org-mode/contrib/babel/lisp/langs/org-babel-perl.el

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;;; org-babel-perl.el --- org-babel functions for perl evaluation
;; Copyright (C) 2009 Dan Davison, Eric Schulte
;; Author: Dan Davison, Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; Version: 0.01
;;; License:
;; This program 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, or (at your option)
;; any later version.
;;
;; This program 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; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; Org-Babel support for evaluating perl source code.
;;; Code:
(require 'org-babel)
(org-babel-add-interpreter "perl")
(add-to-list 'org-babel-tangle-langs '("perl" "pl" "#!/usr/bin/env perl"))
(defun org-babel-execute:perl (body params)
"Execute a block of Perl code with org-babel. This function is
called by `org-babel-execute-src-block'."
(message "executing Perl source code block")
(let* ((processed-params (org-babel-process-params params))
(session (first processed-params))
(vars (second processed-params))
(result-params (third processed-params))
(result-type (fourth processed-params))
(full-body (concat
(mapconcat ;; define any variables
(lambda (pair)
(format "$%s=%s;"
(car pair)
(org-babel-perl-var-to-perl (cdr pair))))
vars "\n") "\n" (org-babel-trim body) "\n")) ;; then the source block body
(session (org-babel-perl-initiate-session session)))
(org-babel-perl-evaluate session full-body result-type)))
(defun org-babel-prep-session:perl (session params)
"Prepare SESSION according to the header arguments specified in PARAMS."
(error "Sessions are not supported for Perl."))
;; helper functions
(defun org-babel-perl-var-to-perl (var)
"Convert an elisp var into a string of perl source code
specifying a var of the same value."
(if (listp var)
(concat "[" (mapconcat #'org-babel-perl-var-to-perl var ", ") "]")
(format "%S" var)))
(defvar org-babel-perl-buffers '(:default . nil))
(defun org-babel-perl-initiate-session (&optional session)
"Simply return nil, as sessions are not supported by perl"
nil)
(defvar org-babel-perl-wrapper-method
"
sub main {
%s
}
@r = main;
open(o, \">%s\");
print o join(\"\\n\", @r), \"\\n\"")
(defvar org-babel-perl-pp-wrapper-method
nil)
(defun org-babel-perl-evaluate (session body &optional result-type)
"Pass BODY to the Perl process in SESSION. If RESULT-TYPE equals
'output then return a list of the outputs of the statements in
BODY, if RESULT-TYPE equals 'value then return the value of the
last statement in BODY, as elisp."
(if (not session)
;; external process evaluation
(save-window-excursion
(case result-type
(output
(with-temp-buffer
(insert body)
;; (message "buffer=%s" (buffer-string)) ;; debugging
(shell-command-on-region (point-min) (point-max) "perl" 'replace)
(buffer-string)))
(value
(let ((tmp-file (make-temp-file "perl-functional-results")))
(with-temp-buffer
(insert
(format
(if (member "pp" result-params)
(error "Pretty-printing not implemented for perl")
org-babel-perl-wrapper-method)
(mapconcat
(lambda (line) (format "\t%s" line))
(split-string
(org-remove-indentation (org-babel-trim body)) "[\r\n]") "\n")
tmp-file))
;; (message "buffer=%s" (buffer-string)) ;; debugging
(shell-command-on-region (point-min) (point-max) "perl"))
(let ((raw (with-temp-buffer (insert-file-contents tmp-file) (buffer-string))))
(if (or (member "code" result-params) (member "pp" result-params))
raw
(org-babel-import-elisp-from-file tmp-file)))))))
;; comint session evaluation
(error "Sessions are not supported for Perl.")))
(provide 'org-babel-perl)
;;; org-babel-perl.el ends here