Re: [babel][PATCH] org-babel-asymptote now handles variables.

["Eric Schulte" <schulte.eric@gmail.com>]

Hi Nicolas,

This patch looks great!  Thanks for the contribution.  However before I
apply this patch, can I ask, have you signed the FSF papers.

As org-babel is being incorporated into the core of Org-mode and will be
considered part of Emacs we need authors of any contributions longer
than 10 lines to sign the FSF papers.

http://orgmode.org/worg/org-contribute.php

Thanks -- Eric

Nicolas Goaziou <n.goaziou@gmail.com> writes:

> Hello,
>
> Here is a patch to allow the use of variables in org-babel-asymptote.
> Types integer, string, symbol (treated as string) float and any table
> of those are recognized.
>
> Thanks,
>
> - Nicolas
>
> diff --git a/contrib/babel/lisp/langs/org-babel-asymptote.el b/contrib/babel/lisp/langs/org-babel-asymptote.el
> index 59ca291..eed1a87 100644
> --- a/contrib/babel/lisp/langs/org-babel-asymptote.el
> +++ b/contrib/babel/lisp/langs/org-babel-asymptote.el
> @@ -37,8 +37,6 @@
>  ;; 3) we are adding the "file" and "cmdline" header arguments, if file
>  ;;    is omitted then the -V option is passed to the asy command for
>  ;;    interactive viewing
> -;;
> -;; 4) there are no variables (at least for now)
>  
>  ;;; Requirements:
>  
> @@ -56,13 +54,17 @@
>  (defvar org-babel-default-header-args:asymptote '((:results . "file") (:exports . "results"))
>    "Default arguments to use when evaluating a asymptote source block.")
>  
> -(defun org-babel-expand-body:asymptote (body params &optional processed-params) body)
> +(defun org-babel-expand-body:asymptote (body params &optional processed-params)
> +  (let ((vars (second (or processed-params
> +                          (org-babel-process-params params)))))
> +    (concat (mapconcat 'org-babel-asymptote-var-to-asymptote vars "\n") "\n" body "\n")))
>  
>  (defun org-babel-execute:asymptote (body params)
>    "Execute a block of Asymptote code with org-babel.  This function is
>  called by `org-babel-execute-src-block'."
>    (message "executing Asymptote source code block")
> -  (let* ((result-params (split-string (or (cdr (assoc :results params)) "")))
> +  (let* ((processed-params (org-babel-process-params params))
> +         (result-params (split-string (or (cdr (assoc :results params)) "")))
>           (out-file (cdr (assoc :file params)))
>           (format (or (and out-file
>                            (string-match ".+\\.\\(.+\\)" out-file)
> @@ -75,12 +77,76 @@ called by `org-babel-execute-src-block'."
>                            (concat "-globalwrite -f " format " -o " out-file)
>                          "-V")
>                        " " cmdline " " in-file)))
> -    (with-temp-file in-file (insert body))
> +    (with-temp-file in-file (insert (org-babel-expand-body:asymptote body params processed-params)))
>      (message cmd) (shell-command cmd)
>      out-file))
>  
>  (defun org-babel-prep-session:asymptote (session params)
>    (error "Asymptote does not support sessions"))
>  
> +(defun org-babel-asymptote-var-to-asymptote (pair)
> +  "Convert an elisp val into a string of asymptote code specifying a var
> +of the same value."
> +  (let ((var (car pair))
> +        (val (if (symbolp (cdr pair))
> +                 (symbol-name (cdr pair))
> +               (cdr pair))))
> +    (cond
> +     ((integerp val)
> +      (format "int %S=%S;" var val))
> +     ((floatp val)
> +      (format "real %S=%S;" var val))
> +     ((stringp val)
> +      (format "string %S=\"%s\";" var val))
> +     ((listp val)
> +      (let* ((dimension-2-p (not (null (cdr val))))
> +             (dim (if dimension-2-p "[][]" "[]"))
> +             (type (org-babel-asymptote-define-type val))
> +             (array (org-babel-asymptote-table-to-array
> +                     val
> +                     (if dimension-2-p '(:lstart "{" :lend "}," :llend "}")))))
> +        (format "%S%s %S=%s;" type dim var array))))))
> +
> +(defun org-babel-asymptote-table-to-array (table params)
> +  "Convert values of an elisp table into a string of an asymptote array.
> +Empty cells are ignored."
> +  (labels ((atom-to-string (table)
> +                           (cond
> +                            ((null table) '())
> +                            ((not (listp (car table)))
> +                             (cons (if (and (stringp (car table))
> +                                            (not (string= (car table) "")))
> +                                       (format "\"%s\"" (car table))
> +                                     (format "%s" (car table)))
> +                                   (atom-to-string (cdr table))))
> +                            (t
> +                             (cons (atom-to-string (car table))
> +                                   (atom-to-string (cdr table))))))
> +           ;; Remove any empty row
> +           (fix-empty-lines (table)
> +                            (delq nil (mapcar (lambda (l) (delq "" l)) table))))
> +    (orgtbl-to-generic
> +     (fix-empty-lines (atom-to-string table))
> +     (org-combine-plists '(:hline nil :sep "," :tstart "{" :tend "}") params))))
> +
> +(defun org-babel-asymptote-define-type (data)
> +  "Determine type of DATA. DATA is a list.
> +Type symbol is returned as 'symbol. The type is usually the type
> +of the first atom encountered, except for arrays of int where
> +every cell must be of int type."
> +  (labels ((anything-but-int (el)
> +                             (cond
> +                              ((null el) nil)
> +                              ((not (listp (car el)))
> +                               (cond
> +                                ((floatp (car el)) 'real)
> +                                ((stringp (car el)) 'string)
> +                                (t
> +                                 (anything-but-int (cdr el)))))
> +                              (t
> +                               (or (anything-but-int (car el))
> +                                   (anything-but-int (cdr el)))))))
> +    (or (anything-but-int data) 'int)))
> +
>  (provide 'org-babel-asymptote)
>  ;;; org-babel-asymptote.el ends here
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