;;; ob-gnuplot.el --- Babel Functions for Gnuplot -*- lexical-binding: t; -*-
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;; Copyright (C) 2009-2018 Free Software Foundation, Inc.
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research
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;; Homepage: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Org-Babel support for evaluating gnuplot source code.
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;;
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;; This differs from most standard languages in that
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;;
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;; 1) we are generally only going to return results of type "file"
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;;
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;; 2) we are adding the "file" and "cmdline" header arguments
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;;; Requirements:
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;; - gnuplot :: http://www.gnuplot.info/
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;;
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;; - gnuplot-mode :: http://cars9.uchicago.edu/~ravel/software/gnuplot-mode.html
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;;; Code:
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(require 'ob)
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(declare-function org-time-string-to-time "org" (s))
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(declare-function org-combine-plists "org" (&rest plists))
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(declare-function orgtbl-to-generic "org-table" (table params))
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(declare-function gnuplot-mode "ext:gnuplot-mode" ())
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(declare-function gnuplot-send-string-to-gnuplot "ext:gnuplot-mode" (str txt))
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(declare-function gnuplot-send-buffer-to-gnuplot "ext:gnuplot-mode" ())
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(defvar org-babel-default-header-args:gnuplot
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'((:results . "file") (:exports . "results") (:session . nil))
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"Default arguments to use when evaluating a gnuplot source block.")
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(defvar org-babel-header-args:gnuplot
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'((title . :any)
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(lines . :any)
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(sets . :any)
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(x-labels . :any)
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(y-labels . :any)
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(timefmt . :any)
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(time-ind . :any)
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(missing . :any)
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(term . :any))
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"Gnuplot specific header args.")
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(defvar org-babel-gnuplot-timestamp-fmt nil) ; Dynamically scoped.
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(defvar *org-babel-gnuplot-missing* nil)
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(defcustom *org-babel-gnuplot-terms*
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'((eps . "postscript eps"))
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"List of file extensions and the associated gnuplot terminal."
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:group 'org-babel
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:type '(repeat (cons (symbol :tag "File extension")
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(string :tag "Gnuplot terminal"))))
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(defun org-babel-gnuplot-process-vars (params)
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"Extract variables from PARAMS and process the variables.
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Dumps all vectors into files and returns an association list
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of variable names and the related value to be used in the gnuplot
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code."
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(let ((*org-babel-gnuplot-missing* (cdr (assq :missing params))))
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(mapcar
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(lambda (pair)
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(cons
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(car pair) ;; variable name
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(let* ((val (cdr pair)) ;; variable value
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(lp (listp val)))
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(if lp
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(org-babel-gnuplot-table-to-data
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(let* ((first (car val))
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(tablep (or (listp first) (symbolp first))))
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(if tablep val (mapcar 'list val)))
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(org-babel-temp-file "gnuplot-") params)
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val))))
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(org-babel--get-vars params))))
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(defun org-babel-expand-body:gnuplot (body params)
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"Expand BODY according to PARAMS, return the expanded body."
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(save-window-excursion
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(let* ((vars (org-babel-gnuplot-process-vars params))
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(out-file (cdr (assq :file params)))
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(prologue (cdr (assq :prologue params)))
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(epilogue (cdr (assq :epilogue params)))
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(term (or (cdr (assq :term params))
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(when out-file
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(let ((ext (file-name-extension out-file)))
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(or (cdr (assoc (intern (downcase ext))
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*org-babel-gnuplot-terms*))
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ext)))))
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(title (cdr (assq :title params)))
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(lines (cdr (assq :line params)))
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(sets (cdr (assq :set params)))
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(x-labels (cdr (assq :xlabels params)))
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(y-labels (cdr (assq :ylabels params)))
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(timefmt (cdr (assq :timefmt params)))
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(time-ind (or (cdr (assq :timeind params))
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(when timefmt 1)))
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(directory (and (buffer-file-name)
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(file-name-directory (buffer-file-name))))
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(add-to-body (lambda (text) (setq body (concat text "\n" body)))))
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;; append header argument settings to body
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(when title (funcall add-to-body (format "set title '%s'" title)))
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(when lines (mapc (lambda (el) (funcall add-to-body el)) lines))
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(when sets
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(mapc (lambda (el) (funcall add-to-body (format "set %s" el))) sets))
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(when x-labels
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(funcall add-to-body
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(format "set xtics (%s)"
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(mapconcat (lambda (pair)
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(format "\"%s\" %d"
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(cdr pair) (car pair)))
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x-labels ", "))))
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(when y-labels
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(funcall add-to-body
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(format "set ytics (%s)"
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(mapconcat (lambda (pair)
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(format "\"%s\" %d"
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(cdr pair) (car pair)))
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y-labels ", "))))
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(when time-ind
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(funcall add-to-body "set xdata time")
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(funcall add-to-body (concat "set timefmt \""
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(or timefmt
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"%Y-%m-%d-%H:%M:%S") "\"")))
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(when out-file
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;; set the terminal at the top of the block
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(funcall add-to-body (format "set output \"%s\"" out-file))
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;; and close the terminal at the bottom of the block
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(setq body (concat body "\nset output\n")))
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(when term (funcall add-to-body (format "set term %s" term)))
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;; insert variables into code body: this should happen last
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;; placing the variables at the *top* of the code in case their
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;; values are used later
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(funcall add-to-body
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(mapconcat #'identity
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(org-babel-variable-assignments:gnuplot params)
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"\n"))
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;; replace any variable names preceded by '$' with the actual
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;; value of the variable
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(mapc (lambda (pair)
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(setq body (replace-regexp-in-string
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(format "\\$%s" (car pair)) (cdr pair) body)))
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vars)
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(when prologue (funcall add-to-body prologue))
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(when epilogue (setq body (concat body "\n" epilogue)))
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;; Setting the directory needs to be done first so that
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;; subsequent 'output' directive goes to the right place.
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(when directory (funcall add-to-body (format "cd '%s'" directory))))
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body))
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(defun org-babel-execute:gnuplot (body params)
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"Execute a block of Gnuplot code.
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This function is called by `org-babel-execute-src-block'."
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(require 'gnuplot)
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(let ((session (cdr (assq :session params)))
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(result-type (cdr (assq :results params)))
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(body (org-babel-expand-body:gnuplot body params))
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output)
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(save-window-excursion
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;; evaluate the code body with gnuplot
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(if (string= session "none")
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(let ((script-file (org-babel-temp-file "gnuplot-script-")))
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(with-temp-file script-file
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(insert (concat body "\n")))
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(message "gnuplot \"%s\"" script-file)
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(setq output
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(shell-command-to-string
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(format
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"gnuplot \"%s\""
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(org-babel-process-file-name
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script-file
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(if (member system-type '(cygwin windows-nt ms-dos))
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t nil)))))
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(message "%s" output))
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(with-temp-buffer
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(insert (concat body "\n"))
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(gnuplot-mode)
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(gnuplot-send-buffer-to-gnuplot)))
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(if (member "output" (split-string result-type))
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output
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nil)))) ;; signal that output has already been written to file
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(defun org-babel-prep-session:gnuplot (session params)
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"Prepare SESSION according to the header arguments in PARAMS."
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(let* ((session (org-babel-gnuplot-initiate-session session))
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(var-lines (org-babel-variable-assignments:gnuplot params)))
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(message "%S" session)
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(org-babel-comint-in-buffer session
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(dolist (var-line var-lines)
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(insert var-line)
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(comint-send-input nil t)
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(org-babel-comint-wait-for-output session)
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(sit-for .1)
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(goto-char (point-max))))
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session))
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(defun org-babel-load-session:gnuplot (session body params)
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"Load BODY into SESSION."
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(save-window-excursion
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(let ((buffer (org-babel-prep-session:gnuplot session params)))
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(with-current-buffer buffer
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(goto-char (process-mark (get-buffer-process (current-buffer))))
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(insert (org-babel-chomp body)))
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buffer)))
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(defun org-babel-variable-assignments:gnuplot (params)
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"Return list of gnuplot statements assigning the block's variables."
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(mapcar
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(lambda (pair) (format "%s = \"%s\"" (car pair) (cdr pair)))
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(org-babel-gnuplot-process-vars params)))
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(defvar gnuplot-buffer)
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(defun org-babel-gnuplot-initiate-session (&optional session _params)
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"Initiate a gnuplot session.
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If there is not a current inferior-process-buffer in SESSION
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then create one. Return the initialized session. The current
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`gnuplot-mode' doesn't provide support for multiple sessions."
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(require 'gnuplot)
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(unless (string= session "none")
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(save-window-excursion
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(gnuplot-send-string-to-gnuplot "" "line")
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gnuplot-buffer)))
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(defun org-babel-gnuplot-quote-timestamp-field (s)
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"Convert S from timestamp to Unix time and export to gnuplot."
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(format-time-string org-babel-gnuplot-timestamp-fmt
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(org-time-string-to-time s)))
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(defvar org-table-number-regexp)
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(defvar org-ts-regexp3)
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(defun org-babel-gnuplot-quote-tsv-field (s)
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"Quote S for export to gnuplot."
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(unless (stringp s)
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(setq s (format "%s" s)))
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(if (string-match org-table-number-regexp s) s
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(if (string-match org-ts-regexp3 s)
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(org-babel-gnuplot-quote-timestamp-field s)
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(if (zerop (length s))
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(or *org-babel-gnuplot-missing* s)
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(if (string-match "[ \"]" s)
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(concat "\"" (mapconcat 'identity (split-string s "\"") "\"\"")
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"\"")
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s)))))
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(defun org-babel-gnuplot-table-to-data (table data-file params)
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"Export TABLE to DATA-FILE in a format readable by gnuplot.
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Pass PARAMS through to `orgtbl-to-generic' when exporting TABLE."
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(with-temp-file data-file
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(insert (let ((org-babel-gnuplot-timestamp-fmt
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(or (plist-get params :timefmt) "%Y-%m-%d-%H:%M:%S")))
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(orgtbl-to-generic
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table
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(org-combine-plists
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'(:sep "\t" :fmt org-babel-gnuplot-quote-tsv-field)
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params)))))
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data-file)
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(provide 'ob-gnuplot)
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;;; ob-gnuplot.el ends here
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