lisp/ob-gnuplot.el

   1 ;;; ob-gnuplot.el --- org-babel functions for gnuplot evaluation
   2
   3 ;; Copyright (C) 2009-2011  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 (require 'ob-ref)
  43 (require 'ob-comint)
  44 (eval-when-compile (require 'cl))
  45
  46 (declare-function org-time-string-to-time "org" (s))
  47 (declare-function org-combine-plists "org" (&rest plists))
  48 (declare-function orgtbl-to-generic "org-table" (table params))
  49 (declare-function gnuplot-mode "ext:gnuplot-mode" ())
  50 (declare-function gnuplot-send-string-to-gnuplot "ext:gnuplot-mode" (str txt))
  51 (declare-function gnuplot-send-buffer-to-gnuplot "ext:gnuplot-mode" ())
  52
  53 (defvar org-babel-default-header-args:gnuplot
  54   '((:results . "file") (:exports . "results") (:session . nil))
  55   "Default arguments to use when evaluating a gnuplot source block.")
  56
  57 (defvar org-babel-gnuplot-timestamp-fmt nil)
  58
  59 (defun org-babel-gnuplot-process-vars (params)
  60   "Extract variables from PARAMS and process the variables.
  61 Dumps all vectors into files and returns an association list
  62 of variable names and the related value to be used in the gnuplot
  63 code."
  64   (mapcar
  65    (lambda (pair)
  66      (cons
  67       (car pair) ;; variable name
  68       (if (listp (cdr pair)) ;; variable value
  69           (org-babel-gnuplot-table-to-data
  70            (cdr pair) (org-babel-temp-file "gnuplot-") params)
  71         (cdr pair))))
  72    (mapcar #'cdr (org-babel-get-header params :var))))
  73
  74 (defun org-babel-expand-body:gnuplot (body params)
  75   "Expand BODY according to PARAMS, return the expanded body."
  76   (save-window-excursion
  77     (let* ((vars (org-babel-gnuplot-process-vars params))
  78            (out-file (cdr (assoc :file params)))
  79            (term (or (cdr (assoc :term params))
  80                      (when out-file (file-name-extension out-file))))
  81            (cmdline (cdr (assoc :cmdline params)))
  82            (title (plist-get params :title))
  83            (lines (plist-get params :line))
  84            (sets (plist-get params :set))
  85            (x-labels (plist-get params :xlabels))
  86            (y-labels (plist-get params :ylabels))
  87            (timefmt (plist-get params :timefmt))
  88            (time-ind (or (plist-get params :timeind)
  89                          (when timefmt 1)))
  90            output)
  91       (flet ((add-to-body (text)
  92                           (setq body (concat text "\n" body))))
  93         ;; append header argument settings to body
  94         (when title (add-to-body (format "set title '%s'" title))) ;; title
  95         (when lines (mapc (lambda (el) (add-to-body el)) lines)) ;; line
  96         (when sets
  97           (mapc (lambda (el) (add-to-body (format "set %s" el))) sets))
  98         (when x-labels
  99           (add-to-body
 100            (format "set xtics (%s)"
 101                    (mapconcat (lambda (pair)
 102                                 (format "\"%s\" %d" (cdr pair) (car pair)))
 103                               x-labels ", "))))
 104         (when y-labels
 105           (add-to-body
 106            (format "set ytics (%s)"
 107                    (mapconcat (lambda (pair)
 108                                 (format "\"%s\" %d" (cdr pair) (car pair)))
 109                               y-labels ", "))))
 110         (when time-ind
 111           (add-to-body "set xdata time")
 112           (add-to-body (concat "set timefmt \""
 113                                (or timefmt
 114                                    "%Y-%m-%d-%H:%M:%S") "\"")))
 115         (when out-file (add-to-body (format "set output \"%s\"" out-file)))
 116         (when term (add-to-body (format "set term %s" term)))
 117         ;; insert variables into code body: this should happen last
 118         ;; placing the variables at the *top* of the code in case their
 119         ;; values are used later
 120         (add-to-body (mapconcat #'identity
 121                                 (org-babel-variable-assignments:gnuplot params)
 122                                 "\n"))
 123         ;; replace any variable names preceded by '$' with the actual
 124         ;; value of the variable
 125         (mapc (lambda (pair)
 126                 (setq body (replace-regexp-in-string
 127                             (format "\\$%s" (car pair)) (cdr pair) body)))
 128               vars))
 129       body)))
 130
 131 (defun org-babel-execute:gnuplot (body params)
 132   "Execute a block of Gnuplot code.
 133 This function is called by `org-babel-execute-src-block'."
 134   (require 'gnuplot)
 135   (let ((session (cdr (assoc :session params)))
 136         (result-type (cdr (assoc :results params)))
 137         (out-file (cdr (assoc :file params)))
 138         (body (org-babel-expand-body:gnuplot body params))
 139         output)
 140     (save-window-excursion
 141       ;; evaluate the code body with gnuplot
 142       (if (string= session "none")
 143           (let ((script-file (org-babel-temp-file "gnuplot-script-")))
 144             (with-temp-file script-file
 145               (insert (concat body "\n")))
 146             (message "gnuplot \"%s\"" script-file)
 147             (setq output
 148                   (shell-command-to-string
 149                    (format
 150                     "gnuplot \"%s\""
 151                     (org-babel-process-file-name
 152                      script-file
 153                      (if (member system-type '(cygwin windows-nt ms-dos))
 154                          t nil)))))
 155             (message output))
 156         (with-temp-buffer
 157           (insert (concat body "\n"))
 158           (gnuplot-mode)
 159           (gnuplot-send-buffer-to-gnuplot)))
 160       (if (member "output" (split-string result-type))
 161           output
 162         nil)))) ;; signal that output has already been written to file
 163
 164 (defun org-babel-prep-session:gnuplot (session params)
 165   "Prepare SESSION according to the header arguments in PARAMS."
 166   (let* ((session (org-babel-gnuplot-initiate-session session))
 167          (var-lines (org-babel-variable-assignments:gnuplot params)))
 168     (message "%S" session)
 169     (org-babel-comint-in-buffer session
 170       (mapc (lambda (var-line)
 171               (insert var-line) (comint-send-input nil t)
 172               (org-babel-comint-wait-for-output session)
 173               (sit-for .1) (goto-char (point-max))) var-lines))
 174     session))
 175
 176 (defun org-babel-load-session:gnuplot (session body params)
 177   "Load BODY into SESSION."
 178   (save-window-excursion
 179     (let ((buffer (org-babel-prep-session:gnuplot session params)))
 180       (with-current-buffer buffer
 181         (goto-char (process-mark (get-buffer-process (current-buffer))))
 182         (insert (org-babel-chomp body)))
 183       buffer)))
 184
 185 (defun org-babel-variable-assignments:gnuplot (params)
 186   "Return list of gnuplot statements assigning the block's variables"
 187   (mapcar
 188    (lambda (pair) (format "%s = \"%s\"" (car pair) (cdr pair)))
 189    (org-babel-gnuplot-process-vars params)))
 190
 191 (defvar gnuplot-buffer)
 192 (defun org-babel-gnuplot-initiate-session (&optional session params)
 193   "Initiate a gnuplot session.
 194 If there is not a current inferior-process-buffer in SESSION
 195 then create one.  Return the initialized session.  The current
 196 `gnuplot-mode' doesn't provide support for multiple sessions."
 197   (require 'gnuplot)
 198   (unless (string= session "none")
 199     (save-window-excursion
 200       (gnuplot-send-string-to-gnuplot "" "line")
 201       gnuplot-buffer)))
 202
 203 (defun org-babel-gnuplot-quote-timestamp-field (s)
 204   "Convert S from timestamp to Unix time and export to gnuplot."
 205   (format-time-string org-babel-gnuplot-timestamp-fmt (org-time-string-to-time s)))
 206
 207 (defvar org-table-number-regexp)
 208 (defvar org-ts-regexp3)
 209 (defun org-babel-gnuplot-quote-tsv-field (s)
 210   "Quote S for export to gnuplot."
 211   (unless (stringp s)
 212     (setq s (format "%s" s)))
 213   (if (string-match org-table-number-regexp s) s
 214     (if (string-match org-ts-regexp3 s)
 215         (org-babel-gnuplot-quote-timestamp-field s)
 216       (concat "\"" (mapconcat 'identity (split-string s "\"") "\"\"") "\""))))
 217
 218 (defun org-babel-gnuplot-table-to-data (table data-file params)
 219   "Export TABLE to DATA-FILE in a format readable by gnuplot.
 220 Pass PARAMS through to `orgtbl-to-generic' when exporting TABLE."
 221   (with-temp-file data-file
 222     (make-local-variable 'org-babel-gnuplot-timestamp-fmt)
 223     (setq org-babel-gnuplot-timestamp-fmt (or
 224                                            (plist-get params :timefmt)
 225                                            "%Y-%m-%d-%H:%M:%S"))
 226     (insert (orgtbl-to-generic
 227              table
 228              (org-combine-plists
 229               '(:sep "\t" :fmt org-babel-gnuplot-quote-tsv-field)
 230               params))))
 231   data-file)
 232
 233 (provide 'ob-gnuplot)
 234
 235
 236
 237 ;;; ob-gnuplot.el ends here