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