208 lines
6.5 KiB
EmacsLisp
208 lines
6.5 KiB
EmacsLisp
;;; ob-metapost.el --- org-babel functions for metapost evaluation
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;; Copyright (C) 2009-2012 Free Software Foundation, Inc.
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;; Author: Rongsong Shen
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;; Keywords: literate programming, metapost
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;; Homepage: http://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 <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Org-Babel support for evaluating metapost 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) there is no such thing as a "session" in metapost
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;;
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;; 2) we are generally only going to return results of type "file"
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;;
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;; 3) we are adding the "file" and "cmdline" header arguments, if file
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;; is omitted then the -V option is passed to the metapost command for
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;; interactive viewing
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;;; Requirements:
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;;
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;; - metapost-mode :: Major mode for editing metapost files
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;;; Code:
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(require 'ob)
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(eval-when-compile (require 'cl))
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(defvar org-babel-default-header-args:metapost
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'((:results . "file") (:exports . "results"))
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"Default arguments when evaluating an Metapost source block.")
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(defcustom org-metapost-program "mpost"
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"Command of metapost. The command should use command line `mpost sourcefile'"
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:group 'org-babel
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:version "24.1"
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:type 'string)
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(defcustom org-metapost-convert "convert"
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"Command for convert picture format. The command should use format `convert source destintion'"
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:group 'org-babel
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:version "24.1"
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:type 'string)
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(defvar mp-prologues)
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(defvar mp-script)
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(defvar mp-m-end)
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(defvar mp-m-start)
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(defvar mp-var-type)
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(defvar mp-var-value)
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(defvar mp-vpair)
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(defun metapost-shell-command (dir cmd)
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(shell-command (concat "/bin/sh -c \" cd "
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dir ";"
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cmd "\"")))
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(defun metapost-fold (acc fun lst)
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(if lst
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(metapost-fold (funcall fun acc (car lst))
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fun (cdr lst))
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acc))
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(defun metapost-script (fmt mp-libs body)
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(setq mp-prologues
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(cond ((string= fmt "svg") "outputformat:=\"svg\";\n")
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(t "prologues:=3;\n")))
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(setq mp-script (concat "beginfig(1);\n"
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body
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"\nendfig;\n"
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"end\n"))
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(message "%s" mp-script)
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(concat mp-prologues
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(if mp-libs
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(metapost-fold "" #'(lambda (a b)
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(concat a "input " b ";\n"))
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(split-string mp-libs ","))
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"")
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mp-script))
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(defun metapost-post-run (fmt in-file out-file)
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(cond ((or (string= fmt "svg")
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(string= fmt "eps"))
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(copy-file (concat (file-name-nondirectory in-file) ".1")
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out-file))
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(t (metapost-shell-command org-babel-temporary-directory
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(concat org-metapost-convert " "
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(file-name-nondirectory in-file)
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".1" " "
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out-file)))))
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;;;###autoload
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(defun org-babel-execute:metapost (body params)
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"Execute a block of Metapost code.
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This function is called by `org-babel-execute-src-block'."
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(let* ((result-params (split-string (or (cdr (assoc :results params)) "")))
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(out-file (expand-file-name (cdr (assoc :file params))))
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(format (or (and out-file
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(string-match ".+\\.\\(.+\\)" out-file)
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(match-string 1 out-file))
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"pdf"))
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(cmdline (cdr (assoc :cmdline params)))
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(in-file (org-babel-temp-file "metapost-"))
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(cmd (concat org-metapost-program " --debug "
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(file-name-nondirectory
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(org-babel-process-file-name in-file)))))
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(with-temp-file in-file
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(insert (metapost-script format
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(cdr (assoc :mp-libs params))
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(org-babel-expand-body:generic
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body params
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(org-babel-variable-assignments:metapost params)))))
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(metapost-shell-command org-babel-temporary-directory
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cmd)
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(metapost-post-run format in-file out-file)
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nil)) ;; signal that output has already been written to file
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;;;###autoload
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(defun org-babel-prep-session:metapost (session params)
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"Return an error if the :session header argument is set.
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Metapost does not support sessions"
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(error "Metapost does not support sessions"))
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;;;###autoload
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(defun org-babel-variable-assignments:metapost (params)
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"Return list of metapost statements assigning the block's variables"
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(mapcar #'org-babel-metapost-var-to-metapost
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(org-babel-get-vars params)))
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(defconst metapost-type-prefix "^[^:]*:")
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(defun org-babel-metapost-var-value (val)
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(setq mp-m-end 0)
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(setq mp-m-start (string-match metapost-type-prefix val))
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(if mp-m-start
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(setq mp-m-end (match-end 0)))
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(setq mp-var-type "")
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(setq mp-var-value val)
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(if (> mp-m-end 0)
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(progn (setq mp-var-type
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(substring val mp-m-start (- mp-m-end 1)))
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(setq mp-var-value
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(substring val mp-m-end (length val)))))
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(cons mp-var-type (cons mp-var-value nil)))
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(defun org-babel-metapost-var-to-metapost (pair)
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"Convert an elisp value into an Metapost variable.
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The elisp value PAIR is converted into Metapost code specifying
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a variable of the same value."
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(let ((var (car pair))
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(val (let ((v (cdr pair)))
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(if (symbolp v) (symbol-name v) v))))
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(progn
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(setq mp-vpair (org-babel-metapost-var-value val))
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(setq mp-var-type (nth 0 mp-vpair))
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(setq mp-var-value (nth 1 mp-vpair))
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(if (string= mp-var-type "string")
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(format "%s %s;\n %s :=\"%s\";\n"
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mp-var-type var var mp-var-value
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)
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(format "%s %s;\n %s := %s;\n"
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mp-var-type var var mp-var-value
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)))))
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(defun org-babel-metapost-define-type (data)
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"Determine type of DATA.
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DATA is a list. Return type as a symbol.
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The type is `string' if any element in DATA is
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a string. Otherwise, it is either `numeric', if some elements are
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floats, or `numeric'."
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(let* ((type 'numeric)
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find-type ; for byte-compiler
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(find-type
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(function
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(lambda (row)
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(catch 'exit
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(mapc (lambda (el)
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(cond ((listp el) (funcall find-type el))
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((stringp el) (throw 'exit (setq type 'string)))
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((floatp el) (setq type 'numeric))))
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row))))))
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(funcall find-type data) type))
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(provide 'ob-metapost)
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;;; ob-metapost.el ends here
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