;;; ob-calc.el --- Babel Functions for Calc -*- lexical-binding: t; -*-
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;; Copyright (C) 2010-2018 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 calc code
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;;; Code:
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(require 'ob)
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(require 'calc)
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(require 'calc-trail)
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(require 'calc-store)
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(declare-function calc-store-into "calc-store" (&optional var))
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(declare-function calc-recall "calc-store" (&optional var))
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(declare-function math-evaluate-expr "calc-ext" (x))
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(declare-function org-trim "org" (s &optional keep-lead))
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(defvar org-babel-default-header-args:calc nil
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"Default arguments for evaluating a calc source block.")
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(defun org-babel-expand-body:calc (body _params)
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"Expand BODY according to PARAMS, return the expanded body." body)
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(defvar org--var-syms) ; Dynamically scoped from org-babel-execute:calc
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(defun org-babel-execute:calc (body params)
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"Execute a block of calc code with Babel."
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(unless (get-buffer "*Calculator*")
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(save-window-excursion (calc) (calc-quit)))
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(let* ((vars (org-babel--get-vars params))
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(org--var-syms (mapcar #'car vars))
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(var-names (mapcar #'symbol-name org--var-syms)))
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(mapc
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(lambda (pair)
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(calc-push-list (list (cdr pair)))
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(calc-store-into (car pair)))
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vars)
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(mapc
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(lambda (line)
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(when (> (length line) 0)
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(cond
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;; simple variable name
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((member line var-names) (calc-recall (intern line)))
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;; stack operation
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((string= "'" (substring line 0 1))
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(funcall (lookup-key calc-mode-map (substring line 1)) nil))
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;; complex expression
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(t
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(calc-push-list
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(list (let ((res (calc-eval line)))
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(cond
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((numberp res) res)
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((math-read-number res) (math-read-number res))
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((listp res) (error "Calc error \"%s\" on input \"%s\""
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(cadr res) line))
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(t (replace-regexp-in-string
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"'" ""
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(calc-eval
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(math-evaluate-expr
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;; resolve user variables, calc built in
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;; variables are handled automatically
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;; upstream by calc
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(mapcar #'org-babel-calc-maybe-resolve-var
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;; parse line into calc objects
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(car (math-read-exprs line)))))))))
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))))))
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(mapcar #'org-trim
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(split-string (org-babel-expand-body:calc body params) "[\n\r]"))))
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(save-excursion
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(with-current-buffer (get-buffer "*Calculator*")
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(prog1
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(calc-eval (calc-top 1))
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(calc-pop 1)))))
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(defun org-babel-calc-maybe-resolve-var (el)
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(if (consp el)
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(if (and (eq 'var (car el)) (member (cadr el) org--var-syms))
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(progn
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(calc-recall (cadr el))
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(prog1 (calc-top 1)
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(calc-pop 1)))
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(mapcar #'org-babel-calc-maybe-resolve-var el))
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el))
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(provide 'ob-calc)
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;;; ob-calc.el ends here
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