lisp/ob-gnuplot.el

   1 ;;; ob-gnuplot.el --- org-babel functions for gnuplot evaluation
   2
   3 ;; Copyright (C) 2009-2014 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   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 ;; Org-Babel support for evaluating gnuplot source code.
  27 ;;
  28 ;; This differs from most standard languages in that
  29 ;;
  30 ;; 1) we are generally only going to return results of type "file"
  31 ;;
  32 ;; 2) we are adding the "file" and "cmdline" header arguments
  33
  34 ;;; Requirements:
  35
  36 ;; - gnuplot :: http://www.gnuplot.info/
  37 ;;
  38 ;; - gnuplot-mode :: http://cars9.uchicago.edu/~ravel/software/gnuplot-mode.html
  39
  40 ;;; Code:
  41 (require 'ob)
  42 (eval-when-compile (require 'cl))
  43
  44 (declare-function org-time-string-to-time "org" (s))
  45 (declare-function org-combine-plists "org" (&rest plists))
  46 (declare-function orgtbl-to-generic "org-table" (table params))
  47 (declare-function gnuplot-mode "ext:gnuplot-mode" ())
  48 (declare-function gnuplot-send-string-to-gnuplot "ext:gnuplot-mode" (str txt))
  49 (declare-function gnuplot-send-buffer-to-gnuplot "ext:gnuplot-mode" ())
  50
  51 (defvar org-babel-default-header-args:gnuplot
  52   '((:results . "file") (:exports . "results") (:session . nil))
  53   "Default arguments to use when evaluating a gnuplot source block.")
  54
  55 (defvar org-babel-header-args:gnuplot
  56   '((title      . :any)
  57     (lines      . :any)
  58     (sets       . :any)
  59     (x-labels   . :any)
  60     (y-labels   . :any)
  61     (timefmt    . :any)
  62     (time-ind   . :any)
  63     (missing    . :any)
  64     (term       . :any))
  65   "Gnuplot specific header args.")
  66
  67 (defvar org-babel-gnuplot-timestamp-fmt nil)
  68
  69 (defvar *org-babel-gnuplot-missing* nil)
  70
  71 (defcustom *org-babel-gnuplot-terms*
  72   '((eps . "postscript eps"))
  73   "List of file extensions and the associated gnuplot terminal."
  74   :group 'org-babel
  75   :type '(repeat (cons (symbol :tag "File extension")
  76                        (string :tag "Gnuplot terminal"))))
  77
  78 (defun org-babel-gnuplot-process-vars (params)
  79   "Extract variables from PARAMS and process the variables.
  80 Dumps all vectors into files and returns an association list
  81 of variable names and the related value to be used in the gnuplot
  82 code."
  83   (let ((*org-babel-gnuplot-missing* (cdr (assoc :missing params))))
  84     (mapcar
  85      (lambda (pair)
  86        (cons
  87         (car pair) ;; variable name
  88         (let* ((val (cdr pair)) ;; variable value
  89                (lp  (listp val)))
  90           (if lp
  91               (org-babel-gnuplot-table-to-data
  92                (let* ((first  (car val))
  93                       (tablep (or (listp first) (symbolp first))))
  94                  (if tablep val (mapcar 'list val)))
  95                (org-babel-temp-file "gnuplot-") params)
  96           val))))
  97      (mapcar #'cdr (org-babel-get-header params :var)))))
  98
  99 (defun org-babel-expand-body:gnuplot (body params)
 100   "Expand BODY according to PARAMS, return the expanded body."
 101   (save-window-excursion
 102     (let* ((vars (org-babel-gnuplot-process-vars params))
 103            (out-file (cdr (assoc :file params)))
 104            (prologue (cdr (assoc :prologue params)))
 105            (epilogue (cdr (assoc :epilogue params)))
 106            (term (or (cdr (assoc :term params))
 107                      (when out-file
 108                        (let ((ext (file-name-extension out-file)))
 109                          (or (cdr (assoc (intern (downcase ext))
 110                                          *org-babel-gnuplot-terms*))
 111                              ext)))))
 112            (cmdline (cdr (assoc :cmdline params)))
 113            (title (cdr (assoc :title params)))
 114            (lines (cdr (assoc :line params)))
 115            (sets (cdr (assoc :set params)))
 116            (x-labels (cdr (assoc :xlabels params)))
 117            (y-labels (cdr (assoc :ylabels params)))
 118            (timefmt (cdr (assoc :timefmt params)))
 119            (time-ind (or (cdr (assoc :timeind params))
 120                          (when timefmt 1)))
 121            (missing (cdr (assoc :missing params)))
 122            (add-to-body (lambda (text) (setq body (concat text "\n" body))))
 123            output)
 124       ;; append header argument settings to body
 125       (when title (funcall add-to-body (format "set title '%s'" title)))
 126       (when lines (mapc (lambda (el) (funcall add-to-body el)) lines))
 127       (when missing
 128         (funcall add-to-body (format "set datafile missing '%s'" missing)))
 129       (when sets
 130         (mapc (lambda (el) (funcall add-to-body (format "set %s" el))) sets))
 131       (when x-labels
 132         (funcall add-to-body
 133                  (format "set xtics (%s)"
 134                          (mapconcat (lambda (pair)
 135                                       (format "\"%s\" %d"
 136                                               (cdr pair) (car pair)))
 137                                     x-labels ", "))))
 138       (when y-labels
 139         (funcall add-to-body
 140                  (format "set ytics (%s)"
 141                          (mapconcat (lambda (pair)
 142                                       (format "\"%s\" %d"
 143                                               (cdr pair) (car pair)))
 144                                     y-labels ", "))))
 145       (when time-ind
 146         (funcall add-to-body "set xdata time")
 147         (funcall add-to-body (concat "set timefmt \""
 148                                      (or timefmt
 149                                          "%Y-%m-%d-%H:%M:%S") "\"")))
 150       (when out-file
 151         ;; set the terminal at the top of the block
 152         (funcall add-to-body (format "set output \"%s\"" out-file))
 153         ;; and close the terminal at the bottom of the block
 154         (setq body (concat body "\nset output\n")))
 155       (when term (funcall add-to-body (format "set term %s" term)))
 156       ;; insert variables into code body: this should happen last
 157       ;; placing the variables at the *top* of the code in case their
 158       ;; values are used later
 159       (funcall add-to-body
 160                (mapconcat #'identity
 161                           (org-babel-variable-assignments:gnuplot params)
 162                           "\n"))
 163       ;; replace any variable names preceded by '$' with the actual
 164       ;; value of the variable
 165       (mapc (lambda (pair)
 166               (setq body (replace-regexp-in-string
 167                           (format "\\$%s" (car pair)) (cdr pair) body)))
 168             vars)
 169       (when prologue (funcall add-to-body prologue))
 170       (when epilogue (setq body (concat body "\n" epilogue))))
 171     body))
 172
 173 (defun org-babel-execute:gnuplot (body params)
 174   "Execute a block of Gnuplot code.
 175 This function is called by `org-babel-execute-src-block'."
 176   (require 'gnuplot)
 177   (let ((session (cdr (assoc :session params)))
 178         (result-type (cdr (assoc :results params)))
 179         (out-file (cdr (assoc :file params)))
 180         (body (org-babel-expand-body:gnuplot body params))
 181         output)
 182     (save-window-excursion
 183       ;; evaluate the code body with gnuplot
 184       (if (string= session "none")
 185           (let ((script-file (org-babel-temp-file "gnuplot-script-")))
 186             (with-temp-file script-file
 187               (insert (concat body "\n")))
 188             (message "gnuplot \"%s\"" script-file)
 189             (setq output
 190                   (shell-command-to-string
 191                    (format
 192                     "gnuplot \"%s\""
 193                     (org-babel-process-file-name
 194                      script-file
 195                      (if (member system-type '(cygwin windows-nt ms-dos))
 196                          t nil)))))
 197             (message output))
 198         (with-temp-buffer
 199           (insert (concat body "\n"))
 200           (gnuplot-mode)
 201           (gnuplot-send-buffer-to-gnuplot)))
 202       (if (member "output" (split-string result-type))
 203           output
 204         nil)))) ;; signal that output has already been written to file
 205
 206 (defun org-babel-prep-session:gnuplot (session params)
 207   "Prepare SESSION according to the header arguments in PARAMS."
 208   (let* ((session (org-babel-gnuplot-initiate-session session))
 209          (var-lines (org-babel-variable-assignments:gnuplot params)))
 210     (message "%S" session)
 211     (org-babel-comint-in-buffer session
 212       (mapc (lambda (var-line)
 213               (insert var-line) (comint-send-input nil t)
 214               (org-babel-comint-wait-for-output session)
 215               (sit-for .1) (goto-char (point-max))) var-lines))
 216     session))
 217
 218 (defun org-babel-load-session:gnuplot (session body params)
 219   "Load BODY into SESSION."
 220   (save-window-excursion
 221     (let ((buffer (org-babel-prep-session:gnuplot session params)))
 222       (with-current-buffer buffer
 223         (goto-char (process-mark (get-buffer-process (current-buffer))))
 224         (insert (org-babel-chomp body)))
 225       buffer)))
 226
 227 (defun org-babel-variable-assignments:gnuplot (params)
 228   "Return list of gnuplot statements assigning the block's variables."
 229   (mapcar
 230    (lambda (pair) (format "%s = \"%s\"" (car pair) (cdr pair)))
 231    (org-babel-gnuplot-process-vars params)))
 232
 233 (defvar gnuplot-buffer)
 234 (defun org-babel-gnuplot-initiate-session (&optional session params)
 235   "Initiate a gnuplot session.
 236 If there is not a current inferior-process-buffer in SESSION
 237 then create one.  Return the initialized session.  The current
 238 `gnuplot-mode' doesn't provide support for multiple sessions."
 239   (require 'gnuplot)
 240   (unless (string= session "none")
 241     (save-window-excursion
 242       (gnuplot-send-string-to-gnuplot "" "line")
 243       gnuplot-buffer)))
 244
 245 (defun org-babel-gnuplot-quote-timestamp-field (s)
 246   "Convert S from timestamp to Unix time and export to gnuplot."
 247   (format-time-string org-babel-gnuplot-timestamp-fmt
 248                       (org-time-string-to-time s)))
 249
 250 (defvar org-table-number-regexp)
 251 (defvar org-ts-regexp3)
 252 (defun org-babel-gnuplot-quote-tsv-field (s)
 253   "Quote S for export to gnuplot."
 254   (unless (stringp s)
 255     (setq s (format "%s" s)))
 256   (if (string-match org-table-number-regexp s) s
 257     (if (string-match org-ts-regexp3 s)
 258         (org-babel-gnuplot-quote-timestamp-field s)
 259       (if (zerop (length s))
 260           (or *org-babel-gnuplot-missing* s)
 261         (if (string-match "[ \"]" s)
 262             (concat "\"" (mapconcat 'identity (split-string s "\"") "\"\"")
 263                     "\"")
 264           s)))))
 265
 266 (defun org-babel-gnuplot-table-to-data (table data-file params)
 267   "Export TABLE to DATA-FILE in a format readable by gnuplot.
 268 Pass PARAMS through to `orgtbl-to-generic' when exporting TABLE."
 269   (with-temp-file data-file
 270     (make-local-variable 'org-babel-gnuplot-timestamp-fmt)
 271     (setq org-babel-gnuplot-timestamp-fmt (or
 272                                            (plist-get params :timefmt)
 273                                            "%Y-%m-%d-%H:%M:%S"))
 274     (insert (orgtbl-to-generic
 275              table
 276              (org-combine-plists
 277               '(:sep "\t" :fmt org-babel-gnuplot-quote-tsv-field)
 278               params))))
 279   data-file)
 280
 281 (provide 'ob-gnuplot)
 282
 283
 284
 285 ;;; ob-gnuplot.el ends here