lisp/org-plot.el

   1 ;;; org-plot.el --- Support for plotting from Org-mode
   2
   3 ;; Copyright (C) 2008-2013 Free Software Foundation, Inc.
   4 ;;
   5 ;; Author: Eric Schulte <schulte dot eric at gmail dot com>
   6 ;; Keywords: tables, plotting
   7 ;; Homepage: http://orgmode.org
   8 ;;
   9 ;; This file is part of GNU Emacs.
  10 ;;
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Borrows ideas and a couple of lines of code from org-exp.el.
  27
  28 ;; Thanks to the org-mode mailing list for testing and implementation
  29 ;; and feature suggestions
  30
  31 ;;; Code:
  32 (require 'org)
  33 (require 'org-table)
  34 (eval-when-compile
  35   (require 'cl))
  36
  37 (declare-function gnuplot-delchar-or-maybe-eof "ext:gnuplot" (arg))
  38 (declare-function gnuplot-mode "ext:gnuplot" ())
  39 (declare-function gnuplot-send-buffer-to-gnuplot "ext:gnuplot" ())
  40
  41 (defvar org-plot/gnuplot-default-options
  42   '((:plot-type . 2d)
  43     (:with . lines)
  44     (:ind . 0))
  45   "Default options to gnuplot used by `org-plot/gnuplot'.")
  46
  47 (defvar org-plot-timestamp-fmt nil)
  48
  49 (defun org-plot/add-options-to-plist (p options)
  50   "Parse an OPTIONS line and set values in the property list P.
  51 Returns the resulting property list."
  52   (let (o)
  53     (when options
  54       (let ((op '(("type"    . :plot-type)
  55                   ("script"  . :script)
  56                   ("line"    . :line)
  57                   ("set"     . :set)
  58                   ("title"   . :title)
  59                   ("ind"     . :ind)
  60                   ("deps"    . :deps)
  61                   ("with"    . :with)
  62                   ("file"    . :file)
  63                   ("labels"  . :labels)
  64                   ("map"     . :map)
  65                   ("timeind" . :timeind)
  66                   ("timefmt" . :timefmt)))
  67             (multiples '("set" "line"))
  68             (regexp ":\\([\"][^\"]+?[\"]\\|[(][^)]+?[)]\\|[^ \t\n\r;,.]*\\)")
  69             (start 0)
  70             o)
  71         (while (setq o (pop op))
  72           (if (member (car o) multiples) ;; keys with multiple values
  73               (while (string-match
  74                       (concat (regexp-quote (car o)) regexp)
  75                       options start)
  76                 (setq start (match-end 0))
  77                 (setq p (plist-put p (cdr o)
  78                                    (cons (car (read-from-string
  79                                                (match-string 1 options)))
  80                                          (plist-get p (cdr o)))))
  81                 p)
  82             (if (string-match (concat (regexp-quote (car o)) regexp)
  83                               options)
  84                 (setq p (plist-put p (cdr o)
  85                                    (car (read-from-string
  86                                          (match-string 1 options)))))))))))
  87   p)
  88
  89 (defun org-plot/goto-nearest-table ()
  90   "Move the point forward to the beginning of nearest table.
  91 Return value is the point at the beginning of the table."
  92   (interactive) (move-beginning-of-line 1)
  93   (while (not (or (org-at-table-p) (< 0 (forward-line 1)))))
  94   (goto-char (org-table-begin)))
  95
  96 (defun org-plot/collect-options (&optional params)
  97   "Collect options from an org-plot '#+Plot:' line.
  98 Accepts an optional property list PARAMS, to which the options
  99 will be added.  Returns the resulting property list."
 100   (interactive)
 101   (let ((line (thing-at-point 'line)))
 102     (if (string-match "#\\+PLOT: +\\(.*\\)$" line)
 103         (org-plot/add-options-to-plist params (match-string 1 line))
 104       params)))
 105
 106 (defun org-plot-quote-timestamp-field (s)
 107   "Convert field S from timestamp to Unix time and export to gnuplot."
 108   (format-time-string org-plot-timestamp-fmt (org-time-string-to-time s)))
 109
 110 (defun org-plot-quote-tsv-field (s)
 111   "Quote field S for export to gnuplot."
 112   (if (string-match org-table-number-regexp s) s
 113     (if (string-match org-ts-regexp3 s)
 114         (org-plot-quote-timestamp-field s)
 115       (concat "\"" (mapconcat 'identity (split-string s "\"") "\"\"") "\""))))
 116
 117 (defun org-plot/gnuplot-to-data (table data-file params)
 118   "Export TABLE to DATA-FILE in a format readable by gnuplot.
 119 Pass PARAMS through to `orgtbl-to-generic' when exporting TABLE."
 120   (with-temp-file
 121       data-file
 122     (make-local-variable 'org-plot-timestamp-fmt)
 123     (setq org-plot-timestamp-fmt (or
 124                                   (plist-get params :timefmt)
 125                                   "%Y-%m-%d-%H:%M:%S"))
 126     (insert (orgtbl-to-generic
 127              table
 128              (org-combine-plists
 129               '(:sep "\t" :fmt org-plot-quote-tsv-field)
 130               params))))
 131   nil)
 132
 133 (defun org-plot/gnuplot-to-grid-data (table data-file params)
 134   "Export the data in TABLE to DATA-FILE for gnuplot.
 135 This means in a format appropriate for grid plotting by gnuplot.
 136 PARAMS specifies which columns of TABLE should be plotted as independent
 137 and dependant variables."
 138   (interactive)
 139   (let* ((ind (- (plist-get params :ind) 1))
 140          (deps (if (plist-member params :deps)
 141                    (mapcar (lambda (val) (- val 1)) (plist-get params :deps))
 142                  (let (collector)
 143                    (dotimes (col (length (first table)))
 144                      (setf collector (cons col collector)))
 145                    collector)))
 146          (counter 0)
 147          row-vals)
 148     (when (>= ind 0) ;; collect values of ind col
 149       (setf row-vals (mapcar (lambda (row) (setf counter (+ 1 counter))
 150                                (cons counter (nth ind row))) table)))
 151     (when (or deps (>= ind 0)) ;; remove non-plotting columns
 152       (setf deps (delq ind deps))
 153       (setf table (mapcar (lambda (row)
 154                             (dotimes (col (length row))
 155                               (unless (memq col deps)
 156                                 (setf (nth col row) nil)))
 157                             (delq nil row))
 158                           table)))
 159     ;; write table to gnuplot grid datafile format
 160     (with-temp-file data-file
 161       (let ((num-rows (length table)) (num-cols (length (first table)))
 162             (gnuplot-row (lambda (col row value)
 163                            (setf col (+ 1 col)) (setf row (+ 1 row))
 164                            (format "%f  %f  %f\n%f  %f  %f\n"
 165                                    col (- row 0.5) value ;; lower edge
 166                                    col (+ row 0.5) value))) ;; upper edge
 167             front-edge back-edge)
 168         (dotimes (col num-cols)
 169           (dotimes (row num-rows)
 170             (setf back-edge
 171                   (concat back-edge
 172                           (funcall gnuplot-row (- col 1) row
 173                                    (string-to-number (nth col (nth row table))))))
 174             (setf front-edge
 175                   (concat front-edge
 176                           (funcall gnuplot-row col row
 177                                    (string-to-number (nth col (nth row table)))))))
 178           ;; only insert once per row
 179           (insert back-edge) (insert "\n") ;; back edge
 180           (insert front-edge) (insert "\n") ;; front edge
 181           (setf back-edge "") (setf front-edge ""))))
 182     row-vals))
 183
 184 (defun org-plot/gnuplot-script (data-file num-cols params &optional preface)
 185   "Write a gnuplot script to DATA-FILE respecting the options set in PARAMS.
 186 NUM-COLS controls the number of columns plotted in a 2-d plot.
 187 Optional argument PREFACE returns only option parameters in a
 188 manner suitable for prepending to a user-specified script."
 189   (let* ((type (plist-get params :plot-type))
 190          (with (if (equal type 'grid)
 191                    'pm3d
 192                  (plist-get params :with)))
 193          (sets (plist-get params :set))
 194          (lines (plist-get params :line))
 195          (map (plist-get params :map))
 196          (title (plist-get params :title))
 197          (file (plist-get params :file))
 198          (ind (plist-get params :ind))
 199          (time-ind (plist-get params :timeind))
 200          (timefmt (plist-get params :timefmt))
 201          (text-ind (plist-get params :textind))
 202          (deps (if (plist-member params :deps) (plist-get params :deps)))
 203          (col-labels (plist-get params :labels))
 204          (x-labels (plist-get params :xlabels))
 205          (y-labels (plist-get params :ylabels))
 206          (plot-str "'%s' using %s%d%s with %s title '%s'")
 207          (plot-cmd (case type
 208                      ('2d "plot")
 209                      ('3d "splot")
 210                      ('grid "splot")))
 211          (script "reset")
 212                                         ; ats = add-to-script
 213          (ats (lambda (line) (setf script (format "%s\n%s" script line))))
 214          plot-lines)
 215     (when file ;; output file
 216       (funcall ats (format "set term %s" (file-name-extension file)))
 217       (funcall ats (format "set output '%s'" file)))
 218     (case type ;; type
 219       ('2d ())
 220       ('3d (if map (funcall ats "set map")))
 221       ('grid (if map (funcall ats "set pm3d map")
 222                (funcall ats "set pm3d"))))
 223     (when title (funcall ats (format "set title '%s'" title))) ;; title
 224     (when lines (mapc (lambda (el) (funcall ats el)) lines)) ;; line
 225     (when sets ;; set
 226       (mapc (lambda (el) (funcall ats (format "set %s" el))) sets))
 227     (when x-labels ;; x labels (xtics)
 228       (funcall ats
 229                (format "set xtics (%s)"
 230                        (mapconcat (lambda (pair)
 231                                     (format "\"%s\" %d" (cdr pair) (car pair)))
 232                                   x-labels ", "))))
 233     (when y-labels ;; y labels (ytics)
 234       (funcall ats
 235                (format "set ytics (%s)"
 236                        (mapconcat (lambda (pair)
 237                                     (format "\"%s\" %d" (cdr pair) (car pair)))
 238                                   y-labels ", "))))
 239     (when time-ind ;; timestamp index
 240       (funcall ats "set xdata time")
 241       (funcall ats (concat "set timefmt \""
 242                            (or timefmt ;; timefmt passed to gnuplot
 243                                "%Y-%m-%d-%H:%M:%S") "\"")))
 244     (unless preface
 245       (case type ;; plot command
 246         ('2d (dotimes (col num-cols)
 247                (unless (and (equal type '2d)
 248                             (or (and ind (equal (+ 1 col) ind))
 249                                 (and deps (not (member (+ 1 col) deps)))))
 250                  (setf plot-lines
 251                        (cons
 252                         (format plot-str data-file
 253                                 (or (and ind (> ind 0)
 254                                          (not text-ind)
 255                                          (format "%d:" ind)) "")
 256                                 (+ 1 col)
 257                                 (if text-ind (format ":xticlabel(%d)" ind) "")
 258                                 with
 259                                 (or (nth col col-labels) (format "%d" (+ 1 col))))
 260                         plot-lines)))))
 261         ('3d
 262          (setq plot-lines (list (format "'%s' matrix with %s title ''"
 263                                         data-file with))))
 264         ('grid
 265          (setq plot-lines (list (format "'%s' with %s title ''"
 266                                         data-file with)))))
 267       (funcall ats
 268                (concat plot-cmd " " (mapconcat 'identity (reverse plot-lines) ",\\\n    "))))
 269     script))
 270
 271 ;;-----------------------------------------------------------------------------
 272 ;; facade functions
 273 ;;;###autoload
 274 (defun org-plot/gnuplot (&optional params)
 275   "Plot table using gnuplot.  Gnuplot options can be specified with PARAMS.
 276 If not given options will be taken from the +PLOT
 277 line directly before or after the table."
 278   (interactive)
 279   (require 'gnuplot)
 280   (save-window-excursion
 281     (delete-other-windows)
 282     (when (get-buffer "*gnuplot*") ;; reset *gnuplot* if it already running
 283       (with-current-buffer "*gnuplot*"
 284         (goto-char (point-max))
 285         (gnuplot-delchar-or-maybe-eof nil)))
 286     (org-plot/goto-nearest-table)
 287     ;; set default options
 288     (mapc
 289      (lambda (pair)
 290        (unless (plist-member params (car pair))
 291          (setf params (plist-put params (car pair) (cdr pair)))))
 292      org-plot/gnuplot-default-options)
 293     ;; collect table and table information
 294     (let* ((data-file (make-temp-file "org-plot"))
 295            (table (org-table-to-lisp))
 296            (num-cols (length (if (eq (first table) 'hline) (second table)
 297                                (first table)))))
 298       (while (equal 'hline (first table)) (setf table (cdr table)))
 299       (when (equal (second table) 'hline)
 300         (setf params (plist-put params :labels (first table))) ;; headers to labels
 301         (setf table (delq 'hline (cdr table)))) ;; clean non-data from table
 302       ;; collect options
 303       (save-excursion (while (and (equal 0 (forward-line -1))
 304                                   (looking-at "[[:space:]]*#\\+"))
 305                         (setf params (org-plot/collect-options params))))
 306       ;; dump table to datafile (very different for grid)
 307       (case (plist-get params :plot-type)
 308         ('2d   (org-plot/gnuplot-to-data table data-file params))
 309         ('3d   (org-plot/gnuplot-to-data table data-file params))
 310         ('grid (let ((y-labels (org-plot/gnuplot-to-grid-data
 311                                 table data-file params)))
 312                  (when y-labels (plist-put params :ylabels y-labels)))))
 313       ;; check for timestamp ind column
 314       (let ((ind (- (plist-get params :ind) 1)))
 315         (when (and (>= ind 0) (equal '2d (plist-get params :plot-type)))
 316           (if (= (length
 317                   (delq 0 (mapcar
 318                            (lambda (el)
 319                              (if (string-match org-ts-regexp3 el)
 320                                  0 1))
 321                            (mapcar (lambda (row) (nth ind row)) table)))) 0)
 322               (plist-put params :timeind t)
 323             ;; check for text ind column
 324             (if (or (string= (plist-get params :with) "hist")
 325                     (> (length
 326                         (delq 0 (mapcar
 327                                  (lambda (el)
 328                                    (if (string-match org-table-number-regexp el)
 329                                        0 1))
 330                                  (mapcar (lambda (row) (nth ind row)) table)))) 0))
 331                 (plist-put params :textind t)))))
 332       ;; write script
 333       (with-temp-buffer
 334         (if (plist-get params :script) ;; user script
 335             (progn (insert
 336                     (org-plot/gnuplot-script data-file num-cols params t))
 337                    (insert "\n")
 338                    (insert-file-contents (plist-get params :script))
 339                    (goto-char (point-min))
 340                    (while (re-search-forward "$datafile" nil t)
 341                      (replace-match data-file nil nil)))
 342           (insert
 343            (org-plot/gnuplot-script data-file num-cols params)))
 344         ;; graph table
 345         (gnuplot-mode)
 346         (gnuplot-send-buffer-to-gnuplot))
 347       ;; cleanup
 348       (bury-buffer (get-buffer "*gnuplot*"))
 349       (run-with-idle-timer 0.1 nil (lambda () (delete-file data-file))))))
 350
 351 (provide 'org-plot)
 352
 353 ;; Local variables:
 354 ;; generated-autoload-file: "org-loaddefs.el"
 355 ;; End:
 356
 357 ;;; org-plot.el ends here