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ob-pbm.el
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ob-pbm.el
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;;; ob-pbm.el --- org-babel functions for pbm evaluation
;; Copyright (C) 2018 Shinsetsu.
;; Author: Erik Post
;; Keywords: literate programming, reproducible research, NetPBM, graphics
;; Homepage: http://orgmode.org
;; 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:
;; Usage: (require 'ob-pbm)
;;
;; This code currently relies on the presence or the ImageMagick 'convert'
;; shell command.
;;
;; This code was adapted from ob-dot.el
;;; Code:
(require 'ob)
(defvar org-babel-default-header-args:pbm
'((:results . "file") (:exports . "results"))
"Default arguments to use when evaluating a pbm source block.")
(defun org-babel-expand-body:pbm (body params)
"Expand BODY according to PARAMS, return the expanded body."
(let ((vars (org-babel--get-vars params)))
(mapc
(lambda (pair)
(let ((name (symbol-name (car pair)))
(value (cdr pair)))
(setq body
(replace-regexp-in-string
(concat "$" (regexp-quote name))
(if (stringp value) value (format "%S" value))
body
t
t))))
vars)
body))
(defun org-babel-execute:pbm (body params)
"Execute a block of Pbm code with org-babel.
This function is called by `org-babel-execute-src-block'."
(let* ((result-params (cdr (assoc :result-params params)))
(out-file (cdr (or (assoc :file params)
(error "You need to specify a :file parameter"))))
(widthOrNil (cdr (assoc :width params)))
(width (if widthOrNil (number-to-string widthOrNil) ""))
(heightOrNil (cdr (assoc :height params)))
(height (if heightOrNil (number-to-string heightOrNil) ""))
(scale (if (or widthOrNil heightOrNil) (concat "-scale " width "x" height) ""))
(cmdline (or (cdr (assoc :cmdline params))))
(cmd (or (cdr (assoc :cmd params)) "convert"))
(in-file (org-babel-temp-file "pbm-")))
(with-temp-file in-file
(insert (org-babel-expand-body:pbm body params)))
(org-babel-eval
(concat cmd
" -negate"
" " scale
;; " -fill 'rgb(80,80,80)' -opaque white"
" " cmdline
" " (org-babel-process-file-name in-file)
" " (org-babel-process-file-name out-file)) "")
nil)) ;; signal that output has already been written to file
(defun org-babel-prep-session:pbm (session params)
"Return an error because PBM does not support sessions."
(error "PBM does not support sessions"))
(provide 'ob-pbm)
;; : convert -scale 600 -negate -fill 'rgb(80,80,80)' -opaque white sprite-ship.P1.pbm sprite-ship.P1.png
;;
;; [[./examples/sprite-ship.P1.png]]