plot-timestamp-fmt nil)
+
+(defun org-plot/add-options-to-plist (p options)
+  "Parse an OPTIONS line and set values in the property list P.
+Returns the resulting property list."
+  (let (o)
+    (when options
+      (let ((op '(("type"    . :plot-type)
+		  ("script"  . :script)
+		  ("line"    . :line)
+		  ("set"     . :set)
+		  ("title"   . :title)
+		  ("ind"     . :ind)
+		  ("deps"    . :deps)
+		  ("with"    . :with)
+		  ("file"    . :file)
+		  ("labels"  . :labels)
+		  ("map"     . :map)
+                  ("timeind" . :timeind)
+		  ("timefmt" . :timefmt)))
+	    (multiples '("set" "line"))
+	    (regexp ":\\([\"][^\"]+?[\"]\\|[(][^)]+?[)]\\|[^ \t\n\r;,.]*\\)")
+	    (start 0)
+	    o)
+	(while (setq o (pop op))
+	  (if (member (car o) multiples) ;; keys with multiple values
+	      (while (string-match
+		      (concat (regexp-quote (car o)) regexp)
+		      options start)
+		(setq start (match-end 0))
+		(setq p (plist-put p (cdr o)
+				   (cons (car (read-from-string
+					       (match-string 1 options)))
+					 (plist-get p (cdr o)))))
+		p)
+	    (if (string-match (concat (regexp-quote (car o)) regexp)
+			      options)
+		(setq p (plist-put p (cdr o)
+				   (car (read-from-string
+					 (match-string 1 options)))))))))))
+  p)
+
+(defun org-plot/goto-nearest-table ()
+  "Move the point forward to the beginning of nearest table.
+Return value is the point at the beginning of the table."
+  (interactive) (move-beginning-of-line 1)
+  (while (not (or (org-at-table-p) (< 0 (forward-line 1)))))
+  (goto-char (org-table-begin)))
+
+(defun org-plot/collect-options (&optional params)
+  "Collect options from an org-plot '#+Plot:' line.
+Accepts an optional property list PARAMS, to which the options
+will be added.  Returns the resulting property list."
+  (interactive)
+  (let ((line (thing-at-point 'line)))
+    (if (string-match "#\\+PLOT: +\\(.*\\)$" line)
+	(org-plot/add-options-to-plist params (match-string 1 line))
+      params)))
+
+(defun org-plot-quote-timestamp-field (s)
+  "Convert field S from timestamp to Unix time and export to gnuplot."
+  (format-time-string org-plot-timestamp-fmt (org-time-string-to-time s)))
+
+(defun org-plot-quote-tsv-field (s)
+  "Quote field S for export to gnuplot."
+  (if (string-match org-table-number-regexp s) s
+    (if (string-match org-ts-regexp3 s)
+	(org-plot-quote-timestamp-field s)
+      (concat "\"" (mapconcat 'identity (split-string s "\"") "\"\"") "\""))))
+
+(defun org-plot/gnuplot-to-data (table data-file params)
+  "Export TABLE to DATA-FILE in a format readable by gnuplot.
+Pass PARAMS through to `orgtbl-to-generic' when exporting TABLE."
+  (with-temp-file
+      data-file
+    (make-local-variable 'org-plot-timestamp-fmt)
+    (setq org-plot-timestamp-fmt (or
+				  (plist-get params :timefmt)
+				  "%Y-%m-%d-%H:%M:%S"))
+    (insert (orgtbl-to-generic
+	     table
+	     (org-combine-plists
+	      '(:sep "\t" :fmt org-plot-quote-tsv-field)
+	      params))))
+  nil)
+
+(defun org-plot/gnuplot-to-grid-data (table data-file params)
+  "Export the data in TABLE to DATA-FILE for gnuplot.
+This means in a format appropriate for grid plotting by gnuplot.
+PARAMS specifies which columns of TABLE should be plotted as independent
+and dependant variables."
+  (interactive)
+  (let* ((ind (- (plist-get params :ind) 1))
+	 (deps (if (plist-member params :deps)
+		   (mapcar (lambda (val) (- val 1)) (plist-get params :deps))
+		 (let (collector)
+		   (dotimes (col (length (first table)))
+		     (setf collector (cons col collector)))
+		   collector)))
+	 row-vals (counter 0))
+    (when (>= ind 0) ;; collect values of ind col
+      (setf row-vals (mapcar (lambda (row) (setf counter (+ 1 counter))
+			       (cons counter (nth ind row))) table)))
+    (when (or deps (>= ind 0)) ;; remove non-plotting columns
+      (setf deps (delq ind deps))
+      (setf table (mapcar (lambda (row)
+			    (dotimes (col (length row))
+			      (unless (memq col deps)
+				(setf (nth col row) nil)))
+			    (delq nil row))
+			  table)))
+    ;; write table to gnuplot grid datafile format
+    (with-temp-file data-file
+      (let ((num-rows (length table)) (num-cols (length (first table)))
+	    front-edge back-edge)
+	(flet ((gnuplot-row (col row value)
+			    (setf col (+ 1 col)) (setf row (+ 1 row))
+			    (format "%f  %f  %f\n%f  %f  %f\n"
+				    col (- row 0.5) value ;; lower edge
+				    col (+ row 0.5) value))) ;; upper edge
+	  (dotimes (col num-cols)
+	    (dotimes (row num-rows)
+	      (setf back-edge
+		    (concat back-edge
+			    (gnuplot-row (- col 1) row (string-to-number
+							(nth col (nth row table))))))
+	      (setf front-edge
+		    (concat front-edge
+			    (gnuplot-row col row (string-to-number
+						  (nth col (nth row table)))))))
+	    ;; only insert once per row
+	    (insert back-edge) (insert "\n") ;; back edge
+	    (insert front-edge) (insert "\n") ;; front edge
+	    (setf back-edge "") (setf front-edge "")))))
+    row-vals))
+
+(defun org-plot/gnuplot-script (data-file num-cols params &optional preface)
+  "Write a gnuplot script to DATA-FILE respecting the options set in PARAMS.
+NUM-COLS controls the number of columns plotted in a 2-d plot.
+Optional argument PREFACE returns only option parameters in a
+manner suitable for prepending to a user-specified script."
+  (let* ((type (plist-get params :plot-type))
+	 (with (if (equal type 'grid)
+		   'pm3d
+		 (plist-get params :with)))
+	 (sets (plist-get params :set))
+	 (lines (plist-get params :line))
+	 (map (plist-get params :map))
+	 (title (plist-get params :title))
+	 (file (plist-get params :file))
+	 (ind (plist-get params :ind))
+	 (time-ind (plist-get params :timeind))
+	 (timefmt (plist-get params :timefmt))
+	 (text-ind (plist-get params :textind))
+	 (deps (if (plist-member params :deps) (plist-get params :deps)))
+	 (col-labels (plist-get params :labels))
+	 (x-labels (plist-get params :xlabels))
+	 (y-labels (plist-get params :ylabels))
+	 (plot-str "'%s' using %s%d%s with %s title '%s'")
+	 (plot-cmd (case type
+		     ('2d "plot")
+		     ('3d "splot")
+		     ('grid "splot")))
+	 (script "reset") plot-lines)
+    (flet ((add-to-script (line) (setf script (format "%s\n%s" script line))))
+      (when file ;; output file
+	(add-to-script (format "set term %s" (file-name-extension file)))
+	(add-to-script (format "set output '%s'" file)))
+      (case type ;; type
+	('2d ())
+	('3d (if map (add-to-script "set map")))
+	('grid (if map
+		   (add-to-script "set pm3d map")
+		 (add-to-script "set pm3d"))))
+      (when title (add-to-script (format "set title '%s'" title))) ;; title
+      (when lines (mapc (lambda (el) (add-to-script el)) lines)) ;; line
+      (when sets ;; set
+	(mapc (lambda (el) (add-to-script (format "set %s" el))) sets))
+      (when x-labels ;; x labels (xtics)
+	(add-to-script
+	 (format "set xtics (%s)"
+		 (mapconcat (lambda (pair)
+			      (format "\"%s\" %d" (cdr pair) (car pair)))
+			    x-labels ", "))))
+      (when y-labels ;; y labels (ytics)
+	(add-to-script
+	 (format "set ytics (%s)"
+		 (mapconcat (lambda (pair)
+			      (format "\"%s\" %d" (cdr pair) (car pair)))
+			    y-labels ", "))))
+      (when time-ind ;; timestamp index
+	(add-to-script "set xdata time")
+	(add-to-script (concat "set timefmt \""
+			       (or timefmt ;; timefmt passed to gnuplot
+				   "%Y-%m-%d-%H:%M:%S") "\"")))
+      (unless preface
+        (case type ;; plot command
+	('2d (dotimes (col num-cols)
+	       (unless (and (equal type '2d)
+			    (or (and ind (equal (+ 1 col) ind))
+				(and deps (not (member (+ 1 col) deps)))))
+		 (setf plot-lines
+		       (cons
+			(format plot-str data-file
+				(or (and ind (> ind 0)
+                                         (not text-ind)
+                                         (format "%d:" ind)) "")
+				(+ 1 col)
+				(if text-ind (format ":xticlabel(%d)" ind) "")
+				with
+				(or (nth col col-labels) (format "%d" (+ 1 col))))
+			plot-lines)))))
+	('3d
+	 (setq plot-lines (list (format "'%s' matrix with %s title ''"
+					data-file with))))
+	('grid
+	 (setq plot-lines (list (format "'%s' with %s title ''"
+					data-file with)))))
+        (add-to-script
+         (concat plot-cmd " " (mapconcat 'identity (reverse plot-lines) ",\\\n    "))))
+      script)))
+
+;;-----------------------------------------------------------------------------
+;; facade functions
+;;;###autoload
+(defun org-plot/gnuplot (&optional params)
+  "Plot table using gnuplot.  Gnuplot options can be specified with PARAMS.
+If not given options will be taken from the +PLOT
+line directly before or after the table."
+  (interactive)
+  (require 'gnuplot)
+  (save-window-excursion
+    (delete-other-windows)
+    (when (get-buffer "*gnuplot*") ;; reset *gnuplot* if it already running
+      (with-current-buffer "*gnuplot*"
+	(goto-char (point-max))
+	(gnuplot-delchar-or-maybe-eof nil)))
+    (org-plot/goto-nearest-table)
+    ;; set default options
+    (mapc
+     (lambda (pair)
+       (unless (plist-member params (car pair))
+	 (setf params (plist-put params (car pair) (cdr pair)))))
+     org-plot/gnuplot-default-options)
+    ;; collect table and table information
+    (let* ((data-file (make-temp-file "org-plot"))
+	   (table (org-table-to-lisp))
+	   (num-cols (length (if (eq (first table) 'hline) (second table)
+			       (first table)))))
+      (while (equal 'hline (first table)) (setf table (cdr table)))
+      (when (equal (second table) 'hline)
+	(setf params (plist-put params :labels (first table))) ;; headers to labels
+	(setf table (delq 'hline (cdr table)))) ;; clean non-data from table
+      ;; collect options
+      (save-excursion (while (and (equal 0 (forward-line -1))
+				  (looking-at "[[:space:]]*#\\+"))
+			(setf params (org-plot/collect-options params))))
+      ;; dump table to datafile (very different for grid)
+      (case (plist-get params :plot-type)
+	('2d   (org-plot/gnuplot-to-data table data-file params))
+	('3d   (org-plot/gnuplot-to-data table data-file params))
+	('grid (let ((y-labels (org-plot/gnuplot-to-grid-data
+				table data-file params)))
+		 (when y-labels (plist-put params :ylabels y-labels)))))
+      ;; check for timestamp ind column
+      (let ((ind (- (plist-get params :ind) 1)))
+	(when (and (>= ind 0) (equal '2d (plist-get params :plot-type)))
+	  (if (= (length
+		  (delq 0 (mapcar
+			   (lambda (el)
+			     (if (string-match org-ts-regexp3 el)
+				 0 1))
+			   (mapcar (lambda (row) (nth ind row)) table)))) 0)
+	      (plist-put params :timeind t)
+	    ;; check for text ind column
+	    (if (or (string= (plist-get params :with) "hist")
+		    (> (length
+			(delq 0 (mapcar
+				 (lambda (el)
+				   (if (string-match org-table-number-regexp el)
+				       0 1))
+				 (mapcar (lambda (row) (nth ind row)) table)))) 0))
+		(plist-put params :textind t)))))
+      ;; write script
+      (with-temp-buffer
+	(if (plist-get params :script) ;; user script
+	    (progn (insert
+                    (org-plot/gnuplot-script data-file num-cols params t))
+                   (insert "\n")
+                   (insert-file-contents (plist-get params :script))
+                   (goto-char (point-min))
+                   (while (re-search-forward "$datafile" nil t)
+                     (replace-match data-file nil nil)))
+	  (insert
+	   (org-plot/gnuplot-script data-file num-cols params)))
+	;; graph table
+	(gnuplot-mode)
+	(gnuplot-send-buffer-to-gnuplot))
+      ;; cleanup
+      (bury-buffer (get-buffer "*gnuplot*"))
+      (run-with-idle-timer 0.1 nil (lambda () (delete-file data-file))))))
+
+(provide 'org-plot)
+
+;; arch-tag: 5763f7c6-0c75-416d-b070-398ee4ec0eca
+;;; org-plot.el ends here